Q1 Figure Q1(a) shows a pedestrian bridge to provide connectivity between two identical buildings (Building A and Buildi

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Q1 Figure Q1 A Shows A Pedestrian Bridge To Provide Connectivity Between Two Identical Buildings Building A And Buildi 1 (93.32 KiB) Viewed 43 times

Q1 Figure Q1 A Shows A Pedestrian Bridge To Provide Connectivity Between Two Identical Buildings Building A And Buildi 2 (30.81 KiB) Viewed 43 times

Q1 Figure Q1(a) shows a pedestrian bridge to provide connectivity between two identical buildings (Building A and Building B) that are separated by 8 m. The bridge is built from two 8 m long Primary Beams which forms the main support for a Timber-Concrete Composite (TCC) deck as shown in Figure Q1(b). Support Struts placed at 45° helps to reduce the bending moment demand of the Primary Beam. Double LVL which forms the TCC joists are spaced at 0.75 m centres and spans between the two Primary Beams as shown in Figure Q1(b). This question concerns the design of the TCC deck on the pedestrian bridge. Consider the worst case exposure condition in the design. Given as follows are design data to be used in your design solutions based on BS EN 1995-1-1: Recommended actions for design: Variable action on bridge 3 kN/m² Permanent action for finishes and services on bridge 1 kN/m2 Density of concrete 24 kN/m2 Concrete thickness in TCC 75 mm LVL Type Nelson-Pine LVL13 TCC design data: Mean compressive strength of concrete 48 MPa Mean Young's modulus of concrete 35 GP Characteristic strength of connection, Fx 275 kN Connection stiffness for SLS, Ksus 400,000 N/mm Connection stiffness for SLS, KUS 300,000 N/mm Effective spacing of connection, Sor 250 mm ULS design load for TCC joist 6.62 kN/m SLS design load for TCC joist 4.65 kN/m = (a) (6) Calculate the effective bending stiffness, (El): to be used for short-term SLS design of TCC. Given the corresponding gamma coefficient, yz is 0.75. (8 marks) On the assumption that SLS deflection governs, propose the smallest possible TCC double joists (LVL13) to satisfy deflection limit of span/300. (12 marks) Provide a drawing sketch of your proposed preliminary design. The sketch should include important labels and dimensions. (5 marks) (c)
Building B 8 m m Building A NNN RF Primary Beam 2F 45"> IF Support strut Columns GF FIGURE Q1(a) Primary Beam Concrete с LVL с 6 m Section B-B Concrete 75 mm thick Double LVL Primary beam 0.75 m 0.75 m Section C-C FIGURE Q1(b)