采用单侧面不对称方式增加补强截面对钢筋混凝土框架梁进行抗震加固,可提高既有钢筋混凝土框架梁 的抗震性能。文章设计了4个单侧面加固梁试件,即 1个原梁和新梁整体现浇试件,1个植筋方式连接试件和 2个螺栓紧固方式连接且新梁采用有粘结预应力试件,并进行了低周反复加载试验 ,采用了预应力加固梁先预 后紧和先紧后预两种连接方式研究了新增截面中预应力筋张拉及与原梁拼接先后顺序的不同对试件抗震性能 的影 响 ,在试验 的基础上 ,对 比分析 了加 固梁 的破坏 特征 、滞 回曲线 特性 、承载力 、延性 和强度退 化特征 。结 果 表明:加固梁均为弯曲破坏具有良好的抗震性能且新增截面施加预应力后残余变形约降低40%左右 ,植筋方式 得到的加固梁试件整体变形能力优于螺栓紧固连接试件 ,二者延性系数最大相差 31%。 关键词:侧面加固;框架梁;连接方式;拟静力试验;抗震性能 中图分类号 :TU375 文献标识码 :A Seismicperform ancestudy on reinforced concretefram ebeam strengthened by singlesidebeam section Liu Chunyang ,FuJing2 (1.SchoolofCivilEngineering,Shandong Jianzhu University,Jinan250101,China;2.China NuclearPower EngineeringCo.,Ltd.,Beijing100840,China) Abstract:Theexistingreinforced concreteframebeam could beretrofitted byaddingnew RC section onlyon onelateralside.Th elow cyclereversed loadingexperimentislaunched on fourspecimensto study theseismicperformanceoftheretrofittedbeam.Onespecimen isthattheoriginal beam andthe new beam isoverallcast-in—situ,onespecimenisthatthenewbeam isconnectedtotheoriginalbeam bytheanchoragesteelbars,twospecimensarethatthenew beam isconnectedtotheoriginalbeam by the high strength bohs and the new beam is also prestressed. Two connection type is further considered forthe prestressed specimen tostudytheinfluencerule ofdifferentorderofbolt-tightening and the process ofprestressed loading to the seismic perform an ce. Based on the test, the failure mode,characteristic ofthe hysteretic curves,bearing capacity, ductility,strength degradation is studied.Testresultsshow thatthefailure mode ofallspecimen isflexuralfailure and theretrofitted beam hasgood seismic performance,the residualdeform ation is reduced by degree of40% forthe existence of prestress, the deformation capacity of planting bar sepcimen is superior to the high strengthboltsconnection specimenandthedeferenceofductilitybetweenthem is31% .Experiment resultswould providegood referencesforpractical retrofitengineering. 收藕 日期 :2016—06—02 基金项 目:山东省 自然科学基金项 目(ZR2015EQ017);住房与城乡建设部科技项 目计划项 目(2014
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