台灣位於環太平洋地震帶上，地震是工程上的一大挑戰。中低樓層鋼筋混凝土造住商混合住宅是台灣常見的建築形式，大多會將底層作為通透度較高之寬敞空間使用，使剛度較鄰層弱甚至形成軟弱底層。為了使結構能保有原有空間使用性並且提升耐震能力，採用隔震工法是一個較為可行的方式，但傳統隔震系統造價較高，數量上佔大多數的一半中低樓層建築難以負擔，因此本研究探討使用成本較低之滑動式基礎耐震性能。滑動式基礎可藉由控制摩擦係數，使在中小度地震以結構本身性能抵抗地震，在大型地震中發生滑動避免結構嚴重損傷。以往實驗中有將鑄鐵與砂漿作為滑動基礎的界面材料，並且證實滑動式基礎能有效提升結構耐震能力。本研究以此為基礎探討採用不同種類砂漿以及滑動式基礎之結構物在降低摩擦係數後對於上部結構的影響。
研究先以靜態摩擦實驗來測試如何控制摩擦係數並選定一種合適的砂漿作為振動台實驗所用，爾後以振動台實驗測試降低摩擦係數後對於上部結構之耐震性能以及動態行為之影響。
靜態摩擦實驗設計了六種不同抗壓強度與細度模數之砂漿與鑄鐵(FC250)進行摩擦實驗。從這六種組合中發現，提升砂漿抗壓強度有降低摩擦係數之趨勢，改變細度模數也稍微有降低摩擦係數之趨勢，但影響程度不及改變抗壓強度明顯，最終選定抗壓強度為400 kgf/cm2、細度模數為2.2、μs=0.21、μk=0.17之砂漿作為振動台實驗所用。
振動台實驗重點結論如下：
1.經多次摩擦後，摩擦係數有逐漸升高之趨勢，可能與摩擦表面損傷有關。
2.振動台實驗測出之摩擦係數約為0.3，相較於2018年實驗之0.4，本次實驗之摩擦係數較低，在50%加載強度中滑移量相較於2018實驗增加了約3倍，在100%加載強度中無明顯差異。
3.在二維輸入波(僅水平兩向加載)之加載歷程中依然有擺動之行為產生，整體動態行為與結構反應和三維輸入波十分接近。
4.測得加速度峰值與樓板相對變位峰值均以擺動所主導，又擺動可能與共振有關，導致本次實驗與2018年實驗無明顯差異。觀察未發生擺動且加載強度最大的時刻點，增強加載強度有降低更多上部結構加速度的趨勢；觀察樓板相對變形也可發現提升加載強度對於樓板相對變形並無明顯影響。從以上幾點均顯示滑動式基礎在未發生擺動的情況中有非常顯著之效果。

This research conducted an experimental study to evaluate the seismic performence of the structure with sliding base system. Various contents of the mortars were adopted to exam the effects on friction coefficient. The sliding base system adopts cast-iron and mortar at the interface. The static friction test showed that increased the compressive strength of mortar tended to decrease the friction coefficient, also decreasing the fineness modulus has the same tendency but it’s not as obvious as increasing compressive strength. In addition, one of the mortar specimen, whose compressive strength was 400 kgf/cm2 ,fineness modulus was 2.2,exhibited the static friction coefficient of about 0.21 and the kinetic friction coefficient of about 0.17. The specimen was selected for the shaking table experiment.
Shaking table experiments indicated that the dynamic friction coefficient was approximated 0.3. Even though the dynamic friction reduced from 0.4 to 0.3, collisions still occurred and broke the surface of mortar. In this condition, most structural responses were similar to the previous experiment which adopted the sliding base system with higher friction coefficient, only the sliding distance increased about 3 times in the 50% input intensity. Furthermore, the measured acceleration peak and floors relative displacement peak were both are the seismic performance indicators which dominated by collisions, and the collisions may be related to resonance of the structure and the input wave, result in there was no significant difference between this experiment and previous experiment.

中央氣象局 地震測報中心，『臺灣的地震頻率如何?』：https://scweb.cwb.gov.tw/zh-TW/Guidance/FAQdetail/55，臺灣。(最後瀏覽：2020年7月1日)
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