王琨, 查志远, 刘宏潮, 陈再现. 预应力型钢混凝土梁-钢管混凝土叠合柱框架中节点受剪性能分析[J]. 工程力学, 2020, 37(8): 89-101. DOI: 10.6052/j.issn.1000-4750.2019.09.0517
引用本文: 王琨, 查志远, 刘宏潮, 陈再现. 预应力型钢混凝土梁-钢管混凝土叠合柱框架中节点受剪性能分析[J]. 工程力学, 2020, 37(8): 89-101. DOI: 10.6052/j.issn.1000-4750.2019.09.0517
WANG Kun, ZHA Zhi-yuan, LIU Hong-chao, CHEN Zai-xian. SHEAR PERFORMANCE ANALYSIS ON COMPOSITE JOINTS CONNECTING PRESTRESSED STEEL REINFORCED CONCRETE BEAMS AND STEEL-TUBE REINFORCED CONCRETE COLUMNS[J]. Engineering Mechanics, 2020, 37(8): 89-101. DOI: 10.6052/j.issn.1000-4750.2019.09.0517
Citation: WANG Kun, ZHA Zhi-yuan, LIU Hong-chao, CHEN Zai-xian. SHEAR PERFORMANCE ANALYSIS ON COMPOSITE JOINTS CONNECTING PRESTRESSED STEEL REINFORCED CONCRETE BEAMS AND STEEL-TUBE REINFORCED CONCRETE COLUMNS[J]. Engineering Mechanics, 2020, 37(8): 89-101. DOI: 10.6052/j.issn.1000-4750.2019.09.0517

预应力型钢混凝土梁-钢管混凝土叠合柱框架中节点受剪性能分析

SHEAR PERFORMANCE ANALYSIS ON COMPOSITE JOINTS CONNECTING PRESTRESSED STEEL REINFORCED CONCRETE BEAMS AND STEEL-TUBE REINFORCED CONCRETE COLUMNS

  • 摘要: 基于ABAQUS平台,建立了预应力型钢混凝土梁-钢管混凝土叠合柱框架中节点精细化数值有限元模型,计算得到了柱顶水平荷载-位移滞回和单调加载曲线。在对比计算单调加载和实测滞回曲线基础上,研究了节点在柱顶水平荷载下的破坏全过程,细致考察了框架中节点的混凝土、型钢骨架、钢筋骨架以及预应力筋的应力状态,探讨了此类框架节点的破坏机理;基于参数分析结果,研究了轴压比、预应力度、核心区钢管配钢率和配箍率对节点柱顶水平荷载-位移曲线和核心区剪力-剪切变形的影响,提出了节点核心区受剪承载力计算公式。研究结果表明,当节点试件水平荷载达到峰值点时,核心区钢管、箍筋及预应力筋均达到屈服,核心区混凝土被压碎,此时可作为节点核心区抗剪承载力计算的标志;提出的节点核心区的抗剪承载力计算公式,可供工程设计参考。

     

    Abstract: Based on ABAQUS platform, a refined numerical finite element model of joints in prestressed steel reinforced concrete beam-concrete filled steel tubular composite column frame was established, and the lateral hysteretic and monotonic load-displacement curves at the column top were calculated. On the basis of the comparison of the calculated monotonic and the measured hysteresis curves, the failure process of the joints under lateral loading at the column top was studied, and the stress for concrete, steel skeleton, steel bars and prestressing tendons were carefully investigated, in which the failure mechanism was discussed. Otherwise, the influences of axial compression ratio, prestressing level, steel tube ratio and stirrup ratio in the panel zone on the lateral load-displacement curve at column top and shear-shear deformation in the panel zone were studied according to the results of parameter analysis. Finally, the formulas for calculating the shear capacity in the panel zone of the joint were proposed. The results showed that the steel-tube, stirrups and prestressed tendons reached the yield and the concrete crushed in the panel zone when the lateral load reached the peak value, which could be deemed as the sign for calculating the shear capacity. The presented formula for calculating the shear capacity could be used for a reference in engineering design.

     

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