Str-931: Timber I-Joists With Web Openings: Reinforcement, Capacity Prediction And Sensitivity Analysis,
2016
University of British Columbia
Str-931: Timber I-Joists With Web Openings: Reinforcement, Capacity Prediction And Sensitivity Analysis, Md. Shahnewaz, M. Shahidul Islam, M. Shahria Alam, Thomas Tannert
Canadian Society for Civil Engineering
Timber I-joists are a popular product in light-frame wood construction in North America. The design with timber I-joists, however, has not yet achieved the same level of refinement compared to reinforced concrete or steel structures. One of the reasons is that timber I-joists have higher variability in their material properties than more homogeneous building materials. Additionally, although very commonly applied in practice, engineers and practitioners have limited knowledge and guidance for I-joists with web opening. As a result, in many cases the design of timber I-joists based on manufacturer’s specifications lead to very conservative solutions. The present research predicts the …
Str-937: Behaviour Of Frp-Reinforced Cfft Columns Under Axial Compression Loading,
2016
University of Sherbrooke
Str-937: Behaviour Of Frp-Reinforced Cfft Columns Under Axial Compression Loading, Asmaa Abdeldaim Ahmed, Radhouane Masmoudi
Canadian Society for Civil Engineering
This paper presents the test results of an experimental study aimed at investigating the axial behaviour of CFFT columns internally reinforced with steel and FRP bars. A total of eight reinforced concrete (RC) and concrete-filled FRP tube (CFFT) columns were constructed and tested until failure. All columns had 1900-mm in height and 213-mm in diameter. The test parameters were: (1) internal reinforcement type (steel, glass FRP (GFRP), or carbon FRP (CFRP) bars) and amount, (2) GFRP tube thicknesses, and (3) nature of axial loading type (i.e. monotonic and cyclic). The experimental results revealed that the CFFT columns reinforced with GFRP …
Str-934: Fatigue Response Of Uhpc As A Closure Strip Material In Prefabricated Bridge Applications,
2016
University of Waterloo
Str-934: Fatigue Response Of Uhpc As A Closure Strip Material In Prefabricated Bridge Applications, Benjamin D. Dow, Scott Walbridge, Jeffrey S. West
Canadian Society for Civil Engineering
Replacement of concrete bridge decks can be an expensive process. In order to decrease costs and time of construction, precast deck panels can be used with closure strips cast in place between the panels. In order to ensure that these connections can withstand the rigors of a bridge’s life cycle, fatigue testing was completed on a specimen consisting of two precast concrete panels reinforced with GFRP and connected using a UHPC closure strip. These panels were subjected to 2,000,000 cycles of fatigue loading at three locations and subject to static failure loading at one location following fatigue loads. It was …
Str-930: Cross Laminated Timber Walls With Openings: In-Plane Stiffness Prediction And Sensitivity Analysis,
2016
University of British Columbia
Str-930: Cross Laminated Timber Walls With Openings: In-Plane Stiffness Prediction And Sensitivity Analysis, Md. Shahnewaz, M. Shahria Alam, Thomas Tannert, Marjan Popovski
Canadian Society for Civil Engineering
Cross-laminated timber (CLT) is gaining popularity in residential and non-residential applications in the North American construction market. An accurate quantification of in-plane stiffness of the CLT walls with openings is required to design a CLT structure subjected to lateral loads. Nevertheless, till today, no general approach is available for the design of CLT-members loaded in plane and there are no standardized methods for determining the stiffness of CLT shearwalls in the respective material design standards: the CSA O86 in Canada, and the NDS in the US. This study aims to quantify the stiffness of CLT walls with openings under in-plane …
Str-938: Flexural Behaviour Of Rectangular Frp-Tubes Filled With Reinforced Concrete: Experimental And Analytical Investigations,
2016
University of Sherbrooke
Str-938: Flexural Behaviour Of Rectangular Frp-Tubes Filled With Reinforced Concrete: Experimental And Analytical Investigations, Ahmed Abouzied, Radhouane Masmoudi
Canadian Society for Civil Engineering
This paper presents experimental and analytical investigations on the flexural behaviour of rectangular concrete-filled fiber-reinforced polymer (FRP) tube (CFFT) beams with steel rebar. Eight full-scale CFFT beams and two control reinforced concrete (RC) beams were tested under a four-point bending. Several parameters as the FRP tubes thickness, fiber laminates, and steel reinforcement were studied. The experimental results indicate outstanding performance of the CFFT beams in terms of strength and ductility compared to the RC beams. Some CFFT beams attained flexural strength and ductility 540% and 1430% higher than that of the RC beams, respectively. Theoretical analysis was developed to determine …
Str-942: Punching Shear Of Self-Consolidating Two Way Slabs,
2016
Dillon Consulting Ltd.
