本研究針對中空複合構件於三維載重下之承載行為進行探討，主要探討參數為斷面深寬比、三維載重大小與是否配置斜拉鋼筋，研究中針對22根中空複合構件進行組合反覆載重試驗，以評估此類構件之耐震性能。 研究結果顯示，試體於三維載重下，因側向彎矩作用，試體之勁度、極限強度及能量消散皆有顯著衰減，研究中除針對三維載重下之強度互制關係提供建議公式，亦針對斜拉鋼筋應用於複合構件承載性能提升之可行性進行探討。試驗結果證實，斜拉鋼筋不僅對試體抗扭能力有所提升，其對構件在組合載重下之極限後強度與勁度的維持，以及能量消散皆有顯著的貢獻，此顯示斜拉鋼筋應用於中空複合構件耐震設計具有相當之可行性。 This study investigated the performance of hollow composite members, and the possibility of cross inclined bars in performance improvement for members subjected to earthquake-induced loads. A series of tests on composite members subjected to bending and torsion were conducted. Major parameters studied included the sectional aspect ratios, magnitudes of three-dimensional loads and the placement of cross inclined bars. The test results obtained from the combined load tests were used to define the relationship among member performance, sectional aspect ratios, and the load combinations. The test results showed that the bearing capacity of members significantly decreased when members were under three-dimensional loads. Comparisons of test results also showed that the stiffness and ductility of the strengthened members were significantly increased. Enhancement in energy dissipation further validated the applicability of inclined bars to the performance improvement of hollow composite members.