Seismic Behavior Test And Nonlinear Analysis Of A SRC Frame-tube Hybrid Tall Structure

In order to verify the feasibility of constructing SRC frame-tube tall hybrid structure in earthquake zone, a model shaking table test, a field test and nonlinear dynamic time-history analysis were carried out on the LG-Beijing Tower to investigate its seismic responses and thus evaluate its seismic behavior in this thesis. The main contents include as following:1. First the CANNY2005, a nonlinear finite element program based on fiber model, was used to analyze the influence of steel embedded ratio and axial pressure ratio on the bearing capacity and ductility of SRC columns used in practical engineering and some suggestion was given for application. In this section, efforts were also emphasized on studying the acting mechanism of steel embedded in shear wall and its influence on the seismic behavior by analyzing data obtained from cyclic reverse loading test of SRC walls.2. By analyzing data obtained from low frequency cyclic reverse loading test carried out by Beijing University of Technology on steel beam-SRC column frame joints and two-direction-load tests on the single plate framing connections between truss-steel beam and concrete walls respectively, the seismic behavior of these joints and connections were evaluated and the influencing factors were studied. Based on above-mentioned research work, the determining methods of designing load for these connections were put forward consequently.3. A shaking table test of a 1/20 scale model of the single tower of LG-Beijing building was carried out. The model's dynamic properties, damp ratio and responses of acceleration and deformation were studied. Its dynamic behavior, cracking pattern and failure mechanism were discussed as well. Then according to the model test results, the seismic response of the prototype was evaluated. Both the test and analytical results show that the prototype has a rational arrangement of structural elements and better seismic behavior. It was able to survive different earthquake levels designed for. Finally, some suggestions for the design of the structure were put forward.4. A computing model of the test structure was built up by using program Strand7 and then nonlinear dynamic time-history analysis was carried out in some cases relative to used in shaking table test. By comparing calculating results with what...