| The frame type of Tibetan-style Architecture is characterized by flat roof with multi-beam. The structure is composed of stone wall, timber beam, timber column, timber rafter and cobble floor. Many large palaces and Temples have been well-preserved after hundreds of years. It is a telling witness of structure durability. However, the bearing capacity and stability of structure have been decreased by earthquake, erosion and material decoration. It is a threat to structural safety of Tibetan ancient architecture.In this paper, the structural property and typical damage types of Tibetan ancient architecture have been summarized based on fieldwork. In addition, the load transfer mechanism and damage reasons have been explained preliminarily in theory.We have completed a mechanic test of Tibetan Cathay Poplar and Tibetan Plateau Pine. We have also analyzed and compared the results in detail. Degradation laws of old timber and variability of sample indexes are obtained, which provide some theoretical reference for material parameter selection of Tibetan ancient architecture.The finite element model of a type of typical beam-column joint is set up and the mechanic properties and failure mode are gotten. The effects of gongmu's length and queti's skew on the joints' stress state are analyzed. In addition, mechanic function of anxiao is analyzed.The simplified FEM model of beam-column connection which includes 3-D spring elements is gotten. Moreover, the two stiffness parameters reflecting connection property are obtained by numerical simulation method. At the end, taking a typical structure frame for example, the effects of two parameters on structure's natural vibration characteristics are analyzed. It can provide some reference for modeling in dynamic anlysis.
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