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在基于能量的结构性能设计方法中,需要根据耗能需求对构件进行能力设计,而了解位移历程和配筋状况对构件滞回耗能能力的影响规律是实现这一步骤的基础。通过对22根钢筋混凝土梁试件分别采用稳态变幅加载和任意变幅加载,分析位移历程、配箍率和配筋率的变化对钢筋混凝土梁滞回衰变规律的影响。研究表明,常幅滞回条件下,增加配箍率能够延缓钢筋混凝土梁滞回耗能能力的衰变过程,其延缓效果随滞回幅值的增大而降低;配筋率的变化对构件耗能能力的衰变过程未见规律性的影响;相对于配箍率与配筋率,滞回位移幅值的影响更为明显且更具规律性,滞回位移幅值越小,构件衰变至稳定的过程会更快,而衰变稳定后的残余耗能能力将更高。变幅滞回条件下,钢筋混凝土梁在某个半滞回的耗能能力决定于历史最大位移和已累积耗散的滞回能量,即钢筋混凝土梁的滞回耗能能力受最大历史位移和累积耗能的双控。基于这一双控规律,通过量化箍筋与滞回位移幅值对构件滞回耗能能力衰变的影响,提出了钢筋混凝土梁变幅滞回耗能能力的估计方法。
In energy-based structural performance design, it is necessary to design capability of components according to energy consumption requirements. Understanding the influence of displacement history and reinforcement condition on energy dissipation capacity of components hysteresis is the basis of this step. The influence of displacement history, stirrup ratio and reinforcement ratio on the law of hysteretic failure of reinforced concrete beams was analyzed by using steady-state luffing loading and arbitrary luffing loading on 22 specimens of reinforced concrete beams respectively. The results show that under the condition of constant amplitude hysteresis, increasing the stirrup ratio can delay the decay process of the energy dissipation capacity of the reinforced concrete beam, and the retarding effect decreases with the increase of the hysteresis amplitude. The change of the reinforcement ratio affects the component consumption The decay process has no regularity. Compared with the ratio of stirrup and reinforcement ratio, the influence of hysteresis displacement amplitude is more obvious and regular. The smaller the amplitude of hysteresis displacement, the decay of the components to the stable The process will be faster, and the stability of decay after the residual energy consumption will be higher. Under hysteresis of hysteresis, the energy dissipation capacity of a reinforced concrete beam in a certain semi-hysteresis is determined by the maximum displacement history and the cumulative dissipated hysteretic energy. That is, the hysteretic energy dissipation capacity of a reinforced concrete beam is affected by the maximum historical displacement and Double energy accumulation control. Based on the dual-control law, the method of estimating the energy dissipation capacity of RC beams with hysteresis is proposed by quantifying the influence of amplitude of stirrup and hysteresis on energy dissipation of hysteretic members.