Experiment Research On Mechanical Behavior Of Structure And Joint Of Short Limb Shear Wall Under Vertical Loads

Short Limb Shear wall is a component to resist lateral force between the special-shaped column and the Shear wall They formed the Short Limb Shear wall structure,which combines the advantages of frame structure and shear wall structure.Unlike the frame structure have column which outstand the of wall,The Short Limb Shear wall structure is very suitable office and domestic and commercial buildings.So,nowadays it is one of widely used structural system of high-rise building structure.For the past few years,Scholars at home and abroad did a lot of work on short limb shear wall structure,got some valuable theory.But most of the research content focused on the shear and seismic performance of the short shear wall structure under horizontal load.There are few Research on mechanical properties of using integral structure model of short limb shear wall structure under vertical load.This article describes that applied vertical uniformly distributed load on the short shear wall structure to study the mechanical performance of structure.Combined with model test results and finite element numerical analysis method,to finish the further study on mechanical properties and deformation characteristics of wall limb joint.Mainly finished the following work;With a practical short shear wall structure as the background,to simplify the structure which Selected from three layer structure nearby the top,combining with the similarity principle of structure model test,model test with three layer two across of short limb shear wall structure was made according to the scale of 1:4 ratio.With stack method was used to simulate the uniformly distributed load,experimenting the model of the structure under the vertical load.Analyzed the deformation and stress of each component of short limb shear wall structure,to preliminary understanding the mechanical property of short limb shear wall structure under vertical load,provided the basis for further research.The tests showed that under the vertical uniform load,the deformation of short shear wall structure with cast-in-place concrete characteristics is similar to the frame structure.The short shear wall structure with cast-in-place concrete present a good bearing capacity,the position which connected beam and joint of short shear wall structure is the weak area of short limb shear wall structure.By analyzing the strain of longitudinal reinforcement of joint of wall under the vertical uniform load know that the area of joint of wall show a composite state of the stress with pressure and bending.Established a spatial model which is exactly similar to the testing model using the finite element software—ANSYS,compared the finite element calculation results with the test results to verify the rationality of the finite element analysis model.And analyzes the structure of the distribution of the stress and development of the fracture during the entire Process which Starting From the beginning loading to the final destruction of the system of short shear wall structure.Combined with the load stress nephogram of core zone of joint under the vertical load and related date,expounded the process of stress,failure under vertical load.Established the finite element analysis model of T-shape joints,analysis the condition of the overall deformation,cracks and steel bar stress and strain of the model of T-joints under the vertical uniform load.To research and analysis the impact that the bearing capacity and crack resistance of Short shear wall from the various parameters With strength grade of concrete ratio of longitudinal bar and ratio of stirrup as the parameters.Summarized the calculation formula of the dangerous section in the core zone of joint.Combination with relevant data and the analysis of the force performance of short limb shear wall structure under vertical load above the article,summarized some common questions that arose during design of short shear wall structure,and poposed corresponding improvement suggestion.