弦支穹顶结构索撑节点预应力损失计算方法

alculating the pre-stress loss of cables in cable-strut joints accurately is the crucial step for construction control of suspend-domes. The pre-stress loss caused by friction of cable-strut joints is the critical factor. The characteristics of cable-strut joints are explored in this paper. The pre-stress losing mechanism during pre-tension is investigated. On the basis of the porthole friction theory using in pre-stressed concrete members, the method for evaluating the pre-stress loss in cable-strut joints of the suspend-domes are developed. A corresponding simplified formula is proposed. The calculation method is adopted for evaluating the pre-stress loss of an actual suspend-dome. The results show that the method is simple and effective.