ISOLATION PERFORMANCE STUDY OF THE HONG KONG–ZHUHAI–MACAO BRIDGE ENGINEERING
Abstract
This paper investigates the isolation performances of bid DB02 section of the Hong Kong–Zhuhai–Macao Bridge. The navigable cable-stayed bridge and the non-navigable steel-concrete continuous girder bridge in the high-pier and low-pier regions are taken as an illustration. The finite element models with aseismatic bearings and isolated bearings are established and the seismic time-history analysis under the earthquake levels of P2 and P3 are carried out. The nonlinear properties of LRB, HDR, and FPB isolated bearings and the pile-soil interaction are simulated using bilinear spring elements and layered Winkler soil springs model, respectively. The results show that the bridge structure with isolated bearings is more flexible by extending vibration period. The dissipated hysteric energy can effectively reduce the earthquake energy and the response of the structure. Subject to the earthquake level P3, most piers of the bridge are in elastic state. Subject to the earthquake level P2, the bridge is in perfect elastic state. The isolating effect of the isolated bearings to the continuous girder bridge is better than the cable-stayed bridge with tower and beam consolidation.
