尺寸效应对钢筋混凝土桥墩抗震性能影响的试验研究

发布时间：2018-01-19 18:18

本文关键词： 钢筋混凝土桥墩拟静力试验尺寸效应纵筋滑移延性　出处：《振动与冲击》2014年18期 　论文类型：期刊论文

【摘要】：通过两个符合相似关系的钢筋混凝土桥墩水平低周往复加载试验,分析尺寸效应对桥墩抗震性能影响。依据量纲原理,分别比较试件墩顶力-位移曲线、墩底塑性区截面弯矩-曲率曲线、墩顶滑移位移分量及桥墩能量耗散能力,结果表明,两试件墩顶水平抗力、截面抵抗弯矩和曲率延性基本符合相似关系,无明显尺寸效应;但由于纵筋粘结滑移的三维影响,缩尺试件墩顶水平位移包含较大滑移位移分量,同比耗能偏低,尺寸效应显著。基于此,针对弯曲主导破坏桥墩,根据简化曲率分布模型和纵筋滑移模型,分别计算墩顶弯曲位移和滑移位移分量,推导给出模型试验中桥墩位移延性的建议反演公式。
[Abstract]:Through two horizontal low-cycle reciprocating tests of reinforced concrete pier, the effect of size effect on the seismic performance of pier is analyzed. According to the dimensional principle, the top load-displacement curves of the pier are compared respectively. The results show that the horizontal resistance of the pier top, the resistance moment and curvature ductility of the two test piers basically accord with the similar relationship among the bending moment and curvature ductility of the piers in the plastic zone of the pier bottom, the displacement component of the top slip of the pier and the energy dissipation ability of the bridge pier. No obvious size effect; However, due to the three-dimensional effect of longitudinal bar bond slip, the horizontal displacement at the top of the pier of the scale specimen contains larger slip displacement component, and the energy consumption is low compared with the previous year, and the size effect is significant. Therefore, the bridge pier is destroyed mainly by bending. Based on the simplified curvature distribution model and the longitudinal bar slip model, the bending displacement and slip displacement components of the pier top are calculated, respectively, and the suggested inversion formulas for the displacement ductility of the pier in the model test are derived.
【作者单位】：北京交通大学土木建筑工程学院;
【基金】：铁道部科技研究开发计划课题(2012G013-G) 优秀博士生创新基金(2012YJS074) 国家重点研究计划“973”项目(2013CB036203)
【分类号】：U443.22;U442.55
【正文快照】： 对于钢筋混凝土桥梁结构,使桥墩在地震作用下发生预期的弯曲延性,是保证桥梁在强震作用下具备足够耗能能力和预防倒塌的重要方法。为能合理计算和控制桥墩延性能力,国内外学者进行了大量研究,其中,由于钢筋混凝土墩柱非线性破坏过程受许多复杂因素影响,模型试验成为研究结构抗

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