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为研究独立梁下扣件式钢管支撑架的结构鲁棒性,结合失稳状态下结构的内力与变形特征,针对性地提出了基于变形控制的结构稳定临界承载力,并对已有的结构鲁棒性量化评价指标进行改进。通过4种支撑架设计模型的计算对比,分析了梁两侧外延立杆间距与水平杆加强层对结构鲁棒性的影响。结果表明:加载区立杆的构件易损性系数明显高于非加载区,而立杆的重要性系数却略低于非加载区;减小梁两侧外延立杆间距能有效提高结构鲁棒性;设置水平杆加强层在一定程度上提高了结构的稳定承载力,但降低了结构鲁棒性。
In order to study the structural robustness of the independent steel tubular buckle-type steel tube support, combined with the internal forces and deformation characteristics of the structure under instability, the critical stability of the structure based on deformation control is proposed in a targeted manner. Robust quantitative evaluation index to be improved. Through the comparison and calculation of the four support frame design models, the influence of the distance between the extension poles on both sides of the beam and the reinforcement of the horizontal bar on the structural robustness is analyzed. The results show that the vulnerability coefficient of the pole in the loading area is obviously higher than that in the non-loading area, while the importance coefficient of the pole is slightly lower than that in the non-loading area. Reducing the spacing between the poles on both sides of the beam can effectively improve the structural robustness. Setting the horizontal reinforcement layer to a certain extent, improve the stability of the structure bearing capacity, but reduces the structural robustness.