%0 Journal Article
%T 钢筋混凝土梁-柱-板边节点现浇板主裂缝倾角分析<br>Analysis of main crack inclination angle of cast-in-situ slab in reinforced concrete beam-column-slab exterior joints
%A 邢国华
%A 李卫卫
%A 谢鹏宇
%A 刘伯权
%J 长安大学学报(自然科学版)
%D 2017
%X 针对现浇板显著影响钢筋混凝土梁柱节点的受力性能，但其抗震机理尚未明确，以及低周反复荷载作用下现浇板形成主裂缝后的失效是不含直交梁的钢筋混凝土梁-柱-板边节点破坏模式之一的问题，研究钢筋混凝土梁-柱-板边节点在地震荷载作用下的受力性能，分析现浇板与框架柱相交处的应力，通过假定现浇板不承受来自框架梁的作用力，将其框架边节点中现浇板主裂缝倾角分析简化为平面问题。基于弹性力学位移变分法中的里茨法，忽略现浇板沿厚度方向的应力和应变，将梁-柱-板边节点受力性能分析视为平面应力问题，提出边节点中现浇板的主裂缝倾角的简化力学模型。通过计算现浇板开裂时破坏点的应力状态，并通过该破坏点单元体分析，计算主平面角度，即现浇板与框架柱相交处形成的主裂缝破坏角度。研究结果表明：低周反复荷载下钢筋混凝土梁-柱-板边节点现浇板的主裂缝倾角理论值分别为34.05°和34.19°，与试验结果吻合较好，提出的简化力学模型可用于强震下钢筋混凝土框架节点的受力分析。<br>Cast-in-situ concrete slab greatly influences the mechanical behavior of reinforced concrete beam-column joint. But its seismic mechanism is not yet clear. And under low-cyclic revised loading, failure of cast-in-situ slab after forming main cracks is one of the failure modes of reinforced concrete beam-column-slab exterior joints without containing lateral beam. Aiming at solving these problems, mechanical behavior of reinforced concrete beam-column-slab exterior joints was studied under earthquake loading, junction stress between cast-in-situ slab and frame column was analyzed, and analysis of inclination angle of the main crack of cast-in-situ concrete slab of frame exterior joints could be simplified as a plane problem by assuming the slab would not bear the force generating from frame beam. Based on Ritz method of displacement variational method in elastic mechanics, a simplified mechanical model of main crack inclination angle of cast-in-situ slab in exterior joints was put forward by considering mechanical behavior of beam-column-slab exterior joints as a plane stress problem and ignoring stress and strain along the thickness direction of cast-in-situ slab. By calculating the stress state of failure point when cast-in-situ slab cracked and analyzing the unit of failure point, the angle of principal plane was calculated, that is, the failure angle of main crack formed at the intersection of cast-in-situ slab and frame column. The results show that theoretical values of inclination angles of the main cracks of cast-in-situ concrete slab in reinforced concrete beam-column-slab exterior joints under low-cycle revised loading are 34.05°and 34.19°respectively, which agree well with the experimental results. The suggested simplified mechanical model can be utilized to analyze the stress of reinforced concrete frame joints under strong earthquake attack
%K 结构工程
%K 框架节点
%K 平面应力
%K 里茨法
%K 开裂
%K 角度&lt
%K br&gt
%K structural engineering
%K frame joint
%K plane stress
%K Ritz method
%K crack
%K angle
%U http://zzszrb.chd.edu.cn/oa/DArticle.aspx?type=view&id=201509061