A four story building shown below is formed using one level of shoring and two l

Question

A four story building shown below is formed using one level of shoring and two levels of reshoring system. The thickness of each floor or slab is 8 in. The slab is designed for its weight, 30 psf superimposed dead load, and 54 psf live load. During the construction cycle, unit weight of concrete as 150 psf formwork load, and the 50 psf of construction load. Use unit weight of concrete as 150 psf. Assume rate of pour as one story per week (5 days) at temperature of 60 F. Assume that slab-4 is just poured. A) Prepare a table to compare the maximum slab load with equal distribution of construction load and slab load capacity when the slab-4 is poured. B) Identity which slab and under what stage of construction will have the maximum load and calculate the magnitude of that load, C) Calculate the magnitude of maximum load acting on shores. D) Also check whether the one level of shoring and two levels of reshoring system work or not.

Explanation / Answer

load on slab 4:

live load=54psf:dead load=30psf:self load=150psf*8*0.0833=99.96 psf.

toatal load=54+30+99.96=183.96 psf.

load on slab 3:

183.96psf+10/3+50/3(construction load equally divided for 3 slabs)+99.96(self wt)=303.91

load on slab 2"

303.91+3.33+16.67+99.96(self wt)=423.87 psf

load on slab 1:

423+3.33+16.67+99.96(self)=543.83 psf

b) max load is on slab 1 after construction of slab 4

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