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WORK PACKAGE 9: PRACTICAL BRIDGE MANAGEMENT - page 28 / 67

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SAMCO Final Report 2006 F09 Report on Bridge Management

Inspection Type

Frequency

Personnel

Description

Result

General (System- atic)

3 months

Trained personnel

Visual inspection of each part of the struc- ture

"Faults Report"

1 year

Engineer

Principal

1-2-4 years

Engineer

Close visual inspection of each part of the structure

"Faults Chart"

Special

When needed

Engineer

Visual inspection com- bined with NDT-testing and sampling.

Report

Special inspections. Special inspections are carried out when needed, in general, to assess the structural relevance of visual damage. They aim at detecting, by means of instrumental control, faults and irregular behaviours, which by simple visual checks, cannot be identified. They are mostly used as input for design of repairs.

Over the years a shift from handicraft surveillance systems, grounded on each sur- veyor’s sensitivity and expert eye, to advanced systems characterized by uniform criteria for assessment of faults has been witness. This result has been achieved through longstanding experience and careful and through scientific research. Today, thanks to an electronic data bank storing both coded historical data and data col- lected during inspections, an immediate knowledge concerning the condition state of each structure is possible.

Table 10. Inspection types in Italy.

Rating 0

Description No significant defects. Feedback to routine maintenance.

Only minor signs of deterioration. Damage does not develop . No specific action is needed.

2

Only minor defects, at a preliminary stage, that might develop further. No specific action is needed.

3 4

Defects are developing, but no specific action is needed.

Defects are developing, but they are of a non-urgent nature. Measures to stop damage are not foreseeable up to 5 years.

5

Damage has reached such a condition that repair is required within 5 years. However damaged does not affect the structural safety.

6

Damage does not compromise safety, but actions must be taken within 2 years.

7

Damage reduces the safety coefficient, actions must be taken within 2 years.

1

Table 11. Condition ratings used in Italy.

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