###### Abstract  
Equivalent load cycle sequence (ELCS) is important basic information to know that affects the reliability of the evaluation of wind-induced fatigue on metal roof claddings. In this study, an estimation method of wind-induced fatigue of metal roof claddings is proposed. Based on the measured wind pressure-time history data of the roof claddings on a full-scale low-rise building located along the coast of South China during a typhoon, a new ELCS (NELCS) that reflects typhoon and actual structure wind pressure characteristics in China's coastal areas is obtained by using the rainflow counting method. The locations of fatigue hot spots of metal roof panels are analyzed by using the finite element analysis method, and the relationship between hot spot stress and wind pressure is obtained. The fatigue damage accumulation of metal roof claddings under the EICS of a typhoon process is counted by the linear cumulative fatigue theory, commonly known as Miner's rule. The fatigue damage accumulation of roof claddings with different purin distances and design wind loads is analyzed using this method and then compared with the results from the dynamic loading test of an air chamber. Results show that the physical test findings are close to the numerical calculation results, which proves that the numerical calculation method has high accuracy and reliability. The comparison between NELCS in this study and the Australian standard low-high-low (LHL) sequence shows that the LHL loading sequence is conservative. roof claddings; wind-induced fatigue; equivalent load cycle sequence; numerical analysis; wind-resistance fatigue test +
Footnote †: journal: Medical Imaging  
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that the annual incidence of category 4 and category 5 typhoons has more than doubled. [PERSON] et al. [5] found that the tropical cyclones that make landfall in China have become more destructive in recent decades. Typhoon No. 22 Muijgae landed in Zhanjiang in 2015, causing serious damage to space-enclosing structures of several of Baosteel's projects that were under construction, in addition to the roofs of several venues of Zhanjiang Olympic Sports Center (Figure 1a). Typhoon Meranti landed in Xiamen in 2016, causing serious damage to the Xiamen hangar (Figure 1b). In 2017, Typhoon No. 13 Hato landed in Zhuhai and destroyed a large number of metal roofs (Figure 1c). The analysis and detection of anti-fatigue effects of metal roof claddings under fluctuating wind load of typhoons are important factors in the wind-resistance design of long-span metal roof systems. Typhoon equivalent load cycle sequence (ELCS) is important basic information required for the wind-induced fatigue evaluation of metal roof claddings. Tropical cyclone Tracy destroyed a great number of roof claddings in 1974. Therefore, it is necessary to develop a typhoon equivalent loading sequence in order to verify the fatigue strength of roof claddings. The standard fatigue test sequence of DABM [6] adopts 10,000 cycles with the design wind load as the standard amplitude. However, the constant amplitude cycle of this sequence does not reflect the wind load distribution characteristics of tropical cyclones. Melbourne [7] defines the ELCS according to the hourly mean pressure and the rms of the pressure fluctuations, which is equivalent to the 1-hour random wind load under the maximum design wind speed in the 50-year return period. The equivalent load sequence of 5000 cycles per hour is recommended to be repeated three times in order to simulate the load of tropical cyclones. [PERSON] et al.