Abstract:Anchor bolts for a wind power plant’s P&H prestress pile foundation were fractured after installation. Units were forced to stop, foundation need repair or rebuilt, and caused enormous economic losses. Macroscopic and microcosmic analysis were made, and confirmed that the fracture was caused by insufficient material toughness. Due to inner defect and impurities, stress concentrated partially, and caused crack extended, finally fracture. Material selection standard was discussed, advises were provided for similar projects. 

Keywords:wind power, foundation, high strength anchor bolt, fracture