地震荷载作用下地下钢筋混凝土结构损伤破坏模拟研究

Simulation study on damage and failure of underground reinforced concrete structures under seismic load

综合运用钢筋混凝土和土体两种材料非线性本构模型,对某工程实例进行地震破坏的模拟研究。分析结果表明,结构内部在强震作用下产生了混凝土开裂、钢筋屈服等损伤和破坏,通过与采用弹性结构模型的计算结果进行对比,发现采用弹性结构模型虽然可以得到与非线性模型相近的结构位移,但是会显著低估结构内发生的变形,并且无法准确指示结构内部发生损伤的部位。因此,采用非线性结构模型分析地下结构的抗震安全性是非常必要的。

A simulation study on the damage and failure is made for an actual engineering case based on the comprehensive application of the nonlinear constructive models for both the materials of the reinforced concrete and the surrounding soil materials. The analysis result shows that the damages and failures such as the concrete cracking and the yielding of the reinforcement will occur inside of the structures concerned under strong seismic effect. Through the comparison with the result from the calculation made with the elastic structure model, it is found that though the structural displacement close to that got from the nonlinear mod- el can be obtained from the elastic structure model, the deformation occurred inside of the structures will be significantly underes- timated, and then the damaged locations inside of the structures cannot be indicated correctly. Therefore, it is much necessary to adopt the nonlinear structure model for analyzing the seismic safety of the relevant underground structures.