东南大学学报（自然科学版）
東南大學學報（自然科學版）
동남대학학보（자연과학판）
JOURNAL OF SOUTHEAST UNIVERSITY
2014年
1期
133-139
,共7页
侯利军%陈达%徐世烺%张秀芳
侯利軍%陳達%徐世烺%張秀芳
후리군%진체%서세랑%장수방
超高韧性水泥基复合材料(UHTCC)%配筋率%剪跨比%裂缝扩展%剪切强度
超高韌性水泥基複閤材料(UHTCC)%配觔率%剪跨比%裂縫擴展%剪切彊度
초고인성수니기복합재료(UHTCC)%배근솔%전과비%렬봉확전%전절강도
ultrahigh toughness cementitious composite (UHTCC)%reinforcement ratio%shear-span ratio%crack propagation%shear strength
为了探究超高韧性水泥基复合材料（UHTCC ）的抗剪性能，以配筋率和剪跨比为参数，对跨中荷载作用下的6根钢筋增强UHTCC（RUHTCC）梁和4根钢筋混凝土（RC）对比梁进行了受弯试验．对比研究了RUHTCC梁的抗剪性能，包括裂缝扩展形态、荷载挠度曲线、剪切开裂荷载、极限剪切能力以及剪切强度等．试验结果表明，随着配筋率的增大和剪跨比的减小，RUHTCC梁的破坏模式由弯剪破坏转变为剪压破坏，极限剪切承载能力逐渐增大．RUHTCC梁的极限剪切能力约为RC梁的2倍，平均抗剪强度约为UHTCC抗拉强度的0.86倍；RUHTCC 梁表现出稳态的多条细密斜裂缝扩展模式，在正常使用极限状态下，其最大裂缝宽度低于0.1 mm．基于RUHTCC梁良好的裂缝控制能力以及较高的富余剪切承载能力，不需设置最小配箍率．
為瞭探究超高韌性水泥基複閤材料（UHTCC ）的抗剪性能，以配觔率和剪跨比為參數，對跨中荷載作用下的6根鋼觔增彊UHTCC（RUHTCC）樑和4根鋼觔混凝土（RC）對比樑進行瞭受彎試驗．對比研究瞭RUHTCC樑的抗剪性能，包括裂縫擴展形態、荷載撓度麯線、剪切開裂荷載、極限剪切能力以及剪切彊度等．試驗結果錶明，隨著配觔率的增大和剪跨比的減小，RUHTCC樑的破壞模式由彎剪破壞轉變為剪壓破壞，極限剪切承載能力逐漸增大．RUHTCC樑的極限剪切能力約為RC樑的2倍，平均抗剪彊度約為UHTCC抗拉彊度的0.86倍；RUHTCC 樑錶現齣穩態的多條細密斜裂縫擴展模式，在正常使用極限狀態下，其最大裂縫寬度低于0.1 mm．基于RUHTCC樑良好的裂縫控製能力以及較高的富餘剪切承載能力，不需設置最小配箍率．
위료탐구초고인성수니기복합재료（UHTCC ）적항전성능，이배근솔화전과비위삼수，대과중하재작용하적6근강근증강UHTCC（RUHTCC）량화4근강근혼응토（RC）대비량진행료수만시험．대비연구료RUHTCC량적항전성능，포괄렬봉확전형태、하재뇨도곡선、전절개렬하재、겁한전절능력이급전절강도등．시험결과표명，수착배근솔적증대화전과비적감소，RUHTCC량적파배모식유만전파배전변위전압파배，겁한전절승재능력축점증대．RUHTCC량적겁한전절능력약위RC량적2배，평균항전강도약위UHTCC항랍강도적0.86배；RUHTCC 량표현출은태적다조세밀사렬봉확전모식，재정상사용겁한상태하，기최대렬봉관도저우0.1 mm．기우RUHTCC량량호적렬봉공제능력이급교고적부여전절승재능력，불수설치최소배고솔．
In order to understand the shear behavior of ultrahigh toughness cementitious composite (UHTCC),the bending tests on six reinforced UHTCC (RUHTCC)beams and four reinforced con-crete (RC)comparison beams were performed under a concentrated loading at mid-span.The varied parameters were the shear-span ratio and the reinforcement ratio.The shear responses of the RU-HTCC beams and those of the RC beams were compared,including the diagonal crack pattern,the load-deflection curve,the shear cracking load,the ultimate shear capacity and the shear strength, etc.The experimental results indicate that with the increase in the reinforcement ratio and the de-crease in the shear-span ratio,the failure mode of the RUHTCC beams transforms from flexure-shear to shear-compression and the ultimate shear capacity rises gradually.The ultimate shear capacity of the RUHTCC beams is about twice that of the RC beams,and the average ultimate shear strength of the RUHTCC beams is about 0.86 times that of the ultimate tensile strength of the UHTCC.The RUHTCC beams present the stable propagation of multiple fine diagonal cracks,with the maximum crack width below 0.1 mm under the ultimate service condition.The minimum web reinforcement ratio is not required for the RUHTCC beams due to its large post-cracking reserve shear capacity and fine crack controlling capability.
