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为解决弦支穹顶结构施工控制技术中撑杆下节点处的预应力滑移摩擦损失问题,考虑到滚动摩擦力远小于滑移摩擦力,提出一种含滚轴的滚动式撑杆下节点,并将其应用于某体育馆弦支穹顶结构。为验证滚动式撑杆下节点在降低预应力滑移摩擦损失方面的工作性能以及张拉施工过程中结构的安全性,采用ANSYS中的APDL语言编制了预应力施工数值模拟程序,对预应力张拉施工过程中索力、杆件内力和结构变形进行了全过程分析,同时对体育馆弦支穹顶结构预应力张拉过程进行了施工监测。结果表明:滚动式撑杆下节点的预应力摩擦损失在5%左右,是传统撑杆下节点预应力摩擦损失的50%;预应力张拉过程中,杆件轴向应力低于50 MPa,施工方案安全可行;施工监测数据验证了施工摩擦滑移数值模拟程序的可行性。
In order to solve the problem of prestressing sliding friction loss at the node under the strut in construction control technology of strut dome structure, considering that the rolling friction force is far less than the sliding friction force, a roller strut lower node is proposed, And it is applied to a gymnasium branch structure. In order to verify the working performance of the lower node of rolling struts in reducing the friction loss of prestressed sliding and the structural safety in the process of tensioning construction, the numerical simulation program of prestressing was programmed by the APDL language in ANSYS, During the process of construction, the whole process of cable force, internal force of rod and structure deformation were analyzed, and the construction monitoring of the prestressed tension process of the superstructure was carried out. The results show that the prestress friction loss of the lower node of the rolling strut is about 5%, which is 50% of the prestress frictional loss of the node under the traditional strut. The axial stress of the strut during the prestressing is lower than 50 MPa, The construction scheme is safe and feasible. The construction monitoring data verify the feasibility of the numerical simulation program of construction friction slip.