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OCR for page 25
25 rib spacing and rib height (according to the standard under strain gages on the developed/spliced reinforcing bars; loca- which the bar was manufactured as well as the average value), tion, type, and number of displacement transducers; the full relative rib area, rib angle (the included angle between the rib load-deflection curves for the tests; and the number and and the bar axis), rib-face angle, and type of coating and coat- location of load measurement devices. More information on ing thickness (if applicable). the local behavior of the splice or development length can be obtained by placing strain gages on the bar itself. The strain 184.108.40.206 Specimen Characteristics gage instrumentation provides information on the changes in bar force along its length. In order to avoid excessive distur- The following specimen characteristics should be recorded: bances due to the presence of the gages, they are installed by exterior dimensions, the location of structural/tensile rein- splitting the bar in half, forming a channel along the center- forcement (including the effective depth), bottom/top cover, line. Strain gages and wires are then placed in the channel, side cover, the clear spacing between bars, and the length of the and the bar is welded together. An acceptable alternative is to specimen. These additional specimen characteristics should be place the wires and gages in grooves cut along the longitudi- recorded: the length of the developed/spliced bars, the number nal ribs of the bar. Transverse reinforcement should be of developed/spliced bars, the number and average spacing of instrumented as well. Surface concrete strains should be stirrups/ties used as transverse reinforcement in the region of monitored in the test region using strain gages and/or Zurich- the developed/spliced bars, the tensile strength of this rein- type gages by means of a reference grid attached to the surface forcement, and the load (tensile/bending) on the specimen at the time of failure (including the specimen self-weight and the of the specimen. weight of the test system). Specimen dimensions should be measured after casting. It is also recommended that the cover 2.5 Summary be measured after casting and/or testing. Based on the results of the literature review conducted in this chapter, the experimental plan for NCHRP Project 12-60 220.127.116.11 Test Information was refined and carried out with the approval from the proj- The following basic information should be recorded for ect panel. The results of the entire experimental program for each test: a description of the test system; the weight of the both strand and mild steel are presented and discussed in loading system; the rate of loading; the presence or absence of Chapter 3 of this report.