Design and mechanical performance analysis of a new GFRP-steel buckling restrained brace
In order to develop lightweight and corrosion-resistant buckling restrained brace,a new type of glass fibre polymer(GFRP)-steel buckling restrained brace(GBRB)was proposed using GFRP pultruded profiles wrapped with the filament-wound layer as the restrained member and the H-shaped steel as the inner core.The development law of buckling modes in the inner core was investigated through theoretical analysis and numeri-cal simulation.The design parameter calculation formula for the restrained member was established considering the anisotropy and the characteristics of the laminates of the GFRP.The influences of gap-thickness ratio,width-thickness ratios of the flange and web,and fibre angle on the interaction characteristics of the restrained member with the inner core were analysed,and reasonable values were given.The reliability of the design method for GBRB was validated using example analysis.The results show that flange local buckling,global buckling around the weak axis,web local buckling,and global buckling around the strong axis occur sequen-tially in the H-shaped steel core.The overall buckling deformation mode is relatively low,but the local buck-ling is high-order.The gap-thickness ratio and width-thickness ratio affect the buckling mode development of the inner core,which in turn changes the stress state of the restrained member.The gap-thickness ratio should be 0.125 0 to 0.50,and the width-thickness ratio should be less than 6.29.The principal stress direction of the restrained member is essentially near 45°.Consequently,the fibres should be oriented perpendicular to one another at 45° to maximize the fibre's longitudinal bearing capacity.
万方数据
维普
