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Open Access. Powered by Scholars. Published by Universities.®

2004

National Taiwan Ocean University

Civil and Environmental Engineering

Articles 1 - 11 of 11

Full-Text Articles in Engineering

Vibration Of Simply Supported Compound Beams To Moving Loads, Jong-Dar Yau Aug 2004

Vibration Of Simply Supported Compound Beams To Moving Loads, Jong-Dar Yau

Journal of Marine Science and Technology

This paper is aimed at investigating the dynamic response of a compound beam subjected to moving loads at high speeds. The compound beam structure is composed of a simple beam and a twomember truss connected by a set of rigid bars at the midpoint of the beam. Based on the nonlinear elastic theory of a symmetric twomember truss under the action of a vertical tip load, and the incremental-iterative solution procedures for solving a nonlinear dynamic system, the dynamic response of the compound beam structure under the excitation of moving loads is studied. According to the numerical results, the nonlinear …

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The Marine Single Assignment Nonstrict Hub Location Problem: Formulations And Experimental Examples, Shang-Hsing Hsieh, Hsien-Lun Wong Aug 2004

The Marine Single Assignment Nonstrict Hub Location Problem: Formulations And Experimental Examples, Shang-Hsing Hsieh, Hsien-Lun Wong

Journal of Marine Science and Technology

Marine hub-and-spoke networks have been applied to routing containerships for over two decades, but few papers have devoted their attention to these networks. The marine network problems are known as single assignment nonstrict hub location problems (SNHLPs), which deal with the optimal location of hubs and allocation of spokes to hubs in a network, allowing direct routes between some spokes. In this paper we present a satisfactory approach for solving SHNLPs. The quadratic integer profit programming consists of two-stage computational algorithms: a hub location model and a spoke allocation model. We apply a heuristic scheme based on the shortest distance …

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Evaluation Of Development Strategies For Kaohsiung Port Using A Goals Achievement Method, Wen-Chih Huang Aug 2004

Evaluation Of Development Strategies For Kaohsiung Port Using A Goals Achievement Method, Wen-Chih Huang

Journal of Marine Science and Technology

The Port of Kaohsiung was the third largest container port in the world before 1999, although it dragged to sixth place by 2003. In order to increase the port’s competitiveness, this research outlines six goals and twenty-seven strategies from the viewpoint of international logistics. This research uses the goals achievement measurement for strategic planning effectiveness, and it was undertaken to develop the Goals Achievement Evaluation Model (GAEM) to cope with the problems of a large number of strategies and ambiguity in strategic definition. The GAEM uses a two-stage Delphi questionnaire by simplifying the quantity of responses on the survey. The …

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3-D Liquefaction Potential Analysis Of Seabed At Nearshore Area, Chih-Hsin Chang, Lien-Kwei Chien, Yao-Hsien Chang Jun 2004

3-D Liquefaction Potential Analysis Of Seabed At Nearshore Area, Chih-Hsin Chang, Lien-Kwei Chien, Yao-Hsien Chang

Journal of Marine Science and Technology

In this research, we discussed about the wave induced seabed liquefaction at nearshore based on the viewpoint of marine geotechnical engineering. The behaviors of seabed sand under wave loading were evaluated by experiments carried out in the Chien’s cyclic triaxial testing system (type II). Different loading periods, effective confining pressure and relative densities affected the liquefaction resistance of seabed sand that we sampled at northeastern coast in Taiwan. Furthermore, this study proposed the 3-D evaluation method of seabed liquefaction at Yi-Lan nearshore in case that combined the liquefaction resistance of seabed sand and Nearshore Spectral Windwave (NSW) model. The new …

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A Selection Model For In-Terminal Container Handling Systems, Wen-Chih Huang, Chin-Yuan Chu Jun 2004

A Selection Model For In-Terminal Container Handling Systems, Wen-Chih Huang, Chin-Yuan Chu

Journal of Marine Science and Technology

This paper describes the main characteristics of in-terminal container handling systems and analyzes the factors affect the total cost of these handling technologies. A cost model is developed for decision making. It includes land cost, equipment procurement cost, maintenance cost, handling efficiency, labor cost, etc. A handling cost comparison indicator Ri/j is also proposed to make the pair comparisons between handling systems and thus to determine the most economical handling technology in the container yard. The results show that for yard cranes to be more economically operation only when procurement cost, yard size, interest rate, number of handlings per container …

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Stability Analysis On The Initial Surface-Wave Generation With An Air-Sea Coupled Shear Flow, Wu-Ting Tsai, Mei-Ying Lin Jun 2004

Stability Analysis On The Initial Surface-Wave Generation With An Air-Sea Coupled Shear Flow, Wu-Ting Tsai, Mei-Ying Lin

