May 8, 1916 



Tests of Reinforced-Concrete Slabs 



231 



CONCLUSION 



If figure 27 is referred to, the influence on the effective width of the 

 magnitude of the load and the manner of interpreting the results may be 



Fig. 26. — Iso-defortnation lines for slab 934 under 40,000-pound 4-point loading. Deformations measured 



perpendicular to supports. 



seen. It has been pointed out that the correct method of obtaining 

 deformations is to base all calculations on zero readings taken just before 



LOAD CONCCMTHATCD AT CCNTCR 



Fig. 27. — Curves showing efifective width versus load (concentrated center load). 



the load has been applied (designated on the curve as "new zero"). In 

 the case of slab 930, figure 8, note the difference in effective width obtained 



