Seismic design of connection between height-adjustable steel H-section column and foundation

This study proposes an H-section dry support system for water tank foundation as a structural alternative to conventional concrete wet connections, addressing limitations such as extended curing times and limited height adjustability while ensuring seismic capacity. Static lateral loading tests on strong and weak axes of H-section confirmed the system's seismic performance such as strength and ductility, with deformation concentrated at lower joints rather than the column body. Differences in axis performance were linked to varying stress distribution patterns. A 3D finite element (FE) analysis using MIDAS Gen software was conducted on rectangular water tanks under gravity, hydrostatic and design seismic loads, with all evaluated connection arrangements meeting story drift and stability criteria. The system exceeded seismic lateral force requirements for non-structural components and low-rise buildings. It further offers improved maintenance efficiency through easy component replacement and height adjustability, reducing lifecycle costs and enhancing construction efficiency.