高强钢筋轻骨料混凝土梁短期裂缝试验研究
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摘要
进行了10根配置400MPa和500MPa高强纵筋的陶粒轻骨料混凝土梁受弯性能试验,获得了10组裂缝间距和39组短期裂缝宽度数据,并收集了国内外27根高强钢筋轻骨料混凝土梁的裂缝试验数据。采用以上数据,分析了钢筋轻骨料混凝土梁的裂缝特征,并评估了JGJ 12—2006《轻骨料混凝土结构技术规程》中裂缝计算公式的适用性。结果表明,JGJ12—2006的短期裂缝特征值计算方法仍适用于高强钢筋轻骨料混凝土梁,但按其公式计算的平均裂缝间距、平均裂缝宽度和最大裂缝宽度与试验值有一定偏差,二者之比的均值为0. 992、1. 276和1. 037,因此建议对JGJ 12—2006中公式的部分参数进行修正。通过对试验数据的回归分析,得到了梁侧面受拉纵筋中心处裂缝宽度的修正计算式,以及梁侧面受拉钢筋中心处与受拉边缘裂缝宽度的换算关系式,建议公式计算得到的裂缝宽度和试验值吻合较好。
Tests were conducted to investigate the flexural behavior of ten ceramsite lightweight concrete beams reinforced with 400 MPa and 500 MPa high-yield strength rebars were tested. Ten crack spacing data and 39 short-term crack width data were obtained from these tests. Meanwhile,the other cracking test results of 27 lightweight concrete beams reinforced with high-yield strength rebar were collected at home and abroad. Based on the cracking test data,the characteristics of cracks in reinforced lightweight concrete beams were analysed. The formulae for the crack width of reinforced lightweight concrete beam specified in JGJ 12—2006 ‘Technical specification for lightweight aggregate concrete structures' was evaluated using the test data. The analysis results show that the calculating method for shortterm crack width in JGJ 12-2006 is adaptable to lightweight concrete beams reinforced with high-yield strength rebar,but the values calculated according to JGJ 12—2006 of average crack spacing,average crack width and maximum crack width in general are deviated from those test values with the average ratios of 0. 992,1. 276 and 1. 037. So it is necessary to revise some parameters of the formulae. Using regression analysis,the revised formulae for the crack width at the centre of tensile longitudinal rebar on the side of the beam were suggested. Conversion formulas for the average crack width at the position of tensile steel rebar and the tensile edge was proposed. The calculated values obtained by the proposed formulae are in good agreement with the test results.
Tests were conducted to investigate the flexural behavior of ten ceramsite lightweight concrete beams reinforced with 400 MPa and 500 MPa high-yield strength rebars were tested. Ten crack spacing data and 39 short-term crack width data were obtained from these tests. Meanwhile,the other cracking test results of 27 lightweight concrete beams reinforced with high-yield strength rebar were collected at home and abroad. Based on the cracking test data,the characteristics of cracks in reinforced lightweight concrete beams were analysed. The formulae for the crack width of reinforced lightweight concrete beam specified in JGJ 12—2006 ‘Technical specification for lightweight aggregate concrete structures' was evaluated using the test data. The analysis results show that the calculating method for shortterm crack width in JGJ 12-2006 is adaptable to lightweight concrete beams reinforced with high-yield strength rebar,but the values calculated according to JGJ 12—2006 of average crack spacing,average crack width and maximum crack width in general are deviated from those test values with the average ratios of 0. 992,1. 276 and 1. 037. So it is necessary to revise some parameters of the formulae. Using regression analysis,the revised formulae for the crack width at the centre of tensile longitudinal rebar on the side of the beam were suggested. Conversion formulas for the average crack width at the position of tensile steel rebar and the tensile edge was proposed. The calculated values obtained by the proposed formulae are in good agreement with the test results.
引文
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[12]赵勇,王晓峰,程志军,周建民.高强钢筋混凝土梁短期裂缝计算方法评析[J].建筑结构学报,2011,32(1):50-57.(ZHAO Yong,WANG Xiaofeng,CHENGZhijun,ZHOU Jianmin.Calculation method for shortterm crack of reinforced concrete beams with highstrength steel bars[J].Journal of Building Structures,2011,32(1):50-57.(in Chinese))
[13]混凝土结构设计规范:GB 50010-2010[S].2015版.北京:中国建筑工业出版社,2016.(Code for design of concrete structures:GB 50010-2010[S].2015 ed.Beijing:China Architecture&Building Press,2016.(in Chinese))
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[15]ACI 318 Committee.Building code requirements for structural concrete(ACI 318-14)and commentary(ACI 318R-14)[S].Farmington Hills,MI:American Concrete Institute,2014.
