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Articles 331 - 360 of 367
Full-Text Articles in Ocean Engineering
Fuzzy-Sliding-Mode-Based Robust Tracking Control Of Autonomous Underwater Vehicles, Qiaomei Sun, Jinguo Chen, Wan Yu, Huashan Su
Fuzzy-Sliding-Mode-Based Robust Tracking Control Of Autonomous Underwater Vehicles, Qiaomei Sun, Jinguo Chen, Wan Yu, Huashan Su
Journal of Marine Science and Technology–Taiwan
Control of an autonomous underwater vehicle (AUV) is difficult due to its nonlinear and coupled characteristics, parameter uncertainties, and unknown disturbances. This paper presents a motion control system based on an adaptive fuzzy sliding mode control (FSMC) method for trajectory tracking of an AUV. The proposed FSMC method is primarily based on a combination of sliding mode control (SMC) strategy with an adaptive fuzzy algorithm to estimate external disturbances and weaken the chattering effect. A waypoint guidance law based on a line-of-sight (LOS) algorithm is applied to the guidance system. Simulation studies confirm a good performance of the proposed controller. …
Fft Phase Shift Of Water Wave Analysis, Chu-Kuan Lin, Shih-Yu Hsu, Jaw-Guei Lin
Fft Phase Shift Of Water Wave Analysis, Chu-Kuan Lin, Shih-Yu Hsu, Jaw-Guei Lin
Journal of Marine Science and Technology–Taiwan
The fast Fourier transform (FFT) has been accepted as a tool for signal processing. This study conducted a series of numerical experiments using Matlab. By conducting FFT analysis on designated wave trains, the FFT results revealed that an extra phase shift of ��ሺ2�� ��⁄ ሻ , with N representing the number of data points for an i-th wave component, was implicitly added to the analyzed phases during the analysis. When extra phase shifts were subtracted from the analyzed phases of each component, signals could be completely reconstructed in the time domain with an acceptable difference. This study tested component and …
Protective Effect Of An Ice-Breaking Structure On Offshore Structures In Shallow Waters, Ji-Wu Dong, Zhi-Jun Li, Xiang-Peng Kong, Xiao-Dong Liang
Protective Effect Of An Ice-Breaking Structure On Offshore Structures In Shallow Waters, Ji-Wu Dong, Zhi-Jun Li, Xiang-Peng Kong, Xiao-Dong Liang
Journal of Marine Science and Technology–Taiwan
In this study, an ice-breaking structure (IBS) was designed to break large ice floes into small fragments through flexural failure predominantly for protecting offshore structures in shallow waters. The protective effect of the IBS on a vertical isolated cylindrical pile (ICP), which was examined through the model tests of the crushing ice loads and collision forces on the ICP from ice pieces broken with the IBS under identical conditions, was evaluated by obtaining the relative difference between the maximum values of the horizontal crushing forces and collision loads on the ICP. The results indicated a notable protective effect of the …
The Effect Of Hydro-Meteorology On Ship Collision Avoidance In Heavy Traffic Areas With A Simplified Simulation Model, Ming-Chung Fang, Kun-Yuan Tsai, Chih-Chung Fang
The Effect Of Hydro-Meteorology On Ship Collision Avoidance In Heavy Traffic Areas With A Simplified Simulation Model, Ming-Chung Fang, Kun-Yuan Tsai, Chih-Chung Fang
Journal of Marine Science and Technology–Taiwan
On the basis of the ship collision avoidance steering system in calm water developed by the authors, this paper upgrades the numerical simulation model by considering various hydrometeorological factors for ships with nonuniform movement. A real-time simulator was used for the numerical simulation of the container ship. To clarify the validity of the maneuvering mathematical model, sea trial results for the container ship were compared with the results for the present simulation system in terms of turn trajectory. In this study, a numerical technique based on Nomoto’s second-order model was employed to investigate the turning characteristics of a container ship. …
Identifying Nonlinear Oscillators By An Energetic Functional In The Linear Space Of Temporal Boundary Functions, Chein-Shan Liu, Yung-Wei Chen, Jiang-Ren Chang
Identifying Nonlinear Oscillators By An Energetic Functional In The Linear Space Of Temporal Boundary Functions, Chein-Shan Liu, Yung-Wei Chen, Jiang-Ren Chang
