【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.更多还原

【Abstract】 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.更多还原