Papers by Keyword: Structural Behavior

Abstract: Concrete can be considered as the ultimate construction material since it is the most widely used in the construction materials due to its extensive strength and reasonable cost. Recent years, large investments have been spent for studies on the new advanced materials to enhance the performance and functionality of conventional concrete especially for bridge structure. The application of Ultra-high-performance concrete (UHPC) as advanced materials in bridge application is well established since it able to construct 100m long highway bridge without reinforcement, while fiber reinforced polymers (FRP) required some studies on the optimum composition for bridge application. In this paper, A33 composite FRP from the previous research is studied under 4-point bending test to study the flexural behavior and compared to the UHPC. Three-dimensional finite element analysis of FRP and UHPC I-beam are modelled using Abaqus software to determine and compare the beam deflection and stress. The deflection and stress UHPC and FRP I-beam model being validated with experimental result of four-point bending test and theoretical of equivalent method in previous research. The results from the analytical and experimental are compared and shows good agreements. The presented modeling offers an economical and efficient tool to investigate the structural performance of FRP and UHPC in construction materials.

Abstract: The development of safety has become issue especially for marine and ocean vessels. However, the limitless possibilities of various phenomenon on the sea, make the observation and prediction of ship structure are continuously needed. Side impact is one of those phenomenon. Due to the complexity of ship structure, this phenomenon occurs and produces high nonlinearities, which influence the extent and contour of structural behavior. Such interesting phenomenon was reviewed and studied in present paper using dynamic finite element analysis as the effect of the dependent characteristic of phenomenon to time. Several side scenario models were used to obtain different results in respect of impact location. The kinetic and total energies were presented together with the contours of stress and displacement at two sides of side constructions. Results indicated that the contribution of construction arrangement was significantly affected stress distribution in longitudinal direction of ship hull, while displacement contour from certain scenario produced high intensity on longitudinal member of side construction.

Abstract: Rubbercrete is a concrete containing crumb rubber as partial replacement to fine aggregate. Advantages of rubbercrete have been reported by many researchers. In contrast to normal concrete, rubbercrete is a more ductile which can be used in areas prone to earthquake. In this paper seven reinforced rubbercrete beams without shear reinforcement are fabricated and tested up to failure. Three parameters are considered: beam width, effective depth and a/d. The experimental results are then compared with available shear quations. Available shear quations have produced conservative shear stress prediction for the reinforced rubbercrete beams.

Abstract: This paper describes the results of a fire test conducted on two-way slab with two edges clamped and two edges simply supported. The details of support condition, arrangement of reinforcement, position of displacement transducers and thermocouple trees are described. The experimental results such as the temperature distributions within the slab, vertical deflections and horizontal displacements are presented. The experimental results show that the temperature distribution along the slab depth was nonlinear and the temperature gradients in the slab were large. Main cracks near the clamped edges occurred on the top surface of the slab. It is shown that two-way slab with two edges clamped and two edges simply supported has good fire resistance.

Abstract: High performance concrete (hereafter, HPC) is well known by its high compressive strength, strong resistance to deformation and excellent durability. Whereas, HPC is prone to spall when exposed to high temperatures and it probably results in sharp reduction of the fire resistance and loading capacity of HPC elements and structures. This paper presents a summary of research achievements on fire-resistance behavior of HPC in the past 10 years including the mechanical behavior degradation, analysis of spalling mechanism, effect of various types of fiber and other factors influencing the post-fire properties of HPC material as well as structural behavior of HPC elements. Studies on micro-structure of HPC have been carried out, which will help build a more sophisticated recognition of its performance under high temperatures. In spite of the large number of research results, more improvement on HPC material and HPC structures are still needed because of the devastating consequences caused by strength degradation or spalling-to-collapse. Thus in this paper a new idea of HPC-composite structures is proposed, expected to decrease the probability of spalling.

Abstract: The main doors of medieval buildings or building complexes such as cathedrals or palaces are substantial structures, often weighing as much as one tonne per leaf. A survey of medieval English doors shows several distinct structural types whose different structural actions will be considered. All must develop some form of in plane action through the interaction of their components to transmit their weight back to their supports. However their complexity often allows several different modes of action, each of which will be differently affected by moisture movement within the timber, so that more than one mode of action will often need to be considered. The recent need to repair the early sixteenth century main doors of Trinity College, Cambridge involved the detailed analysis of one of these types whose structure comprised a dense grid of relatively slender muntins and ledges set within a much more substantial frame, carrying decorated boarding and mouldings on the outside face. The intention was that by understanding this structure we would be able to restore the original structural action of the door. In this case earlier interventions and permissions, and the extent of deterioration at the lower hinges, made this impossible. However, the exercise suggests an approach that might be valuable in the restoration of other doors of this type.

Abstract: This paper describes the results of a fire test conducted on two-way simply supported concrete slab. The details of support condition, arrangement of reinforcement, position of displacement transducers and thermocouple trees are described. The experimental results such as the temperature distributions within the slab, vertical deflections and horizontal displacements are presented. The experimental results show that the temperature distribution along the slab depth was nonlinear and the temperature gradients in the slab were large. Three main cracks parallel to the short span direction occurred on the top surface of the slab. It is shown that two-way simply supported concrete slab has good fire resistance.

Abstract: This study shows structural behaviors of an innovative space truss typed temporary structure which is effectively used to maintenance and repairs of road tunnels. This evaluated structure has merits to carry out maintenance works of tunnels without blocking cars and transportations. Numerical modeling and analytical testing of the space truss system are investigated by using a commercial engineering program, i.e., ABAQUS 6.5-1, and then it are verified that the truss system takes both structural safety and effective function for maintenances and repairs of road tunnels.

Abstract: This paper presents experimental research on axial structural behaviour of 14 short wood columns externally strengthened with CFRP, BFRP and AFRP fibers. All columns for tests were subjected to axial compressive load. The work carried out has indicated how different types of fiber cloth, strengthened arrangements and fiber layers affect behaviour of the short reinforced wooden columns. Research output shows that carrying capacity, stiffness and ductility of FRP reinforced wood columns is improved, and the increasing relationship between the reinforcement layers and bearing capacity is not linear. The all-bonded reinforcement scheme is better than semi-bonded one, and the semi-bonded one is better than the interval-bonded one. The performance of CFRP and BFRP reinforced columns is applied fully. This study confirms that the FRP reinforcing technique significantly enhances the carrying capacity of short wood columns.

Abstract: Base on the achievement and research on the concrete filled steel tube (CFST), with 4 aspects: research on fundamental structural behavior, dynamic property, bonding theory of interface and research on the concrete filled square steel tube, summarize the findings about CFST and introduce the 4 stages of development of study of CFST. Point out that the research on the bond theory of interface between steel tube and core concrete and the concrete filled square steel tube are needed the further study and research.