JMEC has been structural consultant to repair and reconstruct a 2-span timber pedestrian bridge (with 36'-8' span and 44' total length) built in the early 70's with timber log stringers that was damaged by the rainstorm in 2023. FEMA funds have been used to repair and reconstruct this flood damaged structure.

Debris flow and collapsed block wall had deformed the timber logs cross sections resulting in changes in deck cross slope up to 10%. Dry rots were later found in the timber log stringers with hollow interior sections and the change in deck cross slope was due to ovalling of the timber log sections.

In the bridge repair, the existing bridge components were re-used as much as practical to preserve environment, to maintenance existing features and to meet the FEMA requirements for emergency repair. Only bridge components that posed safety hazards were replaced and the reconstructed bridge was designed per AASHTO LRFD Guide Specifications for the Design of Pedestrian Bridges; 2nd edition and with 2015 Interim Revisions.

In the reconstructed bridge, the locations of new abutments were relocated about 3' further away from the creek banks to more stable ground (with 39'-11' span and 50' total length), the log stringers were replaced with environmentally friendly Alaskan Cedar Glulam Beams without wood preservative treatments. Timber beams in the bent were replaced and the bent posts were confined by reinforced concrete jackets. Drain inlets were added to improve roadway drainage, and erosion controlled measures were installed to protect the embankments.

Project Role:  Prime Design Consultant

Clients:  Town of Woodside

Schedule:  Construction was completed in 10/2023

Special Features:  Water Pollution Control Program (WPCP) using BMPs was implemented to protect the creek and the environment during construction.

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Damaged Log Bridge after 2023 Rainstorm
Final Reconstructed Bridge