目前臺灣橋梁例行性檢測方式採用構件劣化評估方法(D.E.R.&U.) 目視檢測方法，優點為省時且執行容易，但缺點是檢測成果常因檢測人員不同，而有不一致現象，且僅能觀看到橋梁外部受損情形，無法評估橋梁因外力衝擊對內部性能損傷的影響，造成評估結果與儀器檢測有甚大差異。另外國內公路管理單位監測橋梁的普遍作法為直接量測法，利用安裝在橋梁墩柱之速度計，對橋梁作振動量測，其量測結果準確，可作為判斷橋梁是否安全之依據，然而台灣橋梁眾多，且多分佈於沿岸或高山縱谷間，全面安裝測量儀器費時且成本巨大，受限於預算限制，僅能針對少數重大橋梁進行監測，因此本研究擬發展快速間接量測與分析方法，藉由裝置在移動車輛上的速度計，量測擷取待測橋梁橋面板之振動頻率，進行橋梁安全評估：此方法具有移動性、迅速性、經濟性等優勢，以期解決目視檢測與直接量測法的問題。
為了決定橋梁振動頻率基準值，作為衡量判斷橋梁是否安全標準，本研究建立橋梁有限元素模型，進行耐震耐洪側推分析，推導求得橋梁損壞前後之頻率變化比值(Rec,Rsc)，此比值即可作為衡量評估橋梁健康之基準。
然而建立所有橋梁有限元素模型進行耐洪與耐震側推分析，其過程需大量時間與人力，不可能針對所有橋梁作逐一分析求得各橋梁Rec與Rsc值，本研究應用生物共生演算法結合最小平方差支持向量機(SOS-LSSVM)，推論求得其餘橋梁之Rec與Rsc，作為判斷各橋梁是否安全之振動頻率比值基準值，如此公路橋管單位即可藉由災害前後量測之橋梁振動頻率比值與基準值比較，衡量判斷橋梁封橋後能否開放通行之依據，在平時則可檢視橋梁健康度，作為橋梁維護之參考。

Bridge routine detection method is D.E.R. &U. visual inspection in Taiwan now. The advantage of D.E.R. &U. visual inspection is easy and time-saving, but the accuracy of result depends on the inspectors’ experience. Moreover, there is much difference between assessment and measurement of equipment because this method cannot be used to assess the influence on internal damage of pillar from the external attack. Bridge inspecting often use direct approach in Taiwan Highway Administration. With the direct approach, the dynamic properties of the bridge, such as frequencies and mode shapers, are obtained from the bridge response measured by the vibration sensors directly mounted on the bridge. There are many bridges in Taiwan, especially along the coast and between the valley. Installing the direct approach’s apparatus spends a lot of time and cost. This research develop indirect approach, which is advantageous over the direct approaches in terms of portability, convenience, and economics, due to the fact that it requires sensors being installed on the vehicle instead of on the bridge.
In order to determining the standard of bridge vibration frequency to know whether the bridge is safe or not, this research establish bridge models and do pushover analysis to speculate the variety of the bridge vibration frequency ratio(REC,RSC) from the process of pushover analysis. This ratio is a reference value to determine bridge health.
Establish all of bridge models and do pushover analysis to speculate the variety of the bridge vibration frequency ratio from the process of pushover analysis spends a lot of time and cost. This research applied Symbiotic Organisms search-Hybrid Least Squares Support Vector Machine(SOS-LSSVM) to the Rec and Rsc of other. The result can decide the ratio of vibration frequency for the bridge safe standard. Taiwan Highway Administration can use indirect approach to measure bridge frequency in ordinary and after disaster compute a ratio, compare with Rec or Rsc. To determine enclosed bridge can open or not. To View bridge health for reference of bridge maintains regularly.

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