Shape Optimization Of Lattice Wall Section And Comparative Analysis Of Seismic Performance Of Structure

The traditional circular cement polystyrene membrane shell lattice concrete wall structure has the problems of stress concentration in the joint part and difficulty in the reinforcement distribution in the construction process.To solve the problems,the section shape and reinforcement ratio of lattice beam and lattice column in the wall are changed to improve the mechanical performance of the wall.Under the action of different axial compression ratio and reinforcement ratio,the finite element numerical simulation of the two kinds of walls is compared and analyzed,and it is concluded that the improved wall structure has better seismic performance than the traditional wall structure.The main work of this paper is as follows:(1)By material mechanics,elastic-plastic mechanics makes formula deduction,draw a square cross-section beams in normal section flexural and under the condition of vertical and horizontal bending,across different maximum normal stress is less than in the circular cross section in the maximum normal stress,the rectangular section beam and circular cross-section beam and the plastic zone size phase at the same time,the rectangular section beam in the plastic stage under bending moment than the circular cross section of the beam,The maximum bending moment of a beam with circular section is larger than that of a beam with square section.(2)By using ABAQUS software to carry out finite element simulation analysis on wall joints with circular section and wall joints with square section under the same cross-sectional area,the concrete damage state of the wall joints is obtained,and the comparative analysis of the results of the two sections shows that the damage coefficient of the square joints is less than that of the circular joints.(3)The finite element analysis of 8 groups of concrete lattice wall specimens with two kinds of section forms was carried out by ABAQUS software.By changing the axial compression ratio,the vertical force and horizontal reciprocating load on the wall,the extract of each wall,hysteresis curve,skeleton curve,stiffness and ductility,study the influence of different parameters on the two kinds of cross section of wall,and comparing with the results of analysis,draw a square cross section wall ultimate load,stiffness and ductility coefficient were greater than the circular cross section of the wall.(4)Through ANSYS software,the finite element analysis of 28 groups of two types of section lattice wall is carried out.The frequency,period and damping coefficient of the natural vibration of the structure are obtained by modal analysis.By changing three kinds of seismic waves and four kinds of reinforcement ratio,the time-history analysis of the building is carried out to extract the peak acceleration,acceleration amplification coefficient,inter-storey displacement,inter-storey displacement Angle and maximum shear stress of each building.The influence of different parameters on the whole building is studied,and the results are compared and analyzed.It is concluded that the seismic performance of the square wall structure is better than that of the round wall structure,and the optimal reinforcement ratio is obtained.There are 59 figures,18 tables and 54 references in this paper.