钢筋混凝土构件模型的配筋率及保护层厚度研究
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摘要
运用相似性原理,对钢筋混凝土轴心受压、大偏心受压柱以及钢筋混凝土梁的强度相似条件进行推导,确定了模型试验中模型构件配筋率及混凝土保护层厚度的理论取值,并采用误差分析方法分析了模型混凝土保护层厚度取值对承载力相似性的影响.分析表明,在进行钢筋混凝土构件模型试验时,宜采用与原型相同的配筋率.对于轴心受压柱,模型保护层厚度不产生误差;对于钢筋混凝土梁,模型保护层厚度取原型保护层厚度除以0.5倍比例系数,此时误差可以控制在10%;对于大偏压柱,建议保护层厚度取原型保护层厚度除比例系数.
Similarity principle was applied to obtain the certain conditions of strength similarity among reinforced concrete column and beam under axial compression,and compression with large eccentricity.The theoretical values of the reinforcement ratio and the thickness of concrete cover were derived,and by selecting the thickness of concrete cover of the model on the bearing capacity,the influence of similar errors was analyzed.The analysis shows that the same reinforcement ratio with the prototype is appropriate for the model test in the reinforced concrete member model test.For axial compression column,the thickness of the concrete cover of the model does not have any error.For the reinforced concrete beam,the thickness of the concrete cover of the model takes prototype protective layer thickness divided by 0.5 times the proportional coefficient.The error can be controlled within 10%.For large bias column,it is suggested that the thickness of the concrete cover takes prototype protective layer thickness in addition to scale coefficient.
Similarity principle was applied to obtain the certain conditions of strength similarity among reinforced concrete column and beam under axial compression,and compression with large eccentricity.The theoretical values of the reinforcement ratio and the thickness of concrete cover were derived,and by selecting the thickness of concrete cover of the model on the bearing capacity,the influence of similar errors was analyzed.The analysis shows that the same reinforcement ratio with the prototype is appropriate for the model test in the reinforced concrete member model test.For axial compression column,the thickness of the concrete cover of the model does not have any error.For the reinforced concrete beam,the thickness of the concrete cover of the model takes prototype protective layer thickness divided by 0.5 times the proportional coefficient.The error can be controlled within 10%.For large bias column,it is suggested that the thickness of the concrete cover takes prototype protective layer thickness in addition to scale coefficient.
引文
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[3]陈星烨,颜东煌,马晓燕.斜拉桥试验模型相似性推导与动力问题的数值分析[J].岩土力学与工程学报,2006,25(1):3206-3211.CHEN Xing-ye,YAN Dong-huang,MA Xiao-yan.Similaritydeduction of test model and numerical analysis of dynamical is-sues for cable-stayed bridge[J].Chinese Journal of Rock Me-chanics and Engineering,2006,25(1):3206-3211.(In Chi-nese)
[4]张敏政.地震模型试验中相似律应用的若干问题[J].地震工程与工程振动,1997,17(2):52-58.ZHANG Min-zheng.Study on similitude laws for shaking ta-ble tests[J].Earthquake Engineering and Engineering Vibra-tion,1997,17(2):52-58.(In Chinese)
[5]TIMOTHY Hasselman.Quantification of uncertainty in struc-tural dynamic models[J].Journal of Aerospace Engineering,2001,14(4):158-165.
[6]张敏政,孟庆利,刘晓明.建筑结构的地震模拟试验研究[J].工程抗震,2003,12(4):31-35.ZHANG Min-zheng,MENG Qing-li,LIU Xiao-ming.Earth-quake simulation experimental research on building structure[J].Erthquake Resistant Engineering,2003,12(4):31-35.(In Chinese)
[7]ZHU Hong-ping,HAO Xing-zhou.Comparison of analyticalapproaches to structural model updating using model test date[C]//Eavth&Space 2006:Engineering,Construction,andOperations in Challenging Environment.Houston:AmericanSociety of Civil Engineers,2006:1-8.
[8]HARRIS Harry G.Dynamic modeling of concrete structures[M].Detroit:American Concrete Institute,1982.
[9]孟庆利,黄思凝,郭迅.钢筋混凝土结构小比例尺模型的相似性研究[J].世界地震工程,2008,24(4):1-6.MENG Qing-li,HUANG Si-ning,GUO Xun.Research onsimilarity of small scale reinforced concrete structural model[J].World Earthquake Engineering,2008,24(4):1-6.(InChinese)
[10]GB 50010-2010混凝土结构设计规范[S].北京:中国建筑工业出版社,2010.GB 50010-2010 Code for design of concrete structures[S].Beijing:China Building Industry Press,2010.(In Chinese)
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