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工程力学  2014 

基于荷载长期效应RAC梁裂缝宽度计算方法研究

DOI: doi:10.6052/j.issn.1000-4750.2012.12.0974

Keywords: 再生混凝土梁,裂缝宽度,长期试验,计算方法,时变系数

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Abstract:

通过对不同取代率时再生混凝土(RAC)梁裂缝宽度进行长期加载试验研究,分析了短长期荷载作用下正截面裂缝随时间变化而发展的规律.研究表明:长期荷载作用下,再生混凝土裂缝较普通混凝土的快增长时期出现显著“后延”特点,且增长期持续时间变长.以试验结果为依据,拟合回归出内力臂系数、平均裂缝间距、钢筋应变不均匀系数计算公式,建立了以综合法为理论基础的短期裂缝最大宽度计算公式,通过多方数据校核满足计算精度,结合长期裂缝宽度附加时变系数,提出不同取代率时再生混凝土梁最大裂缝宽度计算公式.

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