## 3 NELCS of a Typhoon  
During the typhoon field measurement process, the external pressures on the roof of the moveable instrumented building are monitored by using the wind pressure transducers, and the 3D wind velocity information provided by anemometers. Typhoon Chanthu (201003) was generated in the sea area about 900 km south-southeast of Hong Kong on 19 July 2010 and moved northwest. On 20 July, Chanthu intensified into a tropical storm and moved westwards for a while during that night. Chanthu intensified into a severe tropical storm on 21 July. Then, Chanthu resumed a northwesterly track and intensified into a typhoon. At 13:45 on 22 July, Chanthu landed near Wuchuan City, Guangdong Province, and weakened into a severe tropical storm. The moveable instrumented building was located on the seashore near Diancheng Town, Wuchuan City, at latitude 20\({}^{\circ}\)40\({}^{\prime}\) N and longitude 111\({}^{\circ}\)30\({}^{\prime}\) E. The instrumented building is 6 m \(\times\) 4 m \(\times\) 4 m. A drainage gradient of 2% was set on the flat roof. Wind pressure transducers were installed on the roof of the instrumented building. A 10-meter meteorological tower was located 7 m away from the building. Three RM young anemometers were mounted on the tower at heights of 4, 7.5, and 10 m from the ground. Moreover, a Wind Master Pro 3D ultrasonic anemometer (UK Gill Instruments, Lymington, UK) was installed at a height of 10 m on the tower. The locations of pressure taps on the roof of the building are shown in Figure 3[30]. The ultrasonic anemometer measurement at the height of 10 m shows that the maximum 3-second gust wind speed of typhoon Chanthu was 41.4 m/s, and the maximum 10-minute mean wind speed was 30.3 m/s. Tap12 located at the windward leading edge on the corner was consistently subjected to the most severe suction pressures for quartering winds; the peak suction pressure recorded during the typhoon was \(-\)4.24 kPa. The pressures during the strongest storm from 8:00 to 13:00 are shown in Figure 4.  
The pressure records were counted and analyzed by using the rainflow method. Each cycle in the pressure record was sorted according to its mean value and range. The pressure ranges and mean values were simplified and divided into 10 levels to form a 10 \(\times\) 10 matrix. The number of cycles of each cell was counted, as shown in Figure 5. The matrix is composed of the cycles of the combinations of different wind pressure range cells  
After the rainfw statistics and simplification division, the wind loading matrix is still complex and is not acceptable for use in an engineering test. Accordingly, the matrix still needs to be further simplified. [PERSON] [11] researched the fatigue behavior of metal roof claddings and pointed out that the maximum load and the range have a more significant influence on the fatigue performance of metal roof claddings than the mean value. Twenty-four non-zero loading cells represent the pressure records during the typhoon in Figure 5. The ratio of the average maximum load of each cell to the peak suction pressure during the typhoon is defined as the load ratio, and the corresponding cycle times are counted according to the load ratio of each cell. Then, the 24 non-zero cells were further simplified into a four-level loading sequence with a zero minimum load and a maximum load of 0.4, 0.6, 0.8, and 1.0 times the ultimate design load. All the cells of loading in Figure 5 with a load ratio of between 0 and 0.4 were allocated to the four-level loading sequence with a load ratio of 0-0.4. The loading cells with a load ratio of between 0.4 and 0.6 were allocated to the loading sequence with a load ratio of 0-0.6. Meanwhile, the loading cells with a load ratio of between 0.6 and 0.8 were allocated to the loading sequence with a load ratio of 0-0.8. Furthermore, the loading cells with a load ratio of between 0.8 and 1.0 were allocated to the loading sequence with a load ratio of 0-1.0.