Design method of simplified dynamic test model for high-rise building with underground structures considering nonlinear behavior similarity

• Published in: Engineering structures 2025-01, Vol.322, p.119221, Article 119221
• Main Authors: Wang, Rui, Dong, Zhi-Qian, Li, Gang, Yu, Ding-Hao, Cui, Yao-Zhong, Zhang, Han, Li, Jia-Long
• Format: Article
• Language: English
• Subjects: High-rise building with underground structures; High-rise structure; Model test; Nonlinear simplified model; Shaking table test; Small-scale model
• ISSN: 0141-0296
• DOI: 10.1016/j.engstruct.2024.119221

Model tests are widely implemented in the seismic performance analysis of engineering structures. In studies of shaking table tests on high-rise building with underground structures (HBUSs), it is essential to adequately consider both the soil-structure interaction (SSI) effect and structural nonlinear behavior. However, the challenge of accurately considering the similarity of nonlinear behavior between small-scale test model and prototype structure in SSI tests is raised due to the limitations in experimental materials and model processing. In this paper, a design method for dynamic test models of HBUSs considering nonlinear behavior similarity was proposed. Micro-concrete materials were utilized to construct the lower structure which subjected to complex forces. Besides, for the upper high-rise structures, which is characterized by clear force mechanisms and difficulty in producing small component sizes, were replaced by nonlinear simplified models (NSMs). The NSMs model disassembled the flexural-shear restoring force model for simulated high-rise structures into a combination of linear and nonlinear behavior. The nonlinear behavior was simulated by the Coulomb friction model, which can be directly implemented in model tests. A dynamic small-scale tests and a calculation method for parameters such as equivalent stiffness, post-yield stiffness and bearing capacity were proposed by combing the flexural-shear model with the translation-rotation friction device. This established the mechanical calculation model of the NSMs. The accuracy and feasibility of the method were validated by numerical simulations and shaking table tests on a typical high-rise structure. •A design method for small-scale ratio test models of high-rise building with underground structures is proposed.•A simplified dynamic test model for high-rise structures considering nonlinear behavior similarity is established.•The design flows and parameter calculation methods for the NSM is proposed.•The accuracy and feasibility of the NSM are validated through numerical simulation and shaking table test.