钢管约束混凝土轴压和偏压构件静力性能研究

发布时间：2018-03-13 23:11

本文选题：钢管约束钢筋混凝土　切入点：钢管约束型钢混凝土　出处：《哈尔滨工业大学》2014年博士论文　论文类型：学位论文

【摘要】：钢管约束混凝土柱是在钢管混凝土柱、箍筋约束混凝土柱和型钢混凝土柱的基础上发展起来的一种新型组合结构构件，具有承载力高、延性好、抗火性能好、施工方便等优点。目前国内外对钢管约束混凝土柱的研究刚刚起步，以往的研究也主要集中在轴压短柱方面，而对工程中最为常见的偏压构件鲜有报道。本文对钢管约束混凝土偏压构件进行了试验研究及理论分析，，主要内容包括： (1)进行了8个圆钢管约束钢筋混凝土轴压试件和16个圆钢管约束钢筋混凝土偏压试件试验研究，主要参数为长细比、偏心距及钢管约束模式。分析了不同钢管约束模式试件的破坏模式，测得了试件的荷载-位移曲线、荷载-钢管应力全过程曲线，建立了圆钢管约束钢筋混凝土偏压构件力学模型。建立了圆钢管约束钢筋混凝土偏压中长柱有限元模型，对圆钢管约束钢筋混凝土中长柱进行了全过程有限元分析。 (2)进行了8个方钢管约束钢筋混凝土轴压试件和16个方钢管约束钢筋混凝土偏压试件试验研究，主要参数为长细比、偏心距及钢管约束模式。分析了不同钢管约束模式试件的破坏模式，测得了试件的荷载-位移曲线、荷载-钢管应力全过程曲线，建立了方钢管约束钢筋混凝土偏压构件力学模型。建立了方钢管约束钢筋混凝土偏压中长柱有限元模型，对方钢管约束钢筋混凝土中长柱进行了全过程有限元分析。 (3)进行了12个圆钢管约束型钢混凝土轴压试件和12个圆钢管约束型钢混凝土偏压试件试验研究，主要参数为长细比、偏心距、钢管约束模式及不同的抗剪连接件设置方式。分析了不同钢管约束模式试件的破坏模式，测得了试件的荷载-位移曲线、荷载-钢管全过程应力曲线，分析了抗剪连接件的影响，建立了圆钢管约束钢筋混凝土偏压构件力学模型。建立了圆钢管约束钢筋混凝土偏压中长柱有限元模型，对圆钢管约束钢筋混凝土中长柱进行了全过程有限元分析。 (4)进行了12个方钢管约束型钢混凝土轴压试件和12个方钢管约束型钢混凝土偏压试件试验研究，主要参数为长细比、偏心距、钢管约束模式及不同的抗剪连接件设置方式。分析了不同钢管约束模式试件的破坏模式，测得了试件的荷载-位移曲线、荷载-钢管应力全过程曲线，分析了抗剪连接件的影响，建立了方钢管约束钢筋混凝土偏压构件力学模型。建立了方钢管约束钢筋混凝土偏压中长柱有限元模型，对方钢管约束钢筋混凝土中长柱进行了全过程有限元分析。 (5)采用基于Mander模型的约束混凝土本构关系，通过纤维模型法计算了试件的荷载-位移曲线；试验结果表明该模型适用于钢管约束混凝土构件，基于该模型计算了钢管约束混凝土的等效矩形应力。基于能量原理，计算了钢管约束混凝土极限压应变；基于钢管约束混凝土的等效矩形应力、钢管约束混凝土极限压应变，建立了钢管约束钢筋混凝土截面偏压承载力公式。采用切线模量法建议了钢管约束混凝土构件稳定系数，并基于约束混凝土本构关系建立了钢管约束混凝土构件偏心距增大系数计算方法。 (6)基于截面全塑性假定，采用纤维模型法计算了钢管约束型钢混凝土偏压构件的N-M相关曲线，并采用曲线上的4个特征点，建立了钢管约束型钢混凝土截面偏压承载力简化计算公式；基于截面N-M相关曲线，通过折减弯矩的方法，提出了构件N-M稳定相关曲线，并提出了钢管约束型钢混凝土构件偏压承载力简化计算公式。
[Abstract]:Steel tube confined concrete column in steel tube concrete column, a new type of composite structure component based development of confined concrete columns and steel reinforced concrete columns on the rise, with high bearing capacity, good ductility, good fire resistance, the advantages of convenience. The current research of steel tube confined concrete columns at home and abroad in the past has just started. The study also focused on the columns, and the engineering are the most common members rarely reported. This paper carried out experimental research and theoretical analysis of steel tube confined concrete columns, the main contents include:
(1) the 8 circular tubed reinforced concrete axial compression specimens and 16 circular tube confined reinforced concrete eccentric specimens of test pieces, the main parameters for the slenderness ratio, eccentricity and constraint model. Analysis of different steel tube confined mode failure mode of specimen, measured displacement curve of the test load, load - stress curve of steel tube, a circular tube confined concrete members. A mechanical model of long column finite element model of circular tube confined reinforced concrete eccentric, long columns of circular tubed reinforced concrete finite element analysis of the whole process.
(2) for 8 square tubed reinforced concrete axial compression specimens and 16 square tubed reinforced concrete eccentric specimens of test pieces, the main parameters for the slenderness ratio, eccentricity and constraint model. Analysis of different steel tube confined mode failure mode of specimen, measured displacement curve of the test load, load - stress curve of steel tube, a square tube confined reinforced concrete columns, mechanical model is established. The finite element model of the long column of square steel tube confined reinforced concrete eccentric compression, the other steel tube confined reinforced concrete columns are analyzed by the finite element analysis of the whole process.
