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以弦支筒壳预应力空间结构为研究对象,基于静力平衡法,提出一种以控制结构水平侧移来确定其初始预张力的设计方法,通过迭代计算,使其支座处水平侧移趋于零时,索中所对应的内力值为其理想初始预张力设计值。试验中研究了1∶15的缩尺模型,验证了静力平衡法求解弦支筒壳结构初始预张力的合理性。将此原理引入到索力测量中,依据索杆节点汇交力系的平衡关系,推导出各段索力的计算式,仅需测出撑杆内力、端部索段内力及索杆间夹角,即可测算出其他各段索的内力值。试验结果表明,该方法测量索力是可行的。
Based on the static balance method, a design method is proposed to determine the initial pretension by horizontal displacement of the control structure. By iterative calculation, the position of the support is horizontally shifted As it approaches zero, the internal force value corresponding to the cable is its ideal initial pre-tension design value. The 1:15 scale model was studied in the experiment, which verified the rationality of the static balance method to solve the initial pretension of the chord support shell structure. Based on the equilibrium relationship between the rod forces of the cable ties, this principle is introduced into the cable force measurement. The formula for calculating the cable force is deduced. Only the internal force of the brace, the internal force of the cable and the cable clamp Angle, you can calculate the value of the other sections of the cable force. The test results show that this method is feasible to measure the cable force.