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SP-203: Code Provisions for Deflection Control in Concrete Structures最新文献

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Deflection Calculation and Control -Australian Code Amendments and Improvements 挠度计算和控制-澳大利亚规范修订和改进
SP-203: Code Provisions for Deflection Control in Concrete Structures Pub Date : 2001-08-01 DOI: 10.14359/10804
R. Gilbert
{"title":"Deflection Calculation and Control -Australian Code Amendments and Improvements","authors":"R. Gilbert","doi":"10.14359/10804","DOIUrl":"https://doi.org/10.14359/10804","url":null,"abstract":"This paper describes the behavior of reinforced and prestressed concrete flexural members under sustained service loads and outlines recent developments in the design of concrete structures for the serviceability limit states, particularly with regard to deflection and crack control. The effects of concrete cracking, creep and shrinkage on cross-sectional stresses and deformation are demonstrated and discussed for a wide range of actions and reinforcement layouts. Recent amendments to the serviceability provisions of the Australian Standard for Concrete Structures AS3600 are presented and the background to, and reasons for, the proposed changes are explained. The paper also highlights the inadequacies of the existing deflection calculation procedure in ACI 318M-99 and suggests ways to improve it. A method is proposed for calculating the time-dependent deflection of reinforced and prestressed concrete members taking into account the time-dependent effects of creep and shrinkage, including the loss of stiffness caused by shrinkage induced cracking and the breakdown of tension stiffening with time. The method is illustrated by several examples.","PeriodicalId":144346,"journal":{"name":"SP-203: Code Provisions for Deflection Control in Concrete Structures","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122018278","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: 15
Serviceability Provisions in the New Eurocode for the Design of Concrete Structures 新欧洲混凝土结构设计规范中的适用性条款
SP-203: Code Provisions for Deflection Control in Concrete Structures Pub Date : 2001-08-01 DOI: 10.14359/10802
A. Beeby
{"title":"Serviceability Provisions in the New Eurocode for the Design of Concrete Structures","authors":"A. Beeby","doi":"10.14359/10802","DOIUrl":"https://doi.org/10.14359/10802","url":null,"abstract":"This paper provides an outline of the provisions for design for serviceability given in the current version of Eurocode 2, the Eurocode for the design of concrete structures. The provisions for stress limitation and crack control are outlined briefly together with some of the reasoning behind them. A more detailed description of the background and content of the clauses dealing with the control of deflection are given.","PeriodicalId":144346,"journal":{"name":"SP-203: Code Provisions for Deflection Control in Concrete Structures","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128225753","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: 1
Span/Thickness limitations for Deflection Control 挠度控制的跨度/厚度限制
SP-203: Code Provisions for Deflection Control in Concrete Structures Pub Date : 2001-08-01 DOI: 10.14359/10806
N. J. Gardner
{"title":"Span/Thickness limitations for Deflection Control","authors":"N. J. Gardner","doi":"10.14359/10806","DOIUrl":"https://doi.org/10.14359/10806","url":null,"abstract":"Predicting the deflection serviceability of reinforced concrete members in service is fraught with uncertainties, which include imperfect knowledge of the limiting serviceability criteria, the material properties and the load history including construction loads and the service load. The serviceability criteria can be immediate deflection/curvature or incremental deflection/curvature. Most codes offer two methods for control of deflections. The designer may choose to calculate the deflections and check that these computed deflections are less than arbitrary, specified allowable limits. Calculating the immediate deflections of reinforced concrete members is difficult due to the concrete cracking in the tension zones of such members. Calculating the additional deflections due to the shrinkage and creep of the concrete and the consequent redistribution of stress is extremely difficult. Alternatively the codes give specified maximum span/depth ratios for which serviceability can be assumed to be satisfied and deflections do not need to be calculated. This paper compares the deemed-to-comply span/thickness limits of ACI 318-99, CSA A23.3-94, BS 8110-85, AS 3600-94 Eurocode 2 (1992 draft), ACI 435-78 and the proposals of Gardner and Zhang (1995), Thompson and Scanlon (1988), Asamoah and Gardner (1997) and Scanlon and Choi (1999).","PeriodicalId":144346,"journal":{"name":"SP-203: Code Provisions for Deflection Control in Concrete Structures","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132723804","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: 3