Journal of Marine Science and Technology–Taiwan
We resolve the inverse problems of a second-order nonlinear oscillator to recover time-dependent damping function and nonlinear restoring force, with the help of temporal boundary data measured at initial time and final time. By using these data, a sequence of temporal boundary functions of time is derived, which satisfy the measured temporal boundary conditions automatically, and are at least the fourth-order polynomials of time. All the temporal boundary functions and zero element constitute a linear space, and a new concept of energetic functional is introduced in the linear space, of which the energy is preserved for each energetic temporal boundary …
Experimental Study Of Scour Around Monopile And Jacket-Type Offshore Wind Turbine Foundations, Hsin-Hung Chen
Experimental Study Of Scour Around Monopile And Jacket-Type Offshore Wind Turbine Foundations, Hsin-Hung Chen
Journal of Marine Science and Technology–Taiwan
Wind turbines platforms and pillars on offshore wind farms are negatively affected by wave and current action. In Taiwan, the water depth of most planned wind turbine foundations is more than 15 m. At this water depth, scour around offshore wind turbine foundations is mainly subject to the ocean current, which causes damage or collapse of foundations. Therefore, this study focused on the influence of ocean current on the monopile and jacket-type foundations of offshore wind turbines. Hydraulic model experiments were conducted to investigate the maximum scour depth and range around pillars in these foundations. Under the effects of current, …
Oblique Wave Scattering By A Submerged Porous Breakwater With A Partially Reflecting Sidewall, Yang Zhao, Hua-Jun Li, Yong Liu
Oblique Wave Scattering By A Submerged Porous Breakwater With A Partially Reflecting Sidewall, Yang Zhao, Hua-Jun Li, Yong Liu
Journal of Marine Science and Technology–Taiwan
This study develops an analytical solution for oblique wave scattering by a submerged porous breakwater with a leeside partially reflecting vertical wall. The matched eigenfunction expansion method is used to develop the analytical solution. The whole fluid domain is divided into three regions according to the geometries of the structures. The series solution of the velocity potential in each region is obtained by the separation of the variables, and the unknown expansion coefficients are determined using the pressure and velocity continuous conditions on interfaces of different regions. The newly developed analytical solution is confirmed by an independently developed multi-domain boundary …
Feasibility Assessment Of Substituting Stainless Steel With Aluminum Alloy For Hydraulic Gate, Kuo-Ho Chen, Tien-Kuen Huang
Feasibility Assessment Of Substituting Stainless Steel With Aluminum Alloy For Hydraulic Gate, Kuo-Ho Chen, Tien-Kuen Huang
Journal of Marine Science and Technology–Taiwan
In this paper, the feasibility of using aluminum alloy 5083 as a replacement for currently used stainless steel SUS 304L on hydraulic gate is evaluated. Relevant properties of these two materials are compared for use in hydraulic gates. Forty common types of hydraulic gates were analyzed through the finite element program PLAXIS 3D Foundation. It shows the weight for most types of hydraulic gates with aluminum alloy 5083 is in the range of 37.6-45.9% of that of stainless steel SUS 304L. At the same time, the cost of gate manufacturing is reduced 39.6-50.5% and cost of maintanence/operation can be reduced …
Improved Analysis Of Bolted Shear Connection Under Eccentric Loads, Dung-Myau Lue, Cheng-Yen Liao, Chien-Chien Chang, Wei-Ting Hsu
Improved Analysis Of Bolted Shear Connection Under Eccentric Loads, Dung-Myau Lue, Cheng-Yen Liao, Chien-Chien Chang, Wei-Ting Hsu
Journal of Marine Science and Technology–Taiwan
Almost all bolted connections are eccentrically loaded. The American Institute of Steel Construction (AISC) permits the use of elastic and instantaneous center of rotation (IC) methods to analyze eccentric bolted connections. The elastic method normally yields relatively conservative designs and the IC method, which provides more realistic analyses, is rather complex and tedious. The current AISC manual provides tables for determining coefficient C, which is used to obtain the design strength of bolt group patterns. However, the tables provide values for only six angles of inclination (θ = 0°, 15°, 30°, 45°, 60°, and 75°). For other angles, a direct …
