钢筋钢纤维混凝土连梁的裂缝和破坏形态
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摘要
通过采用低周反复加载的方法,对6个不同钢纤维体积率的钢筋钢纤维混凝土连梁和6个不同钢纤维混凝土强度等级的钢筋钢纤维混凝土连梁进行了试验研究。分析了钢纤维体积率和钢纤维混凝土强度等级对钢筋钢纤维混凝土连梁开裂荷载、裂缝发展和破坏形态等的影响。结果表明,钢纤维能够约束连梁的裂缝发展,改善连梁的破坏形态,明显提高连梁的开裂荷载,当钢纤维体积率从0增加到2.5%时,开裂荷载最大增幅为33.3%。
Tests on twelve steel fiber reinforced concrete coupling beams were conducted under low frequency cyclic loading,six of the beams with different volume fractions of steel fibers and the other with different steel fiber concrete strengths.The effects of steel fiber volume fractions and concrete strengths on crack load,crack development and failure patterns of the steel fiber reinforced concrete coupling beams were analyzed.The results show that steel fibers can restrain the crack development,improve the failure patterns and increase the crack load.When the steel fiber volume fractions increase to 2.5%,the maximum increment of crack load is 33.3%.
Tests on twelve steel fiber reinforced concrete coupling beams were conducted under low frequency cyclic loading,six of the beams with different volume fractions of steel fibers and the other with different steel fiber concrete strengths.The effects of steel fiber volume fractions and concrete strengths on crack load,crack development and failure patterns of the steel fiber reinforced concrete coupling beams were analyzed.The results show that steel fibers can restrain the crack development,improve the failure patterns and increase the crack load.When the steel fiber volume fractions increase to 2.5%,the maximum increment of crack load is 33.3%.
引文
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[2]Park W-S,Yun H-D.Seismic behaviour and design of steel coupling beams in a hybrid coupled shear wall systems[J].Nucl Eng Design,2006,236(23):2474-2484.
[3]Yun H-D,Kim S-W,Jeon E,et al.Effects of fiber-reinforced cement composites’ductility on the seismic performance of short coupling beams[J].Mag Concrete Res,2008,60(3):223-233.
[4]Hindi R A,Hassat M.Shear capacity of diagonally reinforced coupling beams[J].Eng Struct,2004,26(10):1437-1446.
[5]董宏英,曹万林,胡国振,等.不同跨高比连梁带暗支撑双肢剪力墙抗震性能试验研究[J].地震工程与工程振动,2005,25(1):92-96.Dong Hongying,Cao Wanlin,Hu Guozhen,et al.Experimental study on seismic performance of RC coupled shear wall with concealed bracings in different span-height-ratio of lintel beam[J].Earthq Eng Eng Vibrat,2005,25(1):92-96.(in Chinese)
[6]高丹盈,赵军,朱海堂.钢纤维混凝土设计与应用[M].北京:中国建筑工业出版社,2002.Gao Danying,Zhao Jun,Zhu Haitang.The Design and Application of Steel Fiber Concrete[M].Beijing:China Construction Industry Press,2002.(in Chinese)
[7]张宏战,张瑞瑾,黄承逵.钢纤维高强混凝土连梁抗剪试验研究[J].土木工程学报,2007,40(11):15-22.Zhang Hongzhan,Zhang Ruijin,Huang Chengkui.Shear test on steel fiber reinforced high strength concrete coupling beam[J].Civil Eng J,2007,40(11):15-22.(in Chinese)
[8]赵军,张明,邱计划.钢纤维部分增强混凝土剪力墙正截面抗裂计算方法[J].中国科技论文在线,2011,6(5):337-341.Zhao Jun,Zhang Ming,Qiu Jihua.Calculation method cross-section crack-resistance of steel fiber partially reinforced concrete shear wall[J].Sciencepaper Online,2011,6(5):337-341.(in Chinese)
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