基于修正滑移刚体模型的挡块抗震强度预测及其应用

发布时间：2019-08-20 13:20

【摘要】：基于挡块脆性斜剪破坏的震害,提出"限制挡块破坏范围"和"提高挡块塑性变形能力"两个预期目标,开展了两个系列试验研究,并通过使挡块发生滑移剪切破坏加以实现。在试验基础上,讨论了采用Bozorgzadeh滑移刚体模型预测挡块强度的适用性。分析表明在混凝土接触面粗糙度不可忽略的情况下,Bozorgzadeh模型的计算结果偏低。引入表征接触面粗糙度的混凝土粘聚力修正项,可拓宽滑移刚体模型的适用范围,结合多种文献的试验数据验证表明修正滑移刚体模型实用可靠。最后,针对滑移剪切破坏的挡块建立了抗震强度预测公式,误差分析表明该公式计算结果精确、可靠;且形式简单,便于挡块的配筋设计,具有很高的工程实用价值。
[Abstract]:Based on the earthquake damage of brittle oblique shear failure of retaining block, two expected objectives, "limiting the failure range of retaining block" and "improving the plastic deformation capacity of retaining block", are put forward, and two series of experimental studies are carried out, which are realized by sliding shear failure of retaining block. On the basis of experiments, the applicability of using Bozorgzadeh sliding rigid body model to predict the strength of block is discussed. The analysis shows that the calculation results of Bozorgzadeh model are low under the condition that the roughness of concrete contact surface can not be ignored. The application range of sliding rigid body model can be broadened by introducing concrete cohesion correction term which represents the roughness of contact surface. Combined with the test data of many literatures, it is proved that the modified sliding rigid body model is practical and reliable. Finally, the seismic strength prediction formula for sliding shear failure block is established, and the error analysis shows that the formula is accurate and reliable, and the form is simple, which is convenient for reinforcement design of retaining block and has high practical value in engineering.
【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】：山区桥梁与隧道工程国家重点实验室培养基地开放基金(CQSLBF-Y14-2) 交通运输部应用基础研究计划项目(2014319814210) 重庆交通大学校内青年科学基金(101293)
【分类号】：U442.55

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