Design of a Long-Span Suspension Bridge Anchorage System Located in a High Seismic Region and Susceptible to Large Cargo-Vessel Impact

摘要

This paper discusses the design of an approximately 1200-meter long main-span suspension bridge anchorage system. The bridge is founded within extremely challenging strata consisting of very deep weak clay and silt overlaying foliated rock of variable degrees of weathering, in some areas containing highly fractured/sheared zones. The Southwest Anchorage foundation, the main subject of this paper, is composed of large diameter post-tensioned cast-in-place steel shelled concrete piles, utilizing a unique battered arrangement (i.e., battered, rock-socketed bored piles). It is subjected to large-vessel impact risk and is located in a region with high seismicity.