Bending Stiffness of Concrete Flexural Members Reinforced with High Strength Steel 高强钢配筋混凝土受弯构件的抗弯刚度
SP-203: Code Provisions for Deflection Control in Concrete Structures Pub Date : 2001-08-01 DOI: 10.14359/10809
B. Rangan, P. Sarker
{"title":"Bending Stiffness of Concrete Flexural Members Reinforced with High Strength Steel","authors":"B. Rangan, P. Sarker","doi":"10.14359/10809","DOIUrl":"https://doi.org/10.14359/10809","url":null,"abstract":"Reinforcing bars with a minimum yield strength of 500 MPa (72.5 ksi) are currently in use in Australia. The paper examines the effect of this high strength reinforcement on the bending stiffness of flexural members. The influence of tensile steel ratio, concrete strength and shrinkage of concrete on the bending stiffness is studied using a parametric analysis. It is found that for the same service load the bending stiffness of members with 500 MPa (72.5 ksi) reinforcement varies between 85 and 100% of that of members reinforced with 400 MPa (60 ksi) steel depending on tensile steel ratio. Also shrinkage of concrete should be included in the bending stiffness calculations for members with tensile steel ratio less than about 0.008.","PeriodicalId":144346,"journal":{"name":"SP-203: Code Provisions for Deflection Control in Concrete Structures","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127946629","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
Deflection Provisions in the Draft Brazilian Code 巴西法规草案中的偏转条款
SP-203: Code Provisions for Deflection Control in Concrete Structures Pub Date : 2001-08-01 DOI: 10.14359/10805
M. Guarda, J. Lima, L. Pinheiro
{"title":"Deflection Provisions in the Draft Brazilian Code","authors":"M. Guarda, J. Lima, L. Pinheiro","doi":"10.14359/10805","DOIUrl":"https://doi.org/10.14359/10805","url":null,"abstract":"This paper presents an overview of the requirements for deflection of beams and slabs in the draft Brazilian Code for concrete structures, NBR 6118:2000. Firstly, the Brazilian Code recommendations for deflection computations and allowable limits are described, and then these provisions are compared with those of section 9.5 of the American Concrete Institute (ACI) 318-99. The paper also includes a numerical example to illustrate how the new proposals are applied to structural design. It is observed that the general criteria of the two codes are similar, but some differences are pointed out regarding minimum thickness requirements, load conditions, effective moment of inertia for continuous beams and the values of modular ratio, modulus of rupture and allowable deflections.","PeriodicalId":144346,"journal":{"name":"SP-203: Code Provisions for Deflection Control in Concrete Structures","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125527109","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
Deflection Prediction for Reinforced Concrete Structures Under Service load 钢筋混凝土结构在使用荷载作用下的挠度预测
SP-203: Code Provisions for Deflection Control in Concrete Structures Pub Date : 2001-08-01 DOI: 10.14359/10808
N. Mickleborough
{"title":"Deflection Prediction for Reinforced Concrete Structures Under Service load","authors":"N. Mickleborough","doi":"10.14359/10808","DOIUrl":"https://doi.org/10.14359/10808","url":null,"abstract":"","PeriodicalId":144346,"journal":{"name":"SP-203: Code Provisions for Deflection Control in Concrete Structures","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121262008","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
ACI Code Requirements for Deflection Control: A Critical Review ACI规范对偏转控制的要求:一个重要的回顾
SP-203: Code Provisions for Deflection Control in Concrete Structures Pub Date : 2001-08-01 DOI: 10.14359/10801
A. Scanlon, Drc Orsak, D. Buettner
{"title":"ACI Code Requirements for Deflection Control: A Critical Review","authors":"A. Scanlon, Drc Orsak, D. Buettner","doi":"10.14359/10801","DOIUrl":"https://doi.org/10.14359/10801","url":null,"abstract":"American Concrete Institute (ACI) Building Code requirements for deflection control are critically reviewed. Provisions for minimum thickness, deflection computations, and permissible computed deflections are reviewed. Differences in the approaches to deflection control for one-way and two-way construction are identified. Limitations in the application of the prescribed deflection calculation method are discussed. Results of a survey of consulting firms concerning deflection control in design offices are presented. The paper concludes by suggesting possible directions for future changes in building code requirements for deflection control.","PeriodicalId":144346,"journal":{"name":"SP-203: Code Provisions for Deflection Control in Concrete Structures","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126506815","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: 12
Time-Dependent Deflection and Cracking of Reinforced Concrete Flat Slabs 钢筋混凝土平板的时变挠曲与开裂
