Study on torsional damage and its mitigation in super high-rise RC frame-core tube structures

Yingchang Ma , Zheng He , Xiao Lai

Abstract

To mitigate torsional failures in frame-core tube structures, the torsional damage mechanism is investigated through a multi-level analysis encompassing structural components, subsystems, and the overall system. The influence of key structural parameters on torsional resistance is analyzed to identify critical contributors to structural vulnerability. Realistic torsional components of ground motions are generated using a single-station method combined with an empirical phase velocity model, and applied to ground motion records selected based on the conditional mean spectrum. A systematic comparison is conducted to evaluate post-earthquake dynamic characteristics, story torsion angles, inter-story torsion angles, and internal force distributions. Incremental dynamic analysis is employed to assess how these parameters vary with increasing seismic intensity. The results indicate that higher-order torsional modes are more readily activated as the height-to-width ratio increases, resulting in more severe damage. Strengthened stories significantly reduce the amplitude of higher-order torsional vibrations and help control nonlinear responses. Additionally, torque in the core tube increases with seismic intensity and exhibits high sensitivity. Corner columns in the frame are especially vulnerable to damage under torsional excitation.

Key Words

frame-core tube structure; incremental dynamic analysis; structural parameters; torsional component; torsional damage mechanism

Address

Yingchang Ma, Xiao Lai — Department of Civil Engineering, Dalian University of Technology, Dalian 116024, China
Zheng He — 1) Department of Civil Engineering, Dalian University of Technology, Dalian 116024, China, 2) State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China

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