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

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

  • 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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