Str-942: Punching Shear Of Self-Consolidating Two Way Slabs, Hossameldeen Bakr, Amgad Hussein, Assem A. A. Hassan
Canadian Society for Civil Engineering
This paper presents an experimental program conducted to investigate the punching shear behaviour of self-consolidating (SCC) two-way slabs, and the influence of using different sizes of coarse aggregate and slab thickness on this behaviour. For this purpose, a total of six slabs were tested. Two groups of labs with targeted compressive strength of 30 MPa were used; for group A, 10 mm coarse aggregate size was used, and 20 mm coarse aggregate size was used for the slabs in group B. Each group consisted of three slabs with different thicknesses of 150, 200, and 250 mm. The results revealed a …
Str-940: Parametric Simulation Of Roof Structural Snow Loads,
2016
Rowan Williams Davies & Irwin Inc.
Str-940: Parametric Simulation Of Roof Structural Snow Loads, Albert J. Brooks, Jill V. Bond, Scott L. Gamble, Jan C. Dale
Canadian Society for Civil Engineering
While the National Building Code of Canada (NBCC) provides engineers with suitable snow loading guidelines for structural design, the strict application of the code may not lead to an optimized structural design. Generalizations have been made to ensure the applicability of the code to the majority of potential structures within Canada, which result in conservative estimates in certain situations. In particular, the interaction between region-specific prevailing wind directionality, climate and roof orientation are not accounted for. However, the development of advanced physical and numerical snow simulation approaches allows for the investigation of building-specific variables that affect snow loading. The Finite …
Str-941: Numerical Investigation Of Reinforced Concrete Barriers Subjected To Blast Loading,
2016
Western University
Str-941: Numerical Investigation Of Reinforced Concrete Barriers Subjected To Blast Loading, Ahmed M. Ibrahim, Hamed M. Salem, Ahmed M. Farahat
Canadian Society for Civil Engineering
People’s lives are threatened by explosions; the tragic terrorist attacks have forced the governments to consider the importance of dealing with these attacks. With the rising threat of terrorism, protecting critical civil infrastructure such as embassies, governmental buildings, and airports against bomb attacks has become a critical issue. In the current research, reinforced concrete barriers subjected to blast loading are numerically investigated using Applied Element Method “AEM”. The blast loads adopts the ASCE guidance for design of blast-resistant buildings in petrochemical facilities. Fully nonlinear dynamic analysis was considered where the barriers thickness and reinforcement, end connections were parametrically investigated. It …
Str-944: Effects Of Finite Element Modelling Approach For Prestressing System On The Pressure Capacity Of A Candu Containment Structure,
2016
Ryerson University
Str-944: Effects Of Finite Element Modelling Approach For Prestressing System On The Pressure Capacity Of A Candu Containment Structure, I. Tavakkoli, M. R. Kianoush, H. Abrishami, X. Han
Canadian Society for Civil Engineering
The primary objective of this article is to investigate the response of a CANDU®1 nuclear power plant containment structure to a much higher internal pressure that could be encountered during a severe accident. In this study, for the prestressed containment structure, a detailed model is obtained by a full 3D model. Nonlinear finite element method is employed to predict the response of the structure using ANSYS software. The major challenges for modelling prestressing tendon elements are to accommodate parameters affecting prestressing forces. In previous research studies, the prestressing system is modelled using an equivalent pressure and tendon end forces, and …
Str-947: Column Retrofit By Plastic Hinge Relocation Using Advanced Composite Materials,
2016
Fyfe Company
Str-947: Column Retrofit By Plastic Hinge Relocation Using Advanced Composite Materials, Scott F. Arnold
Canadian Society for Civil Engineering
Advanced composite materials composed of carbon and glass fiber reinforced polymers, have been used to retrofit reinforced concrete columns for over two-decades. The original testing of these systems started in the late 1980’s and continues to the present day. The first tests, performed at the University of California at San Diego under the guidance of Professor Nigel Priestley, were focused on the use of unidirectional composites that were oriented in the transverse direction. The goal of many of the these tests was to essentially supplement the existing transverse reinforcement in order to change what would have been a premature shear …
Str-946: Experimental Study On A Novel Shear Strengthening Technique For Precast Prestressed Hollow-Core Slabs,
2016
University of Windsor
