钢筋混凝土框架结构直接基于位移的抗震设计

Direct displacement-based seismic design of reinforced concrete frame structures

直接基于位移的抗震设计方法是对基于力的抗震设计方法的重大改进。按此方法进行设计时,需要解决的关键问题是确定结构的目标位移和相应的侧移模式。提出用框架梁节点截面屈服时的位移作为目标位移,并推导了层间屈服位移的计算公式;然后用结构近似的第一振型曲线作为其侧移模式,对层间屈服位移进行修正。算例表明,本方法计算结果合理。

The method of direct displacement-based seismic design is an important improvement on force-based seismic design. The key problem of the method is how to confirm the target displacement and drift mode of the structure in practical applocation. The displacement of the joint section yielding of the beams is regarded as the target displacement, and the calculating formulation of the yield story drift is derived in this paper. The approximate curve of the first vibration mode of the structure is used as the drift mode to modify the yield story drift. The validity of the method is shown by analyzing an 8-story R C frame.