锅炉钢框架的抗震加固设计与分析
Seismic Strengthening Design and Analysis of a Boiler Steel Frame
刘成清 1许弟兵 1张华鑫1
作者信息
- 1. 西南交通大学土木工程学院,成都 610031
- 折叠
摘要
对已使用十多年的铸铁厂锅炉钢框架进行结构安全性检测和抗震设防目标下的多遇地震和罕遇地震计算.选取 5 条天然地震波和 2 条人工地震波,以及远场类谐和地震波与近断层脉冲型地震波两类长周期地震波各 7 条;基于结构抗震性能量化指标——层间位移角,对结构的变形特点和抗震性能进行了分析,根据计算结果,对既有结构提出了加固设计方案并对加固后结构进行了分析.结果表明:远场类谐和地震波对结构的响应最大,天然地震波最小;多遇地震作用下的最大层间位移角均小于GB 50011-2010《建筑抗震设计规范》的限值 1/250;在罕遇地震作用下的层间位移角均小于GB 50011-2010 的限值 1/50;结构平均层间位移角最大值出现在底层,为1/88,较原结构的1/62,减小了29.5%,加固设计方案满足GB 50011-2010 的要求,实现了"小震不坏,大震不倒"的抗震设防目标.
Abstract
The structural safety of the boiler steel frame of a cast iron plant that has been used for more than ten years was tested,and the frequently and rarely occurred earthquakes under the seismic fortification target were calculated.Five common natural seismic waves were two artificial waves,as well as seven long-period seismic waves of far-field harmonic seismic waves and near-fault pulse seismic waves were selected.Based on the interlayer displacement angle,the deformation characteristics and seismic performance of the structure were analyzed.According to the calculation results,the reinforcement design scheme of the existing structure was proposed,and the seismic calculation of the structure after reinforcement was carried out again.The analysis results after reinforcement showed that the far-field harmonic-like seismic wave had the largest response to the structure,and the ordinary seismic wave had the smallest response.The maximum inter-story drift angles under frequently occurred earthquakes were all less than the limit value of 1/250 in Code for Seismic Design of Buildings(GB 50011-2010);the interlayer displacement angles under rarely occurred earthquakes were all less than 1/50;the maximum value of the average interlayer displacement angle of the structure appeared at the bottom,was 1/88,which was 29.5%lower than that of the original structure.The reinforcement design scheme could meet the requiremerts of GB 50011-2010,and realize the seismic fortification goal of'no damage under frequently occurred earthquakes and no collapse under rarely occurred earthquakes'.
关键词
钢框架/抗震加固/弹塑性/时程分析/层间位移角Key words
steel frame/seismic strengthening/elastic-plastic/time history analysis/interlayer displacement angle引用本文复制引用
基金项目
国家自然科学基金(51778538)
国家留学基金委项目(201707005100)
出版年
2024
NETL
NSTL
维普
万方数据