American Audio VELOCITY - REV 4-05 Betriebsanleitung PDF herunterladen (Seite 160)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

DE304.09 9-155 Revision 4 : 05/09/12

Metro Baseline Re-Baseline: 04/29/10

Steel poles, cantilevers and other structures shall be designed by the

allowable stress method according to the AISC Specification for the

Design, Fabrication and Erection of Structural Steel for Buildings (AISC

S326).

Reinforced concrete drilled pier foundations shall be designed by the

ultimate strength method according to the ACI Building Code

Requirements for Reinforced Concrete (ACI 318); anchor bolts shall be

bolts shall be designed based on ungrouted pole baseplate.

Laterally loaded pier foundations shall be proportioned according to the

Texas Transportation Institute, Resistance of a Drilled Shaft Footing to

Overturning Loads - (Research Reports 105-1, 2 and 3). A minimum

factor of safety (to failure of soil) of 2.0 shall be used in the design.

For combined dead plus live (wind) loading the 33 percent increase in

allowable stress specified by the AISC and ACI code shall be waived.

c. Design for Deflection

OCS support structures shall be designed so that structure deflections

under service loads will not cause excessive movement of the contact

wire. In addition, the steel pole shall be raked to compensate for the

deflection generated by the self-weight and conductor tension loading.

Design of support structures shall be based on the following criteria for

deflection and foundation rotation:

Structure Loading Maximum Deflection Remarks

Steel Pole Live (wind) 2 ½" @ contact wire,

level, including

foundation rotation effect

Total deflection

level including

foundation

effect shall be

less than 4”

Dead+Live 2.5% of pole height

Foundation Live (wind) 0.5% rotation

Dead+Alive 5.0% rotation

d. Seismic Design

OCS support structures shall be designed to conform to the seismic

design requirements of the UBC.

13. OCS Grounding and Bonding

a. The OCS poles shall be properly grounded by grounding rods in

accordance with NEC requirements. Ground resistance shall be a

maximum of 25 ohms on regular poles and a maximum of 5 ohms on

poles provided with surge arrestors.

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American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 160

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