The calculated design compression capacity of the top chord member of a steel bridge truss shown in Figure 2 is 420 kN and the design member force is 400 kN as per the original design. However, a recent investigation on the bridge truss found that top chord members have only a residual capacity of 70% of its original design. The nominal self-weight of one truss including deck is 9 kN/m and the nominal imposed action is 15 kN/m. Calculate the new safe imposed action (kPa) on the bridge if the width of the bridge truss is 8 m.

 

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Initially the design capacity 420 kN Residual capacity 70 420 kN 294 kN Tributary width ... View the full answer