SP-203: Code Provisions for Deflection Control in Concrete Structures Pub Date : 1900-01-01 DOI: 10.14359/10810
R. Gilbert
{"title":"Time-Dependent Deflection and Cracking of Reinforced Concrete Flat Slabs","authors":"R. Gilbert","doi":"10.14359/10810","DOIUrl":"https://doi.org/10.14359/10810","url":null,"abstract":"An experimental program of long-term testing of large-scale reinforced concrete flat slab structures is described and the results from the first series of tests on five continuous flat slab specimens are presented. Each specimen was subjected to sustained service loads for periods up to 500 days and the deflection, extent of cracking and column loads were monitored throughout. The measured long-term deflection is many times the initial short-term deflection, due primarily to the loss of stiffness associated with time-dependent cracking under the combined influences of transverse load and drying shrinkage. This effect is not accounted for in the current code approaches for deflection calculation and control. Recently proposed procedures to improve deflection calculation are evaluated against the test results and good agreement between the measured and calculated deflections is obtained.","PeriodicalId":144346,"journal":{"name":"SP-203: Code Provisions for Deflection Control in Concrete Structures","volume":"17 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":"128219859","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
UK Code Requirements for Deflection Control 英国偏转控制规范要求
SP-203: Code Provisions for Deflection Control in Concrete Structures Pub Date : 1900-01-01 DOI: 10.14359/10803
R. Scott
{"title":"UK Code Requirements for Deflection Control","authors":"R. Scott","doi":"10.14359/10803","DOIUrl":"https://doi.org/10.14359/10803","url":null,"abstract":"A brief history is given of United Kingdom (UK) requirements for deflection control since 1948. Current requirements of BS8110 are then presented followed by a summary of developments concerning high strength concrete. Finally, future developments involving Eurocode 2 are indicated.","PeriodicalId":144346,"journal":{"name":"SP-203: Code Provisions for Deflection Control in Concrete Structures","volume":"717 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":"120846940","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
Effect of Flange Width on Beam Deflections 法兰宽度对梁挠度的影响
SP-203: Code Provisions for Deflection Control in Concrete Structures Pub Date : 1900-01-01 DOI: 10.14359/10807
H. Nassif, M. Sanders, W. Cao
{"title":"Effect of Flange Width on Beam Deflections","authors":"H. Nassif, M. Sanders, W. Cao","doi":"10.14359/10807","DOIUrl":"https://doi.org/10.14359/10807","url":null,"abstract":"Current concrete design codes use an effective stiffness model to calculate the deflections of T-Beams. Based on the effective flange width, an effective moment of inertia, as well as section properties is computed. This effective flange width is limited by a criterion that is not consistent between various codes and which directly affects the computed deflections, moments, shears, and torques for the beam. In particular, the effect of flange width on serviceability limit states such as deflection, fatigue, cracking, and vibration is evident. There is a need to use more rational as well as realistic effective flange width criteria that would lead to more accurate predictions of beam deflections. An analytical and experimental study has been initiated to assess the contribution of the flange width to the calculation of deflection in concrete T-beams. This paper presents part of the results of an analytical study to model the exact behavior of T-beams with various effective flange widths. The Finite Element Method (FEM) is utilized to model the overall pre-cracking, cracking, and post-cracking, non-linear behavior. Actual data for material properties are used to model concrete and reinforcing steel. The FE Model is validated using available test results from literature and then used to analyze T-beams with various parameters. The beams are incrementally loaded to failure under a two point loading system. The load-deflection relationships are determined. A parametric study is undertaken to determine the effect of overall flange width, and other parameters such as reinforcement ratio, and concrete compressive strength, on deflections. Results show that deflections for beams subjected to service loads (service load ranging between cracking and 30-40% of ultimate loads) are mainly affected by using the effective flange width rather than full flange width. It is observed that using the actual flange width would provide a better estimate of deflection at service loads.","PeriodicalId":144346,"journal":{"name":"SP-203: Code Provisions for Deflection Control in Concrete Structures","volume":"17 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":"131730716","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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