Performance Analysis of Frictional Connection Block for Vibration Mitigation Project in Tainan Science Park
Date Issued
2009
Date
2009
Author(s)
Wang, Chun-Kai
Abstract
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.
Subjects
high speed rail
vibration mitigation project
frictional connection block
bolt analysis
finite element analysis
Type
thesis
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