Load-carrying Properties Simulation Analysis Of Five Equal Timber Single Span Timber Frame

According to the "Yingzaofashi" in the Song Dynasty,a single span wooden frame model was established by Abaqus.The dynamic analysis of the free vibration and vibration characteristics of the simple harmonic vibration was carried out.The vibration characteristics of the wooden frame under the sinusoidal excitation of different frequencies and different acceleration peaks were studied.The influence of the finch on the bearing performance of the wooden frame was investigated.The relative displacement response of the wooden frame is analyzed by the comparison of the different weights and the free vibration simulation experiments with different initial horizontal displacement.The results show that the amplitude of the free vibration curve shows the attenuation trend,and the relation curve of the period and the amplitude shows that the larger the amplitude,the longer the period is.Through the simulation experiments of sinusoidal excitation with different frequencies and different acceleration peaks,the acceleration response and relative displacement response of the wooden frame are analyzed.The results show that the acceleration time curve of the two parts of the column and the bottom of the column basically coincides with the acceleration peak of the sinusoidal excitation when the input acceleration peak is less sinusoidal.When the value continues to increase to 200 gal,the acceleration time history curve of the top and bottom of the column will no longer coincide,and the phase acceleration curve of the top acceleration will be lagged behind the column bottom.Under the sine excitation of different acceleration peaks,the maximum acceleration of each part of the wooden frame is directly proportional to the peak value of the acceleration of the excitation.Under any operating condition,the maximum acceleration response of the column top and column bottom is greater than that of the bottom plate.With the increase of the peak value of the sine acceleration,the maximum value of the relative displacement of the column and the bottom of the column will be larger in the general trend,the lateral deformation of the wooden frame becomes larger and the increase of the displacement of the column is greater than that of the bottom of the column.High frequency sinusoidal excitation can cause greater displacement reaction in the model,and the maximum displacement reaction occurs in the transient phase.With the increase of the acceleration peak value,the lateral stiffness of the column becomes smaller and smaller.Under the sinusoidal excitation of each frequency,the lateral displacement angles of the largest column frame when they have not collapsed are 1/8,1/8,1/6 and 1/5 respectively,indicating that the structure of the ancient building wood has better deformation performance.The quasi static simulation of single span wooden frame model with no decorated bracket and different weight is simulated.The horizontal pulling tenon,hysteresis,stiffness degradation,skeleton and friction energy dissipation curves are obtained.The restoring force model of single span wooden frame is established.The results show that the structure of the ancient building wood has excellent energy dissipation performance,with the increase of the weight of the top of the column.The seismic performance and energy dissipation of the structure are enhanced,and the hysteresis curves of the two kinds of wooden frames show the effect of kneading,showing the anti Z shape,which shows the characteristics of structural stiffness degradation and slip.When the displacement load is the same,the decorated bracket can better protect the column base and extend the service life of the column base.The presence of decorated bracket can prevent structural deformation and enhance the bending and shear capacity of mortise and tenon joints,making it difficult for the tenon to pull out the holes.The stiffness attenuation of the wooden frame with the decorated bracket is faster.The wooden frame without decorated bracket is more powerful in friction and energy dissipation,and is beneficial to shock absorption and earthquake resistance.