Structural Evaluation of the John A. Roebling Suspension Bridge Element Level Analysis

摘要

The primary objective of the structural evaluation of the John A. Roebling Bridge is to determine the maximum allowable gross vehicle weight (GVW) that can be carried by the bridge deck structural elements such as the open steel grid deck, channels, standard sections, or built-up sections. To achieve this objective, an 'Element Level Analysis' is carried out. The maximum allowable GVW for different truck and bus types are presented for different levels of structural elements sections loss. The loss or reduction in element section properties is due to rust, cracks, etc. The critical member in the bridge deck is the built-up 36 inch deep section. Its allowable bending strength controls the maximum GVW that can be permitted on the bridge. Results are presented for different levels of sectional losses (10% to 40%, in 10% increments). In the event that replacement of the open grid deck will take place in the future, results are presented for different deck weights (10 psf to 50 psf in 10 psf increments). The current open grid deck weight is 20 psf.