基于修正滑移刚体模型的挡块抗震强度预测及其应用

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振动与冲击 ›› 2014, Vol. 33 ›› Issue (17) : 55-61.

论文

基于修正滑移刚体模型的挡块抗震强度预测及其应用

徐略勤1, 2，李建中2

作者信息 +

Seismic strength prediction and its application of reinforced concrete retainers based on modified rigid body sliding model

XU Lueqin1, 2，LI Jianzhong2

Author information +

文章历史 +

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

According to the seismic damage of reinforced concrete retainers subjected to brittle diagonal shear failure, two prospective targets are proposed, i.e. restriction of retainer damage scope and improvement of retainer ductile deformation capacity, and two series of experiments are designed on the retainer. The targets are realized by making the retainer sliding on the surface of the cap beam / stem wall. Based on the test results, applicability of Bozorgzadeh rigid body sliding model is discussed in predicting the strength of the retainers. Analysis reveals that Bozorgzadeh model tends to underestimate the strength of the retainer when the roughness of the concrete contact faces cannot be neglected. The applicability of rigid body sliding model can be greatly widened through introduction of a modification term which represents the cohesion forces existing in the concrete contact faces. Applying the test data from various literatures to testify the modified rigid body sliding model, calculations give accurate predictions. Finally for the retainers subjected to sliding shear failure, an analytical formula is established for predicting their seismic strengths. Error analysis tells that the formula provides accurate and reliable calculations, besides it is simple in form and very convenient for the reinforcement design of the retainer, and is therefore of significant practical value.

导出引用

徐略勤;;李建中. 基于修正滑移刚体模型的挡块抗震强度预测及其应用[J]. 振动与冲击, 2014, 33(17): 55-61

XU Lueqin;;LI Jianzhong. Seismic strength prediction and its application of reinforced concrete retainers based on modified rigid body sliding model[J]. Journal of Vibration and Shock, 2014, 33(17): 55-61