The Experimental Research For Safety Assessment Of RC Shear Wall Structure After Earthquakes

To give a quickly assessment for post-earthquake structures were important for emergency rescue and loss evaluation. At present, the damage identification of buildings in our country is mainly based on the experience of the experts. Such an assessment method will inevitably lead to the differences in the subjective understanding of the degree of structural damage caused by the identification of the structural damage. Due to the limited number of experts, for large-scale safety appraisal of buildings after the earthquake were pronounced.In order to solve this problem, this paper presents a new method for safety identification of reinforced concrete shear wall structures based on damage index. The group summarizes a set of practical new method for safety appraisal of reinforced concrete structure after earthquake. The method is based on a large number of quasi static test on structures, building damage phenomenon and the corresponding relationship of damage index, to establish "injury atlas", the referees on earthquake field who can according to the corresponding component damage phenomenon on atlas for the component and give a damage index, so as to calculate the overall structural damage index, and determine the damage level of buildings, and giving a conclusion.In this paper, reinforced concrete shear wall structure as the research object, mainly were studied as follows:1) Design 7 shear walls and 4 coupling beams in combination with the engineering practice, for its quasi static test, it is concluded that the components under different design parameters of the hysteresis curve, skeleton curve, under different design parameters for each component of ductility, energy dissipation, stiffness degradation, seismic performance is analyzed.2) In the process of quasi static test, using a camera to record the damage phenomenon under each control displacement for each components, record the damage phenomenon on concrete surface and the mortar surface, the modified Park-Ang damage index, is calculated under various control displacement. To research the corresponding connection between macroscopic damage phenomenon of components and the damage index, and the building the atlas for earthquake damage assessment for workers refer to establish damage.3) Research on the method of determine the overall structure damage base on the component damage. Set up a method of calculation the overall structural damage index based on shear wall and coupling beam component damage index. Due to the actual shear wall structure seismic damage phenomenon photos for component is difficult to find, the writer simulated a whole 6 layer shear wall test conducted by the team member before. And use the SketchUp and PS software to modeling the actual photo of the test and the simulated structure to validate the rationality and accuracy of this method.