Study On Elasto-plastic Behavior Of Frame-core Wall Hybrid Structure Under Bi-directional Horizontal Earthquakes

In recent years, the rapid development of high-rise buildings in China, has thefollowing characteristics: building height increasing, increasingly complex structureshape, with mixing, composite structure is given priority to. At the same time, anotherfeature of high-rise buildings in our country is: the use of steel frame or steel reinforcedconcrete frame with concrete frame-core wall structure consisting of core tube graduallyincreased. Seismic strong motion observation shows that the earthquake ground motioncan be decomposed into six components, namely three translational and three rotationalcomponents. Because of the complexity of the current level of observation, a lot ofresearch conducted on one-way horizontal earthquake action, the results have arelatively consistent approval, but for structure responses under bi-directional horizontalseismic action research is less.Closely combined with the reality of our country, this article put a high-rise steelreinforced concrete frame-concrete core wall structure as the research object, usingPKPM2010software to design the structure, and combined Etabs software to establishthe structure finite element model, then import the geometry information of model intoPerform3D software, select the appropriate seismic waves, under the action of single,bi-directional horizontal earthquake of elastic and elasto-plastic performance research.Through structure elastic performance research, indicate bi-directional seismic inputpeak horizontal displacement is about1.2times than one-way input and one-way inter-story drift results earthquake significantly increased bidirectional earthquake is1.4times the one-way action. Through structure elasto-plastic performance research, thevertex level displacement under bi-directional excitation is1.2~1.3times of one-wayinput, inter story displacement angle is1.2~1.35times the one-way input under bi- directional seismic structure, advance into the plastic state, and beyond the elasto-plasticinter story displacement angle1/100limit value. Through research on the shear stressdistribution on the frame-core wall hybrid structure under rare earthquake, show thatshear frame column under bi-directional excitation sharing1.2times underunidirectional seismic base shear, single, double shear wall under earthquake X to sharethe overall trend along the floor in the same direction, the bottom shear wall shareabove the base shear90%, gradually decreases with increasing shear rate increasing theheight of the shear wall in the structure of share, the top wall still share the base shear15%. By comparing a single, bi-directional energy distribution under earthquake,earthquake showed bidirectional, unidirectional earthquake compared to plasticdeformation under increased significantly longer than non-linear structure into the wayahead of the earthquake.