Elastic-Plastic Earthquake Response Analysis Of Reinforced Concrete Frame-Shear Wall Structures

The seismic code of buildings (GB50011-2001) of China requires that complex high-rise needs the analysis of elastic-plastic earthquake response. But there is not a proper way to process that analysis of elastic-plastic deformation of complex high-rise building and extra high-rise building to meet the safe needs.As reinforced concrete frame-shear wall structures are widely used in high-rise buildings now, the numerical simulation is an important way to analysis elastic-plastic earthquake response of R.C. structure. There are few kinds of the software, which can do the analysis. But most of the can only do the analysis with two-dimensional or pseudo-three-dimensional. As we know, the reinforced concrete frame-shear wall structures can not be simplified to two-dimensional problem, so the best way to solve the problem is setting a new three-dimensional model.It's very important to adopt proper shear wall model and hysteretic model when doing elastic-plastic earthquake response analysis of R.C. frame-shear wall structures. However the studies on the hysteretic relations and performances of shear-wall are much less than those of beams and columns, there isn't a perfect numerical model now. The traditional models such as macroscopic finite unit for R.C. frame-shear wall structures such as the models used in DRAIN-2D and IDARC-2D are difficult applied in three-dimensional. Fiber model and multi-spring model are considered to be promising models. The fiber model represents the interactions among axial load and bi-directional bending moments. Some mechanics feature of columns that take axial load can be showed well. Can the model work proper? What are the difference of the simulations effect between the better ones and the traditional ones? Whether can it be used to analysis on real structure? Problems given above are studied in this paper.The fiber model and the traditional model are all used in this thesis. Calculations were conducted to simulate two tests: (1) A shaking table test of a nine story 1:6 scale frame-shear wall building model was carried out.(2) one pseudo-dynamic test of a seven-story R.C. frame-wall prototype model, which was conducted by U.S.-Japan. After comparing the test results of top floor displacement, acceleration, base shear response and maximum story drift ratio, the simulation effect was evaluated. Based on the tests and simulations, the thesis gives a conclusion as follow: The simulation results which based on three-dimensional analysis of fiber model and two-dimension analysis simulated by IDARC-2D4.0 are very similar. The reliability and stability of them are very well. And the fact that the results of numerical simulation are similar to the one of experiment proves that numerical simulation can simulate the elastic-plastic earthquake response of R.C. structures in a good way. This is helpful to the research of the elastic-plastic earthquake response of R.C. structures.As more and more seismic damage we know, we recognize the fact that ground surface movements are multidimensional when earthquake happened. No matter the structures are symmetrical or unsymmetrical, they can be broken by torsion. So the traditional way that simplifying the 3-D structure to 2-D model and analyzing the elastic-plastic response in one direction can not reveal the innate character of earthquake response of R.C. structure. The most important problem scientists care about is the similarities and differences in the elastic-plastic earthquake response of R.C. structures between one-direction earthquake waves inputted and two-direction earthquake waves inputted.It is suggested that the analysis by multi-directional earthquake waves inputted is very important. The author used CANNY99, 3-D non-linear analyzing software, establish 3-D non-linear analyzing model to simulate a regular and symmetrical R.C. frame-shear wall building, process some elastic-plastic response analysis under the conditions of one-direction inputted and two-directions inputted. Comparing the results of top floor displacement, acceleration, base shear response, maximum story drift ratio, maximum story shear response and story torsion angle, the author draw a conclusion as follow: when the regular structures are under the conditions of one-direction wave inputted or two-direction inputted, maximum story displacement, maximum story shear response and maximum story drift ratio transform little. The time history responses of top floor displacement and acceleration are consistent each other under same conditions. There are some phenomenons which are worth to considering. The time history responses of top floor-torsion angle under two-direction inputted condition are greater than the ones under one-direction inputted condition. The style of earthquake wave has great influence upon the-torsion response.