钢筋混凝土受弯构件裂纹发展规律研究
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摘要
现行混凝土结构理论仅考虑“破坏”状态时的极限平衡来计算结构的承载力,这种处理问题的方式对评价结构的承载力性能虽然有效,但却忽略了结构从开裂到破坏的全过程分析。
钢筋混凝土结构在正常使用情况下是带裂纹工作的,结构从开裂到破坏有一个漫长的带裂纹工作的过程,其裂纹的发生发展规律以及裂纹的发生发展对结构性能的影响需要全面、深入、科学的描述和分析。而高强钢筋混凝土与普通钢筋混凝土受弯构件的裂纹发展规律是否有所区别,钢筋混凝土结构的设计能否有新的思路都需要我们来研究、探讨。
本文基于断裂力学基本原理分析了钢筋混凝土结构中钢筋的阻裂机理;并用有限元软件进行了建模计算,进行了高强钢筋混凝土梁和普通钢筋混凝土梁的裂纹发展规律试验。首先对钢筋混凝土结构的阻裂机理进行了认真深入的分析表明,钢筋以闭合力的方式发挥作用,钢筋的闭合力减小了裂纹尖端的应力强度因子;然后利用有限元软件MSC.Marc对素混凝土小梁和钢筋混凝土小梁进行了断裂力学有限元建模计算,验证了钢筋优越的阻裂性能,由于钢筋闭合力的作用,裂纹尖端应力强度因子随裂纹高度先缓慢增大后急速下降,得出了钢筋的作用将使混凝土梁的裂纹在0.75倍左右梁高止裂的重要结论;最后通过对高强钢筋混凝土梁和普通钢筋混凝土梁的试验,验证了有限元计算的钢筋止裂结论,并且分析了加载过程中裂纹间距、高度及宽度情况,总结得出了高强钢筋混凝土梁和普通钢筋混凝土梁的裂纹发展的四个阶段,对比了高强钢筋混凝土梁和普通钢筋混凝土梁裂纹发展规律的不同点。
本文通过有限元计算和高强钢筋混凝土结构、普通钢筋混凝土结构的试验,揭示了钢筋的阻裂规律,通过对比两种钢筋混凝土受弯构件的裂纹发展规律提出了基于裂纹发展阶段论的钢筋混凝土结构设计新构想。
The existing concrete structure theory only considers the limit equilibrium state destroyed to calculate the bearing capacity of the structure. The way to deal with the problem may be effective for bearing capacity of the structure, but it ignores the entire process of analysis of the structure from cracking to damage.
The reinforced concrete structure works with cracks under the normal usage status. Structure goes through a long process from cracking to damage working with cracks. It needs a comprehensive, in-depth and scientific description and analysis for the law of the crack occurrence and development and the occurrence and development of cracks on structural properties. Whether the laws of the development of the cracks are different between the high-strength reinforced concrete and ordinary reinforced concrete flexural members, and it is also need to study that the design of reinforced concrete structures could have new ideas.
This article analyzes the resistance mechanism of crack in reinforced concrete structure bases on the basic principles of fracture mechanics; and It uses finite element model to calculate. It does tests of flexural members about the high-strength reinforced concrete and the ordinary reinforced concrete. First, it does a depth analysis about the resistance mechanism of reinforced concrete structure. It shows that the closure force of reinforced steel bars in order to play a role in the way, reinforced edge of the closure of the crack tip reduces the stress intensity factor; then use finite element software MSC. Marc to build the fracture mechanics finite element modeling to analyze plain concrete beam and reinforced concrete beam, It verifies that steel has a superior performance to resistance the crack, Because the steel had closed force, stress intensity factor at crack tip with crack height is first slowly increasing and then rapidly declining. The crack will not develop when it develop to the beam’s height of about 0.75 times with the effect of the steel. Through the test of high-strength reinforced concrete and ordinary reinforced concrete beam, it verifies that the finite element calculation of preventing crack of steel is right. It analyzes the process of crack spacing, height and width of the situation in loading process. It summed up to draw the four stages of development of the crack about the high-strength reinforced concrete beam and ordinary reinforced concrete beam. It gets the different law of crack development between the high-strength reinforced concrete beams and reinforced concrete beam.
In this paper, the laws of resistance crack of steel have been revealed by the finite element analysis and the test of high-strength reinforced concrete structure and reinforced concrete structure. By summing up the law of development of crack about two reinforced concrete flexural members, the new design ideas of reinforced concrete structures are received.
