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连续索在接触点处滑移时会受接触点摩擦的影响,导致连续索在接触点两侧索力不相等。张拉连续索施加预应力时,接触点处的摩擦力使远离张拉端的索段预应力存在一定程度的损失。针对索在接触点处滑移时的摩擦问题,该文采用有限质点法,将连续索离散成相互联系的质点集合,质点间通过索单元连接,滑移索单元内力根据接触点力传递系数和索单元原长不变原则求解。该文推导了考虑接触点摩擦的滑移索单元内力求解公式,提出了索滑移判定准则,并给出了接触点力传递系数计算方法,通过自编程序对算例进行计算分析,验证了考虑接触点摩擦的滑移索单元的正确性和合理性。
When the continuous cable slides at the contact point, it will be affected by the friction of the contact point, resulting in that the cable forces on both sides of the contact point are not equal. When the prestressed cable is tensioned, the friction force at the contact point causes a certain loss of cable prestress away from the tensioned end. Aiming at the problem of the friction of the cable when it slides at the contact point, finite element method is used to discretize the continuous cable into a set of interconnected particles. The mass points are connected by cable elements. Cable unit unchanged principle of the original solution. This paper derives the solving formula of the internal force of the slip cable unit considering the contact point friction, puts forward the criterion of cable slip determination, and gives the calculation method of the force transfer coefficient of the contact point. The example is calculated and analyzed by self programming, Correctness and rationality of sliding cable unit considering contact point friction.