Effects of bridge deck gratings on the aerostatic responses of a long-span pedestrian suspension bridge with a SDBG.

This article investigates the influence of bridge deck gratings (BDGs) on the aerostatic responses of long-span pedestrian suspension bridges (LPSBs) with streamlined double-side box girders (SDBGs). Through force-measured wind tunnel tests on scaled section models with varying BDG arrangements and percentages of opening (β), the study quantifies aerostatic force coefficients (AFCs) and applies these to a finite element model to assess static wind loads and resulting bridge responses. Results indicate that using BDGs with β ≥ 11% significantly reduces aerostatic responses and their fluctuations, with β ≥ 33% recommended for optimal design; among BDG layouts, the arrangement with two strips of gratings (Case S) most effectively enhances aerostatic stability. The study also finds that wind attack angle affects bridge stiffness and response, with +3° being the most unfavorable for stability. These findings provide practical guidance for the aerodynamic design and wind resistance of LPSBs, while noting future research needs on flutter effects, pedestrian comfort, and maintenance considerations.