钢筋混凝土梁变幅滞回耗能能力衰变规律试验研究

发布时间：2018-11-07 10:43

【摘要】：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。
[Abstract]:In the energy-based structural performance design method, it is necessary to design the capability of the components according to the energy consumption requirements, and understanding the influence of displacement history and reinforcement condition on the hysteretic energy dissipation capacity of the members is the basis of this step. The effects of displacement history, hoop ratio and reinforcement ratio on the hysteresis decay of reinforced concrete beams were analyzed by using steady and arbitrary variable amplitude loads on 22 RC beams. The results show that under constant amplitude hysteretic condition, increasing hoop ratio can delay the decay process of RC beam hysteretic energy dissipation ability, and the effect decreases with the increase of hysteresis amplitude. The change of reinforcement ratio has no effect on the decay process of energy dissipation capacity. Compared with hoop ratio and reinforcement ratio, the amplitude of hysteresis displacement is more obvious and regular. The smaller the amplitude of hysteresis displacement is, the faster the decay to stability is, and the higher the residual energy dissipation capacity is after decay stabilization. Under the variable amplitude hysteretic condition, the energy dissipation capacity of a reinforced concrete beam in a certain semi-hysteretic cycle is determined by the historical maximum displacement and accumulated dissipated hysteretic energy, that is, the hysteretic energy dissipation capacity of reinforced concrete beam is controlled by the maximum historical displacement and cumulative energy dissipation. Based on this dual control law, a method for estimating the amplitude hysteretic energy dissipation capacity of reinforced concrete beams is proposed by quantifying the effects of stirrups and hysteretic displacement amplitudes on the decay of hysteretic energy dissipation capacity of RC beams.
【作者单位】：长沙理工大学土木与建筑学院;
【基金】：国家自然科学基金项目(50908022)
【分类号】：TU375.1;TU317

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