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为研究三塔斜拉-自锚式悬索组合体系桥在成桥阶段活荷载作用下的结构受力性能,依据相似理论,制作了1∶20的全桥缩尺模型。利用模型试验研究了该体系桥在对称与非对称荷载作用下的结构力学特性,对加劲梁、吊杆、拉索、主塔与副塔的力学行为进行了分析。结果表明:在成桥阶段活载作用下,模型桥对称性较好、刚度较大、抗弯扭性能较好;模型桥能较准确地反映实桥的受力特性,所测得的试验数据,已成功用于指导实桥设计;理论计算值和实桥换算值与试验实测值吻合较好;模型桥及实桥均满足规范要求,该体系桥梁在使用阶段安全可靠。
In order to study the mechanical behavior of the three-tower cable-stayed-self-anchored suspension cable system under live load in the bridge-forming stage, a 1: 20 full-scale model was developed based on the similarity theory. The structural mechanics characteristics of the system bridge under symmetrical and asymmetrical loads are studied by means of model tests. The mechanical behaviors of the stiffening girder, boom, cable, main tower and auxiliary tower are analyzed. The results show that the model bridge has good symmetry, high stiffness and good flexural and torsional performance under live load in the bridging stage. The model bridge can more accurately reflect the mechanical properties of the real bridge. The measured data , Has been successfully used to guide the design of real bridge; the theoretical calculation value and real bridge conversion value is in good agreement with the experimental observation value; both the model bridge and the real bridge meet the requirements of the specification, and the bridge of the system is safe and reliable during the use phase.