紧贴式“桩墙合一”结构裂缝计算与试验
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摘要
针对紧贴式"桩墙合一"的异形截面构造特征,通过修改钢筋及混凝土的本构模型,使混凝土受压区应力在未屈服时与钢筋应力呈线性关系,并利用力学平衡原理,根据其截面特性,修正《混凝土设计规范》中最大裂缝宽度计算公式中的部分参数,得出其在受弯情况下的最大裂缝宽度计算公式。通过模型试验,研究了紧贴式"桩墙合一"结构在受弯情况下的裂缝发育情况及破坏荷载下不同部位的裂缝宽度分布情况,并将试验结果与本文推导计算公式计算结果及等刚度代换法计算结果相比,本文计算公式能够得到较为理想的结果。本文计算方法简单、实用,可作为"桩墙合一"设计推广的理论依据。
This paper was aimed at tectonic characteristics for what is the clingy "pile-wall"of irregular crosssection,by modifying the constitutive model of steel and concrete,which made the stress of concrete pressured region in unyielding has a linear with reinforcement stress,and using the principle of mechanical equilibrium,according to the cross-section characteristic,which revise some parameters of the calculation formula of maximum crack width for Code for Design of Concrete Structures(GB 50010—2010),and to get the maximum fissure width of the formula in the case of the bending case.Through the model experiments,we have studied the fracture intensity and the different parts of crack distribution in this failure load is studied which was the structure of the attached "pile-wall"is under bending,and it's under the damage load,contrast to which are the model test and the calculation results of modifier formulas,and then replace the stiffness of this deformed section with a T-shaped section,the formulae of the specification are compared with the calculation results,which can get a better result.The results show that:the calculation results of the formula which in this paper was similar to the test result,and the calculation method with equal stiffness substitution is larger than the test deviation.The calculation method which in this paper is simple,reasonable and feasible,it can be used as the theoretical basis for the design promotion of"pile-wall".
This paper was aimed at tectonic characteristics for what is the clingy "pile-wall"of irregular crosssection,by modifying the constitutive model of steel and concrete,which made the stress of concrete pressured region in unyielding has a linear with reinforcement stress,and using the principle of mechanical equilibrium,according to the cross-section characteristic,which revise some parameters of the calculation formula of maximum crack width for Code for Design of Concrete Structures(GB 50010—2010),and to get the maximum fissure width of the formula in the case of the bending case.Through the model experiments,we have studied the fracture intensity and the different parts of crack distribution in this failure load is studied which was the structure of the attached "pile-wall"is under bending,and it's under the damage load,contrast to which are the model test and the calculation results of modifier formulas,and then replace the stiffness of this deformed section with a T-shaped section,the formulae of the specification are compared with the calculation results,which can get a better result.The results show that:the calculation results of the formula which in this paper was similar to the test result,and the calculation method with equal stiffness substitution is larger than the test deviation.The calculation method which in this paper is simple,reasonable and feasible,it can be used as the theoretical basis for the design promotion of"pile-wall".
引文
[1]王卫东,沈健.基坑围护排桩与地下室外墙相结合的“桩墙合一”的设计与分析[J],岩土工程学报,2012,34(增):343-348.
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[6]中华人民共和国交通部.公路钢筋混凝土及预应力混凝土桥涵设计规范(JTG D62-2004)[S].北京:2005.
[7]中华人民共和国住房和城乡建设部.建筑桩基技术规范(JGJ94-2008)[S].北京:2009.
[8]Robert J F.Another look at crack control in reinforced concrete[J].Aci Structural Journal,1999,96(3):437-442.
[9]左人宇,严平,龚晓南.几种桩墙合一的施工工艺[J].建筑技术,2002,33(3):197.
[10]李乾南,熊宗海.圆截面均匀配筋抗滑桩裂缝控制[J].建筑结构,2013,43(8):74-77.
[11]王金金.钢筋混凝土构件受弯性能分析与尺寸效应[D].大连:大连理工大学,2013.
[12]张岐宣.T形截面受弯构件正截面承载能力计算方法[N].《混凝土结构设计规范》应用方法和实例讲座.
[13]《建筑结构静力计算手册》编写组.建筑结构静力计算手册(第二版)[M].北京:中国建筑工业出版社,1998.
[14]胡耘,王卫东.“桩墙合一”结构体系的受力实测与分析[J].岩土工程学报,2015,37(2):197-201.
[15]李萍.板柱结构中板弯矩的试验研究[J].工业建筑,2005,35(5):54-56.
[16]丁嵬.钢筋混凝土结构裂缝宽度计算方法研究[D].天津:天津大学,2007.
[2]刘国彬,王卫东.基坑工程手册(第二版)[M].北京:中国建筑工业出版社,2009.
[3]李龙.圆形截面钢筋混凝土构件裂缝计算宽度的研究[D].大连:大连理工大学,2006.
[4]中华人民共和国住房和城乡建设部.混凝土结构设计规范(GB50010-2010(2016年版))[S].北京:2011.
[5]European Standard.Design of concrete structures-Part1-1:General rules and rules for buildings(EN1992)[S].2004.
[6]中华人民共和国交通部.公路钢筋混凝土及预应力混凝土桥涵设计规范(JTG D62-2004)[S].北京:2005.
[7]中华人民共和国住房和城乡建设部.建筑桩基技术规范(JGJ94-2008)[S].北京:2009.
[8]Robert J F.Another look at crack control in reinforced concrete[J].Aci Structural Journal,1999,96(3):437-442.
[9]左人宇,严平,龚晓南.几种桩墙合一的施工工艺[J].建筑技术,2002,33(3):197.
[10]李乾南,熊宗海.圆截面均匀配筋抗滑桩裂缝控制[J].建筑结构,2013,43(8):74-77.
[11]王金金.钢筋混凝土构件受弯性能分析与尺寸效应[D].大连:大连理工大学,2013.
[12]张岐宣.T形截面受弯构件正截面承载能力计算方法[N].《混凝土结构设计规范》应用方法和实例讲座.
[13]《建筑结构静力计算手册》编写组.建筑结构静力计算手册(第二版)[M].北京:中国建筑工业出版社,1998.
[14]胡耘,王卫东.“桩墙合一”结构体系的受力实测与分析[J].岩土工程学报,2015,37(2):197-201.
[15]李萍.板柱结构中板弯矩的试验研究[J].工业建筑,2005,35(5):54-56.
[16]丁嵬.钢筋混凝土结构裂缝宽度计算方法研究[D].天津:天津大学,2007.