they were place there to measure the strains in the concrete at those locations. Before

concrete cracking the strains in the concrete and the steel are the same. The strain gages

on the top of the beams were labeled from north to south as ST1 through ST3.

 B eam Top


 SE2
 4 @1.5" I SE4 SE3
 ---^^SE5SE4

 3" __-- 1_._ SE6
 I
 -' ---L = -- SE7



 Beam Centerline

Figure 4-8. Strain gage arrangement (side view of center portion of the beam)


Figure 4-9. Strain gage arrangement (top view of center portion of the beam)

 The strain gages on the side of the beams were used to measure strain across the

cross-section of the beams whereas the strain gages on top to measure any transverse

expansion of the compression zone due to the Poisson effect.

 Data from all instrumentation devices were recorded using a data acquisition

system at a rate of 4 Hz.