台南科學園區減振工程減振連接器固鎖性能分析

Abstract

南部科學園區因台灣地狹人稠，被迫選址於緊鄰高速鐵路通過路線上的台南縣新市鄉，為解決高鐵振動造成南科園區內廠房振動之問題，國科會於南科園區內採用基礎加勁構造減振及彈性減振牆減振並行的復合工法。基礎加勁將橋墩基礎連接，將點振源轉為線振源，以降低振動峰值。考慮高架橋在地震時的結構安全，在橋墩與基礎加勁塊間設摩擦連接器，分別在高架橋柱基礎與基礎加勁塊安置連接器本體，以螺栓連接連接器本體與連接板，利用摩擦力由連接板連接連接器本體，連接橋柱基礎與基礎加勁塊，本文針對摩擦連接器固鎖性能進行研究。 首先利用估算法，估算減振器本體與連接板固鎖M33螺栓及減振器本體與基礎板固鎖M39螺栓之軸向力、縱向抗滑阻力、抗剪強度及溫度對連接板與減振器本體縱向滑動之影響，並由試驗結果檢討抗滑阻力及預緊扭矩。 使用ANSYS軟體建立螺栓及摩擦連接器有限元素模型並進行數值模擬分析，模擬螺栓固鎖時螺牙受力情況之應力分佈，並使用摩擦連接器模型模擬連接器受M33螺栓固鎖能發揮之連結力及溫度改變對連接器滑動之狀況。

Due to highly population density in west of Taiwan, Tainan Science Park (TSP) are compelled to be adjacent at Hsin-Shih, Tainan county. In order to reduce the ground vibration caused by passing trains impacting the vibration-sensitive factories in the TSP, National Science Council adopted the Hybrid Vibration Mitigation System (HVMS) include the foundation stiffening block (FSB), and the elastic base wall (EBW) . The FSB was installed between the pile caps of viaducts to integrate the discrete viaduct bases into a continuous solid foundation. Ordinarily, the point vibration source from pier impacted by passing trains will be redistributed into line source with smaller amplitude.The FSB may be disconnected from pile foundations while strong earthquake occurs insuring the viaduct structure complete. Therefore the Frictional Connection Block (FCB) was installed consists of two main webs and connection blocks. One web is bolted on pile cap, the other is on FSB. Both webs are connected by two connection blocks through frictional force induced by screw bolts. This thesis focus on connection efficiency of frictional force of FCB generated by the preload of screw bolts. Firstly, we estimated the axial force, longitudinal resist slide force, resist shear magnitude, and the temperature variation effect to the FCB of the bolt M33 (screwing main web and connection block), the bolt M39 (screwing the FCB and FSB). Furthermore, we evaluate the resist slide force and pre-torque with experiment. Secondly , we build finite element models for stress analysis of the bolts and the FCB. Then the stress distribution on blot thread under pre-load or pre-torque conditions were analysed. Finally we evaluated the FCB friction force induced by screw bolts and investigated the temperature variation effect on the connection status of FCB.