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斜拉桥主塔施工时,当塔肢处于悬臂施工状态时,在自重和施工荷载等作用下,塔柱横截面上会形成弯矩,可能会导致塔柱薄弱截面(例如塔座根部、中塔柱根部等)边缘混凝土出现较大的拉应力而开裂。为消除倾斜塔柱薄弱截面这种不良应力状态,在施工过程中,需要在下塔柱设置主动拉杆、中塔柱设置主动撑杆形成反弯矩,以抵消自重等产生的弯矩,避免塔柱产生较大拉应力及裂缝。本文以大门大桥主塔为例,详细介绍主动拉杆及主动撑杆设计思路及施工控制要点,希望能为今后类似桥梁结构设计提供参考。
During the construction of the main tower of cable-stayed bridge, when the tower limbs are in the cantilever construction state, the bending moment will be formed on the cross-section of the tower column due to the self-weight and construction load, which may lead to the weak section of the tower column (for example, Tower root, etc.) edge of the concrete appears larger tensile stress and cracking. In order to eliminate this bad stress state of the weak cross section of the inclined tower, during the construction process, an active tie rod needs to be arranged on the lower pylon and an active brace to form a counter bending moment in the mid pylon to counteract bending moment due to dead weight, Have a greater tensile stress and cracks. In this paper, taking the main pylon of Daomen Bridge as an example, this paper introduces in detail the design ideas and construction control points of active tie rods and active stays, and hopes to provide reference for the design of similar bridges in the future.