高大施工支架是大跨度复杂桥梁工程中常用的钢结构支撑系统。实际工程中由于受到高大施工支架加工安装误差、超限受力或不均匀受力等因素影响,因此钢结构施工支架存在节点连接不牢固、杆件弯曲变形等初始缺陷。为明确初始缺陷对桥梁高大施工支架整体稳定性能的影响规律,首先开展了桥梁高大施工支架的线性屈曲分析,进而探讨了节点半刚性、杆件初弯曲等初始缺陷对桥梁高大施工支架极限承载力的影响规律。为提高桥梁高大施工支架极限承载力的求解精度,引入刚度系数来衡量节点半刚性,综合考虑节点体对杆件计算长度的影响 ...
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