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Engineering · Civil Engineering
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A pedestrian bridge structure is shown below that consists of 6 inch precast concrete hollow-core floor planks supported by concrete beams and columns as shown. Furthermore, a 2 inch concrete topping slab is poured over top of the hollowcore planks to provide a wearing surface. Also shown, CMU railing walls are provided where indicated. Precast hollow-core planks (typ.) 3-6 high CMU railing 6-0 Normalwelght Concrete 4-о (typ.) cont beam below | | |10-O Area of hollow-core plank 187 in? FLOOR PLAN 2 tapping sab 18 x24 conc. beams hollow-core planks Note: CMU railing not shown in Elevation view 10-0 , 12X12 conc. cols. 10r-0 ELEVATION Unit weights: Concrete-150 lb/ft Ipcf] > Hollow-core plank 49 1b/ft2 [psf CMU masonry wall 87 Ib/ft [pst] Other loads: Superimposed Dead Load (DL) - 25 psf Live Load (LL) 100 psf Part () For the structure shown above, determine the individual DL and LL column foundation reactions of the concrete columns. The column fixity at the top and bottom can be assumed as pinned (i.e.. no moment transfer). Part (2) Draw the shear and bending moment diagram for combined DL + LL load case for a typical hollow-core floor plank. The support fixity at the concrete beam supports can be assumed as pinned

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