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。
Based on seismic damages of reinforced concrete retainers subjected to brittle diagonal shear failure, two prospective targets including restriction scope of retainer damage and improvement of retainer ductile deformation capacity were proposed. Two series of tests were conducted. The targets were realized by making retainers slide on the surface of a cap beam / a stem wall. Based on the test results, the applicability of Bozorgzadeh rigid body sliding model was discussed for predicting the strength of the retainers. Analysis revealed that Bozorgzadeh model tends to under-estimate the strength of the retainers when the roughness of concrete contact surfaces cannot be neglected. The applicability of the rigid body sliding model was widened through inducing a modification term representing cohesion forces existing on concrete contact surfaces. Applying test data from various literatures to testify the modified rigid body sliding model, it gives accurate predictions. Finally, for the retainers subjected to sliding shear failure, an analytical formula was established for predicting their aseismic strengths. Error analysis showed that the formula provides accurate and reliable results, it is simple in form and very convenient for the reinforcement design of retainers, and has a significant practical value.
出处
《振动与冲击》
EI
CSCD
北大核心
2014年第17期55-61,共7页
Journal of Vibration and Shock
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)
关键词
桥梁工程
修正滑移刚体模型
试验
钢筋混凝土挡块
抗震强度
bridge engineering
modified rigid body sliding model
tests
reinforced concrete retainer
aseismic strength