钢框架结构基于能量的塑性设计方法

Study of energy-based plastic design method on steel frame structures

以"强柱弱梁"的屈服机理为前提,结合建筑抗震设计规范和能量平衡原理得到结构的基底剪力和各楼层的剪力,提出钢框架结构基于能量的塑性设计方法。该方法还需预先确定结构在罕遇地震下的目标位移和耗能折减系数η,并通过塑性设计法对各构件进行设计。利用Perform-3D软件对所设计结构进行非线性动力时程分析。研究结果表明:该方法可设计不同抗震设防烈度下的钢框架结构,且无需进行复杂的计算和迭代,就能使结构满足多遇及罕遇地震下的预定功能。

The energy-based plastic design method of steel frame structures was proposed based on the ‘strong column weak beam’ energy dissipation and yield mechanism under the inelastic seismic behaviors. The base shear and lateral force distribution were derived from modified energy balance equation and the code for seismic design of buildings. Moreover, the pre-selected target drift and the reduced energy dissipation coefficient η were also important to the proposed method, and all the elements were obtained by plastic design method. Nonlinear dynamic time-history analysis was carried out by Perform-3D. The results show that the frames with different seismic precautionary intensities designed by the proposed method can exhibit expected functions during frequent and rare earthquake without complicated iteration and calculation.