高耸塔架结构节点损伤的指标分析与反分析两步诊断法

针对高耸钢塔架结构的损伤特点，建立了具有节点损伤的有限元模型，提出了一种指标分析与反分析两步诊断法：第一步，通过对节点残余力向量指标进行分析来确定结构可能损伤杆件的位置；第二步，把可能损伤的杆件的损伤因子作为设计变量，以损伤前后的杆端应变模态差向量的2范数作为目标函数，应用改进的混合遗传算法进行反分析运算，最终得到具体的损伤节点位置处的损伤程度．通过对一平面塔架结构的数值仿真分析表明，在理论上该方法是可行的．

Two-step Detection Approach to Joint Damage in High-rise Tower Structures by Index Analysis and Reverse Analysis

The finite element model of joint damaged structure is set up according to the damaging characteristic of high rise steel tower structure. A two step detection approach of joint residual force analysis and reverse analysis is presented. The first step identifies the location of the possible damaged poles by analyzing the joint residual force vector. The second step looks on the damage factor of the possible damaged poles as design vector, the 2 norm of the difference of the rod end strain mode vector between the intact and damaged structure as the target function, and uses the hybrid genetic algorithm to do reverse analysis, gains the damage degree of specific damaged joint at last. Performance of the proposed damage detection approach is demonstrated with analysis of a plane tower structure. The result shows that this approach is feasible in theory.