2Definition Of CoreThe central of arterial part of a multistory building that integrates functions and service needs for established occupants. Such areas are normally composed of toilet facilities, elevator banks, janitors’ closet, utilities, mechanical facilities, smoke shafts and stair.Core also known as facade envelope is a spatial element for load-bearing high-rise building system.
3Characteristic Shape of core Number of cores Location of cores Arrangement of coresGeometry of building as generator of core form
4Function Tying the building together to act as a unit To maximize flexibility in layoutAs shear wall systems to provide the necessary lateral stability for the buildingResist lateral forces from any directionCarries gravity loads
5Elements Electrical & Telephone Piping and risers Transportation Fans roomToilets
7Advantages and Disadvantages Off CenterAdvantagesAll window or building perimeter space to be used for officesMore flexibility in maximum depth and arrangement of spacesAffords the opportunity of developing small secluded space in the relatively narrow portion of the floor plan where the core is closes to the exterior walls.DisadvantagesPresent some problems of accessLess flexibility of tenant distributionRemote and thus less convenient to the far sides and corners of the building
8CENTRAL CORE Central Advantages Allows all window all window space to be utilized as rental of the building plan will permit offices of verging depths to receive natural lightExtremely convenient of access and in some cases may be equidistant for all sideSimplifies area division & provides good flexibility of tenant distribution in the some wayHorizontal utility runs may also relatively equidistant from the coreCombine with a square building plan, bearing exterior & core walls, this location permits a floor plan tree of columns and thus totally flexible for office layoutDisadvantagesThe central interior location limits the depth of offices in the mid-zone of each floorIt requires an access corridor around its perimeter
9MATERIALReinforced concretelarge net tension forces exist can negate the inherent efficiency of concrete in compression resistanceWalls become thickConcreteFire-resistance, in particular of lift and piping shafts, is goodExecution is efficientLateral forces can be transmitted employing the surrounding skeletonsufficient stiffnessSteelLarge and costlyachieve its lateral stability.necessary core stiffnessrelatively rapid assemblage of the prefabricated members.Enclose space, no extra consideration need to be given to fire proofing.Lack of ductilityRespect to earth quake loading