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轻钢屋面自攻钉节点在台风作用下时变可靠度研究
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Research on Time-varying Reliability of Self-tapping Screw Joints of Light-weight Steel Roofs under Typhoon
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    摘要:

    为建立台风作用下自攻钉节点灾后性能评估办法,首先基于风洞试验的屋面时程风压系数数据,结合模拟台风的风速和风向信息,利用雨流分析法计算台风过境期间的屋面风压系数矩阵,进而用于不同风速下的节点抗力退化模型计算. 其次,结合台风荷载模型,采用蒙特卡罗模拟方法,获得沿海城市自攻钉节点的时变可靠度指标,从而实现基于概率的自攻钉节点抗风性能评估. 此外,根据模拟台风方法给出模拟台风的风速及风向的解析解,同时得到了台风致自攻钉节点抗力退化数学模型. 通过算例分析得出考虑自攻钉节点的台风致抗力退化会使其可靠度显著下降. 在对轻钢屋面自攻钉节点进行可靠度评估时,按照我国规范中的目标可靠指标较为保守.

    Abstract:

    In order to establish a post-disaster performance evaluation method for self-tapping screw joints under typhoon, firstly, the time-history wind pressure coefficient data of the roof based on wind tunnel tests were collected. Secondly, typhoon simulation was carried out to get information on wind speed and direction. Then, the coefficient matrix of roof wind pressure during typhoon transit was calculated by rain-flow analysis method. Finally, the node resistance degradation model under different wind speeds was calculated. Combined with the typhoon load model, the time-varying reliability index of self-tapping screw joints in coastal cities was obtained by the Monte Carlo simulation method. Thus, the wind resistance performance evaluation of self-tapping screw joints based on probability is realized. Besides, the analytical solutions of the wind speed and wind direction of the simulated typhoon are given according to the method of simulating typhoon. Simultaneously, the mathematical model of resistance degradation of self-tapping screw joints caused by the typhoon is obtained. Through the analysis of a numerical example, it is concluded that the reliability of self-tapping screw joints is significantly reduced when the typhoon induced resistance degradation is considered. When evaluating the reliability of self-tapping screw joints for light steel roofing, the target reliability indicators in China's codes are relatively conservative.

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杨娜?覮,刘威,白凡,葛瀚文.轻钢屋面自攻钉节点在台风作用下时变可靠度研究[J].湖南大学学报:自然科学版,2021,(11):72~81

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  • 在线发布日期: 2021-11-24
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