The analysis of the existing masonry wall revealed that the wall only provides a small percentage of the required resistance for the specified blast. Due to the symmetry of the wall and the reinforcement (for the upgrade system), the analysis for the rebound blast loads was not required
A complete Analysis of the wall will need to include the evaluation of the existing connection of the wall to the grade beam and roof. The evaluation may reveal that the connections are inadequate for the specified loads, thus a corrective procedure should be specified. For option #1 where reinforcement is added to the existing wall, dowels should be specified and embedded in the masonry and the concrete beams (refer to Figure 10-5), alternatively continuous steel angles can be used to concrete the walls to the roof and grade beam. This approach can also be applied to Option #2. However, if new precast concrete walls are added next to the existing wall, the wall can be directly bolted to the grade beam and roof beam (refer to Figure 10-7). In this case, the bolts should be checked for rebound pullout forces,
In this example, retrofit Option #1 is likely to be the most cost effective upgrade because of the minimal usage of new materials and form work. This option might not be feasible due to existing obstructions, or due to extensive alterations required to achieve the proposed reinforcement scheme, If Option #1 is not practical or feasible, one of the other options may be used. The cost differential between the options should be minimal.
The analysis of the existing masonry wall revealed that the wall only provides a small percentage of the required resistance for the specified blast. Due to the symmetry of the wall and the reinforcement (for the upgrade system), the analysis for the rebound blast loads was not required A complete Analysis of the wall will need to include the evaluation of the existing connection of the wall to the grade beam and roof. The evaluation may reveal that the connections are inadequate for the specified loads, thus a corrective procedure should be specified. For option #1 where reinforcement is added to the existing wall, dowels should be specified and embedded in the masonry and the concrete beams (refer to Figure 10-5), alternatively continuous steel angles can be used to concrete the walls to the roof and grade beam. This approach can also be applied to Option #2. However, if new precast concrete walls are added next to the existing wall, the wall can be directly bolted to the grade beam and roof beam (refer to Figure 10-7). In this case, the bolts should be checked for rebound pullout forces, In this example, retrofit Option #1 is likely to be the most cost effective upgrade because of the minimal usage of new materials and form work. This option might not be feasible due to existing obstructions, or due to extensive alterations required to achieve the proposed reinforcement scheme, If Option #1 is not practical or feasible, one of the other options may be used. The cost differential between the options should be minimal.
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