高级检索+

荷载分项系数调整对结构构件承载力评定分级标准的影响

Influence of Bearing Capacity Grading Standard of Structural Members after Adjustment of Load Partial Coefficient

  • 摘要: 荷载分项系数取值直接关系到结构构件的可靠性,为研究其调整对结构构件承载能力评定分级标准的影响,通过计算14种具有代表性的结构构件的抗力分项系数,考虑永久荷载与办公室楼面活荷载、永久荷载与住宅楼面活荷载、永久荷载与风荷载、永久荷载与雪荷载四种简单组合和常用的活恒荷载效应比,基于荷载、抗力的统计特性,进行荷载分项系数调整前后结构构件的可靠性分析,提出荷载分项系数调整后结构构件承载能力评定等级的分级标准。结果表明:《民用建筑可靠性鉴定标准》(GB 50292—2015)中对各安全等级下结构构件的安全性分级偏于保守,提出的可靠指标分级标准能更合理反映新标准对结构构件可靠度控制水平,可为国家标准的修订提供参考。

     

    Abstract: The value of load partial coefficient is directly related to the reliability of structural members. In order to analyze the influence of grading standard of bearing capacity for structural members after adjustment of load partial coefficient, 14 representative structural members were selected to calculate their partial factors of resistance. Considering three simple combinations of dead load and floor live load(office), dead load and floor live load(dwelling), dead load and snow load, dead load and wind load and common load effect ratios, the reliability analysis of each member are developed. Then the grading standard of load capacity evaluation of structural members after adjustment of load partial coefficient is proposed. The results show that the safety classification of structural components under different safety levels in(GB 50292—2015) is conservative. The reliability index classification standard proposed in this paper can more reasonably reflect the control level of the new standard on the reliability of structural components, and can provide a reference for the revision of the national standard.

     

/

返回文章
返回