Experimental Study On Axial-flexural Behavior Of Shear Walls With Steel Tube-confined High Performance Concrete

As a main lateral load resisting structural member, concrete shear wall is playing animportant role in the high-building, especially in the super high rise building. To studyaxial-flexural behavior of shear walls with steel tube-confined high performance concrete(STCHPC) embedded in the whole section, compression bending tests on eight STCHPCshear wall specimens were conducted. The test results indicate that the failure mode of thespecimens is the axial-flexural failure, with crushing of toe concrete out of steel tubes. Thenbased on the experimental results, the nonlinear analysis is carried out using the ABAQUSfinite element analysis (FEA) program. The main achievements of the dissertation are listedas following:1)Through the tests of eight STCHPC shear wall specimens, the seismic performanceis investigated. The influence of concrete strength grade，axial compression ratio，steel ratio，section form etc on the load-deformation response of the STCHPC shear wall has beenexplored deeply.2)Seismic behavior such as failure pattern, hysteretic characteristics, displacementductility ratio, rigidity degeneration and dissipative coefficient etc were investigated atferthe tests. The results show that the bearing capacity and seismic behavior of the shear wallsare significantly improved with embedded STCHPC.3) Based on the experimental results, the nonlinear FEA sotfware ABAQUS is used toset up the mechanical model of the shear wall specimens and the monotonic loading processis simulated. Theoretical results and the experimental results are contrasted mutually. Theresults show that theoretical curve and the experimental curve are in good agreement.4) Based on the test and FEA results, axial-flexural capacity formula for STCHPCwalls was proposed, which is in good agreement with experimental results, andhas a larger safety margin, it is reasonable and reliable.In this paper, research results will supply experimental data and theoretical basis forseismic-bearing capacity calculation and design method of the shear walls with STCHPC.The research is of great significance for engineering design and practice.