钢筋混凝土框架-联肢剪力墙结构的地震能量分布研究

基于能量抗震设计需解决的一个重要问题是确定结构累积滞回耗能的分布。该文通过两个具有不同跨高比连梁的钢筋混凝土框架-联肢剪力墙结构,选用一定数量的地震波进行弹塑性动力时程分析,研究了框架-联肢剪力墙结构在地震作用下的累积滞回耗能分配和分布规律。分析研究结果表明:当连梁跨高比合适,可以实现强墙弱(连)梁的屈服模式,连梁可以承担绝大部分耗能,框架梁也可以承担部分耗能,从而降低墙肢的耗能比例,减轻墙肢损伤程度。同时,不同频谱特性地震波虽然不会影响结构中各构件的耗能比例分配,但是会影响各构件的耗能分布模式,因此在确定各构件的层耗能需求时,需要考虑不同耗能分布模式的影响。

STUDY ON DISTRIBUTION OF CUMULATIVE HYSTERETIC ENERGY IN REINFORCED CONCRETE FRAME-COUPLED SHEAR WALL

The distribution of cumulative hysteretic energy (EH) is a key issue in the structural energy-based seismic design. Two reinforced concrete frame-coupled shear walls with different span-depth ratios in coupling beams were designed and then analyzed by inelastic time-history analysis method under some earthquake records. The distribution of EH among wall limbs、coupling beams and frames are studied, as well as the distribution of EH along different stories. The results show that when the span-depth ratio of the coupling beam is reasonable, the "strong wall limb-weak coupling beam" mode can be achieved and most cumulative hysteretic energy is dissipated by the coupling beam while the damage in the wall limb can be decreased significantly. Besides, the results show that although the distributions of EH among different structural members are steady under the earthquake records with different spectrum characteristics, the distribution of EH along the stories may vary significantly. So the difference in EH distribution along the stories must be considered to determine the energy demands of the structural members in different stories.