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1220 N. Muciri 6t. <br />Vb�l�, CA, USA Y71Y1 <br />'�/// %� a/�•,••�. <br />//,. / �:_.,,, <br />j/�/ 'o0/^G� <br />����jw��"lii%� <br />FORMAL STRESS ANALYS/S DOCUMENT <br />Self-Supportlny Cnnk-Up Tubu/ar Mast <br />Tower Model: MA-S50 Wlth MARB <br />Desipn Specificatlons Meetinp; <br />1997 Uniform Buildirp Cpde (UBC) <br />Mslpn Wlnd Spead: <br />Ip Lwdinp: <br />Exposun: <br />�mportana Factor. <br />Anbnna Loadinp: <br />Max. Pro/ectedqrea (af 1'above tower): <br />Wrth round elements 2^e and less <br />With round elements > 2"e <br />Wtth Flat elemerrts <br />With 409b Flat 8 80% Round elements <br />Max. M►enna Weipht: <br />Phom <br />Fu <br />e0 mph Basic SO mph Basic <br />None None <br />8.5 sq. R <br />8.1 sq. ft <br />5 sq. R. <br />5.8 sq. ft. <br />75 Ibs. <br />1.00 <br />22 sq. R. <br />27.5 sq. R. <br />18.9 sq. ft <br />1 B.8 sq, ft. <br />1201bs. <br />K <br />w <br />J � <br />w f � ' <br />� Y ` <br />c <br />z z s <br />o � <br />w � � , <br />5 = w �` <br />,�z wp , <br />Qz �v3F- <br />o�p S�O <br />��� �O� � <br />o � <br />�$� ��m o � <br />� o �� € <br />� <br />d <br />2 � a <br />Q . <br />W � m� = 3 LL <br />� Q y C u� O � <br />�a��'g�� u � <br />� °6�a�� � Q <br />Not�s: <br />1. AMenna areas irxlicated at 50 mph Basic wind speeds are for infortnation only. The bads indicated within <br />this analysis have been penerated usinp the aMenna area asaodated wRh 70 mph Basic wirM speed. <br />2. Analysis based on albwable stress desipn as defined by UBG97 section 1802. <br />3. Analysis methodobpy uses fundamental concepts in sta8c equilibrium. The method for determininp <br />mast defiections is based on the Moment Area MeH�od. The results of our methodobpy has <br />been verified and checked with tradkional strudural hand calculatbns. <br />4. Faaors of Safety and/or Stress ratias are equal to the cak�lated stress divided by the AISC albwable stress> <br />Albwable stresses have been increased by 1/3 as defined in UBG87 secGon 1812, �- <br />5. This structure has been designed only for the antenna loads indfcated within fhese calculatlons, qny ��,''' J <br />w <br />additbnal loads or difterences in design criteria shall be broupM to the attentbn of US Tower Corp, s, - <br />6. The engineerinp and desipn o(tt,� antennas are beyoiW the swpe of these calculations. �_ u;. ��„ <br />�.._ �� <br />7. All welds are perfortned by pyyS certffied welders utilfzirq ER70S.tl wekling wire under a GMAW ��', �.. ���; <br />(sH� ay Arc) weldinp Process. <br />8. US Tower Co ' "'t <br />rP• recommends that the installatbn of this tower and Rs foundatbn be perfortnEy by a � �.; u� <br />Professanal, licensed Co�tractorwith experience in installinp these types of strudures. �K ��� <br />9. This documern is provided only fur the use of obtaininp bulkllrp pertnks and for tower des' n u ��: _"�° �: <br />10. This analysis assumes the tower has been extended to US Tower s p P�Ses �y �' - <br />r, a�'o-'¢ <br />pectiflcations and is verticaly plumb.F.q, �na � <br />8/162002 Page 7 of 8 <br />ww�v.ustower.com <br />