双肋式波形钢腹板工字钢组合连续梁耐火性能研究
Study on Fire Resistance of Double-Ribbed I-Steel Continuous Composite Girder with Corrugated Steel Webs
为研究不同火灾场景下双肋式波形钢腹板工字钢组合连续梁的耐火性能,本文以一连续双肋钢-混凝土组合梁的火灾试验为背景,采用有限元软件ANSYS建立组合梁的热-力耦合数值模型,分析其受火过程中的温升规律及不同受火区域下的结构变形和破坏模式,并进一步研究荷载比、跨高比和腹板波折角变化对其耐火性能的影响。结果表明:火灾作用下,双肋式波形钢腹板工字钢组合连续梁沿梁高方向的升温速率不一致,形成了显著的温度差;不同受火区域组合梁的结构变形和耐火时间均存在较大差异,受火区域越靠近中支点处,组合梁的耐火时间越短;中支点区域受火为组合梁更不利位置,其耐火时间较短并出现了局部屈曲破坏;荷载比变化对边支点区域受火的组合梁耐火性能影响较为显著,荷载比从0.3增大到0.5时,其耐火时间减少了54.4%;减小跨高比对边支点和跨中区域受火的组合梁耐火性能有明显提高,但不同受火区域组合梁的耐火时间均较接近;腹板波折角变化对不同受火区域组合梁的耐火性能影响均较小,且耐火时间接近,基本可以忽略不计。研究成果可为双肋式波形钢腹板工字钢组合连续梁的抗火设计提供参考。
To investigate the fire resistance of double-ribbed I-steel continuous composite girder with corrugated steel webs under different fire scenarios,a fire test of a continuous double-ribbed steel-concrete composite girder is taken as a background,and the finite element software ANSYS is used to establish a coupled thermal-force numerical model of the composite girder. The temperature rise law of the composite girder under fire,and the structural deformation and failure modes under different fire scenarios are analyzed. Furthermore,the influence of load ratio,span-to-height ratio,and the variation of the web corrugation angle on the fire resistance of the composite girder is studied. The results show that when subjected to fire,the temperature rise rate of double-ribbed I-steel continuous composite girder with corrugated steel webs along the height of the cross section is not consistent,forming a significant temperature gradient. The structural deformation and fire resistance time of the composite girder subjected to different fire scenarios have large differences,and the closer the fire area is to the middle support,the shorter the fire resistance time of the composite girder will be. The fire in the middle support area is a more unfavourable condition for the girder,with shorter fire resistance time and local buckling damage. Load ratio has a significant effect on the fire resistance of the composite girder subjected to fire at the side support area,and the fire resistance time decreases by 54.4% when the load ratio is increased from 0.3 to 0.5. Reducing the span-to-height ratio significantly improves the fire resistance of the girder subjected to fire in the side support and mid-span areas,but the fire resistance times of the girder subjected to different fire scenarios are relatively close. The variation of the web corrugation angle has a smaller impact on the fire resistance of the composite girder subjected to different fire scenarios,and the fire resistance times are close,which is basically negligible. The research results can provide a certain reference for the fire-resistant design of double-ribbed I-steel continuous composite girder with corrugated steel webs.
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国家自然科学基金(52068025)
江西省自然科学基金项目(20242BAB25309)
江西省交通运输厅项目(2024YB021)
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