摘要
为研究多维地震作用下地基与结构相互作用系统动力反应的基本规律,进行密肋复合墙结构与地基相互作用系统的模型振动台试验,测试了输入El-Centro波及天津波时地基与结构的加速度及位移反应,观测了地基开裂破坏现象。依据相互作用体系中上部结构的动力反应耦联模式,分析了结构加速度与位移反应耦联效应随高度的变化规律,研究了相互作用体系中结构振动耦联机制。结果表明:随测点高度的增加,加速度耦联效应系数除在顶层发生突变外,其余各测点的值均较为接近,且多数加载工况下位移耦联效应系数随高度的变化不明显;随着输入地震波烈度的提高,地基土先开裂而后略密实,结构顶部动力反应的耦联效应系数先增大后减小,相同烈度不同加载工况对应的值相差在10%以内。由此可见,在地震作用下地基的开裂破坏,导致地基与上部结构的接触发生变化,使结构在多维地震波作用下的动力反应发生耦联。
To study the regulations for dynamic response of interaction system between subsoil and structure affected by multi-dimension earthquake, the shake table model test for the interaction systems was carried out. The acceleration responses and displacement responses were collected excited by El-Centro wave and Tianjin wave, and the crack failures on the subsoil were observed. Based on the dynamic response coupling mode for the structure in the interaction system, the change regulations to the coupling effect for acceleration and displacement with height were analyzed. Also the coupling mechanism of structure vibration in the interaction systems was studied. As results, the acceleration coupling coefficients were similar each other by the adding to the height except for the sudden change at the top floor, and the displacement coupling coefficients do not change obviously under most load cases. With the increase in intensify of the seismic wave, the subsoil was compacted slightly after cracked. The coupling coefficients for dynamic response at the structure’s top increased firstly and then decreased, the difference between the values of the same intensity and different seismic wave is within 10%. Therefore, the cracks of the subsoil make the contact to the structure change affected by earthquake, which lead to the coupling effect to the dynamic response of the structure under multi-dimension earthquakes.
作者
卢俊龙
侯莉娜
张荫
Lu Junlong;Hou Lina;Zhang Yin(School of Civil Engineering and Architecture,Xi'an University of Technology,710048,Xi'an,China;School of CiviJ&Architecture Engineering,Xi'an Technological University,710021,Xi'an,China;School of Civil Engineering,Xi'an University of Architecture and Technology,710055,Xi'an,China)
出处
《应用力学学报》
CAS
CSCD
北大核心
2021年第2期506-514,共9页
Chinese Journal of Applied Mechanics
基金
国家自然科学基金(51178385)
陕西省自然科学基础研究计划项目(2021JM-435)。
关键词
相互作用
密肋复合墙结构
地震反应
振动台试验
振动耦联
interaction
multi-ribbed composite wall structure
seismic response
shaking table test
vibration
