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I I I I I I I I I I I I I I I I I I I walls. The second approach would be to lower the bridge deck elevation closer to grade with the use of a structural system that provides its main support system above the deck level. While theoretically possible, the complexity of such a bridge would be significant and costs would escalate rapidly. One of the newest concepts in bridge construction is the "Channel Bridge". The Channel Bridge features two post- tensioned edge beams that function as the main load carrying structural components and a post-tentsioned deck supported between them. Figure 2 depicts a detail of the edge beams for a Channel Bridge. ~;;. E..{ .", , ~. ,1; Ii Chntlnel Brle.g(l segment 1$ $wvng Into ;JO$i1iOtl O\'C( lhc cr<:c1iOtl girdor1- 3;1 the- C~l~~ilror ~~;" .i~o. Such an exotic single-span structure can be designed to be artistic, however, this corridor is surrounded by medium Figure 2 sized buildings and the introduction of such elements could lead to a cluttered environment. Whether utilizing above deck bridge structure or retaining wall transitions, a single span bridge will lead to project elements which are out-of-scale to the confined environment. We would prefer ".2' to keep the bridge structure low ;,~ .'~~.()' "..' 12'.()' 24'.0 1Z.()' ..!;~ .:~. ~~ and simple while allowing the trJ/ SIDEWALK--- EMERGENCY LANE EMERGENCY LANE SIDEWALK U enhancement of the pedestrian f- JL areas through more human- I B B scale improvements such as landscaping, lighting and street m:,'i,":J'V'E'L " ~~,'i,"::"E furniture. _~ __-.J To simplify the project, it will be necessary to discuss the possibility of a multi span bridge structure for the crossing. A multi-span bridge would allow us to keep the structure relatively low while utilizing less exotic techniques. We would recommend consideration for a three span bridge with two intermediate piers within the canal. This configuration also allows us to more easily accommodate the distortion in the bridge structure by aligning the intermediate piers to the horizontal alignment. BRIDGE TYPICAL SECTION "2'-2" ;,;.!.:. r.()' 26'-0" r.()' 1'-,. -, e II ,---.., ~ 12'-0" EMERGENCY LANES 12'-0" ..!;! EMERGENCY LANES REMOVABLE FI' BOlLAROS --~ REMOVABLE DECORATED CHAIN REMOVABLE SOUAROS ~ ~REO ..,c. CONCRETE SURFACE . DECORATIVE TEXTIJRE PEDESTRIAN PlAZA STRUCTURE WITH EMERGENCY VEHICLE CAPABILITY Figure 3 Considering a three-span configuration with a moderate amount of bridge deck distortion, we would recommend a structural system utilizing precast prestressed concrete beams with a cast-in-place reinforced concrete topping as shown in Figure 3. These precast members would span from pier to pier and act as a stay in place form system for a cast-in-place topping. The cast-in-place topping would wrap around the edge along each side of the structure and could be extended as needed to allow for the deck widening at the curves and for adding architectural features such as the "vista view" shown in Figure 4. The combined system would then be post-tensioned laterally to account for any differential deflection and torsion caused by the curvature of the deck. This system would be economical and could be constructed by local contractors and suppliers. Furthermore, it could be constructed on an accelerated time frame due to the minimal form work needed over the canal. The selection of a Page 3 of 7