Applied Mechanics and Materials Vols. 405-408

Abstract: This thesis introduces a brief of the development status of the gravel pile and the basic principles, and analysis of vibration displacement stone column foundation treatment influencing factors by the Analytic Hierarchy Process. To compare and analyzed from it, and apply the square root method to calculate their weight; According to the evaluation set structure distribution trapezoidal membership function, and get the final membership of each index to evaluating set and fuzzy relation matrix; By the analysis of application of a wharf, and find out the comprehensive score stability gravel pile system, we have certain reference from it in the future.

Abstract: As the author has discovered in the pratice of the project design, the steel pipe size in the truss structure will increase with the expanded span of the spatial structure, far exceeding its original range of application. Therefore, the resulting effect of the joint additional moment on the steel pipe crossing nodes should not be ignored, and how to calculate the ultimate flexural capacity of the steel tubular joints has become an urgent problem to be solved in the joint design. However, the research on ultimate load-carrying capacity is mainly restricted in utilizing the current data and Code for Design of Steel Structures to analyze the axial load-carrying capacity, and the research on ultimate load-carrying capacity of the joint under additional moment is still inadequate. This paper, from the joint stiffness perspective, initiates with brief analysis of the effect of steel pipe size on the joint additional moment so as to illustrate the rationale and necessity for taking into account the joint additional moment in the steel pipe structure, and follows with the adoption of both three-dimensional four-joint 181 elastoplastic shell element and the finite element model (by which N-shaped circular steel pipe crossing nodes is established for the ideal elastoplastic material in ANSYS finite element program) to fit the formula for the flexural capacity of the N-shaped joints based on orthogonal test method and regression technique with geometric nonlinearity and material nonlinearity taken into consideration. It is designed to provide some reference for the design and application of steel tubular intersecting joints in the future.

Abstract: Targeting at a factor 20 reduction of the environmental load of buildings in 2040, it is necessary and logical to start by reducing the environmental load of the most important aspects of a building. The bearing structure is responsible for the second largest part of the environmental load of the building; the energy consumption is responsible for the greater part, assuming the life span of a building is 75 years (van den Dobbelsteen & van der Linden, 2000)[2]. The bearing structure consists of the foundation, columns, beams, floor and roof structure, and sometimes walls and facades. The horizontal elements of the bearing structure, comprising of the floor, roof structure and beams, are causing about 80% of the environmental load of the total bearing structure. Particularly the floor & roof structure play a very remarkable role (Arets, 2000). Therefore, optimization of the floor structure will lead to an important environmental improvement of the whole office building. The question which structural material is ecologically or economically best, depends on the span the building design needs. For each floor type, for structural spans between 4.8 and 16.8 m, the environmental load and cost have been determined, resulting in a clear overview of best solutions for different spans.

Abstract: Steel-concrete composite beams have been widely used in the high-rise buildings and large span steel structure. Composite beams effective flange width has been further investigated in domestic, as well as the force and deformation within elastic stage and plastic stage. In this paper, we give out the formula derivation of steel-concrete composite beams stiffness amplified coefficient. Combined with a practical engineering, we analysis the impact of stiffness amplified coefficient on the whole structure by SAP2000 software and compare the results back and forth. In the end, we put forward some suggestions for construction engineers.

Abstract: Nonlinear numerical analyses for the stress performance of SRC frame intermediate joints, side Joints and end joints are processed in this paper with the finite element software of ABAQUS. Compared with experimental results under static loading, numerical analysis results are found to be reasonable. Then the influence of factors such as shaped steel ratio and axial-load ratio are contrastively analyzed under cyclic loading. The results show that shaped steel ratio has a greater influence on the bearing capacity and hysteretic performance of the structure and with the steel ratio increases, the hysteretic performance is better. But the axial-load ratio has less influence.

Abstract: The reinforced concrete thin-walled channel beams are widely designed as bridges in urban railway and city roads. The swing force in the driving which cause constrained torsion becomes a safety factor. The torsion resistance of concrete members is not adequate to thin-walled channel beams, which is based on the theory of spatial truss with variable angle. An experiment was conducted to test the mechanical properties of the thin-walled channel beam under torsion. The mechanical properties of RC thin-walled channel beam under restrained torsion were also researched with Finite Element software, and were compared to the result of the experiment. The result of FE model agreed well with the experiment.

Abstract: In this paper, in order to simulate the corrosion of seawater, the drying-wetting cycling test was used. The mechanical properties of carbon fiber-reinforced concrete beam under salt damage were studied and the reinforcement effect of the CFRP was analyzed. At the same time, the bearing capacity of cross section of CFRP strengthened PC beam under corroded was analyzed.

Abstract: t is adopted the CEB-FIP (1990) shrinkage and creep model for analysis in three different structure by making a comparative analysis of the existing shrinkage and creep model. The influence law of different structure is obtained. It is shown that the hybrid structure system of concrete structure and steel structure can coordinate both force performance and make it is more consistent with design value.

Abstract: According to the building^,s light steel roof leaking phenomenon, the main potential cause and harm of leakage of the building structure are analyzed. Based on the principle of roof water leakage and waterproof cracking mechanism, combined with the engineering practice, the design principle and control measures of roof water leakage are put forward.

Abstract: The passing dam building of Xiangjiaba water conservancy project adopts gear-rack climbing vertical structure. The structure demands highly on the deformation compatibility of relative displacement between tower and nut column, and rack and guide. If it is constructed poorly, it will directly influence the ship lifts running and construction period. The paper takes this as its key research object. 3D FEM is used to analyze the tower structure, mainly calculating the deformation of the tower under the temperature, weight, wind load and other loads in a normal single case and combination cases. By focusing on the theory analysis of the important parts such as nut column, rack and guide, the structures deformation fitness, this paper offers a fair theoretical reference and technological guidance to the construction of every part of the tower.