Lateral Load Resisting Systems four classical lateral load resisting systems for multistory building frames.They are the (1)core braced system, (2)moment-truss system, X (3)outrigger and belt system,and (4)tube system. .Simple steel framing -Composite slab Floor Plan Composite slab Core walls一 -Simple connection core braced system Exterior steel column Corbel-
four classical lateral load resisting systems for multistory building frames. They are the (1) core braced system, (2) moment–truss system, (3) outrigger and belt system, and (4) tube system. Lateral Load Resisting Systems core braced system
Moment connection typical moment-truss system Moment frames Knee bracing X orK bracing Moment connection (al typical Moment frames (a)Moment frame with internal Concrete braced trusses walls (b)Moment frame with internal core walls. b】
(a) Moment frame with internal braced trusses. (b) Moment frame with internal core walls. moment–truss system
Moment-truss frame Moment-Truss Systems Sway characteristics of rigid braced,simple braced,and rigid unbraced frames frame Simple connection 10 15 20 Lateral defection(cm) Moment frame nteracting forces Braced Behavior of frames subjected to lateral load: (a)independent behavior, (b)interactive behavior
Moment–Truss Systems Sway characteristics of rigid braced, simple braced, and rigid unbraced frames Behavior of frames subjected to lateral load: (a) independent behavior, (b) interactive behavior
Steel-Concrete Composite Systems For composite frames resisting gravity load only,the beam- to-column connections behave as they do when pinned before the placement of concrete. Composite action in the joint:based on the tensile forces in the rebars that act with the balancing compression forces transmitted by the lower portion of the steel section that a flushed end plate bolted a bottom angle with bears against the to the column flange double web cleats column flange to form a couple
Steel–Concrete Composite Systems For composite frames resisting gravity load only, the beamto-column connections behave as they do when pinned before the placement of concrete. a flushed end plate bolted to the column flange a bottom angle with double web cleats Composite action in the joint: based on the tensile forces in the rebars that act with the balancing compression forces transmitted by the lower portion of the steel section that bears against the column flange to form a couple
Transferring of moment through slab reinforcement U bars at perimeter columns. 2150 Projection≥0.2L (a)Connection detail (b)Reinforcement detail U bars Effective breadth of slab≤6D3at edge columns
(a) Connection detail (b) Reinforcement detail Transferring of moment through slab reinforcement at perimeter columns