斜向索力下钢-混凝土组合索塔锚固区荷载传递与分配关系分析

为了研究斜拉桥钢混凝土组合索塔锚固区在斜向索力作用下的特殊传力形式,利用变形协调原理分别讨论了水平分项索力和竖向分项索力在索塔锚固区的传力过程和分配关系.在此基础上推导了水平分项索力在钢锚箱和混凝土塔壁之间的分配计算公式.并通过算例比较荷载分配计算公式和有限元模拟分析的结果,验证公式的准确性和适用性.研究结果表明,水平分项索力通过钢锚箱侧板和混凝土侧壁的拉伸以及混凝土端壁的弯曲三者变形协调进行索力传递和分配,钢锚箱侧板承担大部分的水平索力,而混凝土塔壁只分担其余少部分.另一方面竖向分项索力的传递需考虑钢锚箱端板,剪力钉和混凝土端壁的变形协调.可见通过变形协调原理可以有效地分析斜向索力在组合索塔中的传力机理和传递过程,并且根据有限元结果的对比证明荷载分配计算公式能够满足较高的精度.

Analysis of load transferring and distribution in anchorage zone of steel-concrete composite pylon under inclined cable forces

To study the special behaviour of load transferring mechanism of steel-concrete composite pylon under the inclined cable forces,deformation compatibility principle was adopted to analyze the transferring process and distribution of horizontal and vertical component cable force respectively.The distribution formula of horizontal component force between steel anchor cell and concrete tower wall was deduced then.In order to testify the veracity and application of distribution formula,computing results were contrasted to those from finite element method.Analysis results show that horizontal component force can be transferred and distributed by deformation compatibility of tension in steel and concrete side wall and bending in concrete end wall.As a result the majority of horizontal component force is borne by steel side wall while the rest by concrete end wall.On the other hand vertical component force is transferred through the compatibility of steel end wall,concrete end wall and shear studs.Therefore it is an effective way to analyze the load transferring mechanism and process by deformation compatibility principle. And it is shown that the distribution formula of horizontal component force provides more accurate results than finite element method.