框架柱双 向压弯承载力不 足是 导致 地震 发生时结构 严重 破坏甚 至倒塌 的原 因之一 。文 章基 于截 面等效 的方法 ,在不改变截面面积、混凝土受压区面积以及截面等效前后对中和轴面积矩相等的条件下,得到框架柱 双向压弯承载力计算用等效截面,同时基于平衡原理建立了双向压弯承载力简化计算方法,利用简化计算方法 和等效梭形法对空间节点试验中框架柱的双向压弯承载力进行了计算,在保持配筋数量和截面几何参数不变 的条 件下 考虑了纵筋分别 向角筋偏移 2倍钢筋直径 、4倍钢 筋植 筋和与角筋紧密接触三种情况来探索提高截面 双向压弯承载力的方法 。结果表 明:两种方法所得结果 与试验 实测值 均符合 较好 ,且简化 方法计算 精度 较高 , 与试验实测值仅相差 3%;随着纵筋向角筋的偏移 ,框架柱截面双向压弯承载力明显提高,提高幅度在 14% ~ 42% 。 关键词:钢筋混凝土柱;双向压弯;承载力 ;简化计算 ;截面等效 中图分类号 :TU375 文献标 识码 :A Simplified calculation ofbendingstrength ofbiaxial compression-bending reinforced concretecolum n Liu Chunyang,W ang Meng (SchoolofCivilEngineering,ShandongJianzhuUniversity,Jinan250101,China) Abstract: Poor load carrying capacity of the reinforced concrete column under the biaxial compression—bendingaction is one ofthe reasonswhy the frame columns had been found damaged evencollapsed duringthe earthquake.W ithoutchangingthe section area,concretecompression zone area andtheareamomenttotheneutralaxisbeforeandafterthesection equivalentconvemion,based onthecrosssectionequivalentmethodtheequivalentsectionusedforcalculatingthebearingcapacity ofthe frame column under methodon biaxialbending biaxialbending effectisfound. capacity ofthe fame column is Furthermore, the simplified calculation established on the basis ofequilibrium principle.ThebiaxialbendingbearingcapacityoftheLamecolumnofspatialjointiscalculatedby usingthesimplified methodand theequivalentspindlesection method.Thecalculationresultsand the experimentresult show good agreement and the calculation accuracy of the simplified method is higher.thedifferencebetween them isonly3% . Toimprove thebearing capacity ofbiaxialbending section,the longitudinalsteelbarsare moved to theanglesteelby 2,4timessteelbardiameterand closely contacted with the angle steelbar, respectively. The reinforcementquantity and the CROSS section geometricparametersare unchanged. The calculation resultsshow thatthetwo—way bending bearingcapacityisenhanced obviously bydegreeof14% ~42% ,with themovingofthe steelbarsto
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