超高强钢筋工程用水泥基复合材料梁受弯计算理论
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摘要
以工程用水泥基复合材料及超高强钢筋的应力-应变本构关系为基础,根据平均应变的平截面假定和梁受拉区ECC不退出工作等假定,建立超高强钢筋ECC梁正截面受弯计算理论,得到了开裂弯矩、屈服弯矩、极限弯矩、界限配筋率和最小配筋率的计算方法。最后,通过文献中的试验结果验证了本文计算理论的合理性。
A new type of reinforced Engineered Cementitious Composites(ECC)beam was proposed with ultra high strength bars,named ultra high strength rebar reinforced ECC beam(UHSRRE). The tensile bearing capacity of ultra high strength reinforcement was expected to be efficiently utilized until the requirements of serviceability limit state were not met in UHSRRE. Theoretical analysis on the flexural behavior of UHSRRE was conducted. Three kinds of moments at different phases,including cracking moment,yielding moment and ultimate moment,were estimated with three fundamental hypotheses to calculate the flexural capacity. These hypotheses were the constitutive relationships of ECC and ultra high strength rebar,plane section assumption of mean strain,and the tensile stress of ECC in the tensile area of beam. In addition,the requirements of boundary and minimum reinforcement ratio were defined. These theoretical models were verified by the experimental results.
A new type of reinforced Engineered Cementitious Composites(ECC)beam was proposed with ultra high strength bars,named ultra high strength rebar reinforced ECC beam(UHSRRE). The tensile bearing capacity of ultra high strength reinforcement was expected to be efficiently utilized until the requirements of serviceability limit state were not met in UHSRRE. Theoretical analysis on the flexural behavior of UHSRRE was conducted. Three kinds of moments at different phases,including cracking moment,yielding moment and ultimate moment,were estimated with three fundamental hypotheses to calculate the flexural capacity. These hypotheses were the constitutive relationships of ECC and ultra high strength rebar,plane section assumption of mean strain,and the tensile stress of ECC in the tensile area of beam. In addition,the requirements of boundary and minimum reinforcement ratio were defined. These theoretical models were verified by the experimental results.
引文
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[18]薛会青,邓宗才.HRECC梁弯曲性能的试验研究与理论分析[J].土木工程学报,2013,46(4):1017.Xue Huiqing,Deng Zongcai.Experimental and theoretical studies on bending performance of HRECCbeams[J].China Civil Engineering Journal,2013,46(4):1017.
[2]Li V C.From micromechanics to structural engineering--the design of cementitious composites for civil engineering applications[J].Journal of Structural MechanicsandEarthquakeEngineering,1993,10(2):3748.
[3]Said S H,Razak H A.The effect of synthetic polyethylene fiber on the strain hardening behavior of engineered cementitious composite(ECC)[J].Materials and Design,2015,86:447457.
[4]Dehghani A,NateghiAlahi F,Fischer G.Engineered cementitious composites for strengthening masonry infilled reinforced concrete frames[J].Engineering Structures,2015,105:197208.
[5]Khan M I,Abbass W.Flexural behavior of highstrength concrete beams reinforced with a strain hardening cementbased composite layer[J].Construction and Building Materials,2016,125:927935.
[6]乔治,潘钻峰,梁坚凝,等.ECC/RC组合梁受弯性能试验研究与分析[J].东南大学学报:自然科学版,2017,47(4):724731.QiaoZhi,PanZuanfeng,LiangJianning,etal.Experimental study and analysis of flexural behavior of ECC/RC compositebeams[J].JournalofSoutheastUniversity(NaturalScienceEdition),2017,47(4):724731.
[7]Yuan Fang,Pan Jinlong,Dong Luoting,et al.Mechanical behaviors of steel reinforced ECC or ECC/concrete composite beams under reversed cyclic loading[J].Journal of Materials in Civil Engineering,2014,26(8):8688.
[8]Xu Shilang,Hou Lijun,Zhang Xiufang.Flexural and shear behaviors of reinforced ultrahigh toughness cementitious composite beams without web reinforcement under concentrated load[J].Engineering Structures,2012,39(10):176186.
[9]Li Qinghua,Xu Shilang.A design concept with the use of RUHTCC beam to improve crack control and durability of concrete structures[J].Materials and Structures,2011,44(6):11511177.
[10]Meng Dan,Huang Ting,Zhang Y X,et al.Mechanical behaviour of a polyvinyl alcohol fibre reinforced engineered cementitious composite(PVAECC)using local ingredients[J].Construction&Building Materials,2017,141:259270.
[11]Paegle I,Fischer G.Phenomenological interpretation of the shear behavior of reinforced engineered cementitious composite beams[J].Cement and Concrete Composites,2016,73:213225.
[12]Maalej M,Li V C.Flexural/tensile strength ratio in engineered cementitious composites[J].Journal of Materials in Civil Engineering,1994,6(4):513528.
[13]Zhou Jiajia,Pan Jinlong,Leung C K Y.Mechanical behavior of fiberreinforced engineered cementitious composites in uniaxial compression[J].Journal of Materials in Civil Engineering,2014,27(1):04014111.
[14]Mohammed B S,Nuruddin M F,Aswin M,et al.Structural behavior of reinforced selfcompacted engineered cementitious composite beams[J].Advances in Materials Science and Engineering,2016,225:112.
[15]Noushini A,Samali B,Vessalas K.Ductility and damping characteristics of PVAFRC beam elements[J].Advances in Structural Engineering,2015,18(11):17631788.
[16]Cai Jingming,Pan Jinlong,Yuan Fang.Experimental and numerical study on flexural behaviors of steel reinforced engineered cementitious composite beams[J].Journal of Southeast University,2014,30(3):330335.
[17]Yuan Fang,Pan Jinglong,Wu Yufei.Numerical study on flexural behaviors of steel reinforced engineered cementitious composite(ECC)and ECC/concrete composite beams[J].Science China Technological Sciences,2014,57(3):637645.
[18]薛会青,邓宗才.HRECC梁弯曲性能的试验研究与理论分析[J].土木工程学报,2013,46(4):1017.Xue Huiqing,Deng Zongcai.Experimental and theoretical studies on bending performance of HRECCbeams[J].China Civil Engineering Journal,2013,46(4):1017.