矩形钢管混凝土组合框架节点抗震性能试验研究
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摘要
矩形钢管混凝土组合结构具有强度高、延性好、抗震性能优越、施工方便等特点。开展矩形钢管混凝土梁柱节点的抗震性能研究，对于了解节点力学性能，改善节点构造，促进矩形钢管混凝土组合结构在地震区的推广应用具有重要的理论意义与工程应用价值。
本文借鉴钢框架节点构造，设计了四种类型矩形钢管混凝土柱与钢梁连接节点，包括常规栓焊(WFP)节点、翼缘全螺栓连接(BFP)节点、双T板连接(DST)节点以及加劲端板连接(SEP)节点，进行了四类节点8个模型试件在柱端低周反复荷载作用下的抗震性能试验研究，比较了不同轴压比下节点的滞回性能、强度与刚度退化、延性、破坏机理与破坏特征，主要结论有：
1、节点的位移滞回曲线与转角滞回曲线为块型分布，没有或略有捏拢现象，耗能能力强；
2、轴压比对节点滞回曲线有显著影响，全部节点都有显著的刚度退化；
3、位移与转角骨架曲线在峰值荷载后有较长的水平或下降段，具有良好的延性性能；
4、从整体抗震性能上看，翼缘全螺栓连接节点、双T板连接与加劲端板连接节点都优于常规栓焊节点，可在实际工程中加以推广。
此外，本文探讨了不同的单元类型、不同的网格划分密度、加载方式与边界条件对钢管混凝土组合结构数值计算的影响，运用ANSYS中的APDL语言，编写了适合钢管混凝土结构分析的混凝土材料本构关系程序，并运用该程序结合ANSYS对常规栓焊节点与翼缘全螺栓连接节点的滞回性能进行了初步计算，为进一步地数值分析打下了基础。
The rectangular concrete-filled steel tubular (CFST) composite structures have the special properties, such as high-strength, good ductility, better seismic behavior, and convenient construction, etc. Study on the seismic performance of rectangular concrete-filled steel tubular column to steel beam connections has the important theoretical significance and huge engineering values, and also helps to understand the mechanic behavior and configuration of the connection, to promote the applications of this kind of composite structures in seismic area of China.
In this thesis, four types of steel beam-rectangular CFST column connections, including normal welded flange plate (WFP) connection, bolted flange plate (BFP) connection, stiffened end plate (SEP) connection and double split-tee plate (DST) connection, were designed based on the configuration of steel frame connection. Total 8 models, 2 models of each kind of connections were tested under low-reversed cyclic loading at the end of CFST columns. The relationships between force and displacement at the end of columns, the relationships between the moment and rotation of the joints, degradations of strength and stiffness, ductility, failure mechanism and failure characteristics of these four connections under different axial-compression ratios were presented. The main conclusions are listed as follows:
1. All the cyclic loops of the connections are close to rectangle, and no or little pinch effects can be found. These loops indicate the good dissipation of energy.
2. The axial-compression ratios affect the cyclic loops obviously, and stiffness degradation can be found in all kinds of connections.
3. There are long level or decline segments after peak value in the skeleton curves. That means the connections have excellent ductility.
4. The integral seismic behaviors of other three kinds of connection, namely BFP, DST, and SEP connections are better than that of normal WFP connection.
By the way, finite-element (FE) analyses were conducted to predict the influence on CFST structure under different kinds of elements, mesh density, load manners and boundary conditions. After that, a special program was designed to define the constitutive relationship of concrete material in CFST structures based on APDL in ANSYS program. The preliminary FE nonlinear analyses were concucted on the cyclic-behavior of the WFP and BFP connection under low-reversed cyclic loading by combining the ANSYS and this special program. This kind of work is just the beginning of the cyclic analyses of steel beam to CFST column joints.
