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在索塔施工阶段,施工控制的主要计算参数包括索塔预抬高和主塔允许偏位。以清水河桥开阳侧索塔为例,利用MIDAS/Civil建立了桥塔的有限元空间模型,计算分析贵州清水河大桥的索塔预抬高量和猫道架设过程中的允许偏位,其中主塔允许偏位是依据最不利工况下的索塔混凝土拉应力不超过其抗拉强度设计值的计算标准来确定。经过计算分析得到:不考虑温度修正开阳侧索塔左右塔柱的预抬高量均取70mm;猫道架设过程中,开阳侧索塔允许水平偏位为±15cm,允许扭转位移为1.2cm;猫道架设完成后,开阳侧索塔桥塔允许水平偏位为±20cm,允许扭转位移为1cm。
In the pylon construction phase, the main calculation parameters of construction control include the pylon pre-elevation and the main tower allowable deviation. Taking the Qingyang River Bridge Kaiyang lateral pylon as an example, the finite element space model of the bridge tower was established by using MIDAS / Civil. The pre-uplift of the tower of Guizhou Qingshuihe Bridge and the permissible deviation of erection of the catwalk were calculated. The allowable deviation of the main tower is determined according to the calculation standard of the tensile stress of the pylon concrete under the most unfavorable conditions not exceeding the designed value of the tensile strength. After calculation and analysis, it is obtained that, regardless of the temperature correction, the pre-elevation amounts of the tower pillars around the Kaiyang lateral pylon are both 70mm; during the erection of the catwalk, the lateral pylon is allowed to have a horizontal deviation of ± 15cm and the torsional displacement of 1.2 cm; cat road erection is completed, the open side of the tower tower bridge allows the horizontal deviation of ± 20cm, allowing the torsion displacement of 1cm.