软土地基上既有石砌体结构的地震反应

Xin Zhao , Haojiang Shang , Yingxiong Wu
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引用次数: 0

摘要

福建沿海地区有许多现存的石砌体结构,其中许多建在软土地基上。已有研究表明,软土地基的土-结构相互作用(SSI)效应可以延长结构的自振周期,增强结构的地震响应。利用LS-DYNA有限元软件建立了土-结构相互作用系统模型和比较刚性基础模型,研究了SSI对石质结构动力特性和地震反应的影响。结果表明,SSI效应改变了石质结构的动力性能和地震反应。这种变化在延长的自振周期中表现明显,降低了整体刚度,增加了层间位移角,并略微降低了加速度响应。在SSI体系和FIX体系下,结构破坏模式均以二层石墙外塌为特征,二层石墙外塌导致屋顶石板失去支撑而坠落,导致整体倒塌。FIX体系具有较好的结构完整性和稳定性,裂缝发展速度较慢。相比之下,SSI系统的裂缝出现得更早,发展得更快,造成的破坏更严重。研究结果为软土地基上既有石质结构的抗震加固提供了理论依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Seismic response of existing stone masonry structures on soft soil foundations
The coastal region of Fujian contains numerous existing stone masonry structures, many of which are constructed on soft soil sites. Previous studies have shown that the soil-structure interaction (SSI) effect on soft soil foundations can prolong the structure's natural vibration period and enhance its seismic response. We develops a soil-structure interaction system model and a comparative rigid foundation model using the finite element software LS-DYNA to investigate the impact of SSI on the dynamic characteristics and seismic response of stone structures. The results indicate that the SSI effect alters stone structures' dynamic properties and seismic response. This alteration is evident in the extended natural vibration period, which reduces overall stiffness, increases interstory displacement angles, and slightly decreases the acceleration response. Under both SSI and FIX systems, the structural failure mode is characterized by the external collapse of the second-story stone walls, which causes the roof stone slabs to lose support and fall, leading to overall collapse. The FIX system demonstrates better structural integrity and stability with slower crack development. In contrast, the SSI system exhibits cracks that appear earlier and develop more rapidly, causing more severe damage. The research findings provide a theoretical basis for the seismic reinforcement of existing stone structures on soft soil foundations.
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