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大榭第二大桥为单索面斜拉桥,为了验证其钢—混组合索塔在施工过程中的抗风安全性,采用有限元数值分析方法,对索塔在下横梁浇筑前、上横梁浇筑前、裸塔阶段等3种施工控制状态,在20年一遇台风作用下的静阵风荷载响应进行了分析,并进一步分析了裸塔状态下施加临时风缆后对抗风性能的改善情况。研究结果表明:索塔施工过程中风荷载作用下产生的最大拉应力出现在裸塔阶段,位于横桥向迎风侧中塔柱根部,与恒载效应组合后,最大拉应力值为5.04MPa,;最大拉应力产生的裂缝宽度为0.067mm,小于规范规定的限值(0.15mm);裸塔状态下施加临时风缆可以显著减小混凝土塔柱的最大拉应力。
Daxie Second Bridge is a single cable plane cable-stayed bridge. In order to verify the wind-resistant safety of the steel-concrete composite pylon during construction, the finite element method is used to analyze the pylon before pouring the upper beam and the upper beam Before and during the naked tower stage, the static gusty wind load response under typhoon in 20 years was analyzed, and the improvement of the wind resistance after applying the temporary wind cable in the bare tower state was further analyzed. The results show that the maximum tensile stress produced by the wind load during the construction of the cable pylon appears at the naked tower stage and at the root of the mid-tower in the windward side of the transverse bridge. After combined with the constant load effect, the maximum tensile stress is 5.04 MPa. The maximum tensile stress produces a crack width of 0.067 mm, less than the limit specified in the code (0.15 mm). Applying a temporary air cable in a bare tower condition can significantly reduce the maximum tensile stress of a concrete tower.