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The control was always performed in the bottom zone of the test. The control included the calculation of the failure criterion, verification of the minimum crack width, and analysis of the cross-sectional change due to cracking.In case of a controlled crack (like the top zone in the control scenario), the maximum allowed crack width in the lower zone is large enough to allow the minimum crack width within the test period. This enables repeating of the failure criterion as described in the test protocol. If the crack width in the lower zone is larger than the minimum crack width, then the test can be repeated.When the critical growth distance for the failure criterion is fulfilled in the lower zone, the test is terminated. The most representative outlier data of the last third of test is used for the analysis. The analysis of the cross-sectional change due to cracking includes the investigation of a crack continuation and new crack formation. Both analyses show the same distribution of cracks, but very small cracks with a crack width of about and a crack length of about are not analysed here, because there is a limit for the smallest crack widths in the control scenario. The most representative outlier data of the last third of test is used for the analysis. Several specimens failed in the shear tensile zone of the longitudinal reinforcement. The failure mode in these cases is an initial yielding of the longitudinal reinforcement and a subsequent yielding of the spandrel. The cracks that are most prominently visible in the spandrel are depicted in Figure 8.
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