The Seismic Behavior And Finite Element Analysis Of Steel Reinforced High Strength Concrete Short-Leg Shear Walls

Short-leg shear wall can not only meet the requirements of building use function and beautiful, but also can reasonably improve the seismic performance of small high-rise buildings, so it has been widely used in China. Compared with the common shear wall, the short leg shear wall has low bearing capacity, low lateral stiffness and seismic performance, which makes the application of the short leg shear wall is limited. In recent years, the engineering scholars put forward in ordinary reinforced concrete short leg shear wall with steel, steel and concealed bracing or use high strength concrete and other improved short pier shear wall by force performance measures and carries out the experiment research. But at present, there are few results. In this paper, a new type of steel reinforced high strength concrete (SRHC) short pier shear wall is proposed, which is used to improve the mechanical properties of short leg shear wall and to expand its scope of application.This paper designed 4 "—" shape steel reinforced high-strength concrete single short-pier shear wall specimens and 2 layers of steel reinforced high-strength concrete couple short limbed shear wall-beam specimens with different types of steel reinforcement and different compression ratios. Based on experiments under low cyclic loading, the load-carrying mechanics, failure mode, energy dissipation capacity and seismic behavior of the new structure were studied. Based on the experiment, the finite element software ABAQUS is used to analyze the seismic performance of SRHC short leg shear wall.Experimental results and finite element analysis show that:1. SRHC single short-leg short leg shear wall specimens are ductile failure. The bearing capacity is larger than ordinary reinforced concrete short-leg shear wall, but the ductility coefficient and the equivalent viscous damping coefficient are equivalent to the latter. With the increase of axial compression ratio, the horizontal bearing capacity of SRHC short-leg shear wall is increased, the ductility becomes worse, and the stiffness is increased. Compared to the lattice member, the hysteresis curve of the full-web type steel members is more full, the ductility is better, and the energy dissipation capacity is greater.2. SRHC double short-limb shear wall has two seismic fortification lines. One is the plastic hinge at both ends of beams dissipate seismic energy. The second is the appearance of plastic hinge at the bottom of the wall. When the beam ductility is very well, the structure performs well in ductility and energy dissipation. SRHC short-leg shear wall structure has strong energy dissipation capacity and good seismic performance.3. The hysteretic curves and skeleton curves of the specimens obtained from the finite element simulation analysis are in good agreement with the experimental results. The results of finite element analysis show that:Compared to the lattice member, the ductility and load-bearing mechanism of the full-web type steel members is better. In a certain range, with the increase of the axial compression ratio and the strength of concrete, the bearing capacity of the specimens is significantly improved, and the ductility performance becomes worse. It has no significant impact on the overall performance of shear wall by adjusting the distance between walls as well as changing the linking beam span-depth ratio. The bearing capacity of the specimens is greatly improved, and the initial stiffness is also increased slightly by decreasing shear-span ratio. Steel reinforced concrete coupling beams have better performance by the time span-depth ratio between 2.0-3.0. Compared with reinforced concrete coupling beams and full-web type steel beam, adopting solid web steel reinforced concrete coupling beam can get higher bearing force, good energy dissipation capacity, especially the ductility can be improved greatly.