Abstract
Lots of inspection work is needed for big, long structures such as coast levee and sea wall. To examine the possibilities to simplify the inspection, the number and the widths of cracks and the sizes of un-reinforced concrete parapets have been measured in the field investigation and extreme value statistics have been applied. It was confirmed that the distribution of maximum crack widths follows the Gumbel distribution. It was concluded that the maximum crack width can be predicted when only 1/5 to 1/4 area of the entire span of parapet are surveyed.
