現(xiàn)澆空心樓板中無(wú)粘結(jié)預(yù)應(yīng)力鋼絞線應(yīng)力增量研究
劉昭清1,錢稼茹2,徐焱2
- 摘 要
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劉昭清1,錢稼茹2,徐焱2(1 西南交通大學(xué)土木工程系, 成都 610031; 2 清華大學(xué)結(jié)構(gòu)工程與振動(dòng)教育部重點(diǎn)實(shí)驗(yàn)室, 北京 100084)[摘要]為研究現(xiàn)澆空心樓板中無(wú)粘結(jié)預(yù)應(yīng)力鋼絞線的應(yīng)力增量,對(duì)一塊四邊簡(jiǎn)支、凈跨為8m×8m的現(xiàn)澆預(yù)應(yīng)力混凝土空心樓板進(jìn)行了抗彎試驗(yàn)和有限元分析,采用國(guó)內(nèi)外規(guī)范公式計(jì)算了該試驗(yàn)板預(yù)應(yīng)力鋼絞線的極限應(yīng)力增量。結(jié)果表明,有限元計(jì)算得到的荷載\|預(yù)應(yīng)力鋼絞線應(yīng)力增量關(guān)系與試驗(yàn)實(shí)測(cè)結(jié)果符合較好;規(guī)范JGJ 92—2004公式計(jì)算得到的預(yù)應(yīng)力鋼絞線極限應(yīng)力增量不到試驗(yàn)實(shí)測(cè)值和有限元計(jì)算值的一半。建議空心樓板無(wú)粘結(jié)預(yù)應(yīng)力鋼絞線的極限應(yīng)力增量可取JGJ 92—2004規(guī)定值的2倍。[關(guān)鍵詞]現(xiàn)澆預(yù)應(yīng)力混凝土; 空心樓板; 無(wú)粘結(jié)預(yù)應(yīng)力鋼絞線; 應(yīng)力增量; 試驗(yàn)研究中圖分類號(hào):TU378文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1002848X(2013)06008204Investigation on stress increments of unbounded prestressed strands of castinsituconcrete hollow floor slabsLiu Zhaoqing1, Qian Jiaru2, Xu Yan2(1 College of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China;2 Key Laboratory forStructure Engineering and Vibration of Education Ministry, Tsinghua University, Beijing 100084, China)Abstract:To study the stress increments of the unbounded prestressed strands, bending test and finite element analysis of a 8m×8m castinsitu prestressed concrete hollow slab with four edges supported simply were carried out. The ultimate stress increment of the unbounded strands of the test slab was calculated by design codes. The results show that the loadstress increment relationship of strands calculated by the finite element analysis agrees well with the test curve. The ultimate stress increment obtained by JGJ 92—2004 is less than half of the test value. It is recommended that the ultimate stress increment of unbounded prestress strands can be two times of the value specified by JGJ 92—2004.Keywords:castinsitu prestressed concrete; hollow slab; unbounded prestressed strand; stress increment; experiment study作者簡(jiǎn)介:劉昭清,博士,工程師,Email:hands1224@163.com。參考文獻(xiàn)[1]NAAMAN A E, ALKHAIRI F M. Stress at ultimate in unbounded posttensioning tendons:Part 2Porposed methodology [J]. ACI Structural Journal,1991, 88(6):683692.[2]杜拱辰,陶學(xué)康. 部分預(yù)應(yīng)力混凝土梁無(wú)粘結(jié)筋極限應(yīng)力的研究[J].建筑結(jié)構(gòu)學(xué)報(bào),1985, 6(6):213.[3]宋永發(fā),王清湘,宋玉普,等.無(wú)粘結(jié)預(yù)應(yīng)力雙向板變形計(jì)算方法研究[J].大連理工大學(xué)學(xué)報(bào),2001,41(5): 617620.[4]PARK R, GAMBE W L. 鋼筋混凝土板[M]. 黃國(guó)禎,成源華,譯.上海:同濟(jì)大學(xué)出版社,1992.[5]房貞政. 無(wú)粘結(jié)與部分預(yù)應(yīng)力結(jié)構(gòu)[M]. 北京:人民交通出版社,1999.[6]JGJ 92—2004無(wú)粘結(jié)預(yù)應(yīng)力混凝土結(jié)構(gòu)技術(shù)規(guī)程[S]. 北京:中國(guó)建筑工業(yè)出版社,2004.[7]MSC. Software Corporation. Marc Volume A:Theory and user information [M]. 2005ed.U.S.A MSC. Software Corporation,2005.[8]鄭文中,王曉東,王英. 現(xiàn)澆預(yù)應(yīng)力混凝土梁板中無(wú)粘結(jié)筋應(yīng)力增量極限值計(jì)算方法研究[C]//第十四屆全國(guó)混凝土及預(yù)應(yīng)力混凝土學(xué)術(shù)會(huì)議論文,2007:362383.[9]JGJ/T 92—93無(wú)粘結(jié)預(yù)應(yīng)力混凝土結(jié)構(gòu)技術(shù)規(guī)程[S]. 北京:中國(guó)建筑工業(yè)出版社,1993.[10]American Concrete Institute. Building Code Requirements for Structural Concrete (ACI 31802) and Commentary (ACI 31802)[S]. Michigan: ACI Committee 318,2002.[11] DIN 42272—1984. Prestressed concrete: partially prestressed structural members[S]. Deutsches Institut für Normung E.V., 1984.[12]BS 8110—1985 Code of practice for the structural use of concrete:Part 1:design, materials and workmanship[S]. British Standards Institute,1985.
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