Experimental Study And Numerical Analysis Of Seismic Performance Of Brackets Sets Of A Wooden Pagoda

The ancient wood architectural heritage inherits a long-standing culture and is the most important type of immovable cultural relics in China.The ancient wood building heritage has long been subjected to wind load and has also undergone a certain degree of earthquake test.Its internal force characteristics and force transmission mechanism are the key cores for revealing its standing for thousands of years,and it is an important basis for its safety performance evaluation and improvement.Brackets sets is an important bearing member and energy-consuming member in the ancient wooden building heritage.Its damage evolution mechanism and energy-consuming mechanism are one of the key issues in understanding the disaster prevention capability of ancient wood building heritage.This paper takes the typical brackets sets in the ancient wood building heritage of Liao and Song Dynasties as the research object,comprehensively considers the various brackets sets building construction methods and stress characteristics,sorts out the typical brackets sets classification and its key variables,and establishes a database of existing brackets sets experiments.The similarities and differences of the various types of brackets sets behaviors and the key parameters affecting their behavior are clarified.On this basis,for the brackets sets with Ang that have not been fully researched yet,the seismic performance test of full-scale specimens is carried out based on a wooden tower,and the behavior and energy consumption characteristics of the rafts are clarified.Aiming at the energy consumption capability simulation requirements of the brackets sets,a general simplified hysteresis model suitable for different types of brackets sets is proposed,which can accurately reflect the hysteretic energy consumption characteristics and establish a simplified model library with existing brackets sets.The main research contents and conclusions of this paper include:(1)A database of seismic performance tests for four typical types of brackets sets was established,including 27 tests.The test data were compared and analyzed,and the hysteretic energy characteristics and key influencing factors of different types of brawls were identified,the results show:(1)Zhutou Puzuo and Bujiuan Puzuo exhibited similar hysteretic characteristics.With the increase of numbers of tiao,the hysteretic curve become fuller;(2)The hysteretic curve of Chazhuzaotou Puzuo exhibited significant pinching phenomenon,a more significant pinching phenomenon is observed for the hysteretic curves when the load is applied in the Huagong direction rather than the Nidaogong direction;(4)The hysteretic curve of the Zhuanjiao puzuo is the fullest.(2)Taking the brackets sets on second floor cave column as a research object,made a full-scale model,and carried out a horizontal low-cycle reciprocating loading test,Under the horizontal load,the brackets sets model shows the deformation characteristics of the rotation around Ludou which is the bottom of the brackets sets.Due to the presence of the Ang member,the upper member of the brackets sets model is separated from the lower member,and the upper member shows a slip phenomenon during the loading process,but The overall structure of the bucket is still showing good integrity,and no obvious cracks are formed ineach component.Tests show that the brackets sets model has good seismic performance and energy consumption.(3)A simplified model for different types of brackets sets nodes is proposed,which is verified by the existing experimental model,and key model parameters are proposed for different types of bucket nodes,for 4 layers Zhutou Puzuo.BujianPuzuo and Zhutou Puzuo with Ang,it is recommended to take pinchX and pinchY as 0.45 and 0.55,fou Chazhuzao Zhutou Puzuo,it is recommended to take pinchX and pinchY as 0.7 and 0.2 for the huagong direction,0.6 and 0.3 for the nidaogong direction,for Zhuanjiao Puzuo,it is recommended to take pinchX and pinchY as 0.4 and 0.6,the results show that the model can simulate the hysteretic energy and total plastic energy consumption of different forms of brackets sets.