UHPC键齿+螺栓连接接缝梁抗弯性能试验研究
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摘要
为了研究预制UHPC键齿+螺栓连接接缝梁的抗弯性能,进行了6根UHPC键齿+螺栓连接接缝梁(简称接缝梁)和2根UHPC整体梁的弯曲试验,探讨梁底配筋、接缝设置钢垫板及涂抹环氧树脂胶等因素对UHPC接缝梁的破坏形式、抗弯承载力、跨中挠度、连接钢板上下缘应变和接缝相对纵向位移的影响;采用有限元软件ANSYS分析了长期压应力作用下UHPC徐变对螺栓预紧力的影响.试验及分析结果表明:UHPC接缝梁在梁底配筋不同的情况下存在接缝梁刚度突变区梁体受弯破坏和键齿楔形破坏引起的接缝破坏2种破坏模式,接缝表面涂抹环氧树脂胶对接缝梁的抗弯性能影响小,接缝两侧设置钢垫板可提高接缝的抗弯承载力,减小接缝梁的跨中挠度和接缝的上、下缘相对纵向位移,且对连接钢板的受弯变形也有一定的改善作用.长期压应力作用引起的UHPC徐变会导致螺栓预紧力下降,下降幅度可达24.7%.
To investigate the flexural performance of precast UHPC joint beams with tooth block and bolted connection,flexural test was performed on six UHPC joint beams with tooth block and bolted connection(joint beams for short)and two UHPC beams without joints. The effects of bottom-longitudinal reinforcement, steel subplate, and epoxy glue setting on joint on the failure mode, flexural strength, mid-span deflection, top-bottom-side strain of connecting steel plate and joint top-bottom-side longitudinal relative displacement of these joint beams were discussed. The effect of UHPC creep under long-time compressive stress on the pre-tightening force of bolt was analyzed by finite element software ANSYS. The results show two failure modes of UHPC joint beams with different reinforcement ratio of bottom-longitudinal reinforcement, one of which is flexural rupture of UHPC section in the region where flexural rigidity is changed, and the other is joint failure caused by wedge-shaped failure of tooth block. The effect of joint-painted epoxy glue on the flexural behavior of joint beams is negligible, and steel subplate setting on the side of joint can not only increase the flexural strength of joint and flexural performance of connecting plate, but also reduce the mid-span deflection of joint beams and joint top-bottom-side longitudinal relative displacement. The UHPC creep under long-time compressive stress can reduce the pre-tightening force of bolt by 24.7%.
To investigate the flexural performance of precast UHPC joint beams with tooth block and bolted connection,flexural test was performed on six UHPC joint beams with tooth block and bolted connection(joint beams for short)and two UHPC beams without joints. The effects of bottom-longitudinal reinforcement, steel subplate, and epoxy glue setting on joint on the failure mode, flexural strength, mid-span deflection, top-bottom-side strain of connecting steel plate and joint top-bottom-side longitudinal relative displacement of these joint beams were discussed. The effect of UHPC creep under long-time compressive stress on the pre-tightening force of bolt was analyzed by finite element software ANSYS. The results show two failure modes of UHPC joint beams with different reinforcement ratio of bottom-longitudinal reinforcement, one of which is flexural rupture of UHPC section in the region where flexural rigidity is changed, and the other is joint failure caused by wedge-shaped failure of tooth block. The effect of joint-painted epoxy glue on the flexural behavior of joint beams is negligible, and steel subplate setting on the side of joint can not only increase the flexural strength of joint and flexural performance of connecting plate, but also reduce the mid-span deflection of joint beams and joint top-bottom-side longitudinal relative displacement. The UHPC creep under long-time compressive stress can reduce the pre-tightening force of bolt by 24.7%.
引文
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[2] BAYARD O,PL魪O. Fracture mechanics of reactive powder concrete:material modeling and experimental investigations[J].Engineering Fracture Mechanics,2003,70(7):839—851.
[3] MATTE V,MORANVILLE M. Durability of reactive powder composites:influence of silica fume on the leaching properties of very low water/binder pastes[J]. Cement and Concrete Composites,1999,21:1—9.
[4] TANG M G. High performance concrete-past,present and future[C]//ASTM Proceeding of 1st International Symposium on Ultra High Performance Concrete. Kassel:ASTM,2004:3—9.
[5] CHEYREZY M. Mierostmetuml analysis of RPC[J]. Cement and Concrete Research,1995,25(7):1491—1500.
[6] BURKART I. M譈LLER H S. Creep and shrinkage characteristics of ultra high strength concrete(UHPC)[C]//Proceedings of the Second International Symposium on Ultra High Performance Concrete. Kassel:Kassel University Press,2008:469—476.
[7] YEN L V,PATRICK C A,THOMAS A J T. Design and construction of a 50m single span ultra-high performance ductile concrete composite road bridge[J]. International Journal of Sustainable Construction Engineering&Technology,2012,3(1):1—17.
[8] HUH S,BYUN Y,SUN Y. Pedestrian arch bridge,Seoul,Korea[J].Structural Engineering International,2005,15(1):32—34.
[9]张策.超大跨径UHPC连续箱梁桥接缝设计及模型试验[D].长沙:湖南大学土木工程学院,2014:11—21,43—52.ZHANG C. Joint design and model tests of extra-long-span continuous box girder bridge composed of UHPC[D].Changsha:College of Civil Engineering,Hunan University,2014:11—21,43—52.(In Chinese)
[10]邵旭东,张良,张松涛,等.新型UHPC连续箱梁的体外预应力锚固构造形式研究[J].湖南大学学报(自然科学版),2016,43(3):1—7.SHAO X D,ZHANG L,ZHANG S T,et al. Study on structural forms of external prestressing anchorage for a noval continuous UHPC box-gieder bridge[J]. Journal of Hunan University(Natural Sciences),2016,43(3):1—7.(In Chinese)
[11]GB 50017—2003钢结构设计规范[S].北京:人民交通出版社,2003:70—71.GB 50017—2003 Code for design of steel structures[S]. Beijing:China Architecture&Building Press,2003:70—71.(In Chinese)
[12]JGJ 82—2011钢结构高强度螺栓连接技术规程[S].北京:中国建筑工业出版社,2011:28—30.JGJ 82—2011 Technical specification for high strength bolt connections of steel structures[S]. Beijing:China Architecture&Building Press,2011:28—30.(In Chinese)
[13]张阳,鲍超,刘榕.预制RPC柱降低大跨PC刚构桥跨中长期下挠分析[J].湖南大学学报(自然科学版),2016,43(3):8—14.ZHANG Y,BAO C,LIU R. Analysis of precast RPC column on reducing long-term mid-span deflection of rigid frame bridge[J].Journal of Hunan University(Natural Sciences),2016,43(3):8—14.(In Chinese)
[14]冷文华.预应力钢壳混凝土桥塔受力分析[D].长沙:湖南大学土木工程学院,2012:31—34.LENG W H. Structural analysis of prestressed steel-concrete composite pylon[D]. Changsha:College of Civil Engineering,Hunan University,2012:31—34.(In Chinese)
[15]JTGD62—2004公路钢筋混凝土及预应力混凝土桥涵设计规范[S].北京:人民交通出版社,2004:118—120.JTGD62—2004 Code for design of highway reinforced concrete and prestressed concrete bridge and culverts[S]. Beijing:China Communications Press,2004:118—120.(In Chinese)
[16]ZHANG Y,ZHU P,ZHU Y P,et al. NC-UHPC composite structure for long-term creep-induced deflection control in continuous boxgirder bridges[J]. Journal of Bridge Engineering,2018,23(6):04018034-5-04018034-6.