This document defines criteria for issuing permits for overweight vehicles passing over H15, H20, and HS20 highway bridges in the state of Texas. The resulting formulae have been developed to ensure that the maximum stress does not exceed the operational stress level. The general formula is a function of only the vehicle dimensions and is similar to the current Texas permit rules. The current Texas Department of Transportation (TxDOT) permit rules for mobile cranes and oil well equipment vehicles only apply for wheelbases up to 80 ft. (24.4 m). The proposed formula is calculated for wheelbases up to 120 ft. (36.6 m). The formula developed is significantly more restrictive than that currently used by TxDOT. A second formula has been developed based on the vehicle dimensions and the span length of any bridge along the permitted vehicle route. With this bridge-specific formula, higher permit weights can be safely authorized without additional engineering analysis.
Overload Permit Procedures (Revised)
1994
214 pages
Report
No indication
English
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