| 具有端部约束的碳纤维布加固混凝土梁的高温弯矩分析 |
| |
| 引用本文： | 刘汾涛,吴波,吴耀鹏,魏德敏.具有端部约束的碳纤维布加固混凝土梁的高温弯矩分析[J].防灾减灾工程学报,2013(3):329-335. |
| |
| 作者姓名： | 刘汾涛 吴波 吴耀鹏 魏德敏 |
| |
| 作者单位： | 华南理工大学亚热带建筑科学国家重点实验室;广东水利电力职业技术学院;上海建科院上海市工程结构新技术重点实验室;西安建筑科技大学土木工程学院 |
| |
| 基金项目： | 国家自然科学基金项目(51025829、50738005);教育部科学技术研究重点项目(108106);上海市工程结构新技术重点实验室开放课题项目(2010-KF01);中央高校基本科研业务费项目(2012ZP0011)资助 |
| |
| 摘 要： | 目前国内外对混凝土结构的抗火性能评估几乎都是针对独立构件开展的,很少考虑相邻构件之间的相互约束作用。实际火灾调查与明火试验表明,结构中构件的火灾行为与独立构件有着较明显的差别。本文开展了具有端部约束的碳纤维布加固混凝土梁的高温反应分析,揭示了轴向/转动约束刚度比、梁截面尺寸、跨度、荷载比、加固量、配筋率、保护层厚度和防火涂料厚度等参数对ISO834标准升温作用下约束加固梁的梁端弯矩的影响规律。在此基础上,给出了高温下约束加固梁的梁端弯矩实用计算方法。研究表明:①随着升温时间的增加,约束加固梁的梁端弯矩总体呈现先逐渐增大而后渐趋平缓的趋势;②防火保护(即使防火涂料厚度只有10mm)对高温下约束加固梁的梁端弯矩影响显著。
|
| 关 键 词： | 高温 碳纤维布 加固混凝土梁 端部约束 弯矩 |
Bending Moment in Restrained RC Beams Strengthened with Carbon Fiber Sheets in Fire |
| |
| LIU Fen-tao,WU Bo,WU Yao-peng,WEI De-min.Bending Moment in Restrained RC Beams Strengthened with Carbon Fiber Sheets in Fire[J].Journal of Disaster Prevent and Mitigation Eng,2013(3):329-335. |
| |
| Authors: | LIU Fen-tao WU Bo WU Yao-peng WEI De-min |
| |
| Affiliation: | 1(1.State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510640,China; 2.Guangdong Technical College of Water Resources and Electric Engineering,Guangzhou 510635,China; 3.Shanghai Key Laboratory of New Technology Research on Engineering Structures,SRIBS,Shanghai 200032,China; 4.School of Civil Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,China) |
| |
| Abstract: | Current provisions in codes and standards evaluate the fire behavior of reinforced concrete(RC) structure based on the isolated structural members,i.e.slabs,beams and columns,without considering the effects of end restraints on the fire behavior.However,previous fire tests and actual fire incidents have shown that the fire behavior of structural members is obviously different from that of isolated members,due to the adjoining structural member restraint.The CFS-strengthened RC beams with elastic axial and rotational restraints at beam ends are selected for numerical parametric study,and the effects of some parameters(i.e.,axial/rotational restraint ratio,section dimensions,length,load ratio,strengthening ratio,reinforcement ratio,thickness of concrete cover,and thickness of fire insulation) on the bending moment at the ends of the restrained RC beams exposed to ISO834 standard fire are analyzed.Based on the extensive simulation results,a practical calculation method for the bending moment at the ends of the restrained beams subjected to fire is proposed.It can be found that:(1) the bending moment at the ends of the restrained beams increases gradually first and then changes gently;and(2) the bending moment at the ends of the restrained beams strengthened with CFS and with fire insulation is quite different from that without fire insulation,even in the case that the thickness of the fire insulation is only 10 mm. |
| |
| Keywords: | high temperature carbon fiber sheet strengthened reinforced concrete beam end restraint bending moment |
| 本文献已被 CNKI 等数据库收录！ |
|
