Experimental research on cross-laminated timber structure with dual energy dissipation connections through shaking table tests
In order to investigate the seismic performance of cross-laminated timber(CLT)structure with connections using a dual energy dissipation mechanism combining mild steel yield and rubber shear,a comprehensive shaking table test was conducted on two full-scale models of benchmark model and bottom multi-door aperture model.Considering the influence of near earthquake and far earthquake,and site characteristics,El Centro,Wenchuan and Shanghai Artificial Wave No.2 were selected for the test.The peak ground acceleration(PGA)gradually increased from 0.035g to 0.80g,on the basis of which the dynamic characteristics and seismic response of the two models were examined.The results indicate that the basic frequencies of the benchmark model and bottom multi-door aperture model are 4.125 Hz and 3.625 Hz.The vibration modes of the two models do not change significantly before the 8-degree semi-rare(PGA is0.51g)test,and the fundamental frequency only decreases by about 5％,indicating that the models have only slight damage before,which verifies the good energy dissipation effect of the energy dissipation connections.After the test of ground peak acceleration of 0.80g,the maximum inter-story displacement angle of the bottom multi-door aperture model is 1/60,and the damage is concentrated on the mild steel yielding of the energy dissipation connection.The structural damping ratio is 13％,which achieves the goal of replaceable connection and repairable structure under a 9-degree rare earthquake.In addition,the shape of the shear-gravity ratio-roof displacement curves of the two models under different seismic wave excitations is similar.The bottom multi-door aperture model under the El Centro wave excitation with a peak acceleration of 0.80g,the maximum roof displacement is close to 100 mm,and the base shear weight ratio is about 1.80,but it still maintains a strong elastic deformation capacity.
cross-laminated timber structuredual energy dissipation connectionshaking table testdynamic characteristicseismic performance
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