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弦支穹顶由单层网壳和下部索杆组成。在零状态时给结构中索杆单元施加一组既定的初始应变,计算后结构便会得到一组确定的单元内力值,依据这一对应关系,提出了一种求解零状态时,索杆单元所需施加初始应变值的迭代计算法,并给出了相应的计算公式与计算流程。为了准确、可靠地指导弦支穹顶的实际施工,确保施工的顺利进行,该文结合具体的张拉方案,利用迭代计算法,将零状态下索杆单元所需的初始应变确定后,依据各单元在初始态与零状态下无应力长度之差确定的原则,提出了基于初始应变不变的施工模拟计算法,并对一跨度为122m的弦支穹顶,在已定施工张拉工序的基础上进行了施工张拉模拟计算。计算结果表明:迭代计算公式高效准确,施工模拟计算法的计算假定与计算流程更加符合实际施工过程。这一施工模拟计算法可在实际结构施工张拉模拟计算过程中采用。
The chord dome consists of a single-layer reticulated shell and a lower cable rod. At zero state, a set of initial strain is applied to the cable rod in the structure. After calculation, the structure will get a set of determined internal force of the unit. Based on this correspondence, The required initial strain value iterative calculation method, and gives the corresponding calculation formula and calculation flow. In order to accurately and reliably guide the actual construction of the chordal dome to ensure the smooth construction, this paper combined with the concrete tensioning scheme, using the iterative method to determine the initial strain required for the rod unit in zero state, Based on the principle of determining the difference between the initial stress and the stress-free length of the element, the construction simulation method based on the initial strain is proposed. For a chordal dome with a span of 122m, On the construction of the tensile simulation. The calculation results show that the formula of iterative calculation is efficient and accurate, and the calculation assumptions of construction simulation method and calculation flow are more in line with the actual construction process. This construction simulation calculation method can be used in actual structural construction simulation of tension calculation.