考虑腐蚀作用的钢框架结构连续性倒塌分析
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作者:
作者单位:

1.西安建筑科技大学土木工程学院;2.西安建筑科技大学国家级土木工程虚拟仿真实验教学中心;3.西安建筑科技大学安德学院;4.西安建筑科技大学资源工程学院

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中图分类号:

TU391 TU501

基金项目:

陕西省自然科学基金(面上项目),国家自然科学基金项目(面上项目)


Progressive collapse analysis of steel frame structures with corrosion effect
Author:
Affiliation:

1.School of Civil Engineering,Xi’an University of Architecture Technology;2.National Experimental Teaching Center for Civil Engineering Virtual Simulation (XAUAT);3.School of Ande,Xi’an University of Architecture Technology;4.School of Resources Engineering,Xi'an University of Architecture Technology

Fund Project:

Natural Science Foundation of Shaanxi; National Natural Science Foundation of China

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    摘要:

    为研究环境侵蚀作用下钢框架的连续性倒塌行为,建立了钢结构腐蚀模型以预测构件截面面积和力学性能随服役时间的退化情况,以一栋处于Ⅲ级大气腐蚀环境中的多层钢框架为研究对象,在寿命周期内不同阶段对其进行Pushdown分析。结果表明:腐蚀会导致钢框架的承载力和延性发生退化,其中延性的劣化更明显。通过灵敏度分析得到不同材料参数对结构抗连续性倒塌指标的影响,其中承载力指标的退化主要归因于材料强度的降低和构件截面面积的减少,断裂应变的退化则直接导致延性指标下降。最后,基于回归分析得到结构抗倒塌指标随体积损失率的退化规律。

    Abstract:

    In order to study the progressive collapse behavior of steel frame structures under the action of environmental erosion, a steel corrosion model was developed to predict the changes of the cross-sectional area and mechanical properties of the members with their service time. A multi-story steel frame structure in a Class III atmospheric corrosion environment is studied and the Pushdown analysis is performed at different stages of its full life cycle. The results show that corrosion causes degradation of the bearing capacity and ductility of steel frames, especially on ductility degradation. The influences of different material parameters on the resistance index against progressive collapse are obtained by sensitivity analysis. The degradation of bearing capacity is mainly attributed to the reduction of material strength and cross-sectional area of the members. The decrease of ductility index is attributed to the degradation of steel elongation. Finally, the variation rules of resistance index with volume loss rate are obtained based on regression analysis.

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  • 收稿日期:2021-12-29
  • 最后修改日期:2022-04-24
  • 录用日期:2022-05-19
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