Calibration Of The Modeling Approach Of Shear Wall And Seismic Response Analysis Of Frame-Wall Structure

As the main load-bearing component of the structural system of high-rise building,shear wall owns the characteristics of large lateral stiffness and favorable seismicproperty, what’s more, its force-deformation behavior has a direct impact on theperformance of the whole structure. Considering the test would cost excessively, itproves that the modeling of shear wall has significance of far-reaching in the field ofcivil engineering research today.Basing on related study on shear wall models abroad, as well as relying onstructural nonlinear analysis simulation platform of OpenSEES, the author focuses onthe following aspects:Firstly, the author conducts comprehensive comparison of theoretical differences ofthe three selected shear wall modeling approaches. For the sake of investigatingsimilarities and differences of the modeling approaches above, the author develops adiscussion of preliminary on the proposing of the modeling means, underlyingassumptions in the models, selection of the constitutive material relations and numericalimplementation of the modeling approaches and so on.Secondly, the author calibrates the effectiveness of the selected modelingapproaches according to existed test results of shear walls under low cyclic loading.Besides contrasting the accuracy of the simulating consequences, the author alsoinvestigates the influence of number of integral points and discretized elements on thesimulation results and the computational efficiency, so as to choose a kind of modelingapproach with optimized capacity for the simulation.Thirdly, the author carries on comparative analysis of a high-rise spatial frame-wallstructure under rare earthquake in the platform of OpenSEES. Due to the checking ofavailability and stability of selected shear wall models, the author applies three distinctmodeling methods to model the shear walls in the structure and then proceedinganalysis of nonlinear response of the walls and the whole structure with differentmodeling methods.In this paper, the author achieves the following conclusions:①On one hand, for the simulation of shear walls with relative lowshear-span-ratio (2.0), the author recommends the applying of fiber model withsection nonlinear shear modeling, for the application of force-based nonlinear beam-column element would reach results of obviously distortion; On the other hand,for the simulation of shear walls with middle-to-high shear-span-ratio (2.0), the twomodeling approaches above would be equally suitable. In addition, the author also testand verify the effectiveness of displacement-based shear-flexure interactionbeam-column element for the simulation of monotonic force-deformation curve of shearwalls with creativity.②For the modeling of shear walls, increasing the number of integral points anddiscretized elements would not significantly improve the results of simulation while theapplying of force-based nonlinear beam-column element and fiber model with sectionnonlinear shear modeling; Furthermore, contrasting to increasing the number of integralpoints in the analysis, distretizing the walls into more elements would aggravate the costof program operation more remarkably. Therefore, the author suggests that one elementwith four integral points can be used in the modeling of shear walls for the twomodeling approaches above, which would meet accuracy and effectiveness for thesimulation.③Through strong seismic analysis on a high-rise spatial frame-wall structureusing different modeling methods for the shear walls, the author discovers that it wouldoverestimate the flexural deformation of the structure, underestimate the shear capacityof frames and the damage of the whole structure if all the walls were simulated withforce-based nonlinear beam-column elements; On the contrary, appropriate selection offiber model with section nonlinear shear modeling would reflect the response of thebuilding during the rare earthquake more realistic, such as damage of the structure,degradation of strength, deterioration of stiffness and pinching effect of the shear walls.