斜拉肋加劲钢管混凝土结构的研究进展

周绪红; 甘丹; 周政; 刘永健; 李泽湘; 李洪鹏

doi:10.13206/j.gjgS23071102

斜拉肋加劲钢管混凝土结构的研究进展

doi: 10.13206/j.gjgS23071102

1. 重庆大学土木工程学院, 重庆 400045;
2. 湖南大学土木工程学院, 长沙 410082

基金项目:

国家自然科学基金项目(52378133，51890902)；重庆市自然科学基金项目(CSTB2023NSCQ-MSX0758)。

详细信息

作者简介:
周绪红，教授，中国工程院院士，主要从事钢结构和钢-混凝土组合结构研究，zhouxuhong@126.com。

通讯作者:
甘丹，教授，主要从事钢结构和钢-混凝土组合结构研究，gandan@cqu.edu.cn。

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出版历程
- 收稿日期: 2023-07-11
- 网络出版日期: 2024-03-29
- 刊出日期: 2024-01-25

Developments of Concrete-Filled Steel Tube Structures Stiffened by Diagonal Ribs

1. College of Civil Engineering, Chongqing University, Chongqing 400045, China;
2. School of Civil Engineering, Hunan University, Changsha 410082, China

Funds:

The anthors wish to acknowledge the support of the Natural Science Foundation of China (52378133, 51890902) and Chongqing Natural Science Foundation (CSTB2023NSCQ-MSX0758).

摘要

摘要: 钢管混凝土柱承载力高、抗震性能优越、造价适中，是超高层结构和大型重载结构常用的竖向承重柱形式。方钢管混凝土柱与圆钢管混凝土柱相比，其截面相对开展，具有抗弯刚度大、抗弯承载力高、节点构造简单、加工施工方便、便于建筑空间布置与装修等优点，因此其在实际工程中应用广泛。然而，研究表明方钢管混凝土的组合效应较弱，需在其钢管内采取加劲措施以提升钢管与混凝土之间的组合作用；同时通常还需在方钢管内焊接剪力连接件提高钢管与混凝土界面的纵向剪力传递能力。已有加劲形式可归纳总结为点约束、横向封闭式约束及开放式纵向线约束。在方钢管的两邻边设置斜拉加劲肋(简称斜拉肋)，是近年来新发展起来的高效加劲形式，斜拉肋可实现纵横向连续封闭式约束，同时具有剪力连接件功能。系统总结了斜拉肋加劲钢管混凝土构件、节点及体系的力学性能及设计方法。在构件层面，对柱的轴压、偏压和抗震性能进行了研究，建议了斜拉肋合理构造形式、钢管宽厚比限值、斜拉肋与钢管的厚度匹配关系及轴压比限值，提出了计算斜拉肋加劲钢管混凝土柱截面压弯承载力的修正塑性应力分布方法，揭示了超短柱的受剪机理并建立了抗剪模型及剪力-剪切变形关系。在节点层面，对斜拉肋加劲钢管混凝土柱-钢筋混凝土梁节点的轴压及抗震性能进行了研究，明确了节点轴压及受剪机理，建议了节点区合理构造以达到“强节点、弱构件”的要求，提出了考虑轴压比及柱受压区高度影响的修正黏结滑移计算公式，该公式可准确预测节点区梁筋的滑移行为。在体系层面，对斜拉肋加劲钢管混凝土柱-钢筋混凝土梁框架进行了静力弹塑性分析、增量动力分析(IDA)及地震易损性分析，明确了体系的屈服机制及抗倒塌机制。研究结果表明，斜拉加劲肋集合了已有的钢管混凝土加劲形式特点，能有效传递界面剪力、约束混凝土、避免或延缓钢管局部屈曲，显著提升了钢管混凝土的承载力、变形能力和抗震性能，具有较大的应用前景。最后列举了斜拉肋加劲钢管混凝土结构的主要工程应用场景，展望了该结构的发展方向和需进一步研究的问题。
- 加劲肋 /
- 多腔室钢管混凝土 /
- 剪力连接件 /
- 力学性能 /
- 局部屈曲 /
- 研究综述
Abstract: Concrete-filled steel tubular (CFST) columns have high strength, favorable seismic performance, reasonable cost, and are widely used as the main structural types in high-rise buildings and heavily-loaded structures. In comparison to circular CFST columns, square CFST columns have the advantages of relatively wide section, large flexural stiffness, high flexural capacity, simple joint details, convenient manufacturing and construction, convenient layout of building space, and easy decoration, and thus are widely used in practical engineering. However, the previous research indicated that the composite action between a rectangular steel tube and the in-filled concrete is relatively weak and can be improved by setting stiffening schemes. Meanwhile, shear connectors are usually welded to the steel tube to improve the interfacial longitudinal shear transfer capacity. The existing stiffening forms are summarized as point-open, point-closed and line-open confinement. The diagonal stiffener, welded on two adjacent sides of a steel tube is referred to as the diagonal rib; it is a new efficient stiffener developed recently and can also be used as the shear connector. This paper systematically summarizes the mechanical behavior and design methods of members, joints, and frames of concrete-filled steel tube stiffened by diagonal ribs. At the level of members, the concentric compression, eccentric compression and seismic behavior of columns were analyzed; the details of diagonal ribs, width-to-thickness ratio limits, thickness matching relationship between the diagonal rib and steel tube, and axial load ratio limits were recommended; the modified plastic stress distribution method was proposed to calculate the strength of columns under combined compression and bending; the shear mechanism of ultra-short columns was figured out, and the shear model and shear force versus shear deformation relationships were proposed. At the level of joint, the axial compression and seismic behavior of CFST column to RC beam joints were studied; the axial compression and shear mechanism were analyzed, and the rational details of the joint zone were suggested to satisfy the requirement of strong-joint/weak-component; the modified equations, which considered the effect of axial load and compression zone height of the column, were proposed to more accurately predict the bond performance of beam reinforcements in the joint zone. At the level of frame system, the pushover analyses, IDA analyses and seismic fragility analyses of CFST column stiffened by diagonal ribs to RC beam frame were conducted, and the yielding mechanism and collapse mechanism were analyzed. The results showed that the diagonal ribs combine the advantages of existing stiffeners, efficiently transferring the interfacial shear force, constraining the concrete and avoiding or postponing the local buckling of steel tube, significantly improve the load capacity, deformation capacity, and seismic performance of square concrete-filled steel tubular columns, and have great application prospect in practical engineering. Finally, the engineering application scenarios for diagonal-rib stiffened CFST structures are listed; the development direction and problems which need further investigation of the structure are outlined.
- stiffeners /
- multi-cell concrete-filled steel tubular column /
- shear connectors /
- mechanical behavior /
- local buckling /
- research review

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