21-11-2012, 01:35 PM
Design and drawing of RC Structures
Design and drawing.ppt (Size: 920.5 KB / Downloads: 225)
INTRODUCTION
A portal frame consists of vertical member called Columns and top member which may be horizontal, curved or pitched.
Rigidly connected
They are used in the construction of large sheds, bridges and viaducts.
The base of portal frame may be hinged or fixed.
The portal frames have high stability against lateral forces
A portal frame is a statically indeterminate structure.
In the case of buildings, the portal frames are generally spaced at intervals of 3 to 4m
Reinforced concrete slab cast monolithically between the frames
Frames used for ware house sheds and workshop structures are provided with sloping of purlins and asbestos sheet roofing between the portal frames.
The base of the columns of the portal frames are either fixed or hinged.
Analysis of frames can be done by any standard methods
Columns are designed for axial force and bending moment, whereas beam is designed for bending moment and shear force