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<p>With the rapid pace of urbanization, structural additions and removals within the original structure cluster can significantly alter the dynamic characteristics of the local sites and the seismic responses of the structure cluster, especially in soft soil environments. To address these challenges, this study explores these effects through a series of physical model tests involving eight structure cluster configurations and 54 seismic loading scenarios. The analysis focuses on the dynamic characteristics of central structures, site soil magnification factors, peak acceleration responses, Fourier spectra of acceleration, and total peak acceleration response. Results show that the structure cluster intensifies seismic amplification in shallow soil, with the effect becoming more pronounced under stronger seismic excitations. The spectral content and intensity of the input ground motions also substantially influence soil amplification behavior. Generally, increasing the number of adjacent structures enhances site surface amplification effects, whereas the removal of partial structures may induce attenuation effects, especially under strong seismic excitations. The central structure plays a pivotal role in the transmission, reflection, and scattering of seismic energy due to its location along primary wave paths, exerting a considerable impact on the seismic response of the entire structure cluster. While minor additions of adjacent structures have limited impact on the seismic response of the structure cluster, the removals of specific structures can produce varied and location-dependent effects on adjacent structures. These findings offer critical insights for urban planners and engineers, underscoring the importance of incorporating site-structure cluster interaction (SSCI) considerations into seismic design, retrofitting, and sustainable urban development strategies.</p>

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Experimental investigation of structural additions and removals on the seismic response of building clusters in soft soil

  • 期刊论文

  • 发表日期：

    2026年3月6日

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  • Shuqi Yu,
  • Tong Guo,
  • Heow Pueh Lee,
  • Jing Qian,
  • Jishuai Wang,
  • Zhenyu Du

摘要

With the rapid pace of urbanization, structural additions and removals within the original structure cluster can significantly alter the dynamic characteristics of the local sites and the seismic responses of the structure cluster, especially in soft soil environments. To address these challenges, this study explores these effects through a series of physical model tests involving eight structure cluster configurations and 54 seismic loading scenarios. The analysis focuses on the dynamic characteristics of central structures, site soil magnification factors, peak acceleration responses, Fourier spectra of acceleration, and total peak acceleration response. Results show that the structure cluster intensifies seismic amplification in shallow soil, with the effect becoming more pronounced under stronger seismic excitations. The spectral content and intensity of the input ground motions also substantially influence soil amplification behavior. Generally, increasing the number of adjacent structures enhances site surface amplification effects, whereas the removal of partial structures may induce attenuation effects, especially under strong seismic excitations. The central structure plays a pivotal role in the transmission, reflection, and scattering of seismic energy due to its location along primary wave paths, exerting a considerable impact on the seismic response of the entire structure cluster. While minor additions of adjacent structures have limited impact on the seismic response of the structure cluster, the removals of specific structures can produce varied and location-dependent effects on adjacent structures. These findings offer critical insights for urban planners and engineers, underscoring the importance of incorporating site-structure cluster interaction (SSCI) considerations into seismic design, retrofitting, and sustainable urban development strategies.