三塔斜拉-自锚式悬索组合体系桥成桥阶段活载模型试验研究

Model Test on Cable-stayed and Self-anchored Suspension Combination Bridge with Three Towers Under Live Loading in Finished Stage

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 research mechanical behavior of cable-stayed and self-anchored suspension combination bridge with three towers under live loading in finished stage,an 1∶20 scale model of the entire bridge was produced based on the similarity theory.The structural mechanical properties under the symmetric and asymmetric live loading was studied using model test and mechanical behavior of stiffening girder,suspender,cable,main tower and auxiliary tower were analyzed.The results of model test indicate that the symmetry of the model bridge is good,the rigidity is large,and it has good bending and tensional properties under live loading in finished stage;Mechanical characteristics of real bridge is reflected by the model bridge,and the test data obtained by model bridge has been successfully used to guide the real bridge design;Calculated value of model bridge and conversion values of real bridge are agreed with test data very well;The model and real bridge meet the requirements of Design Code of China,and this kind of bridge is safe and reliable in using stage.