13th International Conference on Fracture June 16–21, 2013, Beijing, China -8- 4. Results and discussion The theoretical value of the overall elastic follow-up of the rig was calculated using the equations provided in [13]. Results from the preliminary tests consisted of measured strains, applied load, CMOD, overall displacement of the rig, accurate measurement of the diameters and length of the bars. The initial tensile tests measured the stiffness for each element of the assembly. Table 2 compares the experimental values obtained from preliminary test with theoretical values. It is evident from the results that a good agreement was found. Figure 6. Variation of force in all bars with time Figure 7. Load versus total load line displacement for C(T) specimen The test results from the second category of tests are shown in fig 6, and give the details of variation of the residual force and its relaxation as the applied load increased. It is observed that under equilibrium condition, the total compressive residual force in the side bars was approximately equal
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