Str-946: Experimental Study On A Novel Shear Strengthening Technique For Precast Prestressed Hollow-Core Slabs, Xianzhe Meng, Shaohong Cheng, Amr El Ragaby
Canadian Society for Civil Engineering
Precast, prestressed hollow core (PHC) slabs are widely used in civil construction, typically as floor or roof in office and residential buildings as well as parking structures. Since the manufacturing process does not allow the installation of shear stirrups, shear resistance of PHC slabs relies solely on the shear strength of concrete itself. In some cases, the slab could possibly be subjected to concentrated load or line load caused by moving vehicles and cargos. Thus, shear failure is likely to occur at the region close to supports. Traditional remedies include choosing thicker slabs and filling the voids of PHC slabs, …
Str-949: Disturbance To Nearby Surface Structures Caused By Tunneling Induced Ground Displacements,
2016
Dalhousie University
Str-949: Disturbance To Nearby Surface Structures Caused By Tunneling Induced Ground Displacements, Anna Maria Zakhem, Hany El Naggar
Canadian Society for Civil Engineering
Damage to nearby surface structures caused by excavation-induced ground displacements is a major concern during excavation of tunnels in congested urban areas. Hence, developing a reliable numerical model for predicting the possibility of damage to nearby structures is needed. This paper presents the details of a comprehensive 3D finite element model developed to study the induced structural distortions of adjacent structures due tunneling activities. The proposed 3D model used the newly develop shotcrete material model in Plaxis to model the reinforced concrete elements of the tunnel. Utilizing the developed FE model the characteristics of the soil-structure interaction were studied and …
Str-954: Flexural Behavior Of Sandwich Panels Made Of Frp Composites: Synthetic And Natural Fibers,
2016
Dalhousie University
Str-954: Flexural Behavior Of Sandwich Panels Made Of Frp Composites: Synthetic And Natural Fibers, Pedram Sadeghian, Dimo Hristozov, Laura Woblewski
Canadian Society for Civil Engineering
Sandwich panels made of fiber-reinforced polymer (FRP) skins and light-weight core materials have the potential to be effectively used in several structural applications such as cladding, decking, and roofing panels. The FRP skins resist the tensile and compressive stresses resulting from the flexure induced by transverse loadings and the core resists shear stresses, serves as insulation, and separates the FRP skins at a desired distance to provide required moment of inertial. In this study, two types of fiber materials, namely synthetic (glass) and natural (flax) fibers, as well as two types of core materials, namely polypropylene honeycomb (thickness: 6.4, 12.7, …
Str-952: Rapid Bridge Replacement Of Concrete Rigid Frame Bridges Utilizing Heavy-Lift Construction Technique,
2016
MMM Group Limited
Str-952: Rapid Bridge Replacement Of Concrete Rigid Frame Bridges Utilizing Heavy-Lift Construction Technique, Han Choi, Trevor Small
Canadian Society for Civil Engineering
A rapid bridge replacement (RBR) method was designed and used for the replacement of the Highway 401 twin overpasses at Cornwall Centre Road in Cornwall, Ontario. This RBR project was the first heavy-lift and move of large, approximately 1400 tonne, reinforced concrete rigid frame bridges in Ontario. The new structures were prefabricated in staging areas near the sites and moved to their final locations by specialized heavy-lift construction equipment, comprising self-propelled modular transporters (SPMTs). For the westbound lane structure, a segmental approach where a top rigid frame component and two bottom footing components were constructed separately and connected at their …
Str-960: Eliminating Environmental Influences In Vibration-Based Damage Detection Using Armax Residual Error And Artificial Neural Networks,
2016
University of Alberta
Str-960: Eliminating Environmental Influences In Vibration-Based Damage Detection Using Armax Residual Error And Artificial Neural Networks, Haiyang H. Zhang, Mustafa Gül
Canadian Society for Civil Engineering
Despite offering a great promise for continuous and automated monitoring of civil infrastructure systems, vibration-based damage detection methods may yield false positives and negatives due to environmental and/or operational effects. This paper presents a method based on ARMAX residual error in conjunction with Artificial Neural Networks (ANNs) to eliminate the environmental effects from damage detection process. A finite element model of a bridge type structure was simulated with different damage scenarios under various temperatures. Damage features obtained from statistical process on ARMAX residual errors were then compared between with and without environmental effects. Artificial neural networks were trained to learn …
