基于转动刚体模型的钢筋混凝土挡块抗震强度预测

发布时间：2019-02-20 19:57

【摘要】：在拟静力试验基础上,根据挡块的破坏现象、钢筋的应变分布规律、以及挡块的力-变形关系曲线识别了挡块的两种典型破坏形态,即斜截面剪切破坏和连接面剪切破坏。引入转动刚体的假设模拟挡块的破坏机制,提出混凝土和钢筋强度贡献的两个独立分项,分别建立了两种破坏形态下挡块的抗震强度预测模型。两个模型本质上一致,但受力模式有别。斜截面转动刚体模型中挡块的强度主要来自混凝土、剪切钢筋、水平拉筋和水平构造筋的贡献;而连接面转动刚体模型主要来自混凝土和剪切钢筋。两个模型不仅可体现挡块尺寸、材料特性、钢筋数量等基本参数的影响,也可反映加载位置、钢筋位置等因素的作用。误差分析表明两个模型计算结果精确、可靠,可为挡块的抗震设计计算提供参考。
[Abstract]:On the basis of quasi-static test, according to the failure phenomenon of retaining block, the strain distribution law of steel bar and the force-deformation relation curve of retaining block, two typical failure modes of retaining block are identified, that is, shear failure of oblique section and shear failure of connection plane. The failure mechanism of block is simulated by the assumption of rotating rigid body. Two independent sub-items of strength contribution of concrete and steel bar are put forward, and the prediction models of seismic strength of block under two kinds of failure patterns are established respectively. The two models are essentially the same, but the stress modes are different. The strength of block is mainly from the contribution of concrete, shear bar, horizontal tension bar and horizontal structural reinforcement in the skew section rotation rigid body model, while the connection plane rotation rigid body model mainly comes from concrete and shear steel bar. The two models can not only reflect the influence of the basic parameters such as block size, material characteristics and the quantity of steel bar, but also reflect the effect of loading position and steel bar position. Error analysis shows that the calculation results of the two models are accurate and reliable, which can be used as a reference for the seismic design calculation of the block.
【作者单位】：重庆交通大学山区桥梁与隧道工程国家重点实验室培育基地;同济大学土木工程防灾国家重点实验室;
【基金】：交通运输部西部交通建设科技项目(200831800098) 国家973计划研究专项课题项目(2012CB723305) 交通运输部应用基础研究项目(2014319814210)
【分类号】：U442.55;U445.57

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