自控耗能UPPC框架梁在竖向振动荷载下的性能试验研究

Investigation on the performance of the self-adapting energy UPPC frames beam loaded by vertical vibrate load

自控耗能UPPC框架梁的主要特点是在梁中设置合理的自控元件来调减竖向振动作用下无粘结预应力筋的应力,促使UPPC框架结构在竖向振动荷载下实现梁铰侧移机制。通过低周反复荷载试验,研究自控耗能UPPC框架梁的抵抗动荷载的性能。研究表明:与普通UPPC梁相比,自控耗能UPPC梁的位移延性更好,具有较好的抗振动性能;增大综合配筋指数和预应力度对自控耗能UPPC梁性能不利;自控耗能UPPC梁在同一控制位移等级下的耗能值和耗能系数大于相同配筋的普通UPPC梁。因此自控耗能UPPC框架在碰到竖向振动时形成梁铰机制是具有可行性的。

The main characteristic of self-adapting energy UPPC frame beams is setting reasonable self-command element in beams to change or reduce the stress in prestressing tendons under vertical vibrate forces and form the beam-hinge sidesway mechanism in UPPC frames under rare vibration.The low cyclic reversed loading test is carried out to investigate the performance of self-adapting energy UPPC frames.The test results show that the self-adapting energy UPPC beam is better than the common UPPC beams in displacement ductility and anti-vibration performance;whereas the performance of the self-adapting energy UPPC beam is decreased with the increase of comprehensive reinforced index and degree of pre-stress,under same controlling displacement,the energy dissipation value and coefficient of the self-adapting energy UPPC beam are larger than that of a common UPPC beam with same reinforcement ratio.Therefore it is feasible to form beam-hinge mechanism when the self-adapting energy UPPC Frames are in the action of the rare vertical vibrate forces.