轴向约束混凝土短柱受火后抗震性能试验研究

发布时间：2018-02-26 23:20

本文关键词： 钢筋混凝土短柱受火试验拟静力试验抗震性能轴向约束　出处：《建筑结构学报》2015年06期 　论文类型：期刊论文

【摘要】：为研究高温下混凝土短柱的持荷和端部轴向约束对受火后混凝土短柱抗震性能的影响,进行了10根受火1 h后混凝土短柱和2根未受火对比柱的拟静力试验,分析了轴向约束、持荷、轴压比和剪跨比等因素对受火后混凝土短柱的破坏形态、峰值荷载、延性和耗能的影响。结果表明:高温下未持荷短柱、高温下持荷短柱和高温下轴向约束短柱受火1 h后峰值荷载均显著降低,是未受火时的67.7%~75.3%。高温下初始轴压比为0.2时,高温下轴向约束短柱、高温下持荷短柱的高温后峰值荷载分别为高温下未持荷短柱的92.0%~99.9%、99.5%~102.2%。随着轴压比的增大,高温下轴向约束混凝土短柱的附加轴压力减小,高温后受剪承载力增大。当受火时间不超过1 h且轴压比不超过0.3时,受火后混凝土短柱的受剪承载力评定可不考虑高温下持荷和轴向约束的影响。
[Abstract]:In order to study the effect of the bearing capacity of concrete short columns under high temperature and the axial restraint at the end on the seismic behavior of concrete short columns after fire, the pseudostatic tests of 10 concrete short columns and 2 unburned contrast columns after 1 hour of fire were carried out, and the axial constraints were analyzed. The effects of such factors as load holding, axial compression ratio and shear span ratio on failure form, peak load, ductility and energy dissipation of concrete short columns after fire. The peak load of the short column under high temperature and that of the short column confined in axial direction at high temperature after fire for 1 hour is 67.775. 3. The initial axial pressure ratio at high temperature is 0.2, and the axial confined short column at high temperature. The peak loads of short columns under high temperature are 92.0 and 99.5 respectively. With the increase of axial compression ratio, the additional axial pressure of axially confined concrete short columns decreases at high temperature. When the fire time is less than 1 h and the axial compression ratio is not more than 0.3, the shear capacity of concrete columns after fire can be evaluated without considering the influence of holding capacity and axial constraint at high temperature.
【作者单位】：华侨大学土木工程学院;厦门理工学院材料科学与工程学院;
【基金】：福建省科技计划重点项目(2014Y0033) 华侨大学中青年教师科研提升项目(ZQN-YX204)
【分类号】：TU375.3;TU352.11

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