ANSYS Analysis And Regularity Distribution Study Of Internal Force On Short-shear Wall Structure System

Short-limbed wall (SLW) is defined as the shear wall with a ratio of section depth to width (RDW) being 5-8. Usually, the section width is 200-250 mm, and the depth is between 1000 and 2500 mm. It is an intergradation structure style between erose-section-column frame and convention shear wall structure. This kind of structure form bases on convention shear wall structure and draws on the advantage of framework. So it has become the most important structure form for residence projects with 20-30 stories.Nowadays the SLW structure is widely used for its versatile advantages on architecture and Structure mechanism in residence projects all over the country. But it is short of enough experimental and theoretic bases, which cumbers SLW' s healthy development. Moreover, even the newly promulgated National Code on Reinforced Concrete Structure gives no items on SLW design, and no previous horizontal cyclic loading experiments on SLW structure has ever been published domestic or oversea. In this paper, a two dimensional nonlinear FEA(finite element analysis) of SLW under monotonic loading is studied so as to discover the internal force regularity distribution of SLW. The main achievements of the dissertation are listed as following.1 According to tall residential system' s development and SLW' s feature which is compared with some typical framework structures and convention shear wall structures, SLW structure is clarified to be the most important structure form for residence projects with 20-30 stories. A state-of-the-art on nonlinear FEM is retrieved, and the constitutional relationship be adopted according to the intention of analysis.2 Horizontal cyclic loading experiments are carried out on six specimens, which are divided into two groups: one with flanged-wall, and the other without. The two groups consist of 3 specimens each, and RDWs are 5, 5.6 and 8 respectively. The specimens are all in the forms of "pseudo-structure", rather than the commonly used specimens that are in the form of "member" , and the experiment results are inevitable more reasonable.3 Based on the cyclic reversed loading experiment, six SLW specimens are computed and analyzed and some comparison was done between results of experiment and computation. nonlinear FEA of the six SLW specimens under monotonic loading is studied. According to the analysis, the specimens' s destructive fissure cloud of stress and hysteretic curve are shown to be in good agreement.4 Using the nonlinear finite element program of the best model, two groups of model specimens are calculated with different axial compression ratio and span-depth ratio. The internal force distribution strain curve and hysteretic curve in failure process. At last, the influence of span-depth ratio and axial compression ratio to internal force distribution are obtained.