现浇楼板对框架结构柱梁强度比的影响研究

马千里，叶列平，陆新征，马玉虎

（清华大学土木工程系，北京，100084）

汶川地震建筑震害分析与重建研讨会论文集, 2008.6, 北京

摘要：“强柱弱梁”屈服机制是框架结构的抗震设计原则，但由于现浇楼板等因素的影响，实际框架结构并不能实现梁铰屈服机制。本文总结了大量研究者的试验和分析结果，并通过算例证明楼板对框架梁的负弯矩承载力有较大提高，因此建议将框架梁等效为Ｔ形或者G型梁进行设计计算，在此基础上按规范要求考虑柱端弯矩放大系数；或将楼板钢筋考虑为超配钢筋，进一步提高柱端弯矩放大系数，使实际结构真正实现“强柱弱梁”的屈服机制。

关键词：框架结构，强柱弱梁，柱梁强度比，楼板，有效翼缘宽度

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