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F- 1
Appendix F
Bridge Deficiency Assessment
The Transportation Improvement Program ( TIP) development process for bridge
projects involves consideration of several evaluation methods in order to prioritize
needed improvements. A sufficiency index is used to determine whether a bridge is
sufficient to remain in service, or to what extent it is deficient. The index is a percentage
in which 100 percent represents an entirely sufficient bridge and zero represents an
entirely insufficient or deficient bridge. Factors evaluated in calculating the index are
listed below.
· structural adequacy and safety
· serviceability and functional obsolescence
· essentiality for public use
· type of structure
· traffic safety features
The NCDOT Bridge Maintenance Unit inspects all bridges in North Carolina at least
once every two years. A sufficiency rating for each bridge is calculated and establishes
the eligibility and priority for replacement. Bridges having the highest priority are
replaced as Federal and State funds become available.
A bridge is considered deficient if it is either structurally deficient or functionally
obsolete. Structurally deficient means there are elements of the bridge that need to be
monitored and/ or repaired. The fact that a bridge is " structurally deficient" does not
imply that it is likely to collapse or that it is unsafe. It means the bridge must be
monitored, inspected and repaired/ replaced at an appropriate time to maintain its
structural integrity. A functionally obsolete bridge is one that was built to standards that
are not used today. These bridges are not automatically rated as structurally deficient,
nor are they inherently unsafe. Functionally obsolete bridges are those that do not have
adequate lane widths, shoulder widths, or vertical clearances to serve current traffic
demand or to meet the current geometric standards, or those that may be occasionally
flooded.
A bridge must be classified as deficient in order to quality for Federal replacement
funds. Additionally, the sufficiency rating must be less than 50% to qualify for
replacement or less than 80% to qualify for rehabilitation under federal funding.
Deficient bridges within the planning area are listed in Table 4.
Object Description
Description
| Title | Comprehensive transportation plan town of Norwood - Page 59 |
| Full Text | F- 1 Appendix F Bridge Deficiency Assessment The Transportation Improvement Program ( TIP) development process for bridge projects involves consideration of several evaluation methods in order to prioritize needed improvements. A sufficiency index is used to determine whether a bridge is sufficient to remain in service, or to what extent it is deficient. The index is a percentage in which 100 percent represents an entirely sufficient bridge and zero represents an entirely insufficient or deficient bridge. Factors evaluated in calculating the index are listed below. · structural adequacy and safety · serviceability and functional obsolescence · essentiality for public use · type of structure · traffic safety features The NCDOT Bridge Maintenance Unit inspects all bridges in North Carolina at least once every two years. A sufficiency rating for each bridge is calculated and establishes the eligibility and priority for replacement. Bridges having the highest priority are replaced as Federal and State funds become available. A bridge is considered deficient if it is either structurally deficient or functionally obsolete. Structurally deficient means there are elements of the bridge that need to be monitored and/ or repaired. The fact that a bridge is " structurally deficient" does not imply that it is likely to collapse or that it is unsafe. It means the bridge must be monitored, inspected and repaired/ replaced at an appropriate time to maintain its structural integrity. A functionally obsolete bridge is one that was built to standards that are not used today. These bridges are not automatically rated as structurally deficient, nor are they inherently unsafe. Functionally obsolete bridges are those that do not have adequate lane widths, shoulder widths, or vertical clearances to serve current traffic demand or to meet the current geometric standards, or those that may be occasionally flooded. A bridge must be classified as deficient in order to quality for Federal replacement funds. Additionally, the sufficiency rating must be less than 50% to qualify for replacement or less than 80% to qualify for rehabilitation under federal funding. Deficient bridges within the planning area are listed in Table 4. |