Assessing Fishing Port Locations For Adaption Into Yacht Marinas In Taiwan, Ching-Min Yang, Chi-Chang Lai1, Long-Jing Wu, Jan-Jung Li
Assessing Fishing Port Locations For Adaption Into Yacht Marinas In Taiwan, Ching-Min Yang, Chi-Chang Lai1, Long-Jing Wu, Jan-Jung Li
Journal of Marine Science and Technology–Taiwan
As fishing resources gradually disappear, the original functions of fishing ports change. Modernizing traditional fishing ports is valuable for the fishing industry, tourism, and waterfront development. To determine suitable locations for such ports, an analytic hierarchy process and an interview survey were used to objectively analyze inputs from fishing port managers and yacht users. To establish additional yacht marinas in fishing ports, both groups attached importance to the “support of government and integration of policies” (rank and additive weight of manager : user = 1[0.185] : 2[0.119]). Therefore, inclusion of a complete and appropriate management mechanism must be emphasized during …
Offshore Structural Dynamic Analysis Considering Soil-Structure Interaction By A Coupled Bem And Meshfree Method, Min-Chou Tsai, Hsien Hua Lee, Tinh Quoc Bui, Chuanzeng Zhang
Offshore Structural Dynamic Analysis Considering Soil-Structure Interaction By A Coupled Bem And Meshfree Method, Min-Chou Tsai, Hsien Hua Lee, Tinh Quoc Bui, Chuanzeng Zhang
Journal of Marine Science and Technology–Taiwan
An investigation of dynamic offshore structure considering soil-structure interaction by a coupled approach based on boundary element and meshfree methods is presented. The moving Kriging interpolation is used for generating the shape functions because of possessing the Kronecker delta property, which makes easier in imposing the essential boundary conditions. The governing elastodynamic equations are transformed into a standard weak formulation. It is then discretized into a meshfree system of time-dependent equations, which are solved by the standard implicit Newmark time integration scheme. Numerical examples illustrating the applicability and effectiveness of the proposed method are presented and discussed in details. A …
Geometric Solution In Progressive Collapse Analysis Of Hull Girder, Ertekin Bayraktarkatal, Gökhan Tansel Tayyar
Geometric Solution In Progressive Collapse Analysis Of Hull Girder, Ertekin Bayraktarkatal, Gökhan Tansel Tayyar
Journal of Marine Science and Technology–Taiwan
This paper presents a calculation model for stiffened plates to determine the ultimate strength of ship hull girders from their curvatures using a geometrical approach. The present study employed Smith’s method, in which the cross-section is divided into smaller elements consisting of a stiffener(s) and attached plating. The strength of beam-columns and stiffened plates was obtained using an iterative numerical approach. The deflection curve was evaluated using the curvature values directly instead of by solving differential equations. The deflection curve was taken as an assembly of chains of circular arcs. The ultimate strength of the hull girder of a 1/3 …
Reproducing Laboratory-Scale Rip Currents On A Barred Beach By A Boussinesq Wave Model, Ke-Zhao Fang, Ji-Wei Yin, Zhi-Li Zou, Zhong-Bo Liu, Ping Dong
Reproducing Laboratory-Scale Rip Currents On A Barred Beach By A Boussinesq Wave Model, Ke-Zhao Fang, Ji-Wei Yin, Zhi-Li Zou, Zhong-Bo Liu, Ping Dong
Journal of Marine Science and Technology–Taiwan
The pioneering work of Haller [8] on physically investigating bathymetry-controlled rip currents in the laboratory is a standard benchmark test for verifying numerical nearshore circulation models. In this paper, a numerical model based on higher-order Boussinesq equations was developed to reproduce the number of experiments involved in such an investigation, with emphasis on the effect of computational domain size on the numerical results. A set of Boussinesq equations with optimum linear properties and second-order full nonlinearity were solved using a higher-order finite difference scheme. Wave breaking, moving shoreline, bottom friction, and mixing were all treated empirically. The developed model was …
