PSI - Issue 84

A.A. Khalil et al. / Procedia Structural Integrity 84 (2026) 983–990

984

Keywords: Applied Element Method; Deconstruction analysis; Champlain Bridge; Load redistribution; Bridge demolition; Aging infrastructure.

1. Introduction The original Champlain Bridge, opened in 1962, spans the Saint Lawrence River, connecting Montreal to its South Shore. After decades of service, the bridge suffered significant degradation due to environmental exposure, particularly from de-icing salts. The demolition of the original bridge posed unique engineering challenges due to its length, geometry, and advanced state of degradation. The bridge comprises three sections: Section 5 (piers 44W to 4W), Section 6 (steel truss cantilever over the seaway), and Section 7 (piers 4E to 14E). Sections 5 and 7 consist mainly of pre-stressed concrete girders resting on reinforced concrete piers (Figure 1).

Section 5

Section 6

Section 7

Fig. 1. Original Champlain Bridge: overall plan showing Sections 5–7 and pier numbering.

2. Description of the structure The Section 5’s typical span is approximately 53.75 meters long and consists of seven precast concrete girders spaced approximately 3.72 meters apart (Figure 2). Cast‑in‑place slabs between girder top flanges complete the deck system. Two half‑depth diaphragms are provided near the span ends and two full‑depth diaphragms at midspan, enhancing transverse stiffness and load distribution.

Fig. 2. Section 5 typical deck cross‑section: seven precast girders with cast‑in‑place slab and diaphragms.