Dynamic Response Analysis Of The Seven-level's Timber Frame Under Basic Harmonic Loads

In some special environments,ancient structures with wooden structures may suffer from simple harmonic stimulation,affecting their normal use and even causing unpredictable damage.Therefore,it is of great significance to study the dynamic response of wood-structured buildings under the action of harmonic excitation to protect ancient buildings.According to the Caifen hierarchy system in the Ying-zao-fa-shi,this paper establishes the wooden frame without Dou Gong and the wooden frame with Dou Gong in the ABAQUS finite element software,finite element simulation analysis of dynamic characteristics and dynamic response of harmonic excitation are respectively performed.The dynamic characteristics of the wooden frame without Dou Gong and the wooden frame with Dou Gong were simulated under different additional weight.The influence of the presence and absence of Dou Gong on the natural vibration period of the wooden frame model was analyzed and compared.The results show that the natural vibration period of the two wooden frames increases with the increase of the additional vertical weight,and increases withthe increase of the seismic intensity of the bottom plate input;the natural vibration period of the wooden frame with Dou Gong is slightly larger than the the natural vibration period of the wooden frame without Dou Gong.The simulation analysis of the dynamic response under simple harmonic excitation is carried out for the wooden frame model without Dou Gong under different vertical weights.The change trend of the displacement response of the wooden frame model is obtained,and the influence of the harmonic amplitude on the resonance of the timber frame was analyzed.The results show that the relative displacement peak value of the top and bottom of the wooden frame and the relative displacement amplitude of the steady-state vibration increase with the increase of the amplitude of the harmonic harmonics;Harmonic acceleration amplitude affects the time for the wooden frame to enter the steady state vibration;the excitation frequency that causes the resonance of the wooden frame is related to the amplitude of the harmonic wave acceleration.When the amplitude of the harmonic wave acceleration increases to a certain extent,the sub-harmonic resonance of the wooden frame will be caused.The simulation analysis of the dynamic response under the simple harmonic excitation is carried out on the wooden frame model without Dou Gong,and the changing trend of the displacement response at each level is obtained.The influence of the harmonic amplitude on the resonant response of the wooden frame is analyzed.The results show that the displacement response of the wooden frame mainly occurs in the pillar layer,and the displacementresponse of the Puzuo layer is very small;the lateral shift angles of the Puzuo layer and the lateral angles of the pillar layer increase with the amplitude of the harmonic acceleration.and the lateral shift angle of the Puzuo layer is smaller than the lateral shift angle of the pillar layer;the excitation frequency causing the resonance of the wooden frame is related to the acceleration amplitude of the harmonic wave.