The Analysis On Small Seismic Performance Of Light Weight Aggregate Concrete Tall Building Structures

With the development of economy and the progress of technology, the improvement of the quality of light weight aggregate, tall building structures with the construction of light weight aggregate concrete increase year by year. The structural systems are becoming more various, the various structural systems have the emblematical behaviors and the corresponding methods, seismic performance of structures are different, the concerned problems are also different during the design. Light weight aggregate concrete is provided of lightweight and low elasticity modulus, it is necessary for the quantitative analysis of the structural systems of light weight aggregate concrete and reinforced concrete in the seismic performance. The major work includes the following:(1) On the condition of the equal cross-section, formula based on the bottom of the shear method is derived, some quantitative results of frame structures after materials replacement for lateral drift, seismic load response, and the period of structure vibration are presented according to the model analysis of data.(2) Determine the optimum light weight aggregate concrete strength grade and aggregate density level according to the varying intensity of the model data analysis, the way to solve the large lateral drift of light weight aggregate concrete frame structures was brought out.(3) Based on the principle of continuous analysis of the interactive frame-shear wall structures, and the equation of equilibrium for the rigid connection system of the frame-shear structures in consideration of the shear deformation of the shear wall, according to the current codes, a series of formulas for the rigid connection system for lateral drift angle were deduced strictly, some quantitative results and formulas of frame-shear wall structures after materials replacement for lateral drift are presented too.(4) Equation of equilibrium for the hinge connection system of the frame-shear structures in consideration of axial deformation of side columns was established, the influence of the axial deformation of side columns to the lateral drift, seismic load response, and the moments of shear walls was discussed, a simple formula after materials replacement for lateral drift is presented.(5) The main factors such as wall length, concrete grade parameters and aggregate density level, which control and influence the behavior of the structures, are incorporated into the shear wall structure mechanical model, and some quantitative results before and after materials replacement for seismic load response, the period of structure vibration, and lateral drift angle are presented, and it was discussed how to choose the wall length.