外包U型钢—混凝土组合梁与方钢管混凝土柱节点静动力性能的试验研究与理论分析
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摘要
外包钢-混凝土组合梁是采用U形冷弯薄壁钢梁,内部填充混凝土与楼板混凝土同时浇注,通过必要的连接措施保证型钢和混凝土共同工作的一种新型组合受弯构件。这种组合梁吸收了普通钢-混凝土组合梁和钢骨混凝土组合梁的优点并克服了它们的缺点,具有用钢量省、稳定性好、刚度大、承载能力高等优点,是一种有良好应用前景的组合构件。但目前对这种组合结构的梁柱连接节点研究还很不完善,特别是采用ANSYS有限元软件对节点进行分析时的本构关系、材料参数的选取都存在许多差异。本文通过足尺模型试验和理论分析对外包U型钢-混凝土组合梁与钢管柱连接节点的静动力性能进行了研究。完成的主要工作和成果包括：
为研究组合结构梁柱节点的静力性能,根据以往的试验及理论分析经验,本文探讨了组合结构梁柱节点的破坏机理和受力特点,并重点研究节点在负弯矩作用下的抗弯承载力和在负弯矩作用下的抗剪承载力,给出两者极限状态的计算公式。分析表明,节点在负弯矩作用下的极限抗弯承载力是决定构件静力性能的主要因素。
为研究组合结构梁柱节点的动力性能,对外包U型钢-混凝土组合梁与钢管柱连接节点进行低周往复荷载作用下的试验研究,得到节点的滞回曲线,分析试件的试验过程并对节点承载力、延性、耗能能力、刚度退化等抗震性能指标进行了比较分析。研究结果表明,组合结构的连接节点刚度大、稳定性好、承载能力高,但耗能能力不强。同时建立了同时考虑几何非线性、钢材与混凝土接触非线性和各种材料非线性的有限元模型,采用ANYSY软件对组合结构连接节点的模型进行了低周反复荷载作用下非线性有限元分析,较为精确模拟了节点域的应力分布规律和受力破坏机理,得到了构件的应力分布、节点的极限承载力、滞回曲线等计算结果,并与试验结果进行验证,二者吻合较好。
The composite beam with U shape steel plate encased concrete is a new type of composite structure. It is formed by U shape steel beam filled with concrete. The essential connectors are designed to ensure the combined action. This kind of composite beam has much advantage over other composite beams, such as steel-saving, good stability, large stiffness and higher bearing capacity. Moreover this type of composite beam avoids many disadvantages of other composite beams and will become a kind of composite component having broad prospect for application. Therefore, the study on the composite beam is important in both theory and application. Researches on the joints of composite structure are not detailed; especially there are many differences in choosing the stress and strain relationships of materials and the properties of materials. Based on the full size model test and theoretical analysis, this research investigates the seismic behavior of the joint between concrete-filled square steel tubular column and composite beam with U shape steel plate encased concrete under cyclic load. The main work and achievements are as follows:
In order to investigate static performance on the joint of composite beam and column, the failure mechanism and mechanical characteristics of this composite beam are discussed based on the experience of previous experimental and theoretical analysis. The flexural capacity under negative moment and shear bearing capacity under negative moment are discussed with emphasis. The computational formulas of two kind of aforementioned bearing capacity in limiting state are provided. According to check calculation, the ultimate flexural capacity under negative moment is main determinant to the static performance of the structural member.
In order to investigate dynamic performance on the joint of composite beam and column, an experiment study was carried out on the joint between concrete-filled square steel tubular column and composite beam with U shape steel plate encased concrete under cyclic load. The experiment process and feature of each specimen are described and load-carrying capacity, ductility, energy dissipation, rigidity degeneration are analyzed. The experiment results verify that this composite beam has much advantage, but the ability of energy dissipation is not strong. Finite element models involving geometric nonlinearity, contact problems between the steel and the concrete and materials nonlinearity are presented. Nonlinear finite element analyses of joint of the composite structure are conducted under low-reversed cyclic loading. Stress distribution in the joint panel zone and the failure mechanism is accurately simulated. The results such as the stress distribution and ultimate bearing capacity of the structure are obtained. Finally, the entire force-displacement curves are obtained by the whole nonlinear analysis of composite frames subjected to cyclically loads. Comparing with the results of test, the results of finite element analyses agree well.
