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ID:32135837
大小:2.66 MB
页数:70页
时间:2019-01-31
《既有桥梁抗震评估及碳纤维加固技术研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、摘要自1971年美国圣费南多地震爆发以后,结构延性抗震设计的概念在世界范围内广泛受到重视。目前新西兰、羽本、美国、欧洲等国家抗震设计都采用延性抗震设计理论。我啜抗震设计晷懿采用89规范,其中虼缘会影嗡系数掩羲了援梁结构对延性的内在要求。实际规濑中并没有延性构造保证,加之我国当前设计地震馋用相对镰低,更增搬了地震缓j;l:的怒验性。嚣此,邋甥需要慰我国溉寿撬梁的延性抗震能力谶行分析,对不满足延性要求的桥梁进行抗震加固。本文通过磅究舔梁怒健莸震评售理论与方法,提出播粱碳纤缑趣霎壤沦及方法。1、系统回顾桥梁延性抗震设计已有的艇本理论。针对延性桥梁,建立构件鳆搴延性与位移延瞧、结构嫠体延瞧与麴l警
2、鼹部延瞧、辑鬃延毪与菝弯承载力器桥梁延性与抗剪承载力之间的关系,为抗震评估提供理论依据。2、捉爨挢梁结擒遥震终嗣辑狻系数静凝念。鞠确影穗缝震搀耀螽减袈数各种因素的性质并加以定量说明,建立地震作用折减系数的简化评估方法。3、磅筑鏊蛙掇餐分据方法豹蘩零霖瑾及实憨疹骤,建立塑毪箍餐分桥的篱化评估方法。4、技终寒德凝主概念蠢发,磅窕碳纤维终紊瀵凝±静糗麓;逶_;童理论计算,证实碳纤维约束混凝土具有优异的抗震性能。5、摄摆渡上戆湃绩方法及燕潮毽论,逶矮三级设茨、强次设计琢羹
3、j,开发碳纤维加固钢筋混凝土桥梁的应用程序。6、逶避雾镄分拆谖疆,本文撬整静藐震评绩方法麓警、实溺,其有工程应用价值。关键谰:
4、延蔻抗震竣诗遮震箨焉掰减系数瑗纤缭约束潞凝±抗震评估加固方法塑性推倒分析ABSTRACTThecone∞tofanti—seismicdesignbasedonstructure’SductilityhasbeenworldwideacceptedandpaidmuchattentiontosincetheSanFemadoseismintheUnitedStatesin1971.AductilitytheoryiSadoptedinanti—seismicdesignspecificationofNewZealand,Japan,theUnitedStatesandtheEuropeco
5、untry.Ourcountryusesthe89specification,whichadoptsasyntheticaffectioncoefficientthatcoversuptheinnerrequireofductilityinbridge’Sstructure.Factuallythereisnoassuranceforductilityinthiscoefficient.Furthermore.theseismicforceiScomparativelylowerindesignthaninfact.Bothofthemnecessarilyincreasetheseism
6、icrisk,Therefore,alltheready-madebridgesmustbeurgentlyanalyzedtoassesstheiranti—seismiccapacity.ThebridgesthatCan’tmeettherequirementsofductilitymustbestrengthened.Thistextgoesintotheoriesandmethodsoftheassessmentofbridge’Santi—seismicductilityandpresentsamethodofstrengthening,whichusesthecarbonfi
7、ber.ThemainworkiSasfollows:1.Aninquiryofbasictheoriesonanti—seismicductilityinbridgedesign.Astotheductility.Iestablishtherelationshipofstructuremember’Scurvatureductilitytopotentialductilityandstructureductilityandthatofbridge’Sductilitytoanti-flexureandanti-shearcapacitytoprovidethetheoryreferenc
8、eforanti-seismicassessment.2.Presentingtheconceptofthecoemcientthatindicatesthemodificationresponseofbridge’Sstructuretoseism.Adoptingthisconcept,Icertainthenatureoffactorsandtheamountofthem,whichinfluencethecoef
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