孟宝, 钟炜辉, 郝际平. 不同跨度比下栓焊刚性连接梁柱子结构抗倒塌性能试验研究[J]. 工程力学, 2018, 35(1): 79-87. DOI: 10.6052/j.issn.1000-4750.2016.09.0672
引用本文: 孟宝, 钟炜辉, 郝际平. 不同跨度比下栓焊刚性连接梁柱子结构抗倒塌性能试验研究[J]. 工程力学, 2018, 35(1): 79-87. DOI: 10.6052/j.issn.1000-4750.2016.09.0672
MENG Bao, ZHONG Wei-hui, HAO Ji-ping. EXPERIMENTAL STUDY ON ANTI-COLLAPSE PERFORMANCE FOR BEAM-COLUMN ASSEMBLIES WITH BOLT AND WELD RIGID CONNECTION BASED ON DIFFERENT SPAN RATIO[J]. Engineering Mechanics, 2018, 35(1): 79-87. DOI: 10.6052/j.issn.1000-4750.2016.09.0672
Citation: MENG Bao, ZHONG Wei-hui, HAO Ji-ping. EXPERIMENTAL STUDY ON ANTI-COLLAPSE PERFORMANCE FOR BEAM-COLUMN ASSEMBLIES WITH BOLT AND WELD RIGID CONNECTION BASED ON DIFFERENT SPAN RATIO[J]. Engineering Mechanics, 2018, 35(1): 79-87. DOI: 10.6052/j.issn.1000-4750.2016.09.0672

不同跨度比下栓焊刚性连接梁柱子结构抗倒塌性能试验研究

EXPERIMENTAL STUDY ON ANTI-COLLAPSE PERFORMANCE FOR BEAM-COLUMN ASSEMBLIES WITH BOLT AND WELD RIGID CONNECTION BASED ON DIFFERENT SPAN RATIO

  • 摘要: 以钢框架中3个不同跨度比(1∶0.6、1∶1.0、1∶1.4)的栓焊刚性连接梁柱子结构(两跨三柱型)为研究对象,通过单调静力加载试验研究了连续倒塌条件下梁柱子结构的破坏模式、力学形态和抗力机理。试验结果表明,试件表现出多次、间断性破坏特征,先是失效柱与梁受拉翼缘连接处断裂,进而因跨度比不同有所差异:等跨试件边柱梁柱节点处梁端受拉翼缘发生断裂;不等跨试件短梁受拉翼缘与边柱连接附近处发生断裂,短梁先于长梁失效。3个试件的变形形态相似,其抗力机制发展过程可划分为梁机制阶段、梁受弯向受拉转化的过渡阶段和悬链线机制阶段。试件的多次局部破坏使其呈现出多个荷载峰值点,在梁机制阶段荷载随跨度比增大而减小,之后等跨试件因上下梁的协同工作可提供高于梁机制阶段的承载力,而不等跨试件由于短梁先于长梁失效而长梁的悬链线效应未能充分发挥,荷载峰值依次降低,即等跨结构较非等跨结构在大变形时具有更好的传力机制,有利于提高结构的抗倒塌承载力。

     

    Abstract: Three steel beam-column assemblies with different span ratio (1:0.6, 1:1.0, 1:1.4), which were comprised of three columns and two beams with the bolt and weld rigid connection, are studied. Through static loading tests, the failure mode, mechanical behavior and resistance mechanism under the condition of progressive collapse are studied. The test results indicate that the specimens show failure characteristics of multiple and intermittent damage. It is initiated by the fracture of beam tension flange near the middle column and then appears discrepancy due to the different span ratio. For the specimen with equal spans, beam tension flanges near side column fracture; for specimens with unequal spans, damage occurs to the tension flange of short beam fractures near corresponding side column and the short beam before long beam. The deformation modes of three specimens are similar, and the process of anti-collapse mechanism undergoes the flexural action phase, flexural and catenary action transition phase and catenary action phase, successively. The specimens present multiple load peak points because of a number of local damage. The load decreases with the span ratio increasing in the flexural action phase. And then the specimen with equal spans could provide higher resistance due to the working together of upper and bottom beams, while the peak points of the bearing capacity of the specimens with unequal spans decrease with the loading displacement increasing because short beam fails before long beam without giving full play to catenary action. This shows that the assembly with equal spans has better transfer mechanism and is relatively beneficial to improving the anti-collapse bearing capability of the structure under large deformation.

     

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