國內(nèi)外混凝土構(gòu)件裂縫控制安全度設(shè)置水平的比較
李揚，侯建國
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(武漢大學(xué)土木建筑工程學(xué)院，武漢430072)［摘要］根據(jù)已收集到的國內(nèi)外混凝土結(jié)構(gòu)設(shè)計規(guī)范關(guān)于裂縫寬度計算公式的有關(guān)規(guī)定，對裂縫寬度計算公式的保證率及其荷載效應(yīng)組合等進行了比較，并初步研究了《混凝土結(jié)構(gòu)設(shè)計規(guī)范》(GB50010—2002)裂縫寬度計算公式的安全度設(shè)置水平。提出了以等效保證率作為衡量頻遇組合或準(zhǔn)永久組合下裂縫寬度計算公式的安全度評判指標(biāo)的建議。在此基礎(chǔ)上，對我國規(guī)范GB50010—2002的裂縫寬度計算公式提出了兩點修訂建議：將裂縫寬度公式的計算保證率由95%降為82%，相應(yīng)的受彎構(gòu)件受力特征系數(shù)由2.1降為1.7；除吊車荷載外，其他構(gòu)件可考慮采用頻遇組合代替標(biāo)準(zhǔn)組合進行裂縫寬度計算。［關(guān)鍵詞］混凝土構(gòu)件；裂縫寬度；等效保證率；頻遇組合；準(zhǔn)永久組合中圖分類號：TU375.02文獻標(biāo)識碼：A文章編號：1002-848X(2011)02-0124-04Comparison of safety level of Chinese and foreign crack control of concrete membersLi Yang, Hou Jianguo(School of Civil Engineering, Wuhan University, Wuhan 430072, China)Abstract:According to the crack-width formula in Chinese and foreign concrete structure design codes, the calculation guarantee rate of flexural crack-width formula, load combination etc., were compared, and the safety level of flexural crack-width formula in GB50010—2002 was preliminarily studied. A new concept named equivalent guarantee rate was created as an index to evaluate the safety level of flexural crack-width calculation under frequent combination and quasi-permanent combination. Two revised suggestions about flexural crack-width formula in GB50010—2002 were presented: the calculation guarantee rate of flexural crack-width formula should be lowered from 95% to 82%, correspondingly the value of characteristic coefficient in flexural crack-width formula should be lowered from 2.1 to 1.7; except crane beams, the flexural crack-width should be calculated under frequent combination in place of characteristic combination.Keywords:concrete member; crack-width; equivalent guarantee rate; frequent combination; quasi-permanent combination中央高?；究蒲袠I(yè)務(wù)費專項資金資助(092)。作者簡介：李揚，博士研究生，Email：liyang04201@126.com。參考文獻［1］貢金鑫, 魏巍巍，胡家順.中美歐混凝土結(jié)構(gòu)設(shè)計［M］.北京：中國建筑工業(yè)出版社，2007.［2］GB50010—2002混凝土結(jié)構(gòu)設(shè)計規(guī)范［S］.北京：中國建筑工業(yè)出版社，2002.［3］ EN1992-1-1:2004 Design of concrete structures, Part 1: General rules and rules for building［S］. European Committee for Standardization, 2004.［4］Building code requirements for structural concrete (ACI318-95) and commentary (ACI318R-95)［S］. ACI Committee Institute, Farmington Hills, Mich.，2008.［5］Building and civil engineering structures: Structure use of concrete Part 1: Code of practice for design and construction (BS8110: Part1: 1997)［S］. British Standards Institution, London, British, 1997.［6］白生翔. 預(yù)應(yīng)力混凝土構(gòu)件計算方法的若干改進建議［C］//第十三屆全國混凝土及預(yù)應(yīng)力混凝土學(xué)術(shù)交流會論文集. 北京, 2005: 243-249.［7］ACI Committee 318 Closure to public comment on ACI318-99［J］. Concrete International, 1999: (318-1)-(318-50).［8］FROSCH R J. Another look at cracking and crack control in reinforced concrete［J］. ACI Structure Journal, 1999，96(3):437-442.［9］GERGELY P，LUTZ L A. Maximum crack width in reinforced concrete flexural members［C］//Causes, Mechanisms, and Control of Cracking in Concrete. American Concrete Institute,Farmington Hills,Mich., 1968：87-117.［10］BEEBY A W. The prediction of crack widths in hardened concrete［J］. The Structural Engineer,1979，57A(1):9-17.［11］李剛，侯建國.中美混凝土結(jié)構(gòu)設(shè)計規(guī)范可靠度設(shè)置水平的比較［J］.四川建筑科學(xué)研究，2003(2)：11-13.［12］沈在康. 混凝土結(jié)構(gòu)設(shè)計新規(guī)范應(yīng)用講評［M］. 北京: 中國建筑工業(yè)出版社, 1993.［13］余安東, 葉潤修. 建筑結(jié)構(gòu)的安全性與可靠性［M］.上海: 上?？茖W(xué)技術(shù)文獻出版社, 1986.［14］徐克利. 混凝土構(gòu)件的荷載裂縫控制問題探討［C］//中國預(yù)應(yīng)力技術(shù)五十年暨第九屆后張預(yù)應(yīng)力學(xué)術(shù)交流會論文集. 北京, 2006:221-226.［15］GB50153—2008 工程結(jié)構(gòu)可靠性設(shè)計統(tǒng)一標(biāo)準(zhǔn)［S］.北京：中國建筑工業(yè)出版社, 2008.［16］GB50009—2001建筑結(jié)構(gòu)荷載規(guī)范［S］. 北京：中國建筑工業(yè)出版社，2006.
