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E. CONCLUSIONS AND RECOMMENDATIONS <br />Our analysis shows that the maximum member stresses conform to Aluminum <br />Association Allowable Stress Design criteria.In addition, the maximum bolt <br />stresses conform to AISC Allowable Stress Design criteria. Therefore, the 65 ft. x <br />45 ft. roof top with sound wings is structurally adequate for the anticipated <br />gravity and wind load combinations that it may experience. <br />Our analysis shows that consideration is required for uplift and overturning <br />stability of the roof top structure. Provision of guy supports, hold-downs, and <br />ballast at the tower legs is required for wind load stability. In addition, it was <br />found that the ballast requirements at the tower legs are most critical when the <br />roof top structures are unloaded. <br />Our analysis shows that the roof top structure must be guyed in order to support <br />the proposed maximum uniformly distributed operating load of 60,000 lbs. In <br />addition, the roof must be securely attached to the towers and sound wings in <br />order for the rated capacity to exceed the lifting capacity of the hoists, 40,000 <br />lbs. Finally, provided that the supporting soils have a reasonable allowable bearing <br />capacity of 1500 psf, the towers can be adequately supported on 4 ft. x 4 ft.timbar mats. <br />12 <br />W