本研究旨在探討中空鋼管柱與混凝土填充鋼管柱在受火害下之耐震行為差異。研究採用有限元素軟體ANSYS，建構於已獲驗證之常溫基礎模型上，進行熱-力耦合之非線性分析。試體參數涵蓋有無混凝土填充以及三種不同之鋼管寬厚比，厚度分別為19 mm、16 mm與12 mm。分析流程首先於柱體相鄰之其中兩面施加500°C高溫火害，隨後在0.3 Pn之固定軸壓下進行反覆側推試驗，探討各試體之遲滯迴圈、von Mises 應力與等效塑性應變（PEEQ）分佈。
研究結果顯示，中空鋼管柱在火害下，於層間變位角1.5%至2.0%時即發生嚴重的局部挫屈而提早破壞。反之，填充混凝土之試體皆能穩定完成4%變位角之側推加載，其最大彎矩值較中空試體大幅提升2.7至2.9倍。核心混凝土雖然在加載初期即產生塑性損傷，但成功發揮了犧牲保護與面外支撐之機制，有效防止外層鋼管提早崩壞。此外，較小的寬厚比能延緩中空鋼管柱的挫屈時間；而在混凝土填充鋼管柱中，寬厚比則主要影響內部混凝土的損傷程度與遲滯迴圈的束縮現象。

This study aims to investigate the differences in seismic behavior between hollow steel tube columns and concrete-filled steel tubublar (CFTC) columns under fire exposure. Using the finite element software ANSYS, nonlinear thermal-mechanical coupled analyses were conducted based on a validated ambient-temperature base model. The specimen parameters include the presence or absence of concrete infill and three different steel tube width-to-thickness ratios, with thicknesses of 19 mm, 16 mm, and 12 mm. The analysis procedure first applied a 500°C high-temperature fire exposure to two adjacent faces of the columns, followed by a cyclic lateral pushover test under a constant axial load of 0.3 Pn. The hysteretic loops, von Mises stress, and equivalent plastic strain (PEEQ) distributions of each specimen were then investigated.
The research results show that under fire exposure, the hollow steel tube columns experienced severe local buckling and premature failure at story drift ratios ranging from 1.5% to 2.0%. Conversely, the concrete-filled specimens stably completed the lateral cyclic loading up to a 4% drift ratio, with their maximum bending moments significantly increasing by 2.7 to 2.9 times compared to the hollow specimens. Although the core concrete sustained plastic damage in the early loading stages, it successfully provided sacrificial protection and out-of-plane support mechanisms, effectively preventing the premature collapse of the outer steel tube. Furthermore, a smaller width-to-thickness ratio delayed the buckling onset in the hollow steel tube columns; in the CFTC columns, the width-to-thickness ratio primarily affected the degree of internal concrete damage and the pinching phenomenon of the hysteretic loops.

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