Analysis On Earthquake Failure Of Reinforced Concrete Frames Structures

In the multi-story and high-rise building structure,reinforced concrete frame structure accounts for more than 30% of the total building,especially the shopping malls,schools,hospitals and other public buildings mostly use the frame structure,In the seismic fortification area,the frame structure is one of the main structural forms.In recent years,the collapse of the frame structure in the earthquake process,so that the seismic performance of the frame structure with a further understanding.In order to reduce the earthquake collapse of the lives and property of the menace,do a good job building earthquake fortification is the most important and most effective means.In this paper,the influence of the stiffness of the bottom structure on the aseismic behavior of the whole structure is studied.The seismic behavior of the structure is evaluated by ANSYS finite element software by calculating and analyzing the vibration period and frequency,floor displacement.The modal analysis shows that the mode shapes of several post-column structures are not changed greatly,but the influence on the higher-order modes is relatively obvious.The results of time history analysis show that the displacement of the structure floors under the action of multiple earthquakes is increased when the cross-sectional dimension of the bottom frame frame is reduced.This shows that a significant reduction in the lateral stiffness of the bottom side is detrimental to the structural resilience of the aseismic collapse.Under the action of rare earthquakes,the frame structure enters into the plastic deformation stage.As the lateral stiffness decreases,the interlayer displacement and the interlayer displacement angle gradually increase,and the top layer decreases with the lateral stiffness,The interlayer displacement and the interlayer displacement angle decreasegradually.When the limit of the maximum interlayer displacement angle is reduced to the specification,the structure has potential safety problems.The results show that the anti-lateral stiffness of the bottom frame plays an important role in the anti-seismic capacity of the whole frame structure,and the seismic collapse capacity of the frame structure can be improved effectively by changing the number of the columns and the sectional dimension.