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为更好地保护木构古建筑,对故宫太和殿二层斗拱开展了水平低周反复加载试验.制作了斗拱的1∶2缩尺比例模型,分别对其进行横向及纵向加载,研究其抗震参数.结果表明:相对于纵向加载,斗拱沿横向加载时更容易产生构件破坏.各斗拱极限承载力由大到小的顺序为:柱头科横向加载、平身科横向加载、角科加载、平身科纵向加载、柱头科纵向加载;延性系数由大到小的顺序为:柱头科纵向加载、平身科纵向加载、柱头科横向加载、角科加载、平身科横向加载;耗能能力由大到小的顺序为:角科加载、柱头科横向加载、平身科纵向加载、柱头科纵向加载、平身科横向加载;刚度退化程度由重至轻的顺序为:平身科横向加载、柱头科横向加载、角科加载、平身科纵向加载、柱头科纵向加载.太和殿二层斗拱的水平刚度模型可简化为三折线段形式.
In order to better protect the ancient wooden buildings, the horizontal low cycle repeated loading test was carried out on the second floor brackets of the Taihe Temple in the Forbidden City.A 1: 2 scale scale model of the brackets was made and loaded horizontally and longitudinally respectively, The results show that compared with the longitudinal loading, the arch damage is more likely to occur when the arch is loaded laterally. The descending order of the ultimate bearing capacity of each arch is as follows: The longitudinal loads of stigma families and the stigma families are loaded longitudinally. The order of ductility coefficients is as follows: stigma longitudinal load, flat body vertical load, stigma transverse load, angle family load, horizontal body load, and energy dissipation capacity from large to small The order of loading is angle family, lateral load in stigma family, longitudinal load in plain family, longitudinal load in stigma family and horizontal load in plain family. The order of severity degeneracy is horizontal load in horizontal body, horizontal load in stigma family, Section load, body portrait longitudinal load, stigma longitudinal load.Heart Hall two-story horizontal stiffness model of the arch can be simplified into three-fold line segment form.