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SP-225: Serviceability of Concrete: A Symposium Honoring Dr. Edward G. Nawy最新文献

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Prescriptive or Performance Design for Fire? 规范设计还是性能设计?
SP-225: Serviceability of Concrete: A Symposium Honoring Dr. Edward G. Nawy Pub Date : 2005-03-01 DOI: 10.14359/14374
P. Sullivan
{"title":"Prescriptive or Performance Design for Fire?","authors":"P. Sullivan","doi":"10.14359/14374","DOIUrl":"https://doi.org/10.14359/14374","url":null,"abstract":"Prescriptive fire design is based on protective cover derived from simply supported members conditioned to a standard moisture content and loaded with design loads in a furnace heated under a standard rate. Where building have indeterminate members in the structure the prescriptive design would be uneconomical and in certain cases may be unsafe and performance design described in this paper should be undertaken. Three approaches to fire design that are currently available are: The direct application of data from full size furnace tests using the standards ISO 834 Time Temperature curve , the values of which are tabulated in Building Codes; conventional ultimate limit state design in bending for fire, taking into account idealized material losses in strength; and a complete analysis of structural members using iterative solutions of finite differences or finite elements to estimate temperature gradients and finite elements to estimate temperature gradients and finite elements to determine the resulting stress and strain resultants.","PeriodicalId":341120,"journal":{"name":"SP-225: Serviceability of Concrete: A Symposium Honoring Dr. Edward G. Nawy","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131936822","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}
引用次数: 0
Epoxy Coated Reinforcement and Crack Control 环氧涂层加固与裂缝控制
SP-225: Serviceability of Concrete: A Symposium Honoring Dr. Edward G. Nawy Pub Date : 2005-03-01 DOI: 10.14359/14383
D. T. Blackman, R. Frosch
{"title":"Epoxy Coated Reinforcement and Crack Control","authors":"D. T. Blackman, R. Frosch","doi":"10.14359/14383","DOIUrl":"https://doi.org/10.14359/14383","url":null,"abstract":"The objective of this research was to evaluate the influence of epoxy coating on crack spacing and crack widths. Ten slabs reinforced with both black and epoxy coated reinforcements were tested. Of particular interest was the effect of the thickness of the epoxy coating and the spacing of the reinforcement. The variables included the epoxy coating thickness, reinforcement spacing, and reinforcement stress. The results clearly demonstrate that epoxy coating increases cboth rack widthsand spacing.","PeriodicalId":341120,"journal":{"name":"SP-225: Serviceability of Concrete: A Symposium Honoring Dr. Edward G. Nawy","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129426423","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}
引用次数: 2
Crack Width Prediction for Ledges in Inverted ‘T’ Bent Caps 倒“T”型弯帽岩架裂缝宽度预测
SP-225: Serviceability of Concrete: A Symposium Honoring Dr. Edward G. Nawy Pub Date : 2005-03-01 DOI: 10.14359/14384
R. H. Zhu, T. Hsu
{"title":"Crack Width Prediction for Ledges in Inverted ‘T’ Bent Caps","authors":"R. H. Zhu, T. Hsu","doi":"10.14359/14384","DOIUrl":"https://doi.org/10.14359/14384","url":null,"abstract":"Inverted \"T\" bent caps are used frequently on Texas bridges because they are aesthetically pleasing and offer a practical means to increase vertical clearance. Since the current design guidelines do not address the existing problem of crack control at service load adequately, explicit design provisions for cracking need to be developed. This research seeks to develop a serviceablity design method for controlling crack widths at the re-entrant corners of inverted \"T\" bent caps. The design method is based on a rational physical model and is collaborated by an extensive experimental program. The three types of specimens tested were: the 2-D specimens, 3-D specimens and whole-bent-cap specimens. Three equations are proposed to control the diagonal crack widths at the re-entrant corners of the inverted \"T\" bent caps. The equations are: one for crack widths at the vicinity of interior applied loads, and the other two for crack widths at the end faces of exterior spans; the equations are applicable to full size highway bridges and are suitable for incorporatiion into the AASHTO Specifications.","PeriodicalId":341120,"journal":{"name":"SP-225: Serviceability of Concrete: A Symposium Honoring Dr. Edward G. Nawy","volume":"255 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133359769","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}
引用次数: 5
Bacterial Concrete-A Concrete for the Future 细菌混凝土——未来的混凝土
SP-225: Serviceability of Concrete: A Symposium Honoring Dr. Edward G. Nawy Pub Date : 2005-03-01 DOI: 10.14359/14376
V. Ramakrishnan, R. Panchalan, S. Bang
{"title":"Bacterial Concrete-A Concrete for the Future","authors":"V. Ramakrishnan, R. Panchalan, S. Bang","doi":"10.14359/14376","DOIUrl":"https://doi.org/10.14359/14376","url":null,"abstract":"This paper describes the microbial remediation of cracks in cement mortar specimens that substantially increased the compressive strength, stiffness and modulus of rupture. Additionally, the durability characteristics of the specimens improved also. Test results have clearly demonstrated that microbiologically induced calcite precipitation is effective in remediation of cracks. Scanning electron microscope (SEM) examination was found to be an effective method for characterizing the process of microbial mineral precipitation in cement mortar. The unique imaging and microanalysis capabilities of SEM identified the presence of calcite precipitation inside cracks, bacterial impressions and a new calcite layer on the surface of cement mortar. The calcite layer improves the impermeability of the specimen, thus increasing its resistance to alkaline, sulfate and freeze-thaw attack.","PeriodicalId":341120,"journal":{"name":"SP-225: Serviceability of Concrete: A Symposium Honoring Dr. Edward G. Nawy","volume":"302 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133803946","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}
引用次数: 9
Retrofitting and Repairing of Heavily Cracked Unbonded Post-Tensioned Structural Systems with Composite Materials 复合材料对严重开裂无粘结后张结构体系的改造与修复
SP-225: Serviceability of Concrete: A Symposium Honoring Dr. Edward G. Nawy Pub Date : 1900-01-01 DOI: 10.14359/14382
P. Chakrabarti
{"title":"Retrofitting and Repairing of Heavily Cracked Unbonded Post-Tensioned Structural Systems with Composite Materials","authors":"P. Chakrabarti","doi":"10.14359/14382","DOIUrl":"https://doi.org/10.14359/14382","url":null,"abstract":"The purpose of this project was to use fiber reinforced polymers (FRPs) and high strength adhesives for the repair and retrofit of unbonded prestressed beams. The goal was to study the interaction of the two materials and the basis structural behavior of the repaired or retrofitted beams. The results from the experiment, such as: crack propagations, deflections, load increments, steel strains, and prestressing loads were recorded using auto-data recording system. The general behavior and the strength of each one of the control beams and the corresponding repaired or retrofitted beam was studied","PeriodicalId":341120,"journal":{"name":"SP-225: Serviceability of Concrete: A Symposium Honoring Dr. Edward G. Nawy","volume":"33 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":"131887310","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}
引用次数: 0
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