钢筋混凝土结构在正常使用情况下是带裂纹工作的,结构从开裂到破坏有一个漫长的带裂纹工作的过程,其裂纹的发生发展规律以及裂纹的发生发展对结构性能的影响需要全面、深入、科学的描述和分析。而高强钢筋混凝土与普通钢筋混凝土受弯构件的裂纹发展规律是否有所区别,钢筋混凝土结构的设计能否有新的思路都需要我们来研究、探讨。
本文基于断裂力学基本原理分析了钢筋混凝土结构中钢筋的阻裂机理;并用有限元软件进行了建模计算,进行了高强钢筋混凝土梁和普通钢筋混凝土梁的裂纹发展规律试验。首先对钢筋混凝土结构的阻裂机理进行了认真深入的分析表明,钢筋以闭合力的方式发挥作用,钢筋的闭合力减小了裂纹尖端的应力强度因子;然后利用有限元软件MSC.Marc对素混凝土小梁和钢筋混凝土小梁进行了断裂力学有限元建模计算,验证了钢筋优越的阻裂性能,由于钢筋闭合力的作用,裂纹尖端应力强度因子随裂纹高度先缓慢增大后急速下降,得出了钢筋的作用将使混凝土梁的裂纹在0.75倍左右梁高止裂的重要结论;最后通过对高强钢筋混凝土梁和普通钢筋混凝土梁的试验,验证了有限元计算的钢筋止裂结论,并且分析了加载过程中裂纹间距、高度及宽度情况,总结得出了高强钢筋混凝土梁和普通钢筋混凝土梁的裂纹发展的四个阶段,对比了高强钢筋混凝土梁和普通钢筋混凝土梁裂纹发展规律的不同点。
本文通过有限元计算和高强钢筋混凝土结构、普通钢筋混凝土结构的试验,揭示了钢筋的阻裂规律,通过对比两种钢筋混凝土受弯构件的裂纹发展规律提出了基于裂纹发展阶段论的钢筋混凝土结构设计新构想。
The existing concrete structure theory only considers the limit equilibrium state destroyed to calculate the bearing capacity of the structure. The way to deal with the problem may be effective for bearing capacity of the structure, but it ignores the entire process of analysis of the structure from cracking to damage.
The reinforced concrete structure works with cracks under the normal usage status. Structure goes through a long process from cracking to damage working with cracks. It needs a comprehensive, in-depth and scientific description and analysis for the law of the crack occurrence and development and the occurrence and development of cracks on structural properties. Whether the laws of the development of the cracks are different between the high-strength reinforced concrete and ordinary reinforced concrete flexural members, and it is also need to study that the design of reinforced concrete structures could have new ideas.
This article analyzes the resistance mechanism of crack in reinforced concrete structure bases on the basic principles of fracture mechanics; and It uses finite element model to calculate. It does tests of flexural members about the high-strength reinforced concrete and the ordinary reinforced concrete. First, it does a depth analysis about the resistance mechanism of reinforced concrete structure. It shows that the closure force of reinforced steel bars in order to play a role in the way, reinforced edge of the closure of the crack tip reduces the stress intensity factor; then use finite element software MSC. Marc to build the fracture mechanics finite element modeling to analyze plain concrete beam and reinforced concrete beam, It verifies that steel has a superior performance to resistance the crack, Because the steel had closed force, stress intensity factor at crack tip with crack height is first slowly increasing and then rapidly declining. The crack will not develop when it develop to the beam’s height of about 0.75 times with the effect of the steel. Through the test of high-strength reinforced concrete and ordinary reinforced concrete beam, it verifies that the finite element calculation of preventing crack of steel is right. It analyzes the process of crack spacing, height and width of the situation in loading process. It summed up to draw the four stages of development of the crack about the high-strength reinforced concrete beam and ordinary reinforced concrete beam. It gets the different law of crack development between the high-strength reinforced concrete beams and reinforced concrete beam.
In this paper, the laws of resistance crack of steel have been revealed by the finite element analysis and the test of high-strength reinforced concrete structure and reinforced concrete structure. By summing up the law of development of crack about two reinforced concrete flexural members, the new design ideas of reinforced concrete structures are received.
