Analysis on Transverse Stiffness Limit of Steel Truss-arch Bridge

摘要

Focused on Yangtze River Bridge at Nanjing - a steel truss-arch bridge with main span 336 m, an analysis on the random vibration response of time-dependant train-bridge system has been conducted in detail in this paper. Fulfilling the requirement of running safety(expressed as derailment coefficient Q/P < 0.8, offload factor ΔP/P < 0.60), the relation curve between the lateral ridding comfort--Sperling index Wz.max of vehicles and the width B of truss are drawn under single or double set of train running on the bridge with various speed in one direction or two opposite directions, the width B of truss in accordance with the allowable lateral Sperling comfort index criteria Wz.max 2.75 is determined, which is just the allowable width B of bridge, the transverse stiffness criteria--width-span ration [B/L] of bridge are then obtained. The research achievements obtained in this paper can be referred to the design of high speed railway long span steel bridge.