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为研究三塔斜拉桥索塔锚固区的局部受力特性,以2×616 m的三塔组合梁斜拉桥为研究对象,运用ANSYS的APDL语言建立了索塔锚固区的梁-实-接触参数化有限元模型。对不同高度模型的数值结果进行了对比分析,确定出合理的试验模型高度。在此基础上,选取索塔锚固区有代表性的节段进行了足尺模型试验,并对试验的测试内容、测试步骤和试验方法进行了详细阐述。研究结果表明:短边、长边预应力钢筋的预应力损失分别占张拉力的15.3%、10.4%;实测值与计算值基本吻合,锚固区有足够的压应力储备;在正常使用状态下,与现有双塔斜拉桥索塔锚固区模型相比,试验模型其顺桥向测点变形最小少1.6倍、最大少4.03倍。
In order to study the local stress characteristics of the pylon anchorage zone of a three-tower cable-stayed bridge, taking the 2 × 616 m three-tower composite girder cable-stayed bridge as the research object, the APDL language of ANSYS was used to establish the beam- Contact parametric finite element model. The numerical results of different height models are compared and analyzed to determine the reasonable height of the experimental model. On this basis, a full-scale model test was carried out by selecting representative segments of the anchorage zone of pylon. The test contents, test procedures and test methods were described in detail. The results show that the prestressing loss of short-side and long-side prestressing steel accounts for 15.3% and 10.4% of the tensile force, respectively. The measured values are in good agreement with the calculated values, and the compressive stress reserves in the anchorage zone are sufficient. Under normal conditions, Compared with the existing anchorage zone model of twin tower cable-stayed bridge, the test model has the least deformation 1.6 times less and the maximum less 4.03 times.