Applied Mechanics and Materials Vols. 204-208

Abstract: Soil is a strong non-linear media and show obvious nonlinear under the small displacement of the foundation. Under the strong earthquake, the seismic performance of group pile foundation is closely related to the nonlinear force-displacement relationship of soil around the pile foundation and the elasto-plasticity o fpile. This paper introduces the nonlinear static pushover analysis of group pile foundation , summarizes the commonly used simulation method of soil around the pile foundation and compares the advantages and disadvantages of various simulation method.

Abstract: Due to the multilayer mixed structure is a planted in hot summer and cold winter zone of the widespread use of the traditional construction form, its exterior wall palisade structure heat of existing in the large thermal bridge is main wall of heat consumption important parts. According to the features of the climate, analysis exterior insulation system thermal bridge characteristics, from the wall materials heat transfer coefficient calculation and analysis of the prevention and control of the thermal bridge proposed measures.

Abstract: In this article, the distribution of plastic hinge model is adopted to simulate the elastic and plastic of pile body, p-y curve is used to simulate resistance of pile foundation soil. We do static non-linear pushover analysis of the single pile of pile foundations, and research the influence of the axial compressive ratio η of pile shaft, longitudinal reinforcement rate ρ of section, stirrup ratio µof section and shear strength C of foundation soil to the system-interaction of pile and soil. The result shows that axial compressive ratio of pile shaft has a significant influence on horizontal limit bearing capacity and the displacement ductility of the system. With the increase of the axial compressive ratio, system of the displacement ductility reduces gradually, but the limit bearing capacity increases gradually. Under a horizontal load, the order and the mechanism of plastic hinge are obviously different because of different axial compressive ratio of pile shaft，This analysis method may further provide a reference for nonlinear seismic analysis of pile bents.

Abstract: This paper studies the working mechanism, ductility, and ultimate load bearing capacity of the composite columns through axial load bearing capacity experiments on eight steel skeleton-steel pipes reinforced composite concrete columns. The results show that the collaborative work between the steel pipe, steel skeleton and concrete can effectively improve the bearing capacity of the column, delay or inhibit the spread of shear diagonal cracks in the concrete and improve the ductility of the column. In addition, the finite element software ANSYS is used to digitally simulate the whole process of axial pressure test, and the resulting load-displacement curves and experimental curves agree fairly well.

Abstract: Based on the needs of housing industrialization, prefabricated structures with good development prospects, rational connection structure is the key of prefabricated structure to the development and application. Classify and analyze on the connection of prefabricated components in this essay. Summarize the research results and status on the prefabricated structure of shear wall at home and abroad .And finally, make the prospect on the development and research of prefabricated concrete structure.

Abstract: Based on Biot’s theory and the minimum potential energy principle as well as the thin plate theory, the superstructure, raft and soil are assumed to be a whole system according to the substructure method. The system must satisfy the continuity conditions at the interface between the superstructure, raft and soil surface. Considering the compatibility condition that the vertical displacement of the interface between the raft and the saturated soil should be equal, the integral equation accounting for the vertical coupling of the superstructure-raft system with the saturated soil subjected to a moving load is constructed. Using the numerical inverse transform technique, the forces and displacements of the superstructure, plate and saturated soil at any time are obtained. Some numerical results are presented to demonstrate the capacity of the proposed model. Also, the influence of load velocity on the superstructure will be investigated in this paper.

Abstract: The oxidation ditch sewage treatment comprehensive model was established on researching water transfer equation of triple oxidation ditch system and ASM1 （activated sludge mathematical model No.1). In addition, the model program is written by the MATLAB language, the results could be used for designing, simulating and optimized operating of the oxidation ditch system.

Abstract: This paper presents an method to solve the vertical deflection of the box beams with corrugated steel webs, considering both the shear lag and shear deformation of corrugated steel webs. The method is deduced by means of the variational principle. The formulas given by this method is simple and practical. Then, a comprehensive analysis on the effects of shear lag and shear deformation of corrugated steel webs is given for a simply supported box beam with corrugated steel webs under uniformly distributed. The results of vertical deflection obtained by this paper are in good agreement with those obtained by the finite element method (FEM) and the model test, respectively.

Abstract: In this paper, ANSYS/LS-DYNA which is a non-linear dynamic finite element software is applied to simulate the processes of two kinds of X-sandwich plate hit by a rigid sphere. Ultimate-ly the sandwich plate can be used to replace some components of the traditional steel protective dev-ices aimed at improving the overall crashworthiness performance of protective devices. This paper analyzes the influence of two plates on crashworthiness. And based on the comparison between the sandwich plates and the equivalent flat plate, the results from numerical simulation show that the X-sandwich panel can provide an excellent crashworthiness.Tight type of X-sandwich board is perfor-ms better than the discrete and ordinary steel plates, which can be applied to bridge protection device.

Abstract: Concrete filled steel tube (CFT) structure has advantages of the high tensile strength and ductility of steel in addition to the high compressive strength and stiffness of concrete. This research proposes a new CFT column-CFT beam frame structure. In order to validate the cost performance of the new CFT column-CFT beam frame structure, designs were carried out for building frames using both the new CFT column-CFT beam frame structure and conventional steel frame structure. The amount of consumed materials and cost estimations of each designed new CFT and conventional steel building frame are analyzed and compared. The result shows that the new CFT column-CFT beam frame structure is able to exhibit high cost performance than conventional steel frame structure.