高鐵行車引致台南科學園區地盤等振度圖模擬及高科技廠房結構試驗與分析二

Abstract

興建中之台灣高速鐵路路線將穿越台 南科學園區，高鐵列車高速行駛所引起之 振動能量，傳遞進入園區地盤，經初步評 估園區內部分區域之素地振動值超出高科 技廠房之基地設置標準，變成國科會亟待 解決之問題。 由於一般高科技廠房在結構設計上採 用比傳統結構規格要高許多的防震設計， 也因此高科技廠房結構對於素地振動值將 會有相當程度之修飾作用，如果園區內素 地振動值與高科技廠房內生產樓層地板振 動值之轉換關係沒有進一步釐清，則園區 內高科技廠房生產受高鐵行車振動之影響 便缺乏可靠的評估。 本計劃將延續【高鐵行經南科園區引 致振動分析】計劃，對高鐵行車所引致園 區地盤振動與高科技廠房結構之振動，做 一全面的分析與試驗。數值模擬分析方面 屬於計畫(一)的部份，此一分析將涵蓋台 南科學園區距離高鐵路線800 米內的地 盤，台灣高速鐵路穿越園區路段之不同高 架橋結構型式將全部納入數值模型中，尤 其是高速鐵路鋼軌所引致高架橋相鄰跨間 的互制作用也將做最接近現況的模擬，完 成在關鍵低頻範圍（2∼12.5 Hz）之全園 區素地等振度圖模擬，以及高科技廠房之 數值模擬震動分析。 對於計劃(二)的部分則為現地振動試 驗與分析。現地試驗部分為利用南部科學 園區之晶圓廠房實體結構進行廠房結構微 動量測、重型卡車行車振動試驗、強迫振 動試驗，藉以評估晶圓廠房實體結構之振 動特性及其受各種震源作用之振動情形及 減震效應，作為晶圓廠房結構設計及設置 減震措施之參考。

The constructed Taiwan High Speed Rail (THSR) passes through the Tainan Science-based Industry Park (TSIP). According to the analytical predictions made by the ICEC and NCREE, the ground vibrations induced by the future operation of the THSR will exceed the vibration criteria of the high-tech fabs inside the TSIP. Therefore, the vibration problem becomes a very important issue for the development of the TSIP. The structure of the fab is usually very huge and stiff. When the vibrations propagate from the ground into the fab, the foundation and structure has the effects to modify the amplitude as well as the phase of the vibrations. In order to accurate predict the influence of the ground vibrations to the production floor, it has to clarify the effects of modification by the foundation and structure. In order to solve this problem, two parallel projects are conducted, the numerical analysis and the in-situ vibration test. The former, called Project I, is aimed to predict the ground vibrations induced by the THSR and to do the soil-structure analysis for the fab and the foundation soils. The latter, called Project II, is to conduct the in-situ vibrational tests to measure the vibratonal characteristics of the fab structurethe and the ground, as well as the decay of vibrations from the ground to the structure. This project is the Project II. The in-situ tests were conducted at a Fab inside the TSIP. The tests include the ambient measurements, the traffic-induced vibration tests and the shaker-induced vibration tests. Test results obtained can be used to deduce the dynamic characteristics of the fab structure, and the decay of vibrations from the ground into the structure. Those information are the key issue to accurately assess the vibration of the fab influenced by external excitation sources, and can be used for the design of the vibration reduction countermeasures.