1. Base-isolation design of single-tower cable-stayed bridges: a case study in meizoseismal area
- Author
-
Bin Yan and Ye Xia
- Subjects
Pier ,lcsh:Mechanical engineering and machinery ,0211 other engineering and technologies ,020101 civil engineering ,02 engineering and technology ,Bridge (interpersonal) ,single-tower cable-stayed bridge ,0201 civil engineering ,Seismic analysis ,lcsh:TJ1-1570 ,General Materials Science ,liquid viscous dampers ,021110 strategic, defence & security studies ,elastomeric bearings ,business.industry ,Mechanical Engineering ,Numerical analysis ,seismic design ,Seismic loading ,Structural engineering ,base-isolation ,Cable stayed ,Base isolation ,business ,Tower ,Geology - Abstract
The single-tower cable-stayed bridge is one of the most popular types of bridges. Seismic design for this type of bridge, however, is rather difficult. When subjected to longitudinal earthquakes, the tower stands as the weakest part of all the bridge components. To solve this problem, a base-isolation design was developed and adopted for a practical single-tower cable-stayed bridge. In this design, laminated elastomeric bearings (EB) and liquid viscous dampers (LVD) were installed to serve as a base-isolation layer inside the tower cap. Numerical analysis was then conducted to investigate the variations of dynamic characteristics and seismic responses between conventional designs and base-isolation designs. LVD were used on the top of the transition pier to optimize the seismic system of the bridge. It was found that: i) the seismic loads acting on the bridge component were reduced as the seismic displacements increased. This was the result of amplification of the bridge vibration period by the EB in the base-isolation layer; ii) the seismic displacements were restrained by the LVD in the base-isolation layer, but the seismic forces increased due to improper parameter values; and iii) the seismic response decreased further by the transition pier’s LVD.
- Published
- 2018