土结相互作用对框架结构倒塌的影响研究

发布时间：2018-06-11 20:23

本文选题：框架结构 + 土结相互作用　；参考：《工程力学》2014年03期

【摘要】：在结构的强震倒塌研究中,结构底部土体的变形会影响上部结构的非线性性能和倒塌机制。该文以一10层钢筋混凝土框架结构为例,利用纤维梁模型模拟梁、柱的非线性反应,并根据ATC-40的土体弹簧模型分别考虑软弱土、中软土、中硬土的影响。分析表明,考虑土结相互作用后,结构顶点位移变大,由此产生的结构侧移会加大结构的整体二阶效应,同时结构的变形明显集中于首层,对结构反应不利;从结构的破坏形态来看,不考虑土结相互作用,结构的破坏始于首层柱底,而考虑土结相互作用后,首层柱顶首先屈服破坏,在上部结构塑性性能未充分发挥前,结构底层发生倒塌破坏,结构的抗倒塌能力降低。
[Abstract]:In the study of strong earthquake collapse, the deformation of soil at the bottom of the structure will affect the nonlinear performance and collapse mechanism of the superstructure. Taking a 10-story reinforced concrete frame structure as an example, the nonlinear response of beams and columns is simulated by using the fiber beam model, and the effects of soft soil, medium soft soil and medium hard soil are considered according to the soil spring model of ATC-40. The analysis shows that considering the interaction of soil junction, the displacement of the structure vertex becomes larger, the resulting lateral displacement of the structure will increase the overall second-order effect of the structure, and the deformation of the structure is obviously concentrated on the first floor, which is unfavorable to the structural response. According to the failure pattern of the structure, the soil junction interaction is not considered, and the structure failure begins at the bottom of the first column, but after the soil junction interaction is considered, the top of the first layer produces the failure first, and before the plastic property of the superstructure is not fully developed, The collapse failure occurs at the bottom of the structure and the anti-collapse ability of the structure is reduced.
【作者单位】：清华大学土木工程系;山东建筑大学土木系;
【基金】：国家自然科学基金项目(51008184,51222804)
【分类号】：TU375.4;TU311.3

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