{"title":"Effect of Supplemental Bonding of External Tendons and Addition of Internal Tendons on the Strength and Ductility of Post-Tensioned Segmental Bridges","authors":"A. Hindi, R. MacGregor, M. Kreger, J. Breen","doi":"10.14359/1450","DOIUrl":"https://doi.org/10.14359/1450","url":null,"abstract":"This paper reports tests of a three span reduced scale segmental box girder bridge model post-tensioned with external tendons. The objectives of this study included the determination of the effect of using external tendons discretely bonded at an intermediate diaphragm in each segment and/or using grouted internal tendons on the strength and ductility of external tendon bridges. The scope included experimentally determining and analytically predicting the external tendon maximum stress and the flexural capacity of the bridge.","PeriodicalId":163993,"journal":{"name":"SP-160: Seismic Rehabilitation of Concrete Structures","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116688324","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":"Review of Current and Proposed Seismic Design Provisions","authors":"Jerome S. B. Iffland, A. Shroff","doi":"10.14359/1508","DOIUrl":"https://doi.org/10.14359/1508","url":null,"abstract":"Synopsis: This paper summarizes the findings of a research project performed by the American Iron and Steel Institute entitled \"Technical Review of Current and Proposed Seismic Design Provisions.\" In the last several years, both New York City and the Building Officials and Code Administrators International (BOCA) have proposed and drafted seismic provisions for their respective building codes. The purpose of this study was to compare the pertinent provisions of these proposed provisions to each other and to existing building codes (UBC, SEAOC, NEHRP, and ASCE 7). In addition, the American Institute of Steel Construction has adapted seismic provisions in their Load and Resistance Factor Design Specifications. BOCA has proposed a method of adapting these LRFD Seismic provisions into its building code. This study also reviewed these proposed revisions with respect to applicability to East Coast earthquakes, especially in New York City. The impact of both the NYC and BOCA provisions on design and construction costs are also addressed.","PeriodicalId":163993,"journal":{"name":"SP-160: Seismic Rehabilitation of Concrete Structures","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129582697","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":"Revision and Upgrading of Seismic Design Specifications","authors":"R. Nutt","doi":"10.14359/1510","DOIUrl":"https://doi.org/10.14359/1510","url":null,"abstract":"This paper is on the ATC-32 (Applied Technology Council) project. A California Department of Transportation (Caltrans) sponsored project to review and revise existing standards, performance criteria, specifications, and practices for the seismic design and construction of new bridge structures within California. Subject areas addressed by this project include: (a) performance criteria; (b) seismic loading; (c) seismic effects (i.e. dynamic analysis); (d) foundation design; (e) concrete design; and (f) steel design.","PeriodicalId":163993,"journal":{"name":"SP-160: Seismic Rehabilitation of Concrete Structures","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":"131311557","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":"Seismic Rehabilitation of Concrete Bridge Substructures","authors":"B. L. Meyers, S. H. Tso, K. Wiedner, K. T. Lam","doi":"10.14359/1554","DOIUrl":"https://doi.org/10.14359/1554","url":null,"abstract":"This paper describes the seismic rehabilitation methods for the reinforced concrete substructures of two structural steel bridges in California. The rehabilitation is part of the seismic retrofit program implemented by the California Department of Transportation (CALTRANS). The analysis and design basically followed the general seismic retrofit principles and guidelines developed by CALTRANS and other research institutes in recent years. However, due to the site conditions and retrofit limitations of these two bridges, innovative methods were employed in order to minimize the retrofit costs.","PeriodicalId":163993,"journal":{"name":"SP-160: Seismic Rehabilitation of Concrete Structures","volume":"160 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":"123578533","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":"Evaluation and Upgrading of Outrigger Knee Joints","authors":"C. Thewalt, B. Stojadinović","doi":"10.14359/1555","DOIUrl":"https://doi.org/10.14359/1555","url":null,"abstract":"The catastrophic collapse of the old Cypress Viaduct during the Loma Prieta 1989 earthquake emphasized the vulnerability of elevated freeway bridge structures. One track of the joint Caltrans and University of California, Berkeley research project is the investigation of outrigger knee joints found in elevated freeway bents. This project has two principal goals: (1) to evaluate the behavior of the existing outrigger knee joint subassemblies under a combined transverse and longitudinal loading and (2) to devise and experimentally verify upgrading strategies and repair techniques suitable for application on the existing elevated freeways. In parallel with the experiments, a set of tools was developed for design and analysis of the upgraded subassemblies. A summary of the design, analytical, and experimental work conducted to date is presented in this paper.","PeriodicalId":163993,"journal":{"name":"SP-160: Seismic Rehabilitation of Concrete Structures","volume":"20 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":"128553520","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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