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F i r e res is tance of concrete-f i l led s t e e l tubular columns is greater than t h a t of un f i l l ed members. But it is required t o apply spray f i r e protection t o the same thickness a s f o r non composite steel s t ruc tu res under t h e present regula t ions i n Japan. I t has been t r i e d t o make c l e a r t h e f i r e r e s i s t ance of concrete-f i l led steel tubular columns under pure compression but t he columns must su f fe r t he l a rge bending def lec t ion according t o thermal elongation of beams exposed to f i r e . In t h i s study it is t r i e d t o analyze t h e l o s s of load bearing capacity about c o n c r e t e f i l l e d steel tubular columns under bending deformation and a x i a l fo rce i n f i r e . I t is cleared t h a t t h e l o s s of t h e load bearing capacity is due t o concrete cracking a t inner p a r t of column sect ion induced by thermal expansion a t mounting p a r t of column sect ion.

Numerical Analysis Of Load Bearing Capacity Of Concrete-filled Steel Tubular Columns Exposed To The Standard Fire