Experimental Research On Vertical Bearing Capacity Of HR-EPS Module Composite Insulation Shear Wall

With the development of the society, the rapid development of science and technology, people begin to response to a call for national resources, began to pay attention to environmental protection, even is the recycling of resources. HR-EPS shear wall module of the construction industry as a rookie, is a major concern. It is in the polystyrene board configuration reasonable reinforced concrete vibration after the formation of the insulated wall. It on the basis of common wall further transformation, has both advantages of lightweight, high strength, energy conservation, environmental protection and so on, become the preferred material in the construction industry. Although a growing number of colleges and universities began to study of EPS insulation module shear wall, but so far on the wall of the mechanical characteristics, failure pattern, etc, also no systematic research results for reference. In view of this, this article will focus on the wall of the vertical bearing.Considering the eccentricity, reinforcement ratio, and the edge constraint component on the influence of the vertical ultimate bearing capacity of wall, design the 6 pieces of HR-EPS module insulation shear wall specimen and 1 piece of ordinary shear wall. The final test results and finite element simulation analysis result, this paper compares and analyzes the HR-EPS shear wall to do further analysis research. In order to more accurate on the vertical bearing capacity of experimental research, this paper designed the first test in 12 pieces of specifications for HR-EPS block compression experiment research, to verify the relevant assumptions, to make deduces the formula of bearing capacity is more convincing. This article mainly has carried on the following work:1) This paper designed 6 faces HR-EPS shear wall and 1 face common shear wall to study the reinforcement ratio, eccentricity, and constraint component such as influencing factors on the bearing capacity of the vertical impact. Through the comparative analysis between different factors:(1) Through the experimental analysis, improve the reinforcement ratio at the same time can improve the bearing capacity of the wall.(2) The eccentricity of the bearing capacity of the wall effect is very obvious, with the increase of eccentricity, bearing capacity of the wall to reduce, the more obvious. According to this article, the design of eccentricity, you can see that when the eccentricity e ≤100 mm, wall total cross-section compression; When eccentricity e ≥300 mm, the measuring point of concrete strain change speed change faster than when the eccentricity e <300 mm. Although the critical limit load, the deformation of the wall will increase sharply, but still belongs to the ductile.(3) Arranged component constraints, constraints can the neutral axis move up, delay wall cracking time and walls can bear higher loads.(4) By the load-displacement curves of compression members, the trends of pressure wall are consistent.2) Using the finite element software ABAQUS to HR-EPS shear wall module to establish related model, analysis shows that:(1) The use of finite element calculated results tally with the test results is roughly.(2) The finite element method of load-displacement curve, strain curve of concrete and steel concluded related curve was consistent with the experiment, and suggests that through the concrete constitutive relation to establish the model basically meet the requirements.3) For bearing capacity calculation formula of HR-EPS shear wall is derived, through the test HR-EPS block axial compression experiment, to verify the relevant assumptions, to make deduces the formula of bearing capacity is more convincing. Draws the following conclusions:(1) Because there are a core in the HR-EPS module, make the casting concrete is discontinuous, rib and core place easy to appear the phenomenon of stress concentration, cracks appeared in the stress concentration, but the final failure pattern similar to ordinary wall.(2) Through the contrast analysis of the bearing capacity of ordinary block HR-EPS concrete compressive strength reduction factor α =0.7.(3) Based on HR-EPS module with normal stress strain curve of the test block, this paper compares and analyzes the change trend of both.(4) During the test,there is no concrete ribs fell off the specimen, which indicates that the stability of wall is good.(5) Strain distribution of concrete on the same section follows the plane section. From the compressive strength test of HR-EPS block, we can know that stress-strain curves of concrete in HR-EPS module is basically consistent to the curve of ordinary concrete. Selecting plane and curve of concrete stress-strain assumption can make tress graphics of concrete in actual compression zone simplify to equivalent rectangular stress graphics.(6) Eccentric compression failure mode component of HR-EPS shear wall is consistent with the general. So, HR-EPS compressive calculation formula of shear walls can be based on the common shear wall structural form, only to 0.7 the reduction of wall thickness, the resulting formula of calculating is consistent with ordinary form of compression shear in form.