非一致地震波动输入下大型钢筋混凝土框架结构-地基体系地震响应规律

为探索非一致地震波动输入对大型钢筋混凝土框架结构地震响应的影响,基于OpenSees软件平台建立二维钢筋混凝土框架结构\|地基动力相互作用有限元模型。将El-Centro地震波按P波波形分别以0°、15°、30°和35°角入射该有限元模型进行计算,对比分析框架柱内力和楼层层间位移的地震响应。研究发现非一致地震波输入方法对于大型钢筋混凝土框架结构建筑动力响应影响明显,随着地震波入射角的增大,钢筋混凝土框架结构底层柱的轴力幅值减小,剪力幅值增大,而弯矩幅值变化较小,楼层层间位移幅值也随之增大。研究结果对于大型钢筋混凝土框架结构抗震设计具有参考意义。

Seismic response of a large reinforced concrete frame structure-foundation system under nonuniform earthquake wave input

To explore the influence of nonuniform seismic wave input on the seismic response of reinforced concrete (RC) structures, a large 2D finite element model for the dynamic interaction between an RC frame structure and a foundation was built based on the OpenSees software platform. Numerical calculations of the RC frame structure were performed by inputting El-Centro seismic waves at incidence angles of 0°, 15°, 30°, and 35°. The internal forces of the frame columns and the story drifts of the structure were compared and analyzed. The results showed that the nonuniform seismic wave input method has an evident influence on the dynamic response of large-scale RC frame structures. With the increase in the incidence angle of the seismic wave, the axial force amplitude of the bottom column of the RC frame structure decreased while the shear force amplitude increased. The bending moment amplitude changed only slightly, and the amplitude of the story drifts increased. The research results have reference significance for the seismic design of large RC frame structures.