本文借鉴钢框架节点构造，设计了四种类型矩形钢管混凝土柱与钢梁连接节点，包括常规栓焊(WFP)节点、翼缘全螺栓连接(BFP)节点、双T板连接(DST)节点以及加劲端板连接(SEP)节点，进行了四类节点8个模型试件在柱端低周反复荷载作用下的抗震性能试验研究，比较了不同轴压比下节点的滞回性能、强度与刚度退化、延性、破坏机理与破坏特征，主要结论有：
1、节点的位移滞回曲线与转角滞回曲线为块型分布，没有或略有捏拢现象，耗能能力强；
2、轴压比对节点滞回曲线有显著影响，全部节点都有显著的刚度退化；
3、位移与转角骨架曲线在峰值荷载后有较长的水平或下降段，具有良好的延性性能；
4、从整体抗震性能上看，翼缘全螺栓连接节点、双T板连接与加劲端板连接节点都优于常规栓焊节点，可在实际工程中加以推广。
此外，本文探讨了不同的单元类型、不同的网格划分密度、加载方式与边界条件对钢管混凝土组合结构数值计算的影响，运用ANSYS中的APDL语言，编写了适合钢管混凝土结构分析的混凝土材料本构关系程序，并运用该程序结合ANSYS对常规栓焊节点与翼缘全螺栓连接节点的滞回性能进行了初步计算，为进一步地数值分析打下了基础。
The rectangular concrete-filled steel tubular (CFST) composite structures have the special properties, such as high-strength, good ductility, better seismic behavior, and convenient construction, etc. Study on the seismic performance of rectangular concrete-filled steel tubular column to steel beam connections has the important theoretical significance and huge engineering values, and also helps to understand the mechanic behavior and configuration of the connection, to promote the applications of this kind of composite structures in seismic area of China.
In this thesis, four types of steel beam-rectangular CFST column connections, including normal welded flange plate (WFP) connection, bolted flange plate (BFP) connection, stiffened end plate (SEP) connection and double split-tee plate (DST) connection, were designed based on the configuration of steel frame connection. Total 8 models, 2 models of each kind of connections were tested under low-reversed cyclic loading at the end of CFST columns. The relationships between force and displacement at the end of columns, the relationships between the moment and rotation of the joints, degradations of strength and stiffness, ductility, failure mechanism and failure characteristics of these four connections under different axial-compression ratios were presented. The main conclusions are listed as follows:
1. All the cyclic loops of the connections are close to rectangle, and no or little pinch effects can be found. These loops indicate the good dissipation of energy.
2. The axial-compression ratios affect the cyclic loops obviously, and stiffness degradation can be found in all kinds of connections.
3. There are long level or decline segments after peak value in the skeleton curves. That means the connections have excellent ductility.
4. The integral seismic behaviors of other three kinds of connection, namely BFP, DST, and SEP connections are better than that of normal WFP connection.
By the way, finite-element (FE) analyses were conducted to predict the influence on CFST structure under different kinds of elements, mesh density, load manners and boundary conditions. After that, a special program was designed to define the constitutive relationship of concrete material in CFST structures based on APDL in ANSYS program. The preliminary FE nonlinear analyses were concucted on the cyclic-behavior of the WFP and BFP connection under low-reversed cyclic loading by combining the ANSYS and this special program. This kind of work is just the beginning of the cyclic analyses of steel beam to CFST column joints.
引文
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[7] 韩林海，杨有福，“矩形钢管混凝土轴心受压构件强度承载力的试验研究”，土木工程学报，2001， 34(4)：22-31。
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[9] 杨有福，韩林海，矩形钢管混凝土构件抗弯力学性能的试验研究，地震工程与工程振动，2001，21(3)：41-48。
[10] 吕西林，陆伟东，反复荷载作用下方钢管混凝土柱的抗震性能试验研究，建筑结构学报，2000，21(2)： 2-11。
[11] 陶忠，韩林海，方钢管混凝土压弯构件滞回性能的试验研究，地震工程与工程振动，2001，21(1)： 74-78。
[12] 吕西林等．方钢管混凝土结构应用技术研究．建筑施工．2000，3：48～54
[13] 赵莉华，方钢管混凝土柱在钢结构住宅中的应用研究，天津大学申请硕士学位论文，天津：天津大学，2002。
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[15] 钢管混凝土结构设计与施工规程(CECS28：90)，北京：中国计划出版社，1992。
[16] 中国电力行业标准．DL／T5085—1999[S]，钢管混凝土组合结构设计规程，北京：中国电力出版社， 1999。
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[19] England, British Standards Institute, BS5400, Part5, Concrete and Composite Bridges, 1979。
[20] American Concrete Institute, Building Code Requirement for Reinforced Concrete And Commentary— ACI318—89, 1989。
[21] European Committee for Standardization, Eurocode No.4, Design of Composite Steel and Concrete Structures, Part1.1: General rules and rules for buildings, Revised draft: March, 1992; Part2:Bridge ,Third draft: January, 1997。
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