由於複合柱擁有優異的力學性能，且國內鋼管生產技術與設備的提升，混凝土填充鋼管柱將成為未來中高層建築的重點使用構材。因此，本研究將針對無填充混凝土鋼管柱與混凝土填充鋼管柱，透過有限元素模擬分析評估其耐震性能。具體而言，本研究先以較多人研究的箱型柱文獻做為有限元素分析的驗證，之後設計5支不同柱體進行模擬分析，包含2支空心鋼管柱與3支混凝土填充鋼管柱，進行固定軸壓下的反覆側向位移耐震試驗。
本研究設計之柱體寬厚比數值皆較大，在AISC規範與國內鋼結構設計規範中，空心鋼管柱皆屬於細長肢材，模擬結果顯示，較大寬厚比的柱體在未填充混凝土的情況下，無法完成側位移4%的試驗，在試驗中途即出現嚴重局部挫屈並出現超出參數設定之奇異點，使分析發散無法收斂，而從遲滯迴圈中也可發現其強度已大幅下降至趨近於0。
另一方面，混凝土填充鋼管柱不僅可完成層間變位角4%之試驗，且兩個迴圈完成時柱體強度仍可超過標稱彎矩的80%，符合鋼結構設計規範耐震要求，而鋼管的厚度會大幅影響遲滯迴圈的飽滿程度，厚度較小的鋼管雖有足夠的強度，但與較厚的鋼管相比遲滯迴圈卻消瘦許多。在局部挫屈方面，混凝土的填充可有效防止鋼管產生局部挫屈，且有了混凝土做內部支撐，產生局部挫屈的位置也發生改變，使其發生處更靠近柱端。

Concrete-filled steel tubular columns (CFTC) combine the strengths of steel and concrete, offering excellent mechanical performance. With advancements in domestic steel tube manufacturing, CFTCs are expected to become key components in mid- to high-rise buildings. This study investigates the seismic behavior of hollow steel tubular columns and CFTCs through finite element analysis. A validated box-section model was used first, followed by simulations of five column specimens—two hollow and three filled—under constant axial load and cyclic lateral displacement.
All specimens had large width-to-thickness ratios, classifying the hollow tubes as slender members. The analysis showed that without concrete, the hollow columns failed before reaching 4% drift, exhibiting severe local buckling and convergence issues. In contrast, the CFTCs completed the tests with residual strength exceeding 80% of nominal capacity, meeting seismic code requirements. Tube thickness influenced the hysteresis loop shape, and concrete infill helped prevent and shift local buckling locations.

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