基于雅申理论的混凝土模板侧压力计算模型及实验研究
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摘要
为提高模板侧压力计算的准确性和可靠性,进行了新浇混凝土侧压力实验,并将实测数据与不同规范计算值进行了对比分析。基于雅申理论建立了新浇混凝土侧压力计算模型,推导了新浇混凝土模板侧压力计算公式,并通过实测值进行了验证。研究表明:采用现行规范计算新浇混凝土侧压力不仅离散性较大,而且存在一定的安全隐患;而基于雅申理论建立的模板侧压力模型不仅能较准确地预测新浇混凝土侧压力,而且计算值与实测值相比离散性小,可靠性高。
To improve the accuracy and reliability of the calculation of concrete-formwork lateral pressure, a series of pressure test were carried out. The test data and the calculated value of different specifications were analyzed in the way of comparison. Then, a calculation model for concrete formwork lateral pressure was established based on Janssen theory and a calculation formula was derived. The reliability of the formula was proved by the experimental data. Research showed that there exist some potential safety problems as well as large dispersion in formwork lateral pressure calculated by the current codes. The model proposed can more accurately predict the lateral pressure with high reliability and lower dispersion when compared with the test value.
To improve the accuracy and reliability of the calculation of concrete-formwork lateral pressure, a series of pressure test were carried out. The test data and the calculated value of different specifications were analyzed in the way of comparison. Then, a calculation model for concrete formwork lateral pressure was established based on Janssen theory and a calculation formula was derived. The reliability of the formula was proved by the experimental data. Research showed that there exist some potential safety problems as well as large dispersion in formwork lateral pressure calculated by the current codes. The model proposed can more accurately predict the lateral pressure with high reliability and lower dispersion when compared with the test value.
引文
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[11]JTJ041―89,公路桥涵施工技术规范[S].北京:人民交通出版社,1990.JTJ041―89,Technical specification for construction of highway bridges and culverts[S].Beijing:China Communications Press,1990.(in Chinese)
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[13]谢楠.混凝土浇筑期高大模板支架工作状态的试验测试[J].工程力学,2011,28(1):85―89.Xie Nan.In-situ test of working state of high falsework during concrete placement[J].Engineering Mechanics,2011,28(1):85―89.(in Chinese)
[14]王德利.“贮仓法”计算混凝土侧压力[J].水利水运,1990(7):15―17.Wang Deli.Calculation of lateral pressure of fresh concrete by“feed bin”method[J].Port&Waterway Engineering,1990(7):15―17.(in Chinese)
[15]Zhang Wenxue,Huang Jian,Li Yunkai and Xie Quanyi,Study of formwork pressure of column under ultra-deep vibration[J].Magzine of Concrete Research,2016,68(22):1155―1165.
[16]Vanhove Y,Djelal C and Magnin A,Prediction of the lateral pressure exerted by self-compacting concrete on formwork[J].Magazine of Concrete Research,2004,56(1):55―62.
[17]ACI Committee 347,Guide to formwork for concrete[S].Farmington Hills,MI,USA:ACI Standard,2004.
[18]CIRIA Report 108.Concrete pressure on formwork[S].London,UK:Construction Industry Research and Information Association,1985.
[19]Janssen H A.Versucheüber Getreidedruck in Silozellen.Zeitschr.d.Vereines deutscher Ingenieure[J].1895,39(35):1045―1049.
[20]Zhang Wenxue,Chen Ying,Li Yunkai,et al.Study of formwork pressure of wall under ultra-deep vibration[J].Magazine of Concrete Research,2019,71(7):373―384.
[21]Puente I,Santillli A,Lopez A.Lateral pressure over formwork on large dimension concrete blocks[J].Engineering Structures.2010,32(1):195―206.
[22]Omran A F,Khayat K H.Choice of thixotropic index to evaluate formwork pressure characteristics of self-consolidating concrete[J].Cement and Concrete Research,2014,63:89―97.
[23]Santilli A,Puente I,Tanco M.A factorial design study to determine the significant parameters of fresh concrete lateral pressure and initial rate of pressure decay[J].Construction Building Materials,2011,25(4):1946―1955.
[24]Omran A F,Elaguab Y M,Khayat K H.Effect of placement characteristics on SCC lateral pressure variations[J].Construction Building Materials,2014,66:507―514.
