Seismic response of existing stone masonry structures on soft soil foundations

Abstract

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.

Keywords

Stone structure / Soft soil foundation / Soil-structure interaction / Seismic response / LS-DYNA

CRediT authorship contribution statement

Xin Zhao: Writing - review & editing, Writing - original draft, Software, Formal analysis, Data curation, Conceptualization. Haojiang Shang: Writing - original draft, Validation, Supervision, Project administration, Formal analysis. Yingxiong Wu: Writing - review & editing, Supervision, Methodology, Funding acquisition, Conceptualization.

Declaration of competing interest

The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Haojiang Shang are currently employed by Fujian Academy of Building Research Co.,LTD.

Author agreement and acknowledgement

All author agree for this publication, This study is jointly sponsored by Fujian Province construction science and technology development research project ( 2023-B-07 ; 2023-K-47 ; 2022-K-118).

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