[16]FROSCH R J.Another look at cracking and crack control in reinforced concrete[J].ACI Structural Journal,1999,96(3):437-442.
[2]LIM H S.Structural response of LWC beams in flexure[D].Singapore:National University of Singapore,2007.
[3]WU C H,KAN Y C,HUANG C H,YEN T,CHEN L H.Flexural behavior and size effect of full scale reinforced lightweight concrete beam[J].Journal of Marine Science&Technology,2011,19(2):132-140.
[4]丁大钧,金芷生,黄德富,庞同和.配筋陶粒混凝土梁的试验研究[J].南京工学院学报(土木工程专辑),1980,4(3):1-14.(DING Dajun,JIN Zhisheng,HUANG Defu,PANG Tonghe.An experimental study of ceramsite concrete beams[J].Journal of Nanjing Institute of Technology(Civil Engineering Edition),1980,4(3):1-14.(in Chinese))
[5]李鸥.高强轻集料钢筋混凝土梁抗弯力学性能试验研究[D].武汉:武汉理工大学,2006.(LI Ou.Experimental study on flexural properties of reinforced high-strength lightweight aggregate concrete beams[D].Wuhan:Wuhan University of Technology,2006.(in Chinese))
[6]许佳修,蔡华,邵永健,等.高强轻骨料混凝土梁的试验研究[J].建筑结构,2006,36(11):97-99.(XUJiaxiu,CAI Hua,SHAO Yongjian,et al.Experimental research on high strength light weight aggregate concrete beams[J].Building Structure,2006,36(11):97-99.(in Chinese))
[7]莫振林.陶粒混凝土梁受弯性能的试验研究[D].长沙:长沙理工大学,2008.(MO Zhenlin.Experimental study on mechanical properties of ceramisite concrete beam under flexure[D].Changsha:Changsha University of Science and Technology,2008.(in Chinese))
[8]归强.轻骨料混凝土受弯梁力学性能试验研究[D].天津:天津大学,2008.(GUI Qiang.Experimental study on mechanical properties of lightweight aggregate concrete beams under flexure[D].Tianjin:Tianjin University,2008.(in Chinese))
[9]董健苗.剑麻纤维自密实轻骨料混凝土梁裂缝宽度试验研究[J].混凝土与水泥制品,2018(11):65-69.(DONG Jianmiao.Experimental study on crack width of self-compacting lightweight aggregate concrete beams[J].China Concrete and Cement Products,2018(11):65-69.(in Chinese))
[10]成松松.考虑面力效应的端约束轻骨料混凝土梁受弯性能试验研究[J].建筑结构学报,2018,39(12):56-65.(CHENG Songsong.Flexural tests on lightweight aggregate concrete reinforced beams with boundary constraints induced membrane actions[J].Journal of Building Structures,2018,39(12):56-65.(in Chinese))
[11]轻骨料混凝土结构技术规程:JGJ 12-2006[S].北京:中国建筑工业出版社,2006.(Technical specification for lightweight aggregate concrete structures:JGJ 12-2006[S].Beijing:China Architecture&Building Press,2006.(in Chinese))
[12]赵勇,王晓峰,程志军,周建民.高强钢筋混凝土梁短期裂缝计算方法评析[J].建筑结构学报,2011,32(1):50-57.(ZHAO Yong,WANG Xiaofeng,CHENGZhijun,ZHOU Jianmin.Calculation method for shortterm crack of reinforced concrete beams with highstrength steel bars[J].Journal of Building Structures,2011,32(1):50-57.(in Chinese))
[13]混凝土结构设计规范:GB 50010-2010[S].2015版.北京:中国建筑工业出版社,2016.(Code for design of concrete structures:GB 50010-2010[S].2015 ed.Beijing:China Architecture&Building Press,2016.(in Chinese))
[14]British Standards Institution.Eurocode 2:design of concrete structures:part 1:general rules and rules for buildings:BS EN 1992-1-1[S].London:British Standards Institution,2004.
[15]ACI 318 Committee.Building code requirements for structural concrete(ACI 318-14)and commentary(ACI 318R-14)[S].Farmington Hills,MI:American Concrete Institute,2014.
[16]FROSCH R J.Another look at cracking and crack control in reinforced concrete[J].ACI Structural Journal,1999,96(3):437-442.