钢筋混凝土框架结构目标侧移的确定方法

在直接基于位移的抗震设计中，需确定结构各楼画处的目标侧移。本文根据钢筋混凝土框架结构的特点，推导了层间屈服位移的计算公式；用作用倒三角形分布荷载的等截面剪切悬臂杆的侧移曲线作为框架结构的侧移模式；假定框架结构某一层或几层达到某一极限状态，求出相应的楼面处的侧移，再根据侧移模式计算各楼而处的侧移。按本文方法确定的结构侧移曲线比较符合实际情况。

Determination Method of Target Lateral Displacement of RC Frame Structure

in direct displacement-based seismic design of buildings, the target lateral displacement on floors should be determined. According to the characteristics of RC frame structure, the calculating formulation of the story yield drift is derived in this paper. Applying the inverted triangular distribution of lateral force to the cantilever column with identical section, its displaced shape is regarded as the initial lateral displacement mode. Assuming that several stories of the frame structure achieve the limit state, the lateral displacement on the corresponding floor is calculated and then lateral displacement on other floors are determined according to its lateral displacement mode. It is shown that the lateral displacement curve accords with the demands.