fib 2010的徐变系数模型分析
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摘要
对徐变系数,分析和对比了fib混凝土结构模式规范的1990模型和2010模型。2010模型的数学形式有较大的改变,表示为基本徐变系数和干燥徐变系数的和形式,两个系数分别表示为若干因子的连乘形式,并分别对两个系数给出了相应的混凝土抗压强度和时间影响因子。2010模型显著加强了与混凝土抗压强度影响因子的反比关系,修正了1990模型低估低强度混凝土徐变系数以及高估高强度混凝土徐变系数的情况。
For creep coefficient,the 1990 model and 2010 model of fib concrete structure model were analyzed and compared. The mathematical model of the 2010 model had a great change,which was expressed as the sum of the basic creep and the drying creep,each creep coefficients respectively for a multiplicative form of a number of factors,and at the same time the two coefficients were given the corresponding compressive strength of concrete influence factor,and the time evolution equation. Fib 2010 model significantly enhanced the inverse proportional relation between the compressive strength and creep coefficient of concrete,amended before CEB-FIB 1990 model underestimated the low strength concrete and overestimated the creep coefficient of high-strength concrete.
For creep coefficient,the 1990 model and 2010 model of fib concrete structure model were analyzed and compared. The mathematical model of the 2010 model had a great change,which was expressed as the sum of the basic creep and the drying creep,each creep coefficients respectively for a multiplicative form of a number of factors,and at the same time the two coefficients were given the corresponding compressive strength of concrete influence factor,and the time evolution equation. Fib 2010 model significantly enhanced the inverse proportional relation between the compressive strength and creep coefficient of concrete,amended before CEB-FIB 1990 model underestimated the low strength concrete and overestimated the creep coefficient of high-strength concrete.
引文
[1]Fib model code for concrete structures 2010[S].Berlin:Ernst&Sohn,2013.
[2]Design of concrete structures:EN1992-1-1 Eurocode 2[S].Berlin:Beuth Verlag Gmb H,2004.
[3]公路钢筋混凝土及预应力混凝土桥涵设计规范:JTG D 62—2004[S].北京:人民交通出版社,2004.
[4]周履,陈永春.收缩徐变[M].北京:中国铁道出版社,1994.
[5]DISCHINGER F.Untersuchungenüber die knicksicherheit,die elastische verformung und das kriechen des betons bei bogenbrücken[J].Der Bauingenieur,1937,3(4):33-34.
[6]ACI Committee 209.Guide for modeling and calculating shrinkage and creep in hardened concrete[R].Michigan:American Concrete Institute,2008.
[7]BAZANT Z P,BAWEIA S.Creep and shrinkage prediction model for analysis and design of concrete structures-model B3[J].Material and Structures,1995,28(6):357-365.
[8]杨健辉,汪洪菊,王建生,等.高强混凝土收缩徐变试验及模型比较分析[J].工业建筑,2015(3):120-125.
[9]曹国辉,胡佳星,张锴,等.混凝土徐变预测模型修正分析[J].建筑结构,2014(5):45-49.
[10]丁文胜,吕志涛,孟少平,等.混凝土收缩徐变预测模型的分析比较[J].桥梁建设,2004(6):13-16.
[2]Design of concrete structures:EN1992-1-1 Eurocode 2[S].Berlin:Beuth Verlag Gmb H,2004.
[3]公路钢筋混凝土及预应力混凝土桥涵设计规范:JTG D 62—2004[S].北京:人民交通出版社,2004.
[4]周履,陈永春.收缩徐变[M].北京:中国铁道出版社,1994.
[5]DISCHINGER F.Untersuchungenüber die knicksicherheit,die elastische verformung und das kriechen des betons bei bogenbrücken[J].Der Bauingenieur,1937,3(4):33-34.
[6]ACI Committee 209.Guide for modeling and calculating shrinkage and creep in hardened concrete[R].Michigan:American Concrete Institute,2008.
[7]BAZANT Z P,BAWEIA S.Creep and shrinkage prediction model for analysis and design of concrete structures-model B3[J].Material and Structures,1995,28(6):357-365.
[8]杨健辉,汪洪菊,王建生,等.高强混凝土收缩徐变试验及模型比较分析[J].工业建筑,2015(3):120-125.
[9]曹国辉,胡佳星,张锴,等.混凝土徐变预测模型修正分析[J].建筑结构,2014(5):45-49.
[10]丁文胜,吕志涛,孟少平,等.混凝土收缩徐变预测模型的分析比较[J].桥梁建设,2004(6):13-16.