American Audio VELOCITY - REV 4-05 Betriebsanleitung PDF herunterladen (Seite 159)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

DE304.09 9-154 Revision 4 : 05/09/12

Metro Baseline Re-Baseline: 04/29/10

Contact Wire

Location

Lateral Vertical

Subways +

1" +0”, -1”

Railroad Crossings +

2" +2”, -0”

Overlap locations(Between parallel wires) +

1/2" +1/2”

All others +

2" + 2"

Structures

Along-track spotting tolerance

Special trackwork locations = +

2'- 6"

At other locations = +

5'- 0"

Cross-track spotting tolerance

At restricted locations -13'- 0" track

spacing

= +

3/4"

At other locations = +

1 1/2"

12. Structure Design

OCS support structures shall be designed to carry the design loads

according to the requirements of strength design and deflection design.

CPUC General Order 95 shall be used except where more stringent AISC

and ACI requirements for steel and concrete design are applied.

a. Design Loads

OCS support structure design loads shall be the system self-weight plus

the loads indicated in CPUC General Order 95, Light Loading.

Self-weight shall be the actual weights of poles, cantilevers, assemblies

and conductors computed according to the AISC Manual of Steel

Construction or obtained from manufacturer's catalogs, as applicable.

Wind loads shall be determined in accordance with CPUC General Order

95. According to this Order, a horizontal wind pressure of 8 pounds per

square foot of projected area on cylindrical surfaces and 13 pounds per

square foot on flat surfaces shall be assumed for all regions of California

having an altitude of less than 3000 feet.

The design load shall be multiplied by the following overload factors to

allow for uncertainties in loading conditions:

Design for strength = 1.1

Design for deflection = 1.0

b. Design for Strength

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