国产高强度结构钢设计指标和可靠度分析

发布时间：2018-04-15 08:26

本文选题：高强度结构钢 + 可靠度分析　；参考：《建筑结构学报》2016年11期

【摘要】：我国现行钢结构设计规范中已列入Q460钢的设计指标,为了补充更高强度等级钢材,包括Q500、Q550、Q620和Q690钢的设计指标,供工程设计人员参考,收集国产高强度结构钢材的材性统计数据,借鉴已有高强钢轴压、压弯、受弯构件计算模式不定性研究成果,进行了试验影响因素不定性试验研究,得到了高强钢材料性能试验影响不定性的统计参数。对高强钢材料性能不定性、几何参数不定性和计算模式不定性进行综合研究,计算得到高强钢抗力不定性的统计参数。利用验算点法,计算高强钢在不同荷载组合下的抗力分项系数,并分析了其变化规律。经过比较试算,提出了适用于不同情况下的高强钢抗力分项系数和设计强度建议值。最后对上述设计指标进行了可靠度校核,结果表明,采用文中提出的高强钢设计指标满足GB/T 50153—2008《工程结构可靠性设计统一标准》的要求,具有一定的可靠性。
[Abstract]:The design index in Q460 steel has been China's current code for design of steel structures, in order to supplement the higher strength grade steel, including Q500, Q550, Q620 and Q690 steel design index, a reference for engineers, material collecting statistical data of domestic high strength steel, high strength steel from the axial compression, bending. The uncertainty of calculation model research results of flexural members, studied the effect factors of qualitative study, statistical parameters influence the high strength performance of steel materials testing is not qualitative. For the high strength performance of steel material is qualitative, not comprehensive study of geometric parameters and model uncertainty, statistical parameters of high strength steel resistance uncertainty the calculation. Using the checking point method, resistance coefficient calculation of high strength steel under different loads combination, and the changes were analyzed. After comparison calculation is put forward for different conditions of high Strong steel resistance coefficients and the design strength of the recommended value. Finally the design index of reliability assessment, the results show that the high strength steel design indices proposed in this paper to meet the GB/T 50153 - 2008< engineering structural reliability design standard > requirements, has certain reliability.

【作者单位】：清华大学土木工程安全与耐久教育部重点实验室;清华大学土木工程系;华东建筑设计研究院有限公司;
【基金】：国家自然科学基金项目(51478244)
【分类号】：TU391

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