structural solution

Connection of North End Road with Bridge Road 4.1 4 Structural Solutions 4.1 Introduction 4.1.1 In order to obtain feasible and cost effective structural solutions a variety of options were considered. This included examining different structural forms, materials and geometrical layouts. Amongst these the vertical and horizontal profile constraints were the main governing factors, including future access to neighbouring sites and retaining the existing pedestrian routes. Maintaining the structural independence of Bobby Moore Bridge, without any structural attachment was another important consideration. 4.1.2 Following a collaborative study between Gifford and MVA, a preferred horizontal layout was defined for the connection between North End Road and Bridge Road. This is outlined in Chapter 3 and shown on drawin g 15459-FEA-0 02. This drawing also shows a new vehicu lar ramp access into the Arena House yard. 4.1.3 In view of the significant level difference between North End Road and Bridge Road, achieving an acceptable vertical profile for the connection, was a challenge. This necessitated an up-to-date and more comprehensive topographical survey which was carried out in December 2008. 4.1.4 The lack of detailed geotechnical information was another concern. As a result, discussion was held with Dr Kumar, who had reviewed the design of Bobby Moore Bridge and was present during its construction. This provided a better insight into the geotechnical characteristics of the site. 4.1.5 Following the above studies, over eight structural options including in-situ and pre-stressed concrete, cable stayed and box girder steel sections, steel concrete composite sections, box and trough concrete sections and earth fill/ reinforced earth ramp construction were considered. Having examined the cost, complexity, weight, sustainability and buildability aspects, these were s hort listed into 4 plausible and cost effective options. The chosen 4 structural options are: Option A - Reinforced Soil Ramp Construction with Pre-cast Concrete Facing Panels (Drawing 15459-FEA-003); Option B - Reinforced Soil Ramp Construction with Geo-synthetic and Steel Mesh Facing (Drawing 15459-FEA-0 04); Option C - Concrete Trough Section filled with Lightweight Fill (15459-FEA-005); and Option D - Steel and Concrete Composite Deck Bridge Structure (15459-FEA-006). 4.1.6 All four options will include a reinforced concrete cantilevered section/overhang at the interface with the Bobby Moore Bridge. This will be independent from the existing structure without any structural attachment. The interface will comprise a buried joint, allowing full articulation between the two elements. 4.1.7 The above 4 options and their relative cost indicators are described and discussed in the following sectio ns of this Chapter. Their associated strengths/ weaknesses are summarized in a SWOT analysis in Chapter 5.

structural solution

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