{"title":"Aspects of Seismic Evaluation and Retrofit of Canadian Bridges","authors":"D. Mitchell","doi":"10.14359/11933","DOIUrl":"https://doi.org/10.14359/11933","url":null,"abstract":"This paper presents the approach for seismic evaluation and guidelines for seismic retrofit of the Canadian Highway Bridge Design code. A number of common seismic deficiencies found in bridge structures are discussed. The reversed cyclic loading behavior of columns with lap splices at their bases, outrigger beam-column connections, and columns with hinges at their bases are discussed. Methods suitable for retrofit of a number of these deficiencies are described. The responses of these elements after these retrofit strategies were carried out are also presented.","PeriodicalId":415348,"journal":{"name":"SP-197: S.M. Uzumeri Symposium - Behavior and Design of Concrete Structures for Seismic Performance","volume":"417 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122851604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Recently Identified Aspects of Ductile Seismic Torsional Responcse of Reinforced Concrete Buildidngs","authors":"T. Paulay","doi":"10.14359/11925","DOIUrl":"https://doi.org/10.14359/11925","url":null,"abstract":"With few exceptions, code provisions relevant to torsional phenomena in structures subjected to seismic effects are based on elastic structural behavior. The key parameter is stiffness eccentricity. The appropriateness of this approach to the design of systems expected to respond in a ductile manner is questioned. The degree of restraint with respect to system twist, strength eccentricity and the pattern of element yield displacements are considered to be more important parameters. For the purposes of seismic design, bilinear force-displacement approximations of the elastoplastic behavior of reinforced concrete systems and their constituent elements, are considered to be adequate. Strategies aiming at the elimination of undesirable effects of torsional phenomena in ductile systems are addressed. The findings of this study are based on a re-definition of some common terms of structural engineering, such as stiffness, yield displacement, and displacement ductility relationships. Contradictions with corresponding terms applicable to elastic systems are given. The introduction of these features, relevant to bilinear modeling of reinforced concrete elements, precedes the examination of the designer's options for the control of earthquake-induced displacement demands resulting in system translations and twist.","PeriodicalId":415348,"journal":{"name":"SP-197: S.M. Uzumeri Symposium - Behavior and Design of Concrete Structures for Seismic Performance","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114144684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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