PENGARUH PENGEKANGAN PADA ANALISIS MOMEN NOMINAL UNTUK PENGAMANAN KOLOM BETON BERTULANG TERHADAP KEGAGALAN GETAS GESER

Abstract

SNI 03-2847-2002 code defines the nominal shear strength of a structural member from the nominal bending moments at both ends of the corresponding member. This condition is implemented in the design to avoid the shear failure against severe earthquake. Ideally, the flexural failure in a member is expected to occur prior to the brittle shear failure. However, in the practical design, the computed nominal bending moments do not include the effects of confinement. Needless to say, the existence of confinement in a structural member increases the its flexural strength and the strength gain primarily depends on the amount of confinement. Confinement as one of the effective solutions in enhancing the ductility of a member has significant effects on the mode of failure of a member during large earthquake. The increase of flexural strength of a member due to confinement will also increase the shear capacity of the corresponding member. If the increase of the nominal bending moment is not taken into account during the calculation of the shear capacity of a member, the brittle shear failure can take place prior to the preferable flexural failure.