RCC STAIRCASE

R.C.C STAIR CASESDOUBLE FLIGHT AND CANTILEVER STAIR CASESTUDIO 12 B THRID YEAR B.ARCHR.C.C. STAIR CASEConcrete grade : usually used M15 (1:2:4) /20 mm aggregate.Cover : minimum cover to reinforcement 15mm.Mild steel or tor steel reinforcement used.R.C.C STAIR CASEADVANTAGES OF R.C.C. STAIR CASEEasy to construct into any geometrical shape.More durable , fire resistant and less noisyRequire comparatively thin sections.Easy to wash and clean so provide better sanitation.They can be built of any complicated design.TYPES OF R.C.C. STAIR CASESDOG LEGGED CIRCULAROPEN WELLSINGLE FLIGHTDOUBLE FLIGHTCANTILEVERBALANCE CANTILEVERFOLDED PLATEFor concrete stairs:

form of stair and individual treads and risers may vary as desiredpre-cast stair elements are availableused where fire proof construction is requiredconcrete mix usually M15 (1:2:4) / 20mm aggregateminimum cover to reinforcement 15mm or bar diameter or greater value for 1 hour fire resistancewaist slab thickness 100 250mm (depending on stair type)mild steel or torsteel reinforcement usedcontinuous handrail of 840 915mm height above pitch line required on both sides of stair required if stair width is greater than 1060mm

No projection, other than handrails, is allowed in a staircasewithin a height of 2.0 m from the landing or pitch line.2.0 m headroomPitch lineHandrailProjectionLandingLandingDOUBLE FLIGHT STAIR CASE

DOUBLE FLIGHT STAIR CASEEXAMPLE :

DR. D.Y. PATIL DENTAL COLLEGE SIDE VIEWREINFORCEMENT DETAIL

DOUBLE FLIGHT STAIRCASEBehavior of double flight stairs has been investigated for various supporting arrangements. For convenience, the analytical results have been presented for a selected portion of staircase consisting of mid-landing, waist slab and floor landing which represents the general behavior For each support conditions a landing width of 1.5m has been selected.

CANTILEVER R.C.C. STAIRCASE

Definition : A cantilever staircase has one end of tread or going fixed and has other end free or it can be supported from centre with both ends free. It is made of various materials like wood, glass, r.c.c, fiber sheets or metal.

Cantilever staircase supported on spine beamCantilever staircase supported by wallCantilever staircase supported by wall.

This type of staircase has its tread supported by wall on one side and has a free end on the other side . Main reinforcement runs in the transverse direction at the top side of the steps, while shrinkage reinforcement runs at the bottom side of the slab in the transverse and longitudinal directions. To hold the top reinforcement in position of 6 mm stirrups are used every 20 to 25 cm. The main reinforcement is anchored in the wall whereas the shrinkage reinforcement is extended in the wall .

Longitudinal section of cantilever staircase AA

230 thick brick wall

Section A-ATHANK YOU-GROUP 5