| 约束混凝土梁的升降温全过程弯矩分析 |
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| 引用本文： | 吴波,乔长江.约束混凝土梁的升降温全过程弯矩分析[J].防灾减灾工程学报,2010,30(4):353-360. |
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| 作者姓名： | 吴波 乔长江 |
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| 作者单位： | 华南理工大学亚热带建筑科学国家重点实验室,广州,510640 |
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| 基金项目： | 国家自然科学基金重点项目，国家科技支撑计划子课题，教育部科技重点项目，教育部博士点基金项目，亚热带建筑科学国家重点实验室重点研究项目 |
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| 摘 要： | 利用SAFIR程序,开展了约束混凝土梁的升降温全过程梁端弯矩分析;考察了转动约束刚度比、轴向约束刚度比、截面尺寸、荷载比、全截面配筋率和升温时间等参数对梁端弯矩的影响规律,并与单调升温时的相应规律进行对比,给出了梁端弯矩的实用计算方法。研究结果表明:对于先升温、后降温的约束混凝土梁梁端弯矩的变化,总体表现出与单调升温类似的特征,主要区别在于后期因降温作用而呈现出缓慢降低的趋势;转动约束刚度比对梁端弯矩的影响集中在升温前期,在此时段内,梁端弯矩随着转动约束刚度比的增加而增大,但增幅逐渐趋缓;升温后30 min以内,轴向约束刚度比的改变对梁端弯矩几乎没有影响;之后,梁端弯矩随着轴向约束刚度比的增加而逐渐减小。
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| 关 键 词： | 混凝土梁 端部约束 梁端弯矩 升降温过程 |
Bending Moments of Restrained RC Beams during Heating and Cooling Phases |
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| WU Bo,QIAO Chang-jiang.Bending Moments of Restrained RC Beams during Heating and Cooling Phases[J].Journal of Disaster Prevent and Mitigation Eng,2010,30(4):353-360. |
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| Authors: | WU Bo QIAO Chang-jiang |
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| Institution: | WU Bo,QIAO Chang-jiang(State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510640,China) |
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| Abstract: | Using the computer program of SAFIR,the influences of some parameters(i.e.,rotational restraint ratio,axial restraint ratio,sectional dimensions, load ratio,reinforcement ratio and heating time,etc.) on bending moments at the ends of restrained concrete beams exposed to ISO834 standard fire with cooling phase are analyzed,and compared with those exposed to ISO834 standard fire without cooling phase.Based on the simulation results,a practical calculation method for bending moments at the ends of beams subjec... |
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| Keywords: | concrete beam end restraint beam end moment heating and cooling phases |
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