In view of the lack of U.S. standard reference content in the performance test of anchorage system, the U.S. Post-Tensioning Prestressing Institute (PTI) released in 1998 "Acceptance Standards for Post-Tensioning Systems" (Acceptance Standards for Post-Tensioning Systems), supplemented by perfecting the content of the recognition of the clamped strand anchorage system, for the reference of the domestic industry, production, scientific research and certification units.