Yifan Wang’s scientific contributions

In accordance with the relevant regulations of Building Method, this paper uses the finite element model to establish a two-column seven-grade dovetail column frame model. 4 kinds of thin cushions are designed with different elasticity and shear modulus at the bottom of the column. The elastic modulus of the cushion is 1/5, 1/10, 1/15, 1/30 of the column frame modulus. A simple harmonic wave with an amplitude of 50 gal and a frequency of 1Hz-2.5Hz was applied to the wooden frame model with cushion and without cushion. There are a total of 20 models and their natural vibration period is obtained and the relative displacement time history curve of the top of the column was extracted to obtain the displacement angle between each model. The results show that: the natural vibration period of the wooden frame with cushion is greater than that without cushion, and the period increases with the decrease of the elastic modulus of the cushion. As the harmonic frequency increases, the layer displacement angle of each wood frame model decreases, and as the cushion modulus decreases, the decreasing amplitude becomes more gentle, indicating that the cushioned wood structure has better resistance to deformation.

In order to study the dynamic response of the damaged timber frame column foot, a four-grade single-span timber frame model with damaged column foot was established to study the frequency change of the timber frame, and the acceleration trend of column top and foot under different frequencies and different peak harmonics were analyzed. The results show that the frequency range of the damaged wooden frame of the column foot is 0.8HZ-2.5HZ. With the increase of the input peak value, the shock absorption effect of the wooden frame under 100gal is obviously better than 50gal. As the elastic modulus of the damaged column foot increases, the shock absorption effect of the wooden frame gradually weakens.

In order to study the seismic performance of ancient timber structures under different earthquake intensities, this paper uses the finite element software ABAQUS to establish a finite element model. Through the incremental dynamic analysis (IDA) of the model under the action of two-way horizontal earthquake, IDA curves of multiple ground motion records are obtained, and the IDA curves of 16%, 50%, and 84% ratio are calculated. Combined with the earthquake vulnerability theory, the earthquake vulnerability matrix is established to evaluate the seismic resistance of the ancient timber structures. It provides a reference for the future anti-seismic research of ancient buildings, and also provides an effective way for timber structure anti-seismic safety evaluation.