荷载分项系数调整对轻钢结构构件可靠性和材料用量的影响分析

Reliability analysis of light steel structure after adjustment of load partial coefficient

轻钢结构对可变荷载极度敏感,设计时其荷载分项系数取值相对偏小。《建筑结构可靠性设计统一标准》(GB 50068-2018)中调整后的荷载分项系数数值有所提高。为了明确荷载分项系数调整前后轻钢结构可靠性和材料用量的变化,通过收集不同轻钢构件的分布类型和统计参数,考虑更符合轻钢结构的荷载效应比?为0.25~12,并基于可靠度理论对轻钢结构的可靠度和材料用量进行了分析。分析结果表明:荷载分项系数调整后,轻钢结构可靠指标提高范围为8.1%~11.2%;材料用量增加了4.28%~5.41%。这些定量的分析结果可为结构工程师提供参考。

Light steel structure is extremely sensitive to variable loads, and its partial load coefficient is relatively small. The values of load partial coefficient are increased in〈Unified standard for reliability design of building structures(GB50068-2018)〉. In order to clarify the changes of the reliability and material consumption of light steel structures before and after the adjustment of the load partial coefficient, the reliability and material consumption of light steel structures are analyzed based on the reliability theory by collecting the distribution types and statistical parameters of different types of light steel members and considering that the load effect ratio ?(0.25~12) which is more in line with light steel structures. The results show that the increase range of reliability index of light steel structure is 8.1%~11.2%. The material consumption increases by 4.3%~5.4%. All the quantitative analysis provides a reference for structural engineers.