车辐式索桁架拉索松弛敏感试验及可靠性评估
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摘要
大跨空间钢结在实际工程操作或环境影响下势必会造成一定程度的松弛,拉索出现松弛后力系必定重新调整达到新的平衡,会引起杆件内力的增加或减小,影响结构安全性,以设计的跨度为6 m的车辐式索桁架结构为对象,进行了车辐式索桁架结构拉索松弛敏感性试验,研究了不同种拉索发生松弛时对结构的影响,得出环索松弛对结构力学性能影响最大,定义环索为车辐式索桁架结构敏感性构件;全部下径向索发生松弛时对结构影响最为不利.基于可靠性理论,运用响应面法和蒙特卡洛法得到可靠度指标,得到不同拉索发生松弛下对车辐式索桁架结构可靠度的影响和结构不同参数的灵敏度,可为车辐式索桁架结构发生预应力损失进行安全评估提供依据.
Large-span steel structures will inevitably cause some relaxation under the influence of actual engineering operations or environmental influences. After the cables are loosened, the force system must be readjusted to a new equilibrium, which will cause the internal forces of the members increase or decrease, and affect the structural safety. The designed cable-truss structure with a span of 6 m as the object, the experiment on relaxation of cable was done. A study was made of the influence to spoke cable-truss structure when different cable was loosened. It is concluded that the effect of relaxation on the loop cable is most obvious, and the loop cable is defined as the relaxation sensitive component, the most unfavorable structure occurs when all the lower radial cables are relaxed. Based on the reliability theory, the influence of different cable tensions on the reliability of the spoke cable truss structure and the sensitivity of different parameters of the structure were obtained by the response surface method and Monte Carlo method, the safety assessment could be performed for the prestress loss of the spoke cable truss structure.
Large-span steel structures will inevitably cause some relaxation under the influence of actual engineering operations or environmental influences. After the cables are loosened, the force system must be readjusted to a new equilibrium, which will cause the internal forces of the members increase or decrease, and affect the structural safety. The designed cable-truss structure with a span of 6 m as the object, the experiment on relaxation of cable was done. A study was made of the influence to spoke cable-truss structure when different cable was loosened. It is concluded that the effect of relaxation on the loop cable is most obvious, and the loop cable is defined as the relaxation sensitive component, the most unfavorable structure occurs when all the lower radial cables are relaxed. Based on the reliability theory, the influence of different cable tensions on the reliability of the spoke cable truss structure and the sensitivity of different parameters of the structure were obtained by the response surface method and Monte Carlo method, the safety assessment could be performed for the prestress loss of the spoke cable truss structure.
引文
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[2] 刘红波.弦支穹顶结构施工控制理论与温度效应研究[D].天津:天津大学建筑工程学院,2011.LIU Hongbo.Study on the construction control theory and temperature effect of suspen-dome structure[D].Tianjin:School of Architectural Engineering of Tianjin University,2011.
[3] 刘占省,王欢欢,李斌等.考虑拉索锈蚀与松弛的弦支筒壳结构可靠性分析[J].天津大学学报(自然科学与工程技术版),2016,49(S1):48.LIU Zhansheng,WANG Huanhuan,LI Bin,et al.Reliability analysis of cable supported barrel vault considering lasso’s corrosion and relaxation[J].Journal of Tianjin University(Science and Technology),2016,49(S1):48.
[4] 王树,张国军,葛家琪,等.2008奥运会羽毛球馆预应力损失对结构体系影响分析[J].建筑结构学报,2007(6):45.WANG Shu,ZHANG Guojun,GE Jiaqi,et al.Influence of prestress loss on structural behavior of the badminton gymnasium for 2008 Olympic Games[J].Journal of Building Structures,2007(6):45.
[5] KRISTEK V,KADLEC L.Probabilistic analysis of prestress loss due to creep in concrete box girders[J].Journal of Bridge Engineering,2017,22(12):10.1061/(ASCE)BE.1943-5592.0001079.
[6] YAN R Z,CHEN Z H,WANG X D,et al.A new equivalent friction element for analysis of cable supported structures[J].Steel and Composite Structures,2015,18(4):947.
[7] 田广宇.车辐式张拉结构设计理论与施工控制关键技术研究[D].北京:清华大学,2012.TIAN Guangyu.Research on key technology of design theory and construction control in spoke tension structures[D].Beijing:Tsinghua University,2012.
[8] 俞福利,刘中华.月牙轮辐式索桁架结构的预张力偏差分析及调整技术[J].空间结构,2013,19(4):67.YU Fuli,LIU Zhonghua.Pretension deviation analysis and adjustment of crescent and spokes cable truss structure[J].Spatial Structures,2018,19(4):67.
[9] 张守峰,朱炳寅,何相宇,等.东营会展中心结构设计中的关键技术[J].建筑结构,2009,39(7):5.ZHANG Shoufeng,ZHU Bingyan,HE Xiangyu,et al.Key structural technology in design of Dongying Convention and Exhibition Center[J].Journal of Building Structures,2009,39(7):5.
[10] 于滨,梁存之,董越,等.深圳宝安体育场轮辐式索桁架屋盖成形关键技术[J].建筑结构学报,2011,41(11):74.YU Bin,LIANG Cunzhi,DONG Yue,et al.Key techniques of roof construction of spoke cable truss structure in Shenzhen Bao ’an Stadium[J].Journal of Building Structures,2011,41(11):74.