Method Of High-Rise Buildings Earthquake Response Analysis And Experiment Of RC Structures

With the development of our economy, a plenty of high-rise buildings have been built in many cities. They not only alleviated city to use a ground of situation of strain, but also beautified a city view. However, it also bring many new sophisticated topics for the aseismic researchers at the same time.It is very few to know the performance of structure under the big earthquake. How to carry on 3D seismic analysis of high structures greatly to satisfy the norm second stage anti- earthquake design request and how to evaluate the performance of high-rise buildings under big earthquake are the topics that have to solve.Take this as topic, this paper carried on three aspects of researches:1) according to the rule of equal displacement, studying relationship between elastic and inelastic responses of high structures under strong earthquake waves and then investigating systematically to make use of the possibility and the method that the former results of analysis estimate that of the latter; 2) Carrying on researches about inelastic analytical methods for high structures, and then putting forward an analytical model of shear wall based STM (Strut and Tie Model). Effects simulated by the model have been proved by making use of several examples. 3) Carrying on the shaking table test of a 19 story 1:10 scale R.C. frame-shear wall structure model and studying the performance of anti-earthquake, and then summarizing and analyzing the main results of test.In the thesis, the main contents and result studied are as follows.1. Studying the relationship between elastic and inelastic responses of high structures suffered from earthquake waves. Concretely, inputting 20 earthquake waves under different sites conditions that the maximum values of acceleration gradually increase from 0.01g to 0.8g and then carrying on several thousand calculation of elastic and inelastic time history responses of structures under intensities of earthquake. Results of computation and analysis show that inelastic responses of structures suffered from different intensities of earthquake are more or less than that of elastic responses. Concretely, the average entire drift ratios of inelastic response under different earthquake excitations are nearly equal to those of elastic responses. So it is completely feasible to estimate the former by the latter. The average inter story drifts of inelastic response approximately are equal to those of elastic responses in small and middle nonlinear stages. But in large nonlinear stage they are larger than those of elastic responses. According to the analysis above, the formula is provided for evaluation of inelastic inter story drifts based on elastic inter story drifts .Because of no applied analytical methods of inelastic response of high-rise suffered from strong seismic waves, the above-mentioned result provides for us a simple, applied method to estimate inelastic responses of structures.2. The STM (Strut and Tie Model) model is a kind of truss models made up of concrete strut, steel tie and concrete node. Based on STM, an analytical model of predigested strut and tie model for shear-wall is put forward. The new model is made up of edge bar (including concrete and steel link), inclined bar (including concrete and steel link) and limitless stiffness beam.There are three examples calculated by the predigested strut and tie model of shear-wall. They are elastic response of cantilever shear-wall under static load, inelastic response of 3 story shear wall under static load and time history response of the 19 story 1:10 scale R.C. frame shear-wall structural model suffered seismic waves. The results calculated by the predigested strut and tie model have close relevance to those of the three examples calculated, and can explain it possible to simulate shear-wall by the above-mention model.3. Carrying on a shaking table test of a 19 story 1:10 scale R.C. frame shear-wall structural model including 7 mode tests and 57 shaking tests, and obtaining a number of datum and results. The test provides us a lot of valuable results such as the relationship between the damage degree and maximum drifts etc. Analyzing causes of damage by comparing input with output datum, and synthetically assessing the anti-earthquake capacity of structure and bringing forward suggest of seismic design.