A Modelling Study Of Seawater Intrusion In The Liao Dong Bay Coastal Plain, China, Fei Ding, Takao Yamashita, Han Soo Lee, Graduate School For International Development And Cooperation, Hiroshima University, Higashi-Hiroshima, Japan Pan
A Modelling Study Of Seawater Intrusion In The Liao Dong Bay Coastal Plain, China, Fei Ding, Takao Yamashita, Han Soo Lee, Graduate School For International Development And Cooperation, Hiroshima University, Higashi-Hiroshima, Japan Pan
Journal of Marine Science and Technology–Taiwan
To investigate the extent of seawater intrusion in the Liao Dong Bay coastal plain, China, a numerical model for variable-density groundwater flow and miscible salt transport was developed. The SEAWAT code was used to solve the density-dependent groundwater flow and solute transport governing equations. The simulation was conducted for 55 months from October, 2004 to April, 2009. The numerical model was calibrated by the hydraulic heads measured in April, 2009. Using the calibrated model and the same hydrogeological conditions in 2004, the extent of seawater intrusion prediction was conducted for the next 40 years. The results show that the extent …
Experimental Study Of Characteristics Of Motions Of A Large Mooring Ship In Long-Period Waves, Xian-Ying Shi, Ning-Chuan Zhang, Chang-Ping Chen, Heng-Zhi Jiang, Lei Cui
Experimental Study Of Characteristics Of Motions Of A Large Mooring Ship In Long-Period Waves, Xian-Ying Shi, Ning-Chuan Zhang, Chang-Ping Chen, Heng-Zhi Jiang, Lei Cui
Journal of Marine Science and Technology–Taiwan
By using the method of physical model tests, the characteristics of mooring ship’s motion responses in transverse long-period waves have been studied under different conditions, including such elements as loading conditions, wave heights, and specific patterns of mooring, etc. The results indicate that: the mooring ship’s movements of surge, sway and yaw had their own natural periods; the movement of sway was a period motion. The ratio of the natural period of sway and the natural rolling period of the mooring ship was within 1.11~1.23. The peak value of sway grew along with the increase of the wave period; the …
Truncated Model Tests For Mooring Lines Of A Semi-Submersible Platform And Its Equivalent Compensated Method, Dong-Sheng Qiao, Jin-Ping Ou
Truncated Model Tests For Mooring Lines Of A Semi-Submersible Platform And Its Equivalent Compensated Method, Dong-Sheng Qiao, Jin-Ping Ou
Journal of Marine Science and Technology–Taiwan
This study conducted a model test of 1:100 model scale of a semi-submersible platform with a 1500 m full-depth mooring system in the Joint Laboratory of Wind Tunnel & Wave Flume at Harbin Institute of Technology. A truncated mooring system of 400 m water depth was designed based on the static equivalent principle. The semi-submersible platform was tested under regular wave excitation periods that ranged from 10 s to 45 s and one year of irregular wave conditions in the South China Sea. The results validated the feasibility of using numerical simulation in the motions calculation of semisubmersible platform and …
Liquefaction Potential Of Non-Plastic Silty Sand, Chun-Chi Chen, Wei F Lee, Jing-Wen Chen, Kenji Ishihara
Liquefaction Potential Of Non-Plastic Silty Sand, Chun-Chi Chen, Wei F Lee, Jing-Wen Chen, Kenji Ishihara
Journal of Marine Science and Technology–Taiwan
This paper is to introduce research progress on liquefaction potential of undisturbed high fines content non-plastic silty sand. A new sampling technique that was applied to the field allowing sensitive and high fines content silty sand material to be retrieved in sounding condition is described. Laboratory tests on the liquefaction resistance of non-plastic silty sand that emphasized on the influence of fines content percentages were conducted. It concludes that soil liquefaction would occur in non-plastic silty sand deposits even with high nonplastic fines contents. Both fines contents and void ratios have deterministic influences to the cyclic resistance of such silty …
Dynamics And Cutting Stability Of Dynamically Loaded Worktable Subjected To Elastic Supports, Kuo-Chiang Cha, Nenzi Wang, Jen-Yi Liao