为研究组合结构梁柱节点的静力性能,根据以往的试验及理论分析经验,本文探讨了组合结构梁柱节点的破坏机理和受力特点,并重点研究节点在负弯矩作用下的抗弯承载力和在负弯矩作用下的抗剪承载力,给出两者极限状态的计算公式。分析表明,节点在负弯矩作用下的极限抗弯承载力是决定构件静力性能的主要因素。
为研究组合结构梁柱节点的动力性能,对外包U型钢-混凝土组合梁与钢管柱连接节点进行低周往复荷载作用下的试验研究,得到节点的滞回曲线,分析试件的试验过程并对节点承载力、延性、耗能能力、刚度退化等抗震性能指标进行了比较分析。研究结果表明,组合结构的连接节点刚度大、稳定性好、承载能力高,但耗能能力不强。同时建立了同时考虑几何非线性、钢材与混凝土接触非线性和各种材料非线性的有限元模型,采用ANYSY软件对组合结构连接节点的模型进行了低周反复荷载作用下非线性有限元分析,较为精确模拟了节点域的应力分布规律和受力破坏机理,得到了构件的应力分布、节点的极限承载力、滞回曲线等计算结果,并与试验结果进行验证,二者吻合较好。
The composite beam with U shape steel plate encased concrete is a new type of composite structure. It is formed by U shape steel beam filled with concrete. The essential connectors are designed to ensure the combined action. This kind of composite beam has much advantage over other composite beams, such as steel-saving, good stability, large stiffness and higher bearing capacity. Moreover this type of composite beam avoids many disadvantages of other composite beams and will become a kind of composite component having broad prospect for application. Therefore, the study on the composite beam is important in both theory and application. Researches on the joints of composite structure are not detailed; especially there are many differences in choosing the stress and strain relationships of materials and the properties of materials. Based on the full size model test and theoretical analysis, this research investigates the seismic behavior of the joint between concrete-filled square steel tubular column and composite beam with U shape steel plate encased concrete under cyclic load. The main work and achievements are as follows:
In order to investigate static performance on the joint of composite beam and column, the failure mechanism and mechanical characteristics of this composite beam are discussed based on the experience of previous experimental and theoretical analysis. The flexural capacity under negative moment and shear bearing capacity under negative moment are discussed with emphasis. The computational formulas of two kind of aforementioned bearing capacity in limiting state are provided. According to check calculation, the ultimate flexural capacity under negative moment is main determinant to the static performance of the structural member.
In order to investigate dynamic performance on the joint of composite beam and column, an experiment study was carried out on the joint between concrete-filled square steel tubular column and composite beam with U shape steel plate encased concrete under cyclic load. The experiment process and feature of each specimen are described and load-carrying capacity, ductility, energy dissipation, rigidity degeneration are analyzed. The experiment results verify that this composite beam has much advantage, but the ability of energy dissipation is not strong. Finite element models involving geometric nonlinearity, contact problems between the steel and the concrete and materials nonlinearity are presented. Nonlinear finite element analyses of joint of the composite structure are conducted under low-reversed cyclic loading. Stress distribution in the joint panel zone and the failure mechanism is accurately simulated. The results such as the stress distribution and ultimate bearing capacity of the structure are obtained. Finally, the entire force-displacement curves are obtained by the whole nonlinear analysis of composite frames subjected to cyclically loads. Comparing with the results of test, the results of finite element analyses agree well.
引文
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[15]Shun-ichi Nakamura.Bending behavior of composite girders with cold formed steel U section [J]. Journal of structural engineering.2002,128(9):1169～1174
[16]聂建国,沈聚敏,延滨,吴正直.冷弯薄壁型钢-混凝土组合梁的实验研究及应用[J].建筑结构.1998,(1)：54-56
[17]毛小勇.轻钢-混凝土组合梁组合板的静力及抗火性能研究[D].哈尔滨工业大学博士论文.2002
[18]杜德润,李爱群,陈丽华等.外包钢-混凝土组合简支梁试验研究[J].建筑结构.2006,36(4)：64-67
[19]韩林海,杨有福.现代钢管混凝土结构技术[M].北京：中国建筑工业出版社,2004.
[20]刘维亚.钢与混凝土组合结构理论与实践[M].北京：中国建筑工业出版社,2008.
[21]钟善桐.钢管混凝土结构[M].北京：清华大学出版社,2003.
[22]蔡绍怀.现代钢管混凝土结构[M].北京：人民交通出版社,2003.
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[24]Gerstle K. H. Effect of Connections on Frames [J]. Journal of Constructional Steel Research, 1988(10),241-267
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[26]Travis P.Green,Roberto T.Leon,Gian A.Rassati.Bidirectional rest on partially restrained,composite beam-to-beam connections[J].Journal of strcture engineering.2004,130(2):320～327
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