| Reinforced concrete structure is widely used in all kinds of buildings,but there are still problems to be studied.The earthquake disaster shows that people’s understanding of the dynamic elastic-plastic response of the structure is not deep enough,the analysis means are rough and the calculation process is complex,which makes it difficult for the engineering design to accurately grasp the failure mode of the structure.Therefore,it is of great theoretical significance and practical value to seek an efficient and convenient dynamic elastic-plastic simplified analysis method of reinforced concrete structure and serve engineering design.The main research contents are as follows.The yield moment of reinforced concrete beam and column members is deduced and simulated by using the section fiber finite element software xtract.By comparing the derivation results,relevant literature and xtract results,a reasonable beam yield moment formula is selected and the column yield moment formula under ideal elastoplasticity is given.Based on the energy principle,the stiffness reduction coefficient of beam and column is calculated,and the simplified elastic-plastic analysis method of reinforced concrete frame structure is proposed.Taking two irregular reinforced concrete frame structures with fortification intensity of 7(0.1g)and earthquake group as group II and class III sites,the dynamic elastoplastic simplified analysis is carried out,and compared with the corresponding dynamic elastoplastic time history analysis results to verify the applicability of the simplified analysis method.Based on the assumption of shear wall bending failure,40 wall limbs are simulated and analyzed by xtract software,the calculation formula of wall limb yield moment of ideal elastic-plastic material is given,and the elastic-plastic simplified analysis method of shear wall structure is put forward.Taking the concrete shear wall structure with fortification intensity of 8(0.2g),seismic grouping group II and class III sites as an example,the dynamic elastoplastic simplified calculation is carried out,and compared with the dynamic elastoplastic time history analysis results to verify the applicability of this method to the shear wall structure.This paper further studies the elastic-plastic simplified analysis method of reinforced concrete frame structure,discusses the reasons for the deviation from the elastic-plastic time history analysis results,and puts forward reasonable improvement suggestions according to the influencing factors such as damping ratio and response spectrum. |
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