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作 者:陶德怀 谢鲁齐[2] 彭俊[1] 吴京[2] 张晓刚[2] TAO Dehuai;XIE Luqi;PENG Jun;WU Jing;ZHANG Xiaogang(China Railway Siyuan Survey and Design Institute Group Co.,Ltd.,Wuhan 430063,China;National Research Center for Prestressed Engineering Technology,Southeast University,Nanjing 211189,China)
机构地区:[1]中铁第四勘察设计院集团有限公司,武汉430063 [2]东南大学国家预应力工程技术研究中心,南京211189
出 处:《建筑结构》2024年第22期100-105,共6页Building Structure
基 金:国家自然科学基金项目(52308483);中铁第四勘察设计院集团有限公司科研项目(2019K128)。
摘 要:针对预应力混凝土框架梁预应力效应开展理论和数值分析,指出了将预应力混凝土框架梁简化为固定翼缘宽度线性构件的方法存在局限性。建立了梁板结构实体模型,分别施加竖向荷载和轴向等效集中力,对楼板内的正应力分布情况展开分析。结果表明:在框架梁承受轴向力时,楼板承受正应力的范围沿梁长度方向存在显著的不均匀分布现象,常用的线框模型无法准确反映梁正应力分布。分别建立了梁板结构的实体模型、固定翼缘宽度梁线框模型和梁板结合模型,对模型施加预应力等效荷载,并进行预应力效应对比分析。结果表明:固定翼缘宽度梁线框模型无法考虑楼板约束引起的梁内次轴力,导致其在变形和裂缝宽度分析中存在较大误差;实体模型分析准确但时间成本过高;梁板结合计算模型可以充分考虑肋梁在板约束下产生的次轴力效应,可实现以较小的分析成本准确计算内力和变形。The theoretical and numerical analysis of the prestressed effect in prestressed concrete frame beams was carried out.It was pointed out that the method of simplifying prestressed concrete frame beams into linear members with fixed flange width has limitations.The solid model of beam-slab structure was established,and the vertical load and axial equivalent concentrated force were applied respectively.The normal stress distribution in the slab was analyzed.The results show that when the frame beam is subjected to axial force,there is a significant non-uniform distribution of the normal stress range of the floor along the length direction of the beam,and the commonly used linear frame model cannot accurately reflect the normal stress distribution in the beam.The solid model of the beam-slab structure,the linear frame model of the fixed beam flange width and the beam-slab combined model were established respectively.The prestressed loads were applied on these models and the prestress effect in these three models were compared.The results show that the linear frame model of the fixed beam flange width cannot consider the secondary axial force in the beam caused by the floor constraint,which leads to a large error in the analysis of deformation and crack width.The solid model analysis is accurate but the time cost is too high.Beam-slab combined model can fully consider the secondary axial force effect in the ribbed beam under the plate constraint,and can accurately calculate the internal force and deformation with less analysis cost.
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