钢筋混凝土挡块抗震性能及改进试验

发布时间：2019-01-20 16:19

【摘要】：为提高桥梁横向挡块的抗震能力,针对挡块斜截面脆性剪断破坏的震害现象,提出了"限制破坏范围"和"提高塑性变形能力"2个抗震性能目标;采用拟静力试验研究了剪切钢筋与水平拉筋的相对数量关系,以及剪切钢筋布置方式、施工缝、加载位置等对挡块性能的影响;通过回归分析拟合了挡块的滑移强度,并提出了使挡块发生滑移破坏所需满足的配筋和构造细节。研究结果表明:挡块的破坏形态分为斜截面剪切、连接面剪切、连接面滑移3种;当发生连接面滑移破坏时,挡块及盖梁本身完好无损,两者仅在连接面上产生大位移相对滑动,挡块塑性变形能力最大,且便于震害修复;挡块的滑移强度与其剪切钢筋参数之间呈近似线性关系,利于工程设计计算。
[Abstract]:In order to improve the seismic capacity of the transverse retaining block of the bridge, two seismic performance targets, "limiting the failure range" and "improving the plastic deformation capacity", are put forward in view of the seismic damage phenomenon of the embrittlement shear failure of the retaining block. The relative quantitative relationship between shear bar and horizontal tension bar is studied by pseudo-static test, and the influence of shear bar arrangement, construction joint and loading position on block performance is also studied. The slip strength of the block is fitted by regression analysis, and the reinforcement and structural details are put forward to make the block slip failure. The results show that the failure patterns of the block can be divided into three types: oblique cross section shear and joint plane slip. When the slip failure of the connection surface occurs, the block and the cover beam are intact, only the large displacement is relatively sliding on the connection surface, the plastic deformation ability of the block is the greatest, and the damage is easy to be repaired. There is an approximate linear relationship between the slip strength of the block and the parameters of the shear bar, which is propitious to the engineering design and calculation.
【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】：国家重点基础研究发展计划(“九七三”计划)项目(2012CB723305) 交通运输部应用基础研究计划项目(2014319814210) 山区桥梁与隧道工程国家重点实验室培育基地开放基金项目(CQSLBF-Y14-2)
【分类号】：U442.55

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