(3) the 12 circular tubed steel reinforced concrete axial compression specimens and 12 circular tubed steel reinforced concrete eccentric specimens of test pieces, the main parameters for the slenderness ratio, eccentricity, steel tube confined mode and shear connectors of different set mode. Analysis of different steel tube confined mode failure pattern, measured specimen the load displacement curve, the whole process of load stress curves of tube, analyzed the affect of shear connectors, a circular tube confined concrete members. A mechanical model of long column finite element model of circular tube confined reinforced concrete eccentric, long column of circular steel tube reinforced concrete finite element analysis was carried out in the whole process.
(4) the pilot study on test specimens and 12 STSRC bias 12 STSRC axial pressure, the main parameters for the slenderness ratio, eccentricity, steel tube confined mode and shear connectors of different set mode. Analysis of different steel tube confined mode failure pattern, measured specimen the load displacement curve, load stress curves of steel pipe, analyzes the influence of shear connectors, a square steel tube confined concrete members. A mechanical model of long column finite element model of square tube confined reinforced concrete eccentric compression, the other steel tube confined reinforced concrete in the long column are analyzed by the finite element analysis of the whole process.
(5) the constitutive relationship of confined concrete based on Mander model, the load displacement curve of specimen is calculated by fiber model method; the experimental results show that the model is suitable for steel tube confined concrete component, the equivalent rectangular steel tube confined concrete stress was calculated based on the model. Based on the principle of energy, steel tube confined concrete ultimate compressive strain the calculation of stress; equivalent rectangular steel tube confined concrete based on steel tube confined concrete ultimate compressive strain, a steel tube confined reinforced concrete section bias formula for the bearing capacity of steel tube confined concrete component. The stability coefficient was proposed by tangent modulus method, and based on the established constitutive relationship of confined concrete in steel tube confined concrete component eccentricity coefficient calculation method.
(6) section based on the assumption of full plastic, N-M curve of steel tube confined steel reinforced concrete columns were calculated by fiber model method, and the 4 feature points on the curve, a simplified formula for calculating the bearing capacity of steel tube confined steel reinforced concrete section based on section bias; N-M curve, the method of reducing the bending moment fold, put forward N-M component stability curve, and puts forward the simplified calculation formula of the bearing capacity of steel tube confined steel reinforced concrete member bias.

【学位授予单位】：哈尔滨工业大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU398.9

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