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为了研究“底部架空、上部出挑”结构的地震扭转反应,通过理论分析,肯定了扭转位移比作为控制结构发生扭转脆性破坏控制指标的有效性。扭转周期比作为规范规定的另一个扭转振动效应的控制指标,对于“底部架空、上部出挑”结构而言,扭转周期比指标的有效性存在问题。通过理论推理,分析了此类结构扭转周期比超限的根本原因。结果表明,利用扭转周期比控制此类结构的扭转振动不尽合理,本文从抗震概念设计、能量原理的角度对“底部架空、上部出挑”结构的抗扭设计方法及控制措施进行了初步分析,以期对后续深入研究工作的开展打下基础。
In order to study the seismic torsional response of “overhead overhead and upper overhang” structures, the theoretical analysis shows that the torsional displacement ratio is valid as a control index for controlling the structure to reverse the brittle failure. Torsion cycle is a control measure for another torsional vibration effect as specified in the code and there is a problem with the validity of the torsion cycle over the indicator for a “bottom overhead, top pick-up” structure. Through theoretical reasoning, the root cause of the torsional cycle ratio overrun of such structures is analyzed. The results show that it is not reasonable to use the torsional period to control the torsional vibration of such structures. This paper presents a preliminary study of the torsional design method and control measures of “overhead overhead and overhanging” structures from the concept of seismic design and energy principle Analysis, with a view to laying the foundation for the follow-up in-depth research.