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对斜拉桥箱形截面索塔塔壁预应力锚固体系,采用拉-压杆模型方法对拉索直接锚固的塔柱前壁进行研究。以力法为手段,依据拉-压杆模型的优化原理,确立了体内单锚的拉-压杆模型。以单锚拉-压杆模型为基础,初步构建前壁的拉-压杆模型。取z为拉杆(T3)与结点(1)间的竖向距离,采用力法建立以z为函数的拉杆内力的表达式,利用拓扑优化成果(T2=0)和卡尔丹公式,确定z的数值,自下而上全面解答了前壁的拉-压杆模型,从而准确反映在拉索竖向分力作用下前壁拉、压应力的分布状况。最后,通过对宜宾长江大桥索塔的实例研究,提出α3=23.3°,简化了前壁拉-压杆模型,且具有较好的工程精度,可用于确定索塔锚固区的预应力筋的规格。
For the prestressed anchorage system of cable box girder with box section of cable-stayed bridge, the front wall of the pylon directly anchored by cable was studied by the pull-bar model. According to the optimization principle of the pull-strut model, the pull-strut model of the single-body in-body is established by using the force method. Based on the single-anchor pull-strut model, the pull-strut model of the front wall is constructed. Taking z as the vertical distance between tie rod (T3) and node (1), the expression of tie rod internal force as a function of z is established by force method. By using the topology optimization result (T2 = 0) and the Cartan formula, z , The pull-bar model of the front wall is fully solved from the bottom up so as to accurately reflect the distribution of the tensile and compressive stress of the front wall under the vertical component of the cable. Finally, based on the case study of the tower of Yibin Yangtze River Bridge, it is proposed that α3 = 23.3 °, which simplifies the model of the front-wall pull-strut and has good engineering accuracy and can be used to determine the prestressing tendon of the pylon anchorage zone .