SEISMIC DESIGN OF SPLIT-FOUNDATION RC FRAMES WITH UPPER BASE ISOLATION
Volume Title: ICASGE2025
Paper ID : 1082-ICASGE-FULL
Authors
Xihua University
Abstract
A split-foundation RC frame structure is a common layout in mountainous and hilly areas, characterized by inherent irregular grounding properties that can lead to significant damage during strong earthquakes. This is particularly true when the irregularity in the lower floors is severe, as the deformation of the structure is primarily influenced by the upper grounding components of the base floor. In such cases, the upper grounding columns are often subjected to excessive reinforcement demands. Improving the overall seismic performance of the structure by controlling the deformation of the upper grounding floor is often economically challenging. To address this, the present study proposes a design approach that reduces the lateral base constraints of the upper grounding components. By incorporating sliding bearings or isolation bearings at the bottom of the upper grounding columns, the approach enhances the overall seismic performance, helps avoid serious damage, and preserves vertical load-bearing capacity. This method ultimately improves the structure’s resilience, reducing the risk of local or total collapse during an earthquake.
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