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RESEARCH ON EFFECTS OF WELDING SEAMS OF WELD ACCESS HOLE LINERS ON FRACTURE PROPERTIES OF STEEL FRAME BEAM COLUMN JOINTS
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摘要: 设计了5个高强钢T型节点试件，采用拉卸循环加载试验和有限元数值分析方法，研究其过焊孔衬板焊缝对节点断裂性能的影响；基于T型连接件研究基础，设计了3个钢框架梁柱节点试件，采用低周循环往复加载试验方法研究过焊孔衬板焊缝对梁柱节点断裂性能的影响。结果表明：高强钢T型连接件中过焊孔衬板焊缝对试件断裂性能影响显著，当过焊孔衬板采用双边或四边焊缝时，在极限荷载下可将试件焊缝处的应力峰值移至腹板区域，与传统过焊孔衬板单边焊缝试件相比，其塑性变形能力得到显著提高；将钢框架梁柱节点传统过焊孔衬板焊缝改为双边或四边焊缝后，其节点延性、极限承载能力均得到有效改善，与传统过焊孔衬板单边焊缝试件相比，采用双边焊缝节点试件的延性系数、极限承载力分别提高约29%、23%；采用四边焊缝节点试件的延性系数、极限承载力分别提高约70%、33%。Abstract: Five high-strength steel T-stub connection specimens were designed, and the effect of welding seams of weld access hole liners on the fracture behaviors of beam-column joints was studied by loading and unloading cycle loading tests and finite element numerical analysis. Based on the research on T-stub connections, three specimens of steel frame beam-column joints were designed, and the fracture behaviors of beam-column joints was studied by the quasi-static loading test.The results indicated that welding seams of weld access hole liners of the high-strength steel T-stub connection had a significant effect on the fracture behaviors of the specimens. When weld access hole liners with double-sided weld or four-sided weld were adopted, the peak stresses in the welding seams could be moved to webs under ultimate loads. Compared with the specimens of the weld access hole liner with single-sided welding, the plastic deformation capacity of the specimens was improved significantly. The ductility and ultimate bearing capacity of steel frame beam-column joints were improved by changing the traditional weld of the weld access hole liner to double-sided or four-sided welding. Compared with the specimens of the weld access hole liner with single-sided weld, the ductility coefficients and ultimate bearing capacity of the specimens with double-sided weld increased about 29% and 23%, respectively; the ductility coefficients and ultimate bearing capacity of the specimens with four-sided welding increased about 70% and 33%, respectively.
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Key words:
- weld access hole liner /
- welding seam /
- T-stub connection /
- beam-column joint /
- fracture properties
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