Elastoplastic Analysis Of High-rise Frame Structures Based On Fiber Model

With the rapid development of social economy,the number of high-rise buildings is increasing rapidly.The design of high-rise structures has brought challenges to engineers,and the importance of seismic design is becoming more and more obvious.At present,the research related to the dynamic response of reinforced concrete structures under earthquake action has been more comprehensive,but there is still little research on the dynamic behavior of reinforced stirrups on structures under earthquake action.According to the actual reinforcement of the structure and the requirements of the code,the actual structure is numerically simulated and analyzed.The main research contents are as follows:(1)According to the modified Kent-Park model and Clough model,the subprogram module of concrete and steel bar material that can consider the restraint effect of stirrup and stiffness degradation was developed using FORTRAN language.Simulation and numerical results verify the accuracy and reliability of the VUMAT subroutine module for structural dynamic analysis.(2)Using fiber model and common node technology,the four-layer reinforced concrete frame structure was established according to the experimental design,and the same reciprocating load was applied to the structure.The error between the finite element simulation and the basic period T1 measured by the experiment was only 5.11%,which can be seen The dynamic characteristics of the finite element model and the test model are basically the same,and the simulation analysis is consistent with the measured time-history curve trend and the peak value is relatively consistent.Therefore,this method can be used in the dynamic response analysis of the reinforced concrete structure under the action of earthquake.(3)According to the construction drawings,according to the actual situation of structural reinforcement arrangement and stirrup encryption location,the above method was applied to a 16-story plane irregular reinforced concrete frame structure in ABAQUS software to establish a finite element model,and the peak acceleration and The effect of loading direction on the seismic performance of the structure considering the encryption stirrups.