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杜毛毛

（華僑大學(xué)土木工程學(xué)院，廈門 361021）

 

[摘要] 基于收集整理的902個(gè)鋼筋混凝土梁和287個(gè)預(yù)應(yīng)力混凝土梁的跨中撓度試驗(yàn)數(shù)據(jù)樣本，從計(jì)算方法、表達(dá)形式和計(jì)算精度等方面，對(duì)中美歐混凝土規(guī)范的短期剛度計(jì)算模式進(jìn)行了比較。結(jié)果表明，與開裂彎矩有關(guān)的剛度公式可用一個(gè)統(tǒng)一公式來表示，當(dāng)計(jì)算彎矩與開裂彎矩相差不大時(shí)，各公式計(jì)算值對(duì)開裂彎矩的變化非常敏感。對(duì)鋼筋混凝土梁，中國(guó)規(guī)范GB 50010-2010精度最好，中國(guó)規(guī)范SL 191-2008其次，中國(guó)規(guī)范JTG D62-2004最低。對(duì)預(yù)應(yīng)力混凝土梁，中國(guó)規(guī)范SL 191-2008精度最高，美國(guó)規(guī)范ACI 318-08最低，中國(guó)規(guī)范GB 50010-2010剛度公式對(duì)后張有粘結(jié)預(yù)應(yīng)力混凝土梁的適用性不甚理想。

[關(guān)鍵詞] 受彎構(gòu)件；短期剛度；規(guī)范比較；計(jì)算精度

中圖分類號(hào)：TU375-1文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2012)10-0098-04

 

Du Maomao

(College of Civil Engineering, Huaqiao University, Xiamen 361021, China)

 

Abstract: Based on mid-span deflections of 902 reinforced concrete beams and 287 prestressed concrete beams, the calculation models of short-term stiffness of Chinese, American and European concrete codes were compared from calculation method, expression form and calculation accuracy. Results show that the stiffness formulae using cracking moment can be unified to one formula; the calculated values of formulae are very sensitive to the change of cracking moment when calculating moment is approach to cracking moment. For reinforced concrete beams, the accuracy of Chinese code GB 50010-2010 is highest, then Chinese code SL 191-2008 is lower, Chinese code JTG D62-2004 is the lowest. For prestressed concrete beams, Chinese code SL 191-2008 has the highest accuracy, while American code ACI 318-08 has the lowest one, the accuracy of the stiffness formula in Chinese code GB 50010-2010 is not good to post-tensioned bonded prestressed concrete beams.

Keywords: flexural member; short term stiffness; code comparison; calculation accuracy

*中央高?；究蒲袠I(yè)務(wù)費(fèi)資助項(xiàng)目（JB-ZR1230），福建省自然科學(xué)基金計(jì)劃項(xiàng)目（2012J01222），華僑大學(xué)高層次人才科研啟動(dòng)費(fèi)項(xiàng)目（11BS106）。

作者簡(jiǎn)介：杜毛毛，博士，講師，Email：dumm@hqu.edu.cn。

 

［1］GB 50010—2010混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范［S］. 北京: 中國(guó)建筑工業(yè)出版社, 2011.

［2］沈在康. 混凝土結(jié)構(gòu)設(shè)計(jì)新規(guī)范應(yīng)用講評(píng)［M］. 北京: 中國(guó)建筑工業(yè)出版社, 1993.

［3］SL 191—2008水工混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范［S］. 北京: 中國(guó)水利水電出版社, 2009.

［4］JTG D62—2004公路鋼筋混凝土及預(yù)應(yīng)力混凝土橋涵設(shè)計(jì)規(guī)范［S］. 北京: 人民交通出版社, 2004.

［5］ACI 318—08 Building code requirements for structural concrete and commentary ［S］. ACI Committee Institute, 2008.

［6］EN 1992-1-1: 2004 Eurocode 2: design of concrete structures-part 1-1: general rules and rules for buildings ［S］. European Committee for Standardization, 2004.

［7］杜毛毛. 配500MPa鋼筋后張有粘結(jié)預(yù)應(yīng)力混凝土梁受彎性能研究［D］. 上海: 同濟(jì)大學(xué), 2010.