2. A two-span continuous beam supporting a bridge deck is subjected to a total ultimate design load of w = 35kN/m. The d

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2 A Two Span Continuous Beam Supporting A Bridge Deck Is Subjected To A Total Ultimate Design Load Of W 35kn M The D 1 (252.71 KiB) Viewed 14 times

2. A two-span continuous beam supporting a bridge deck is subjected to a total ultimate design load of w = 35kN/m. The dimensions, boundary conditions and the bending moment diagram (BMD) are shown in Figure 2.1. The supports at ends A and C restrain vertical, longitudinal and lateral displacement. A free sliding spherical bearing, shown in Figure 2.2, and which restrains the vertical displacement only, is provided at intermediate support B, over which the beam is continuous. A B W 6.0m 5.0m 134.4 kNm BMD -97.48 kNm 2.35m 2.35m 1.3m 1.5m 1.75m 1.75m Figure 2.1. Beam dimensions, boundary conditions and bending moment diagram Top steel plate Stainless steel slide PTFE slide Convex plate Concave plate Curved PTFE Figure 2.2. Free sliding spherical bearing (for your information only) (a) Assuming that the bridge deck provides sufficient lateral restraint to the top flange, check if an Fe (430) S275 305 x 127 x 48 UB steel section provides sufficient flexural resistance (i.e. you are required to do only flexural checks). Note that the section provided is a Class1, Plastic section. (b) It has been identified that due to the support conditions at A & C, thermal effects can induce an additional ultimate compressive axial load of 200KN. (i) list the structural design issues that need to be investigated (ii) determine the maximum total ultimate vertical design load per unit length, w that the bridge beam can safely take in this scenario, clearly stating any assumptions you make. -52.50kNm