Abstract：During the construction of Xiluodu ±800kV ultra-high voltage direct current (UHVDC) transmission project, some heavy equipments need to be transported through highways. The weights of the equipments exceed the ultimate load-bearing capacity of the passing bridges, so it is necessary to reinforce these bridges temporarily. A cable-truss reinforced structure system composed of prestressed strands and truss is proposed. The dead-weight of bridge plates can be balanced by the lift forces the truss due to tensioning of strands. In order to verify the reasonability and reinforcement effect of the system, a full-scale test was conducted. The whole process of heavy vehicles passing the bridges was simulated, the responses before and after the reinforcement were analyzed, and the prestressing loss of strands after crossing pulleys were studied. The analysis results indicate that the cable-truss reinforced structure system can partly offset the dead-weight of bridge plates, optimize the internal force distribution and effectively increase the strength and stiffness. During the experiments, no cracks emerge in the top and bottom surfaces of the bridges after reinforcement and loading. As steering gears, the pulleys can effectively promote the internal force transmission of strands and reduce prestress loss of strands.
罗尧治 李洋 沈雁彬 陈勤 段元锋 黄达余 冯仁祥. 重载作用下索-桁架加固结构体系试验研究[J]. 土木工程学报, 2017, 50(4): 48-56.
Luo Yaozhi Li Yang Shen Yanbin Chen Qin Duan Yuanfeng Huang Dayu Feng Renxiang. Experimental study on cable-truss reinforced structure system under heavy load. 土木工程学报, 2017, 50(4): 48-56.
