山区大跨度钢桁梁斜拉桥极限承载力分析  

Ultimate load carrying capacity analysis of long-span steel truss girdercabled-stayed bridge in mountainous area

作　　者：王泳金 任伟新 秦李冯 WANG Yongjin;REN Weixin;QIN Lifeng(College of Civil and Traffic Engineering,Shenzhen University,Shenzhen 518061,Guangdong,China)

机构地区：[1]深圳大学土木与交通工程学院,广东深圳518061

出　　处：《哈尔滨工业大学学报》2023年第11期1-6,共6页Journal of Harbin Institute of Technology

基　　金：深圳市科技创新委员会项目(JSGG20210802093207022,GJHZ20200731095802007,KQTD20180412181337494)。

摘　　要：在介绍某电厂氧化风管固定式空气喷雾器布置情况的基础上,结合其脱硫设计和运行情况存在的不足,分析了氧化风管堵塞的原因,提出了切除伸入氧化风母管的多余分支管、调整吸收塔内部分支管水平度、增加冲洗水系统以及检修孔等有效措施,有效遏制了氧化风管堵塞现象,确保了脱硫系统安全稳定及经济运行。The structural composition of long-span cable-stayed bridges in mountainous area is complex.As the static behavior of the whole structure under live loads presents obvious nonlinearities,the structural stability problem is prominent.Therefore,based on a steel truss girder cable-stayed bridge with a main span of 930 m under construction in the south mountainous area of Yunnan Province,China,the ultimate load carrying capacity analysis is carried out by using limit point instability theory where both structural geometric and material nonlinearities are considered.It is aimed at investigating the nonlinear behavior and failure mechanism of such a long-span bridge under live loading.Because of the existence of“canyon effect”for the wind in the mountainous area,the bridge is easy to be affected by wind loads during construction.Subsequently,the ultimate load carrying capacity analysis of the bridge at the maximum cantilever construction state is performed under static wind loading.The results have shown that the geometric nonlinearity has less influence on the structural performance than the material nonlinearity does.The ultimate load carrying capacity of the long-span cable-stayed bridge is controlled by the material failure of the cable.With the increase in live load,the elastic-plastic zones develop gradually.The tensile and compressive plastic zones appear successively on the steel truss girder,forming four yield paths.At the maximum cantilever construction stage,the calculated ultimate load capacity is greater than static wind load of Grade 12 wind speed.

关 键 词：燃煤电厂 烟气脱硫 强制氧化 氧化风管 堵塞 

分 类 号：U448.14[建筑科学—桥梁与隧道工程]