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钢筋混凝土夹芯节点抗剪承载力可靠度分析

, PP. 63-70

Keywords: 钢筋混凝土,夹芯节点,抗剪承载力,可靠度,Monte-Carlo法

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Abstract:

高层建筑结构中,中底部几层柱混凝土强度往往高于梁板混凝土的强度等级,为施工方便或施工技术不当,形成夹芯节点。当梁柱混凝土级差过大时,节点承载力不能满足要求。结合某一实际工程项目用Monte-Carlo法对钢筋混凝土夹芯节点抗剪承载力的可靠指标β进行计算,并对钢筋混凝土夹芯节点定量分析了荷载效应比、轴压比、结构重要性、节点混凝土强度、节点核心区箍筋间距和强度等因素对节点抗剪承载力的可靠指标β的影响。研究结果表明在柱混凝土强度等级为C60情况下,强度差大于20MPa的夹芯节点,可靠度指标均小于3.7,节点核芯区的抗剪能力要求不能满足,应采取相应的措施予以加强。

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