引文
[1]叶见曙.结构设计原理.人民交通出版社.2005
[2]黄锋.FRP复合钢筋混凝土结构阻裂增强的有限元分析与试验研究.重庆交通大学硕士论文.2008
[3]舒士霖.钢筋混凝土结构.浙江大学出版社.2003
[4]中华人民共和国第十届全国人民代表大会第三次会议代表建议、批评和意见(第1035号)
[5]柯宇.高强钢筋应用中的裂缝控制.广东建材.2006.5.50-52
[6]王铁梦.工程结构裂缝控制.中国建筑工业出版社.1997
[7]杨庆国.基于断裂力学原理的一种复合钢筋混凝土新结构.硕士论文.2002
[8]杨卫宏.微观断裂力学.国防工业出版社.1995
[9]洪起超.工程断裂力学基础.上海交通大学出版社.1996
[10]周志祥.高等钢筋混凝土结构.人民交通出版社.2002
[11]赵国藩.高等钢筋混凝土结构.中国建筑工业出版社.2002
[12]赵烈秋.复合钢筋混凝土新结构正截面性能研究.重庆交通学院硕士论文.2003
[13]陈强.FRP复合钢筋混凝土受弯构件实验研究及承载力极限状态数值模拟分析.重庆交通学院硕士论文.2003
[14]甘贤军.GFRP加固钢筋混凝土梁(受弯构件)试验研究.重庆交通学院硕士论文.2004
[15]何小兵.复合钢筋混凝土新结构进一步研究与“放阻”相结合的裂缝控制新方法.重庆交通学院硕士论文.2004
[16]陈舣亦.GFRP复合钢筋混凝土梁增强性能分析研究.重庆交通学院硕士论文.2005
[17]车承志.“放阻”结合的复合钢筋混凝土新结构的力学原理与实验研究.重庆交通学院硕士论文.2005
[18]吕奖国.钢筋混凝土结构的裂纹控制思想与结构设计新方法.重庆交通大学硕士论文.2006
[19]常国强.预裂高强钢筋混凝土结构疲劳实验研究.重庆交通大学硕士.2007
[20]李建伟.预裂预应力钢筋混凝土疲劳性能分析.重庆交通大学硕士论文.2007
[21]谷建义.FRP阻裂增强梁的有限元分析与试验研究.重庆交通大学硕士论文.2008
[22]易志坚等.基于断裂力学原理的钢筋混凝土复合新结构设计理论研究.国家自然科学基金项目.2006
[23]林同炎,NED H.BURNS著.路湛沁,黄棠,马誉美译.预应力混凝土结构设计.中国铁道出版社.1983
[24]尹双增.断裂损伤理论及应用.清华大学出版社.1992
[25]杨卫.宏微观断裂力学.国防工业出版社.1995
[26]郦正能,何庆芝.工程断裂力学.北京航空航天大学出版社.1993
[27] D.布洛克.工程断裂力学基础.科学出版社.1980
[28]洪起超,陈箎,蔡其巩,王仁智.工程断裂力学.国防工业出版社.1977
[29]陆毅中.工程断裂力学.西安交通大学出版社.1987
[30]中国航空研究院.应力强度因子手册.科学出版社.1981
[31]易志坚.求解应力强度因子的一种新方法.重庆交通学院学报.1991
[32]练章华.现代CAE技术与应用教程.石油工业出版社.2004
[33] Rice,J.R.,Rosengren,G.F.,J.Mech.Phys.Sol.16.1968
[34] Wells,A.A.,Int.J.Fract. 19.1973
[35] Sumpter,I.D.G.,Turner,C.E. Int.J.Fract.19.1973
[36]陈火红等.Marc2000有限元实例分析教程.机械工业出版社.2002
[37]陈火红等.MSC.Marc/Mentat 2003基础与应用实例.科学出版社.2004
[38] Sherif S.Morcos and Reidar Borhovde. Frcture Modeling of Concrete and Steel.Journal of Structural Engineering.Vo1.121,No.7,Ju1y,1995
[39] Peter H.Feenstra and Rene de Borst. Constitutive Mode for Reinforced Concrete.Journal of Engineering Mechanics.Vol.l,No.5,May.1995
[40] H.Marzouk and A.W.Chen.Fracture Energy and Tension Proterties of High-Strength Concrete.Journalof Materials in Civil Engineering.Vo1.7.No.2,May.1995
[41] L.J.Sluys and R.de Borst.Failure in Plain and Reinforced Concrete an Analysis of Crack Width and Crack Spacing int.J.Solids Structures, Vo1.33,No.20-22.1996
