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钢板剪力墙结构边框柱的稳定性研究

DOI: 10.13197/j.eeev.2015.03.100.yujg.013, PP. 100-110

Keywords: 钢板剪力墙,边框柱稳定性,柱惯性矩阈值,抗剪承载力,边框柱挠度限值

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Abstract:

钢板剪力墙结构是一种新型经济高效的抗侧力体系,由钢框架内嵌钢板组合形成。钢板剪力墙结构的边框柱在附加弯矩作用下常产生“沙漏”这种不良的破坏模式,为此加拿大CAN/CSA(S16-01)规范依据薄腹梁理论柔度系数ωt给出了钢板墙结构边框柱的最小惯性矩要求。薄腹梁理论适用于极薄板,而我国规范和实际应用中多选用厚板墙或加劲墙,板厚往往处于中厚板范畴,柔度系数ωt的适用性有待讨论。本文结合经典的边框柱柔度限值推导过程,利用承载力和应力均匀性两种评价方法,对CAN/CSAS16-01规范给出的柱柔度限值小于或等于2.5的适用性进行了验证。基于通用高厚比的概念给出了钢板剪力墙结构的弹性抗剪承载力,同时采用拉力场机制份额考虑了内嵌钢板厚度的影响,修正了柱柔度系数。研究结果表明钢板墙宽高比较大时,CAN/CSAS16-01规范限值不满足要求,柱柔度限值应缩小到2.1,对应边框柱的惯性矩要求应扩大为S16-01规范限值的2倍。

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