基于断裂力学的高强度钢材梁柱节点受力性能分析
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摘要
为了研究国产Q460C高强度结构钢材梁柱节点的断裂行为,该文基于断裂力学理论,计算了Q460C高强度钢材焊缝及热影响区材料的断裂韧性,并且采用三维有限元断裂模型,以I型裂纹尖端应力强度因子KI和J积分为定量的评价指标,分析了焊缝及热影响区不同长度的裂纹对梁柱节点断裂韧性的需求。弹性分析表明,KI沿梁翼缘宽度方向呈W形分布,最大值出现在翼缘中心,且与名义弯曲应力呈线性关系,而焊根裂纹的断裂韧性需求比热影响区裂纹更高。弹塑性分析表明,JI最大值出现在翼缘的边缘,热影响区裂纹的断裂韧性需求比焊根裂纹更高。研究结果表明,Q460C高强度钢材梁柱节点的断裂由焊根裂纹控制,断裂承载力与梁全截面塑性承载力相近,临界转角小于0.02rad,因此建议通过改善焊接工艺或局部构造来保证节点拥有足够的转动能力。
To investigate the fracture behavior of beam-column connections using high strength structural steel Q460 C with nominal yield strength of 460 MPa, which is widely applied in China in recent years, fracture toughness of weld metal and heat affected zone(HAZ) of Q460 C high strength steel was calculated based on fracture mechanics in this study. A three-dimensional finite element fracture model was proposed to provide quantitative estimates of fracture toughness demands in terms of the elastic stress intensity factor(KI) and inelastic J-Integral(JI) around crack tips. The elastic analyses indicated that KI was distributed along the width of beam flange as a ‘W' shape, with the maximum value appearing at the center of beam flange, and was linearly related to the nominal bending stress, while the initial crack at weld interface required more toughness demands than the crack at HAZ. The elasto-plastic analyses indicated that JI approached the maximum value at the edge of beam flange and initial crack at weld interface required less toughness demands than that of the crack at HAZ. Based on the results, fracture of the connection was more likely to occur at weld interface area, and the critical resistance was approximately the plastic load of beam section, with a critical rotation of less than 0.02 rad. It is recommended that welding techniques or local configurations be improved to guarantee adequate rotation capacity.
引文
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