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以某主跨80m的变截面连续梁桥在悬臂浇筑施工过程中腹板沿着下弯钢束波纹管方向出现了裂缝为依托,对其成因进行理论分析,采用Ansys建立局部有限元计算模型,对其受力特性进行验证。结果表明:腹板下弯钢束的张拉是出现腹板裂缝的直接原因,尚未灌浆的预应力管道加速了裂缝的开展,调整预应力张拉次序并采取预防措施后,取得了明显效果。
Taking a 80m cross-section continuous girder bridge with cantilever pouring construction as an example, the web was fractured in the direction of the corrugated pipe of the bent down steel beam. The causes were analyzed theoretically. The local finite element model was established by Ansys. Its force characteristics to verify. The results show that the tension of the web under the bending of the web is the direct cause of the web crack. The un-grouted prestressed pipe accelerates the development of the crack, and the prestressing tension sequence is adjusted and preventive measures are taken, and the obvious effect has been achieved.