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采用定尺定长设计与张拉技术进行施工时,确定拉索以及其他刚性构件的施工误差限值对工程建设和验收非常重要,但目前缺乏相应的统一标准。为此进行了宝安体育场屋盖结构施工误差敏感性试验,模拟了车辐式结构径向索、环索、飞柱的长度以及环梁位形的施工误差。研究结果表明:径向索、飞柱长度以及环梁径向位形误差对本榀索桁架预应力的影响约为相邻索桁架的2～3倍,对距离3榀以上的索桁架影响较小,将这3类构件定义为局部敏感性构件;环索误差对各处径向索预应力的影响较接近,定义环索为全局敏感性构件。在此基础上结合一次二阶矩可靠度指标,提出车辐式结构施工误差限值的控制方法。该方法首先将预应力变化量表达为施工误差值随机变量的线性函数,依据构件的敏感性分类确定线性函数的项数;然后由预应力变化量得到临界状态方程和一次二阶矩可靠度指标;最后由可靠度指标需要满足的范围得出每个施工误差值应满足的统计学限值。该方法得到的施工误差限值可以用于指导宝安体育场车辐式屋盖结构的施工和验收。
It is very important to determine the construction error limits of cables and other rigid components when construction is carried out by using the fixed-length design and the tensioning technique. However, there is a lack of corresponding uniform standards at present. To this end, Baoan stadium roof structure construction error sensitivity test was carried out to simulate the radial structure of the radial spoke cable, ring cable, flying column length and the ring beam shape of the construction error. The results show that the influence of the radial cable length, the length of the flying column and the radial position error of the ring beam on the prestress of the cable truss is about 2 ~ 3 times that of the adjacent cable truss and less significant to the cable truss above 3 榀The three types of components are defined as local sensitive components. The influence of the cable errors on the radial prestress of radial cables is similar, and the definition of the ring cable is the global sensitive component. Based on this, combined with the first-order moment reliability index, the paper puts forward the control method for the construction error limit of vehicle spoke structure. Firstly, the change of prestress is expressed as a linear function of the random variable of construction error, and the number of linear functions is determined according to the sensitivity classification of components. Then, the critical state equation and the second-order moment reliability index Finally, the statistical limits that each construction error value should meet are obtained from the range that the reliability index needs to satisfy. The construction error limit obtained by this method can be used to guide the construction and acceptance of the carport roof structure of Baoan Stadium.