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Nonlinear Analysis of Traffic Poles and Signal Lights Using New ATLAS V6.01


Nonlinear Analysis of Traffic Poles and Signal Lights Using New ATLAS V6.01 . Bridge Software Institute, Gainesville, FL, USA. Overview of Atlas Version 6.01. Scope of Update Wind Pressure Equation (AASHTO 2006) has been implemented.

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Nonlinear Analysis of Traffic Poles and Signal Lights Using New ATLAS V6.01

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Nonlinear Analysis of Traffic Poles and Signal Lights Using New ATLAS V6.01

Bridge Software Institute, Gainesville, FL, USA


Overview of atlas version 6 01 l.jpg

Overview of Atlas Version 6.01

  • Scope of Update

    • Wind Pressure Equation (AASHTO 2006) has been implemented.

    • Pole design is performed according to FDOT Standard Index 17725, which requires both service load and factored load checks.

  • New features of Atlas V6.01 are as follows:

    • User can input wind velocity as either user-defined velocity or selection of county (Florida)

    • Foundation Design has been updated in order to determine the Embedment Length of Pole

    • “Results Viewer” is available to navigate through the output data.

  • Wind angle is limited between zero and ninety degrees.


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Wind Pressure Equation (AASHTO 2006) is used to compute wind loading.

New Wind Pressure Equation (AASHTO 2006)

Old Wind Pressure Equation


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FDOT Standard Index 17725 is implemented to select pole size that meets both service load and factored load requirements.

FDOT Standard Index 17725

Table 2 : Load Factored

Table 1 : Service Load

Table 2 : Factored Load

Table 1 : Service Load


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User can choose county to select wind velocity

Wind Velocity Selection by County

Wind Load Application

Wind Menu of Atlas V6.01


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Foundation Design accounts for Phi Factor (strength reduction factor) to determine the embedment depth using Brom’s method.

Foundation Design

Brom’s Method is used to determine the required

embedment length of the selected pole to compute max. load resistance


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Cable Design in V6.01 remains same as V5.04 using an approach shown below:

This approach is intended to retain a same SF used in Version 5.04

Cable Design


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Results Viewer is to help users search for analysis results by key word index

Result Search Tool

Results Reviewer in Atlas V6.01


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Results Comparison (V5.04 vs. V6.01)

  • Applied Wind Velocity 100 mph

  • Pole Design

    • Version 5.04 – NV pole

    • Version 6.01 – PIV pole

  • Cable Design

    • Version 5.04

    • Version 6.01

  • Foundation Design

    • Version 5.04

    • Version 6.01

  • Wind velocity of V6.01 equivalent to a wind velocity of 100 mph using V5.04 ~ 145 mph

  • Conservative error in wind load application in V5.04 has been corrected.


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Summary

To quantify

  • Influence of severe wind on system response

  • Effect of pole and cable size on system performance

  • Total structural demand and adequate design

    Recommendations are

  • Quantification of forces in a worst case of wind

  • Iterative analyses with required pole/cable design