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采用多种有限元程序对桥墩结构线性模拟分析,在凹槽直角处出现了较大的主拉应力,极有可能产生裂缝;在考虑材料非线性的基础上,通过大型有限元程序Midas/FEA对凹槽附近区域的裂缝情况进行了施工荷载与极限荷载作用分析,单个支座压力4 427kN时凹槽直角处首次出现裂纹,单个支座压力15 131kN时为极限状态。通过消除支座横桥向偏心荷载绕墩底外轮廓边线形成的强大弯矩,桥墩加固为上、下等截面形状,控制了裂缝的发展。
The finite element program is used to simulate the pier structure linearly. A large principal tensile stress appears at the right angle of the groove, which is very likely to cause cracks. Based on the material nonlinearity, the finite element program Midas / FEA Cracks in the area near the groove were analyzed for construction load and ultimate load. Cracks occurred for the first time at a single bearing pressure of 4 427 kN and at a single bearing pressure of 15 131 kN. By eliminating the strong moment formed by the lateral eccentric load of the abutment around the outer edge of the pier bottom, the piers are reinforced into upper and lower cross-sectional shapes to control the development of cracks.