[2]黄锋.FRP复合钢筋混凝土结构阻裂增强的有限元分析与试验研究.重庆交通大学硕士论文.2008
[3]舒士霖.钢筋混凝土结构.浙江大学出版社.2003
[4]中华人民共和国第十届全国人民代表大会第三次会议代表建议、批评和意见(第1035号)
[5]柯宇.高强钢筋应用中的裂缝控制.广东建材.2006.5.50-52
[6]王铁梦.工程结构裂缝控制.中国建筑工业出版社.1997
[7]杨庆国.基于断裂力学原理的一种复合钢筋混凝土新结构.硕士论文.2002
[8]杨卫宏.微观断裂力学.国防工业出版社.1995
[9]洪起超.工程断裂力学基础.上海交通大学出版社.1996
[10]周志祥.高等钢筋混凝土结构.人民交通出版社.2002
[11]赵国藩.高等钢筋混凝土结构.中国建筑工业出版社.2002
[12]赵烈秋.复合钢筋混凝土新结构正截面性能研究.重庆交通学院硕士论文.2003
[13]陈强.FRP复合钢筋混凝土受弯构件实验研究及承载力极限状态数值模拟分析.重庆交通学院硕士论文.2003
[14]甘贤军.GFRP加固钢筋混凝土梁(受弯构件)试验研究.重庆交通学院硕士论文.2004
[15]何小兵.复合钢筋混凝土新结构进一步研究与“放阻”相结合的裂缝控制新方法.重庆交通学院硕士论文.2004
[16]陈舣亦.GFRP复合钢筋混凝土梁增强性能分析研究.重庆交通学院硕士论文.2005
[17]车承志.“放阻”结合的复合钢筋混凝土新结构的力学原理与实验研究.重庆交通学院硕士论文.2005
[18]吕奖国.钢筋混凝土结构的裂纹控制思想与结构设计新方法.重庆交通大学硕士论文.2006
[19]常国强.预裂高强钢筋混凝土结构疲劳实验研究.重庆交通大学硕士.2007
[20]李建伟.预裂预应力钢筋混凝土疲劳性能分析.重庆交通大学硕士论文.2007
[21]谷建义.FRP阻裂增强梁的有限元分析与试验研究.重庆交通大学硕士论文.2008
[22]易志坚等.基于断裂力学原理的钢筋混凝土复合新结构设计理论研究.国家自然科学基金项目.2006
[23]林同炎,NED H.BURNS著.路湛沁,黄棠,马誉美译.预应力混凝土结构设计.中国铁道出版社.1983
[24]尹双增.断裂损伤理论及应用.清华大学出版社.1992
[25]杨卫.宏微观断裂力学.国防工业出版社.1995
[26]郦正能,何庆芝.工程断裂力学.北京航空航天大学出版社.1993
[27] D.布洛克.工程断裂力学基础.科学出版社.1980
[28]洪起超,陈箎,蔡其巩,王仁智.工程断裂力学.国防工业出版社.1977
[29]陆毅中.工程断裂力学.西安交通大学出版社.1987
[30]中国航空研究院.应力强度因子手册.科学出版社.1981
[31]易志坚.求解应力强度因子的一种新方法.重庆交通学院学报.1991
[32]练章华.现代CAE技术与应用教程.石油工业出版社.2004
[33] Rice,J.R.,Rosengren,G.F.,J.Mech.Phys.Sol.16.1968
[34] Wells,A.A.,Int.J.Fract. 19.1973
[35] Sumpter,I.D.G.,Turner,C.E. Int.J.Fract.19.1973
[36]陈火红等.Marc2000有限元实例分析教程.机械工业出版社.2002
[37]陈火红等.MSC.Marc/Mentat 2003基础与应用实例.科学出版社.2004
[38] Sherif S.Morcos and Reidar Borhovde. Frcture Modeling of Concrete and Steel.Journal of Structural Engineering.Vo1.121,No.7,Ju1y,1995
[39] Peter H.Feenstra and Rene de Borst. Constitutive Mode for Reinforced Concrete.Journal of Engineering Mechanics.Vol.l,No.5,May.1995
[40] H.Marzouk and A.W.Chen.Fracture Energy and Tension Proterties of High-Strength Concrete.Journalof Materials in Civil Engineering.Vo1.7.No.2,May.1995
[41] L.J.Sluys and R.de Borst.Failure in Plain and Reinforced Concrete an Analysis of Crack Width and Crack Spacing int.J.Solids Structures, Vo1.33,No.20-22.1996
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