[1]陈宗平,周山崴,梁厚燃.高温后钢筋再生混凝土梁受剪性能及斜截面承载力计算[J].自然灾害学报,2018,(05):138-150.[doi:10.13577/j.jnd.2018.0516]
 CHEN Zongping,ZHOU Shanwei,LIANG Houran.Shear behavior test and bearing capacity calculation of recycled aggregate concrete beam after high temperature[J].,2018,(05):138-150.[doi:10.13577/j.jnd.2018.0516]
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高温后钢筋再生混凝土梁受剪性能及斜截面承载力计算
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《自然灾害学报》[ISSN:/CN:23-1324/X]

卷:
期数:
2018年05期
页码:
138-150
栏目:
出版日期:
2018-10-28

文章信息/Info

Title:
Shear behavior test and bearing capacity calculation of recycled aggregate concrete beam after high temperature
作者:
陈宗平12 周山崴1 梁厚燃1
1. 广西大学 土木建筑工程学院, 广西 南宁 530004;
2. 广西大学 工程防灾与结构安全教育部重点实验室, 广西 南宁 530004
Author(s):
CHEN Zongping12 ZHOU Shanwei1 LIANG Houran1
1. College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China;
2. Key Laboratory of Disaster Prevention and Structural Safety of China Ministry of Education, Guangxi University, Nanning 530004, China
关键词:
钢筋再生混凝土高温后受剪性能承载力计算
Keywords:
after high temperaturereinforced concrete beamsshear behaviorshear section bearing capacity
分类号:
TU352.5;X93
DOI:
10.13577/j.jnd.2018.0516
摘要:
为研究高温后钢筋再生混凝土梁受剪性能,以历经最高温度、再生粗骨料取代率和混凝土强度为变化参数,设计了17个钢筋再生混凝土梁试件,并对其进行了高温处理和静力加载试验。观察了试件历经高温后外观变化和受力破坏形态,获取了承载力、刚度、损伤、延性系数及耗能等力学性能指标,深入分析了各变化参数对其受剪性能的影响规律,探讨了斜截面承载力计算方法。研究结果表明:高温后钢筋再生混凝土梁的表面颜色由灰色变棕黄、表面龟裂,质量烧失率增大,受剪破坏形态与常温下基本相同;随着温度的升高,试件受剪承载力逐渐降低,延性变差;再生粗骨料取代率对试件的承载力和刚度影响不明显;混凝土强度等级高的试件在经历高温后的承载力和初始刚度大;本文基于强度折减法提出了斜截面承载力计算方法,其结果与试验结果的吻合较好。
Abstract:
In order to study the shear behavior of reinforced recycled concrete beams after experiencing high temperature, seventeen specimens, involving three varying parameters such as temperature, recycled coarse aggregate replacement ratio and concrete strength, were designed for monotonic static test after experiencing high temperature. Based on the tests, the physical change and mechanical failure pattern of specimens after experiencing high temperature were observed, so that those important information including bearing capacity, rigidity, damage, ductility and energy dissipation of the specimens can be obtained. Furthermore, the effects of these varying parameters on the shear behavior of reinforced recycled concrete beams after experiencing high temperature were analyzed, and the calculation method for the ultimate bearing capacity for inclined section of reinforced recycled concrete beams was also discussed. The results show that the failure mode of reinforced recycled concrete beam after high temperature is similar to that at the normal temperature, but after experiencing high temperature the surface color of beam may change from gray to dark yellow and some cracks may appear on the beam surface, meanwhile, the quality ignition loss rate increases gradually. Additionally, due to the high temperature, the shear bearing capacity decreases and ductility of beam degenerates. With an increased replacement ratio, the bearing capacity and the initial rigidity vary slightly. It also indicates that the bearing capacity and the initial rigidity increase and ductility of beam develop with higher concrete strength after high temperature. This paper is based on the strength reduction method has proposed for calculating the bearing capacity for inclined section method, the results are in good agreement with experimental results.

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备注/Memo

备注/Memo:
收稿日期:2017-07-19;改回日期:2018-06-01。
基金项目:国家自然科学基金项目(51578163);广西自然科学基金重点项目(2016GXNSFDA380032)
作者简介:陈宗平(1975-),男,教授,博士,主要从事钢与混凝土组合结构、再生混凝土结构、异形柱结构等研究.E-mail:zpchen@gxu.edu.cn
更新日期/Last Update: 1900-01-01