Study On Seismic Behavior Of Low Reinforcement Of Multi-storey Residential Shear Walls With Opening In Six Degree Zone

Reinforced concrete shear walls are widely used in the high-rise buildings at present time. However, the current design methods for shear wall which are recommended in the existing codes including Code for design of concrete structures, Technical specification for concrete structures of tall building and Code for seismic design of buildings, mainly aim at the high-rise buildings. With the improvement of people's living standards, there are larger market demands for multi-storey shear wall structures. However, the existing design specifications for multi-storey residential structures in the low seismic intensity area may lead to extra reinforcement.At the moment, how to adopt reasonable and economic reinforcement form in six degree of earthquake zone is not involved in the related research, so it's necessary to do careful research. This paper tries to adopt a low reinforcement scheme in the shear wall which is suitable for low-rise residential structures in the low seismic intensity area, and also take related experimental study and finite element analysis. In this subject, our team completed ten seismic tests of low-reinforced-wall components.Main contributions of this paper:â‘ First make research on the seismic behavior of the low-rise shear wall and the coupled shear walls. It includes one overall wall and one shear wall with small opening whose shear span ratio is 1.2; two coupling beams in coupled shear walls whose span-depth rations are respectively 1.0 and 2.0. The reinforcement rations in the relevant tests are lower than the minimum reinforcement ratio of the design specification. Through experimental research, systematically analyses each specimen's carrying capacity, rigidity, decay process and also ductility, hysteretic behavior, energy dissipation, damage characteristics, and failure mechanism.â‘¡Based on the experiment, take the ABAQUS finite element analysis to simulate these ten components under monotonic loading, then compared analytical results with experimental results, including the development of damage, destruction, and also the load-displacement curve.â‘¢Based on the testing and analysis, propose seismic design suggestions and detailing measures for the low-reinforced shear walls of multi-storey residential structures in the six degree of earthquake zone.Main conclusions of the study:1)In the seismic design, it's important to design the span-depth ratio of coupling beam reasonably, determine the relative strength between coupling beams and wall limbs, and handle the boundary structural reinforcement's contribution to the bending and distributing bars'contribution to the shear. As long as it's reasonably designed, the low-reinforced shear walls can be applied in the multi-storey residential structures in the six degree of earthquake zone.2)When it comes to the coupled shear wall, although it's damaged in shear, rational design with coupling beams can meet the elastic-plastic story drift angle requirements which is provided by Technical specification for concrete structures of tall building. Our team adopted the FW-EPA program through nonlinear dynamic response analysis to calculate the structural deformation under inputting some large seismic waves. It turns out that the multi-storey residential structures'requirements for deformation is relatively low. Based on the completed tests about low-reinforced walls, we can reach a conclusion that when it's damaged, its ductility can meet the limited requirements of current code and nonlinear dynamic analysis.The related research can offer reference to the amendments of the national and local design standards.