Dynamics And Cutting Stability Of Dynamically Loaded Worktable Subjected To Elastic Supports, Kuo-Chiang Cha, Nenzi Wang, Jen-Yi Liao
Journal of Marine Science and Technology–Taiwan
This paper investigated the dynamic characteristics and the cutting stability of a dynamically loaded worktable on elastic supports in a surface grinder. The operation of worktables is usually dynamically loaded in various positions, which results in a complex system of governing equations. In this study, the assumptions of elastic and rigid body modes of a free-free beam were specified in analyzing the worktable. By combining the Lagrange energy method with the technique of assumed mode expansion, the system of equations was developed. The absolute value of the maximum negative real part of the overall dynamic compliance (MNRPODC) and the limiting …
The Experimental Study On Local Scour Around A Circular Pipe Undergoing Vortex-Induced Vibration In Steady Flow, Bing Yang, Tao Yang, Jian-Lin Ma, Jin-Sheng Cui
The Experimental Study On Local Scour Around A Circular Pipe Undergoing Vortex-Induced Vibration In Steady Flow, Bing Yang, Tao Yang, Jian-Lin Ma, Jin-Sheng Cui
Journal of Marine Science and Technology–Taiwan
The local scour around a circular pipe undergoing vortexinduced vibration is investigated experimentally in a water flume. The typical characteristic of local scour is analyzed in detail. The influences of initial gap-to-diameter ratio (e0/D), the mode of pipe vibration and the sand type on the local scour are discussed. Experimental results indicate that there exists strong intensity of scour when the pipe moves close to the surface of the sandy bed. The vibration of the pipe results in the rapid development of sandy bed’s scouring. With the increase of gap-to-diameter ratio the distance between the center of the pipe and …
A Piston-Type Porous Wave Energy Converter Theory, Ching-Yun Yueh, Shih-Hsuan Chuang
A Piston-Type Porous Wave Energy Converter Theory, Ching-Yun Yueh, Shih-Hsuan Chuang
Journal of Marine Science and Technology–Taiwan
This study investigates the performance of a piston-type porous wave energy converter (PTPWEC), which consists of a solid wall, a vertical porous plate, a transmission bar, a rigid block constrained by rollers, a spring, and a damper. The PTPWEC is subjected to dynamic external loading by wave actions. To simulate this dynamic system, a mathematical model is used with a single-degree-of-freedom (SDOF) system. Linear wave theory governs the entire fluid domain, which is divided into two regions by the vertical porous plate. Darcy's law is applied to flow through the porous plate. Finally, this investigation employs an eigenfunction expansion to …
Application Of A Support Vector Machine For Liquefaction Assessment, Ching-Yinn Lee, Shuh-Gi Chern
Application Of A Support Vector Machine For Liquefaction Assessment, Ching-Yinn Lee, Shuh-Gi Chern
Journal of Marine Science and Technology–Taiwan
This study presents a support vector machine (SVM)-based approach for predicting earthquake liquefaction. The SVM model database includes five indexes: earthquake magnitude, total overburden pressure, effective overburden pressure, qc values from cone penetration tests (CPT), and peak ground acceleration. The proposed model was trained and tested on a dataset comprising 466 field liquefaction performance records and CPT measurements. A grid search method with k-fold cross-validation was also used to verify the feasibility. Compared with an artificial neural network (ANN)–based method, the SVM-based method has the advantage of increased accuracy and simpler operation. Experimental results show that the proposed SVM approach …
Numerical Simulations And Wind Tunnel Studies Of Pollutant Dispersion In The Urban Street Canyons With Different Height Arrangements, Cheng-Hsin Chang, Jin-Shian Lin, Chii-Ming Cheng, Yung-Shan Hong
Numerical Simulations And Wind Tunnel Studies Of Pollutant Dispersion In The Urban Street Canyons With Different Height Arrangements, Cheng-Hsin Chang, Jin-Shian Lin, Chii-Ming Cheng, Yung-Shan Hong
Journal of Marine Science and Technology–Taiwan
