Safety Analysis Of The Supported Dome Support Structure

The performance of the string-supported dome structure may be affected during the service period due to maintenance,functional modification,performance degradation and other reasons.As a kind of economical and efficient space structure,the string support dome structure is mainly used in large-span buildings.Generally,it has a high safety level requirement.How to evaluate the safety performance of the inservice string support dome structure reasonably and accurately.Determining the reliability of the structure in subsequent use has important practical implications.Due to the functional transformation,the Jinan Olympic Sports Center Gymnasium caused a large change in the local load of the string-supported dome structure,and it was necessary to judge its influence on the safety of the subsequent use of the structure.This article is the research object,the main research content and work are as follows:The finite element analysis model of the chord-supported dome structure is established by ANSYS.According to the consistent defect modal method,the static analysis,eigenvalue buckling analysis and nonlinear buckling analysis of the inservice string-supported dome structure are carried out,and the structure is obtained under different initial defects.The load-displacement curve analyzes the effect of the initial imperfection on the overall stability of the string-supported dome structure.According to the performance characteristics and reliability theory of the stringsupported dome structure,considering the uncertainty of the geometrical dimensions,material properties,loads,etc.,the probability distribution model of each parameter is determined,and it is introduced as a random variable into the string-supported dome structure to establish randomness.The string-supported dome structure model establishes the basis for reliability analysis.Combined with the parameter sensitivity theory and the distribution characteristics of each parameter,the Monte Carlo simulation method is used to analyze the parameters sensitivity of the three failure modes of the overall failure,deflection failure and member strength failure of the string-supported dome structure.The elastic modulus of steel is a parameter that has a great influence on structural reliability.Based on the Monte Carlo simulation method,the probability density function,the distribution function of the structural stability coefficient,the maximum displacement of the joint and the maximum internal force of the member are obtained by random sampling calculation,and the three failures of the structure in overall stability,deflection failure and strength failure of the member are obtained.The failure probability in the mode determines the overall instability of the structure as the main failure mode of the structure.The maximum failure probability of the structure does not exceed the current design standards.The increase of the structural local load caused by the functional transformation of the Jinan Olympic Sports Center Stadium does not affect the reliable use of the structure during subsequent use.