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桁架式轻钢结构抗震性能研究

Seismic behavior of truss-type light steel structure

  • 摘要: 为研究连续桁架对桁架式冷弯薄壁型钢结构抗震性能的影响,在考虑桁架位置、数量及试件结构形式的情况下,设计并制作了2榀足尺骨架模型,通过低周往复加载试验,分析了骨架模型的滞回性能、刚度退化、承载力退化和耗能性能。结果表明:连续桁架结构对改善骨架模型的连续性和整体性具有良好的效果,开洞模型左右两侧设置的连续桁架结构承受较大的水平荷载并与其他构件协调变形,较中间设置一榀桁架的非开洞模型承载力提高了3.4%,相同位移下累计耗能提高了27.5%,说明连续桁架结构可提高试件的承载力和耗能性能;有限元数值分析结果表明桁架截面面积从13.2 cm2增长到31.2 cm2时,结构模型的承载力提高了157.37%,抗侧刚度提高了157.89%,增加桁架截面面积可有效提高结构模型的抗震性能。

     

    Abstract: In order to study the effects of the continuous truss on the shock resistance performance of the truss-type cold-curved thin-walled steel structure, in the report, the truss position, quantity and test parts were taken into account, a two-foot-foot skeleton model was designed and constructed, the low-frequency cyclic loading test was performed to analyze the hysteretic behavior, stiffness degradation, bearing capacity deterioration, and energy consumption. The results indicated that the continuous truss structure had a good effect on improving the continuity and integrity of the skeleton model. The continuous truss structure set on the left and right sides of the opening model withstood the large horizontal loads and coordinated the deformation with the other components. Compared with the intermediate settings, the bearing capacity of the non-cave model increased by 3.4%, and the cumulative energy consumption under the same displacement condition increased by 27.5%, which suggested that the continuous truss structure can improve the bearing capacity and energy consumption performance of the test parts. The numerical analysis data of the finite element method demonstrated that when the area of the truss cross section increased from 13.2 cm2 to 31.2 cm2, the carrying capacity increased by 157.37%, the anti-side stiffness increased by 157.89%. Increasing the area of the truss cross section can effectively improve the seismic performance of the structural model.

     

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