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The publisher regrets that errors appeared in this paper when it was published online ahead of print and in Proceedings of the Institution of Civil Engineers – Forensic Engineering 170(2): 84–99, http://dx.doi.org/10.1680/jfoen.16.00035.
In Equation 52, the final term should be U iv, not U i. In Equation 54, the first operator should be a minus symbol, not a plus symbol. The correct equations are as follows.
52
54
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2017
