现浇楼板对RC框架梁抗弯承载力的增强作用  

Study on the Effect of Over-strength Caused by Casting Slab on the Moment Bearing Capability of Beam for Reinforced Concrete Frame Structures

作　　者：李永梅[1] 郭磊[2] 周锡元[1] 

机构地区：[1]北京工业大学工程抗震与结构诊治北京市重点实验室,北京100124 [2]北京工业大学城市与工程安全减灾省部共建教育部重点实验室,北京100124

出　　处：《土木工程与管理学报》2012年第4期20-24,共5页Journal of Civil Engineering and Management

摘　　要：震害分析表明,大量的现浇钢筋混凝土框架结构并未实现设计规范所要求的"强柱弱梁"梁铰破坏机制。总结国内外研究现状,研究楼板作用(楼板内钢筋)对支座节点处的实际负弯矩增强作用机理;并基于设计规范中的规定,通过实例计算分析,表明尽管GB 50011-2010规范、GB 50010-2010规范和JGJ 3-2010规程进一步提高了柱端弯矩增大系数,但在板具有较高配筋率时,仍不能完全保证"强柱弱梁"的实现。最后给出了增强柱端弯矩、以及梁端实际负弯矩计算和配置等方面的设计建议。By analyzing the failure model of various reinforced concrete frame structures in earthquake,it shows that the failure mechanism of strong column and weak beam expected could not achieve for a lot of casting reinforced concrete frame structures.Based on the effect of casting slab on the moment bearing capability of beam in reinforced concrete frame structures,the mechanism on the effect of the over-strength caused by casting slab on the negative moment bearing capability of beam end is studied.By analyzing an actual example according to design codes,it shows that although the increasing coefficients of moment of column end are enhanced in GB 50011-2010 code for seismic design of buildings,GB 50010-2010 code for design of concrete structures,and JG J3-2010 technical specification for concrete structures of tall building and higher ratios of reinforcement were used,the mechanism of strong column and weak beam cannot be surely achieved.In conclusion,some suggestions for structural design are given for reinforced concrete frame structures,such as how to strengthen bending moments at the ends of column,to calculate real negative bending moments at the ends of beam and so on.

关 键 词：钢筋混凝土框架结构 现浇楼板 强柱弱梁 破坏机制 

分 类 号：TU375[建筑科学—结构工程]