Str-953: Burst Pressure Assessment For Pipelines With Multiple Corrosion Defects,
2016
Memorial University of Newfoundland
Str-953: Burst Pressure Assessment For Pipelines With Multiple Corrosion Defects, Bipul Chandra Mondal, Ashutosh Sutra Dhar
Canadian Society for Civil Engineering
Pipeline with multiple corrosion defects are often observed in the field. The strength of pipe with multiple corrosion patches depends on the corrosion patch intensity, their locations along longitudinal and circumferential directions of the pipe, in addition to the parameters influencing the strength of pipe with single corrosion defect. The existing design codes recommend the spacing between the corrosion patches when the interacting corrosion patches can be considered as a single patch for calculating the burst pressure of the defected pipe. In this paper, the strength and deformation characteristics of corroded pipe are investigated using finite element analysis. The parameters …
Str-957: Effects Of Clt-Infill Walls On The Collapse Behavior Of Steel Moment Resisting Frames,
2016
University of British Columbia
Str-957: Effects Of Clt-Infill Walls On The Collapse Behavior Of Steel Moment Resisting Frames, Matiyas A. Bezabeh, Solomon Tesfamariam
Canadian Society for Civil Engineering
Over the past six years, to increase the use of renewable materials in the construction industry, a novel steel-timber hybrid building system was developed and studied at the University of British Columbia and FPInnovations. The hybrid structural system was a steel moment resisting frames (SMRFs) with Cross Laminated Timber (CLT) infill walls. These studies were mainly on developing: novel connection types, new constitutive laws for the CLT walls, and force-based and displacement-based design guidelines. The effect of CLT infills on the collapse risk of the SMRFs was not explicitly investigated, and is the topic of this paper. With consideration of …
Str-959: Optimization Of A Polygonal Hollow Structural Steel Section In The Elastic Region,
2016
Queen's University - Kingston, Ontario
Str-959: Optimization Of A Polygonal Hollow Structural Steel Section In The Elastic Region, John Samuel Kabanda, Colin Macdougall
Canadian Society for Civil Engineering
Square, rectangular, circular, elliptical, and oval steel hollow structural sections are commonly used in a wide range of structural applications. The need for deep sections with increased bending stiffness has been the motivation for polygonal hollow structural sections. Polygonal hollow structural sections can have a higher bending strength, and rotational capacity when compared to traditional rectangular or square hollow structural sections with similar cross-sectional area. This paper discusses the numerical optimization of one such polygonal hollow structural section currently used in Canada. Previously conducted full-scale beam bending tests provide data for the calibration of the numerical model. The optimized cross-section …
Str-956: Prestressed Timber Structures For Multi-Storied Buildings: From Theory To Practice,
2016
University of Northern British Columbia
Str-956: Prestressed Timber Structures For Multi-Storied Buildings: From Theory To Practice, Asif Iqbal
Canadian Society for Civil Engineering
A new generation of buildings have been designed in recent years with an innovative structural system developed in New Zealand over the last decade. Conventional post-tensioning is combined with timber structures made of engineered wood products to produce highly efficient systems suitable for supporting long floor spans. The moment connections are particularly useful in structures designed for seismic regions. The post-tensioning ensures self-centering in addition to ductility provided by additional energy dissipating elements within the connections. Extensive experimental and numerical studies have confirmed the expected performance of the systems and design procedures have been developed for practical applications. A summary …
Str-961: Frp Shear Connectors For Reinforced Concrete Composite Elements,
2016
University of Windsor
Str-961: Frp Shear Connectors For Reinforced Concrete Composite Elements, Jehad Alkatan, Amr El Ragaby, Faouzi Ghrib
Canadian Society for Civil Engineering
Currently, friction shear dowels (steel stirrups) are being used in bridge construction at the interface plane between the cast-in-place deck slab and the precast girder to ensure the composite action for stronger cross section. As the bridge deck slab deteriorated over time due to the environmental conditions, these shear steel dowels are also susceptible to sever corrosion and will need replacement, especially when de-icing salt is used. This results in gradual loss of the composite behavior and strength of the composite section. Fiber reinforced polymers (FRPs) reinforcements have shown to be an effective alternative to black steel as flexure and …
