温度效应对CFRP索弦支穹顶结构的力学性能影响研究  

Research of temperature effect on mechanical properties of suspen-dome with CFRP cables

作　　者：杨燕 徐灿 许国文 吴杭姿 周华樟[3] 武岳[3] YANG Yan;XU Can;XU Guo-wen;WU Hang-zi;ZHOU Hua-zhang;WU Yue(China Construction Eighth Engineering Division Co.,Ltd.,Shanghai 200122.China;Research Center of Shanghai Carbon Fiber Composite Application Technology in Civil Engineering,Shanghai 200122,China;School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China)

机构地区：[1]中国建筑第八工程局有限公司,上海200122 [2]上海碳纤维复合材料土木工程应用工程技术研究中心,上海200122 [3]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090

出　　处：《空间结构》2024年第4期12-20,共9页Spatial Structures

基　　金：中建股份科技研发计划项目(CSCEC-2022-Z-8);上海市住房和城乡建设管理委员会科研项目(沪建科2021-002-024)。

摘　　要：CFRP索在大跨空间结构领域的应用是当前工程界关注的热点之一.由于CFRP材料与钢材的温度性能差异较大,由两种材料构件组成的空间结构的受力性能在温度作用下表现出显著的差别.针对此问题,以弦支穹顶结构为对象,提出五种CFRP索应用方案,研究了钢索弦支穹顶与CFRP索弦支穹顶在不同温差荷载下的力学性能差异.研究结果表明,采用等刚度、等面积和等强度三种代换原则将弦支穹顶中的钢索局部或全部替换为CFRP索后,结构静力性能仍满足规范要求.其中径向索应用CFRP索对结构的力学性能影响不大,而环向索应用CFRP索对结构的力学性能具有显著影响.如环向索采用等刚度原则代换后结构刚度不变,构件应力减小,结构性能提升;而采用等强度原则代换后结构刚度明显减弱,网壳应力增大,结构性能降低.CFRP索弦支穹顶和钢索弦支穹顶的温度变形机制不同,负温差作用可能是CFRP索弦支穹顶的最不利因素,会使其结构刚度减小,极限承载力降低,且极限承载力和温差荷载大小呈线性关系.The use of CFRP cables in large-span spatial structures is a prominent concern in current engineering.Due to significant differences in thermal properties between CFRP and steel materials,structures composed of both materials exhibit notable performance variations under temperature effects.In this study on suspen-dome structures,five CFRP cable applications are proposed to assess mechanical performance differences compared to steel cables under varying temperature differentials.Results indicate that substituting steel cables with CFRP cables based on stiffness,cross-sectional area,and strength requirements still meets code specifications.Radial CFRP cable application minimally affects mechanical performance,while circumferential application has a significant impact.The temperature deformation mechanisms differ between steel and CFRP suspen-domes,with negative temperature differentials being the most critical factor for CFRP cables.This results in cable force loss,reduced stiffness,and a linear reduction in ultimate load-carrying capacity.

关 键 词：CFRP索 弦支穹顶 温度效应 静力性能 极限承载力 

分 类 号：TU394[建筑科学—结构工程]