DIN EN 1993-1-12/NA:2011 国家附录.国家制定参数.欧洲规范3:钢结构设计.第1-12部分:扩充EN 1993钢等级<S700的额外规则
National Annex - Nationally determined parameters - Eurocode 3: Design of steel structures - Part 1-12: Additional rules for the extention of EN 1993 up to steel grades S700