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中文摘要：
从随机极值理论和工程实际应用2个方面入手，对峰值因子的取值问题进行探讨。首先，介绍了与峰值因子相关的计算理论；然后，对我国荷载规范和国外荷载规范的相关规定进行比较；最后，结合一大跨屋盖结构算例，探讨在屋盖结构风振分析中的峰值因子确定问题。该算例的分析结果表明：当采用我国荷载规范规定的峰值因子取值来计算屋盖结构的风振响应时，其结果可能是偏于不安全的。建议该类结构的峰值因子取值为400～500。
英文摘要：
The value of the peak factor was discussed with the crossing theory and reliability theory. Then Chinese code and foreign codes about the prescript of the peak factor was compared. Moreover, utilizing the theory mentioned above, the value of the peak factor about the wind - induced vibration of roof structure was obtained, The results show that the prescript of peak factor in Chinese code is probably unsafe for the wind - resistant design. And it is suggested that the value of the peak factor is 4.0 - 5.0 for the roof structure.
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