Air pollution in big city areas resulting from exhaust emissions is a major urban problem. Often traffic pollution excess controls air pollution management decisions. There are a number of elaborate predictive models of pollutant dispersion and diffusion that address the effects of variable shapes of city buildings on pollutant concentrations, but few are fully validated. This study presents ventilation behavior in different street canyon configurations. To evaluate dispersion in a model urban street canyon, a series of tests with various street canyons with different height in upwind and downwind of street canyon are presented. These buildings were arranged in 2-D …
Vibration Suppression Of Train-Induced Multiple Resonant Responses Of Two-Span Continuous Bridges Using Ve Dampers, Ying-Jie Wang, Jong-Dar Yau, Qing-Chao Wei
Vibration Suppression Of Train-Induced Multiple Resonant Responses Of Two-Span Continuous Bridges Using Ve Dampers, Ying-Jie Wang, Jong-Dar Yau, Qing-Chao Wei
Journal of Marine Science and Technology–Taiwan
This paper presents a study of reducing multiple resonant peaks of high-speed trains traveling over a two-span continuous railway bridge using visco-elastic (VE) dampers. The moving train is modeled as a series of two-degree-of-freedom (2 DOF) moving oscillators with identical intervals and the two-span continuous bridge as a Bernoulli-Euler beam with uniform span. Because of closely spaced frequencies of a continuous beam, the first several frequencies of the bridge would be excited to resonance during the passage of moving trains, which may result in multiple resonant peaks appearing on the response of train-bridge system. In order to reduce the multiple …
An Improvement Of Wave Refraction-Diffraction Effect In Swan, Aw-Guei Lin
An Improvement Of Wave Refraction-Diffraction Effect In Swan, Aw-Guei Lin
Journal of Marine Science and Technology–Taiwan
SWAN, a wind wave model, has been modified to take into account wave refraction-diffraction effects from the extended mild-slope equation when wind waves pass through a extremely uneven sea bottom in the presence of current. In our modified model, the diffraction correction parameter introduced by Holthuijsen et al. [10] has been adjusted to better predict the combined effect of the higher-order bottom effect, wave-bottom interaction and wave-current interaction. After a preliminary analysis, the influence of the correction parameter is discussed, and a comparison is made between the original and the new phase-decoupled versions of SWAN through some typical examples of …
An Experimental Study Of Regular Long Crested Waves Over A Crescent Type Shoal, Wen-Kai Weng, Jaw-Guei Lin, Chun-Sien Hsiao
An Experimental Study Of Regular Long Crested Waves Over A Crescent Type Shoal, Wen-Kai Weng, Jaw-Guei Lin, Chun-Sien Hsiao
Journal of Marine Science and Technology–Taiwan
Converting the ocean wave energy into electric power is one possibility of the development of alternative and nonpolluting sources of energy. Many researches concerning converters and their converting efficiency of wave power were developed and discussed in the last years. However, converting wave energy into electric power does not only depend upon converting system but condition of sea state essentially. A calm sea state with lower wave energy is difficult to drive converting device working and is unable to satisfy the minimum economical requirement. Unfortunately, wave heights in the sea state around Taiwan are mostly too smaller to extract the …
Criteria For The Initiation Of Modes Of Response Of A Caisson Subjected To A Breaking Wave Force, Jaw Guei Lin, Chi Chao David Tung
Criteria For The Initiation Of Modes Of Response Of A Caisson Subjected To A Breaking Wave Force, Jaw Guei Lin, Chi Chao David Tung
Journal of Marine Science and Technology–Taiwan
This paper concerns problems of a caisson subjected to a breaking wave force: (1) what are the possible modes of response and (2) the conditions initiate into these modes. These two questions have not been studied. The objective of this paper is to answer these two questions. However, the actual response of a caisson that takes place in each mode is not addressed in this study. A caisson placed on a horizontal frictional base, subjected to a concentrated horizontal force of short duration, applied to the seaward side face of the caisson and accompanied by a corresponding uplift force on …