[2]肖潭,胡森,吴伟,等.蜂窝夹层铝建筑模板的几何优化与试验研究[J].工程力学,2019,36(2):195―204.Xiao Tan,Hu Sen,Wu Wei,et al,Geometrical optimization and experimental study of aluminum honeycomb sandwich construction formworks[J].Engineering Mechanics,2019,36(2):195―204.(in Chinese)
[3]GBJ 10―65,钢筋混凝土工程施工及验收规范[S].北京:中国建筑工业出版社,1966.GBJ 10―65,Code for construction and acceptance of concrete structures[S].Beijing:China Architecture&Building Press,1966.(in Chinese)
[4]GBJ 204―83,钢筋混凝土结构工程施工及验收规范[S].北京:中国建筑工业出版社,1984.GBJ 204―83,Code for construction and acceptance of concrete structures[S].Beijing:China Architecture&Building Press,1984.(in Chinese)
[5]GB 50204―92,混凝土结构工程施工及验收规范[S].北京:中国建筑工业出版社,1993.GB 50204―92,Code for construction and acceptance of concrete structures[S].Beijing:China Architecture&Building Press,1993.(in Chinese)
[6]GB 50204―2011,混凝土结构工程施工质量验收规范[S].北京:中国建筑工业出版社,2002.GB 50204―2011,Code for acceptance of constructional quality of concrete structures[S].Beijing:China Architecture&Building Press,2002.(in Chinese)
[7]GB 50666―2011,混凝土结构工程施工规范[S].北京:中国建筑工业出版社,2012.GB 50666―2011,Code for construction of concrete structures[S].Beijing:China Architecture&Building Press,2012.(in Chinese)
[8]JGJ162―2008,建筑施工模板安全技术规范[S].北京:中国建筑工业出版社,2008.JGJ162―2008,Technical code for safety of forms in construction[S].Beijing:China Architecture&Building Press,2008.(in Chinese)
[9]JTG/T F50―2011,公路桥涵施工技术规范[S].北京:人民交通出版社,2011.JTG/T F50―2011,Technical specifications for construction of highway bridge and culverts[S].Beijing:China Communications Press,2011.(in Chinese)
[10]TZ210―2005,铁路混凝土工程施工技术指南[S].北京:中国铁道出版社,2005.TZ210―2005,Technical guide for constructional of railway concrete engineering[S].Beijing:China Railway Publishing House,2005.(in Chinese)
[11]JTJ041―89,公路桥涵施工技术规范[S].北京:人民交通出版社,1990.JTJ041―89,Technical specification for construction of highway bridges and culverts[S].Beijing:China Communications Press,1990.(in Chinese)
[12]张文学,李增银,刘龙.混凝土模板侧压力公式对比分析[J].工业建筑,2014,44(7):132―136.Zhang Wenxue,Li Zengyin and Liu Long.Comparison and analysis on lateral pressure of concrete formwork from different standards[J].Industrial Construction,2014,44(7):132―136.(in Chinese)
[13]谢楠.混凝土浇筑期高大模板支架工作状态的试验测试[J].工程力学,2011,28(1):85―89.Xie Nan.In-situ test of working state of high falsework during concrete placement[J].Engineering Mechanics,2011,28(1):85―89.(in Chinese)
[14]王德利.“贮仓法”计算混凝土侧压力[J].水利水运,1990(7):15―17.Wang Deli.Calculation of lateral pressure of fresh concrete by“feed bin”method[J].Port&Waterway Engineering,1990(7):15―17.(in Chinese)
[15]Zhang Wenxue,Huang Jian,Li Yunkai and Xie Quanyi,Study of formwork pressure of column under ultra-deep vibration[J].Magzine of Concrete Research,2016,68(22):1155―1165.
[16]Vanhove Y,Djelal C and Magnin A,Prediction of the lateral pressure exerted by self-compacting concrete on formwork[J].Magazine of Concrete Research,2004,56(1):55―62.
[17]ACI Committee 347,Guide to formwork for concrete[S].Farmington Hills,MI,USA:ACI Standard,2004.
[18]CIRIA Report 108.Concrete pressure on formwork[S].London,UK:Construction Industry Research and Information Association,1985.
[19]Janssen H A.Versucheüber Getreidedruck in Silozellen.Zeitschr.d.Vereines deutscher Ingenieure[J].1895,39(35):1045―1049.
[20]Zhang Wenxue,Chen Ying,Li Yunkai,et al.Study of formwork pressure of wall under ultra-deep vibration[J].Magazine of Concrete Research,2019,71(7):373―384.
[21]Puente I,Santillli A,Lopez A.Lateral pressure over formwork on large dimension concrete blocks[J].Engineering Structures.2010,32(1):195―206.
[22]Omran A F,Khayat K H.Choice of thixotropic index to evaluate formwork pressure characteristics of self-consolidating concrete[J].Cement and Concrete Research,2014,63:89―97.
[23]Santilli A,Puente I,Tanco M.A factorial design study to determine the significant parameters of fresh concrete lateral pressure and initial rate of pressure decay[J].Construction Building Materials,2011,25(4):1946―1955.
[24]Omran A F,Elaguab Y M,Khayat K H.Effect of placement characteristics on SCC lateral pressure variations[J].Construction Building Materials,2014,66:507―514.