綠屋頂建物之短期健康監測－以新北市樹林生命紀念館B館為例

為降低都市熱島效應對市區環境影響，近年來都市建築物設置綠屋頂日漸普及，為研究屋頂綠化覆土對於建物耐震力的影響，本研究利用新北市樹林生命紀念館B棟作為實驗對象，在2021年3月份結構體完成後、屋頂尚未覆土時在頂版與B1F安裝3具地震儀並監測四個月，蒐集覆土前、後八次地震紀錄進行比較；該棟大樓屋頂覆土深度約40公分、綠化面積約為208.5 m^2，總重約150噸，佔該結構物總重之5%，經對照比較，短邊方向在小地震時，振動頻率大約由6.5 Hz減少至5.9 Hz，而長邊的頻率可清楚識別由6.5 Hz衰減為6 Hz，故建議舊有建物實施屋頂綠化時應先進行耐震分析，以確保結構安全。

關鍵字

系統識別；地震反應；綠屋頂；健康監測；建物週期

並列摘要

To measure the affected level of vibration frequencies for a green roof building, Shulin Columbarium Pagoda, a 3-story public building with a 40 cm soil layer on the roof, is chosen to be investigated by short-term health monitoring. Three tri-axial seismometers had been set up 3 months before the soil was piled up on the roof, and then the test still kept continuing for another 1 month after the green roof had been done. The total weight of soil layer is about 150 tons, accounting for 15% of the roof slab weight. According to the identified results from collected earthquake records, the natural frequency in short-side direction approximately decreased from 6.5 Hz to 5.9 Hz, while the frequency in long-side direction was well identified decreasing from 6.5 Hz to 6 Hz. It can be concluded that 15% extra mass of original roof slab causes the obvious drop of vibration period. Therefore, while a green roof project was applied in old buildings, the earthquake resistance design should be rechecked by the engineer to assure the safety of the building.

並列關鍵字

system identification ； green roof ； health monitoring ； seismic response

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