Carbonation Service Life Prediction Of Existing Concrete Viaduct/Bridge Using Time-Dependent Reliability Analysis, Ming-Te Liang, Ran Huang, Shen-Ann Fang
Carbonation Service Life Prediction Of Existing Concrete Viaduct/Bridge Using Time-Dependent Reliability Analysis, Ming-Te Liang, Ran Huang, Shen-Ann Fang
Journal of Marine Science and Technology–Taiwan
This paper examines the predicted carbonation life of an existing concrete viaduct/bridge in the atmospheric environment based on probability and reliability indices. The probability is dependent upon the carbonation rate, carbonation remainder, concrete quality, and concrete cover. The carbonation life is defined as the service life of reinforced concrete (RC) or prestressed concrete (PC) structure at the beginning of time of steel corrosion when concrete cover surfers from carbonation and loses the protection function to steel. The carbonation life is equivalent to the initiation time of corrosion of reinforcement. Both the Chorng-ching viaduct and Wannfwu bridge were offered as illustrative …
Fuzzy Statistical Refinement For The Forecasting Of Tenders For Roadway Construction, Jeng-Wen Lin, Cheng-Wu Chen, Ting-Chang Hsu
Fuzzy Statistical Refinement For The Forecasting Of Tenders For Roadway Construction, Jeng-Wen Lin, Cheng-Wu Chen, Ting-Chang Hsu
Journal of Marine Science and Technology–Taiwan
Due to market competition, construction companies often place low bids when tenders are invited for domestic public construction projects. Over-competition can lead to vicious price wars to win a tender, which can in turn seriously affect the quality of construction. This study aims to establish an accurate Taiwan based model for the forecasting of the tendered price for roadway construction. This model is designed to assist the public sector to determine what would be a reasonable reserve price or award price. In order to ensure accurate predictions, a data classification system is established using fuzzy set theory. For each category …
Rust-Expansion-Crack Service Life Prediction Of Existing Reinforced Concrete Bridge/Viaduct Using Time-Dependent Reliability Analysis, Ming-Te Liang, Jiang-Jhy Chang, Han-Tung Chang, Chi-Jang Yeh
Rust-Expansion-Crack Service Life Prediction Of Existing Reinforced Concrete Bridge/Viaduct Using Time-Dependent Reliability Analysis, Ming-Te Liang, Jiang-Jhy Chang, Han-Tung Chang, Chi-Jang Yeh
Journal of Marine Science and Technology–Taiwan
It is necessary to develop a calculation method to help in the making of feasible, reliable, and serviceable predictions for the service lives of bridge or viaduct structures. This article presents the basis for doing rust-expansion-crack service life predictions for existing reinforced concrete (RC) bridges and viaducts in chloride-laden environments based on timedependant reliability modeling due to the corrosion of steel in concrete. The corrosion process has three stages, the initiation (diffusion or carbonation) time (ti = tc), the depassivation time (tp), and the propagation (corrosion) time (tcorr). The rustexpansion-crack service lives (tcr) of existing RC bridges or viaducts can …
Studies Of The Effect Of Diffusion-Induced Chloride Binding On Chlorination Life Predictions For Existing Reinforced Concrete Bridges, Ming-Te Liang, Jiang-Jhy Chang, Tung-Wei Yu
Studies Of The Effect Of Diffusion-Induced Chloride Binding On Chlorination Life Predictions For Existing Reinforced Concrete Bridges, Ming-Te Liang, Jiang-Jhy Chang, Tung-Wei Yu
Journal of Marine Science and Technology–Taiwan
The chloride ions diffusion is one of important factors of corrosion of reinforced concrete (RC) structures. The total chloride concentration penetrated into concrete can be expressed as the sum of bound and free chloride concentrations. The principal purpose of this paper is to study the chlorination life prediction of existing RC bridges due to chloride binding effect. The investigation method is that the no binding, linear binding, Langmuir and Freundlich adsorption isotherms are substituted into the analytical solutions of linear (diffusivity D = constant) and non-linear (D ≠ constant) diffusion equations associated with initial and boundary conditions, respectively. The chlorination …