| In recent years, the earthquake occurs frequently on a global scale, which brings the seismic performance a great challenge. As the most commonly lateral resistant core component of the multi-storey and high-rise building structure, shear wall, the seismic performance of which has direct impact on the structural integrity. So the problem that developing good seismic performance shear walls is always a hot issue to be solved for increasing the seismic performance in civil engineering. The object of this paper is to develop a kind of shear wall structure, the composite shear wall structure with thermal insulation formwork, which is based on the anti-seismic structure control. This kind of structure adopts the thermal-preservation blocks of glazed hollow bead to be permanent formworks to achieve the heat preservation and load-bearing integration. As a matter of structural system, it may transfer the original shear wall failure mode to the ductility destruction for improving structural anti-seismic capacity. This system overcome some defects of traditional shear walls, for example slow construction, big stiffness, big weight, poor insulation, poor deformation and so on. It also can improve the safety, durability and comfort of the residence, even can bring obviously economic efficiency.The composite shear wall structure was systematically studied in this dissertation by the combination method of the sub-assemblage loading test and ABAQUS finite element analysis.The main work in thesis can be summarized as follows:1.This paper taked the samll shear-span ratio composite shear wall as research subject and discusses it from some aspects including the bearing capacity, the ductility, the stiffness and its decaying process, the hysteretic characteristics, the energy dissipation and the failure feature, which were compared with traditional shear walls by the combination method of the sub-assemblage loading test.2. Applying the finite software ABAQUS build finite element model of the composite shear wall structure with thermal insulation formwork and usual shear wall and make nonlinear finite element analysis.Finite elements results agree well with experimental results, it is provided the basis for expand analysis.The research result demonstrated that the ultimate load capacity of the composite shear wall system with thermal insulation formwork decreased about2.47%and the initial stiffness was about71%of the common shear wall, but the attenuation coefficient (3uy increased by58.1%when yielding to the ultimate bearing failure, and the later stiffness was stable.In the energy dissipation capacity, the composite shear wall hysteresis loops was relatively full. It showed its better energy dissipation capacity which was1.64times than the traditional shear wall. Compared with the traditional shear wall, the seismic performance of the composite shear wall was significantly improved, and the ductility coefficient increased by43.6%.In the failure mode, composite share wall belongs to bending ductile fracture, and after reaching to the ultimate bearing capacity, it will not break immediately but break lingeringly; while the common share wall belongs to sharing brittle fracture.Analysis of finite element analysis software ABAQUS obtained:the numerical load-displacement curve and the skeleton curve agree well with the experimental cur, but the errors of the ultimate load and the limit displacement was bigger. |
PDF Full Text Request