Journal of Marine Science and Technology

The temporal instability of a two-dimensional perturbed wave in a coupled air-water shear flow is considered to study the generation and initial growth of wavelets by the air flow. A robust numerical method is developed to solve the coupled Orr-Sommerfeld equations and the interfacial conditions governing the linear viscous instability of the perturbed flow. Calculations of the growth rates and phase speeds of the unstable wavelets compare well with the early theoretical as well as numerical predictions, and also reveal that the discrepancy in the numerical results of Wheless and Csanady (1993) indeed are due to erroneous calculations. Dependence of …

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A Case Study Of S-Curve Regression Method To Project Control Of Construction Management Via T-S Fuzzy Model, Ting-Ya Hsieh, Morris Hsiao-Lung Wang, Cheng-Wu Chen Jun 2004

A Case Study Of S-Curve Regression Method To Project Control Of Construction Management Via T-S Fuzzy Model, Ting-Ya Hsieh, Morris Hsiao-Lung Wang, Cheng-Wu Chen

Journal of Marine Science and Technology

In the contractual business, construction firms are generally more concerned with short-term financial strategies than the longterm ones. Working capital management is the central issue of all short-term financial concerns. Thus, it's urgent to study the cash portion of working capital management to rationalize the amount of cash and current assets possessed in certain time. The S-curve is quite suitable to represent the relationship between project duration and complete progress in practical usage of construction management. Based on the technique of Takagi-Sugeno (T−S) fuzzy model, the fuzzy regression model is constructed for curve fitting problems. According to the cash flow …

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Hazards Identification Model For Rail Rapid Transit Accidents, Lung-Chuang Wang Apr 2004

Hazards Identification Model For Rail Rapid Transit Accidents, Lung-Chuang Wang

Journal of Marine Science and Technology

In comparison with the other transportation modes, rail rapid transit already enjoys a higher degree of safety as it is designed with the exclusive right of way and the automatic train control and monitoring systems. Nevertheless, rail rapid transit systems are not free from serious accidents, which often led to human injuries and facility damages. The planning of accident prevention and emergency measures, therefore, are still important issues of the rail rapid transit operations. The model presented in this study analyses the process of hazard identification in two stages, which clearly indicate the factors of the inherent and direct hazard …

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Laterial Performance Of Drilled Shaft Considering Nonlinear Soil And Structure Material Behavior, Chao-Kuang Hsueh, San-Shyan Lin, Shuh-Gi Chern Feb 2004

Laterial Performance Of Drilled Shaft Considering Nonlinear Soil And Structure Material Behavior, Chao-Kuang Hsueh, San-Shyan Lin, Shuh-Gi Chern

Journal of Marine Science and Technology

In addition to nonlinear soil behavior has been assumed in conventional analytical method, performance of the laterally loaded drilled-shaft is also strongly influenced by possible concrete cracking, steel yielding, and shaft/soil separation and interaction. However, these factors are often neglected in the most of available methods and studied results. The main purpose of this paper is to investigate the importance of the above-mentioned effects on lateral performance of drilled reinforced-concrete shaft. The finite element code, ABAQUS, which is available in the three-dimensional analysis is adopted for taking into account the nonlinearity in shaft and soil materials, pilesoil interaction and nonlinear …

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Effects Of Earthquake Excitation On The Strength Properties Of Newly Poured Concrete, Jen-Hui Su, Tsong Yen Feb 2004

Effects Of Earthquake Excitation On The Strength Properties Of Newly Poured Concrete, Jen-Hui Su, Tsong Yen

Journal of Marine Science and Technology

This study examines the 28-day strength properties of concrete under shaking, such as from an earthquake, during its strength development period. With a concrete strength of 20.59 MPa (3,000 psi), groups of concrete cylinders were made and tested on a shaking table. The peak value of ground acceleration (PGA) level of the simulated earthquake and the cylinder age are the two variables considered. The test results are as follows. If the concrete is older than three days, the earthquake excitation will not significantly reduce its 28-day strength. At younger than two days, earthquake excitation will reduce the strength of the …

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Selection Of Area Suitable For Performing Partial-Depth Repair Of Corner Damage Of Concrete Paving Slab Under Wheel Load, Chau Lee, Xin-Hua Huang, Jhao-Bin Lin Feb 2004

Selection Of Area Suitable For Performing Partial-Depth Repair Of Corner Damage Of Concrete Paving Slab Under Wheel Load, Chau Lee, Xin-Hua Huang, Jhao-Bin Lin

Journal of Marine Science and Technology

This study reveals the characteristics of using different repair materials and different repair outline designs for the partial-depth repair of the damage to corners of concrete paving slabs under wheel load. 3D finite element models were used to study how the changes to the outlines of the repaired area affect the maximum-stress and lowstress proportions in concrete elements that are attached to repaired interface when different repairing materials are used. The results indicate that the maximum stress increased but the proportion of lowstress shrank as the repaired area became larger. When cementitious repair materials were used, the depth of a …

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