摘要
由于中小型拱式结构在不同的张拉阶段结构所处的力学状态不同,而吊杆张拉力的计算方法与结构的力学状态密切相关。系统地阐述了正装法、倒装法、影响矩阵法、无应力状态法的应用思路、计算步骤以及各类方法的优缺点,指出了各方法在不同张拉阶段的适用范围:脱架阶段可采用倒装法、正装法和无应力状态法,影响矩阵法应当慎重使用;脱架以后,影响矩阵法由于其与张拉顺序无关的特点而得到广泛应用,也可采用直接迭代法与无应力状态法,一般不采用倒装法。对于异型结构可将无应力状态法中的锚头拔出量转化为吊杆张拉力,利用无应力状态法的优点实现多根吊杆的同步张拉。
Because the mechanical behaviors of small and medium-size arched structures are different in different tension stages, the tension calculation of a hanger rod is related with its mechanical behavior. The applying methodology, calculation procedures, and the advantages and disadvantages of forward analysis method, backward analysis method, influence matrix method and unstressed state method were discussed. The applicability of those methods at different tension stage was proposed. Forward analysis method, backward analysis method, unstressed state method can be used before the arch template is taken off, while influence matrix method should be carefully used. When the arch framework is removed, influence matrix method can be widely used for its having nothing to do with tension sequences. The cable sliding increment of the anchor head in unstressed state method can be transformed to tension force of hanger rod to relize the synchronous tension of multiple hanger rods in complicated structures.
出处
《结构工程师》
2010年第4期154-159,共6页
Structural Engineers
关键词
吊杆
正装法
倒装法
影响矩阵法
无应力状态法
hanger rod, forward analysis, backward analysis, influence matrix, unstressed state method
