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以中承式系杆拱桥——增城大桥为工程背景,建立了空间有限元模型,其中拱肋和主纵梁采用梁单元,吊杆采用桁架单元。研究吊杆不主动张拉工序时拆除主纵梁前后结构的受力状态,在保证与原设计成桥状态一致的情况下通过试算的方法得出了吊杆张拉完成后主纵梁脱架时吊杆主动张拉的张拉力。研究成果表明:中承式系杆拱桥采用吊杆主动张拉方法可以减少大桥在施工过程中受力和变形的不确定性,确保了大桥成桥状态与设计状态吻合较好。由于大桥吊杆较短,采用频率法测试其索力,精度受到限制,对此该文采用锚索计精确测量吊杆张拉力并以此来修正其有效长度的方法,结果表明该方法测试短吊杆的索力具有较高的精度,为大桥的后期施工控制奠定了基础。
Taking Zhongzheng tied arch bridge - Zengcheng Bridge as engineering background, a finite element model of space was established, in which the arch rib and the main longitudinal beam were made of beam elements and the boom was truss elements. Studying the stress state before and after the main longitudinal beam is dismantled when the boom is not actively tensioned, the main longitudinal beam is obtained after the tensioning of the boom by trial calculation under the condition of ensuring the same state of the original design bridge. Tension rod when the boom is automatically tensioned. The research results show that the method of active tensioning of the suspension rod in the Sino-style tied arch bridge can reduce the uncertainty of the force and deformation of the bridge during the construction, and ensure that the bridge completion state and the design state are in good agreement. Due to the short boom of the bridge, the cable method is used to test the cable force and the accuracy is limited. In this paper, the method of accurately measuring the tension of the boom with the cable anchor is used to correct the effective length of the boom. Suspension cable with high precision cable for the post-construction control of the bridge laid the foundation.