Study on seismic performance of bottom frame of Dong nationality wooden drum tower
In order to study the seismic performance of Dong nationality wooden drum tower,based on an example of fir structure drum tower,taking its bottom frame,two single-span fir frame scale models were designed and manufactured.Through low-cycle reciprocating horizontal load test and finite element numerical simulation,the hysteretic performance,stiffness degradation law,deformation and other mechanical properties of the wooden frame were analyzed,and the energy dissipation mechanism of the wooden frame was quantitatively analyzed from the energy point of view.The results show that under the action of horizontal repeated load,the hysteresis curve of the wooden frame is in the shape of inverse Z,and there is pinching phenomenon.The area of hysteresis loop increases gradually,and the energy consumption of the wooden frame also increases.The lateral stiffness of the wooden frame is seriously degraded,and the degradation rate is fast at the initial stage of loading.When the ultimate displacement is reached,the stiffness is only 32％of the initial stiffness.The deformation capacity of the wooden frame is good,and it is easy to tilt as a whole.When the horizontal displacement of the top of the column reaches 20mm,the column foot begins to rise and slip horizontally,and the tenon and mortise appear extrusion and de-tenoning.The wooden frame mainly consumes energy through hysteretic energy,and the maximum energy consumption of hysteretic energy can reach 80％.The greater the friction coefficient between the tenon and the mortise,the greater the ultimate horizontal bearing capacity of the wooden frame.
NETL
NSTL
万方数据
