Department of Architecture
BUILDING CONSTRUCTION 3
PRECAST SKELETON CONSTRUCTION SYSTEM
Done By: Dina Khouri 1090999
Islam Hijazi 1080984
Marian Shomali 1090213
Instructed by: Dr. Mohammad Abd-al-hadi
Every construction material and system has its own characteristics which to a greater or lesser extend influence the layout, span length, construction depth, stability system, etc. This is also the case for precast concrete, not only in comparison to steel, wood and masonry structures, but also with respect to cast in-situ concrete. Theoretically, all joints between the precast units could be made in such a way that the completed precast structure has the same monolithic concept as a cast in-situ one. However, this is a wrong approach and one, which is very labour intensive and costly. If the full advantages of precast concrete are to be realised, the structure should be conceived according to its specific design philosophy: long spans, appropriate stability concept, simple details, etc. Designers should from the very outset of the project consider the possibilities, restrictions and advantages of precast concrete, its detailing, manufacture, transport, erection and serviceability stages before completing a design in precast concrete
Portal frame and skeletal systems consist of linear elements (beams, columns) of different shapes and sizes, combined to form the skeleton of a building. They are very suitable for buildings, which need a high degree of flexibility. This is mainly because of the possibility to use large spans and to achieve open spaces without interfering walls. There are two basic types: The portal frame, consisting of columns and roof beams, and used for single-storey retail warehousing and industrial manufacturing facilities. The skeletal structure, consisting of columns, beams and slabs for low to medium-rise buildings with a small number of walls for high rise. Skeletal frames are used chiefly for commercial buildings, offices and car parks, but sometimes also for apartment buildings
Variations of skeletal frame systems:
1. Structural system 1:
The system consists of columns with corbels, inverted t-beams and slab components. Columns are restrained at their bases and are spliced at each floor. Beams are temporerely simply supported on the corbels, but rigid joints are formed afterwards. Floor slabs are simply supported.
Structural system 2:
The system consists of frames, beams ans slabs.Frames are one-storey high, simply supported on top of each othr,and are connected by a simply supported beam on each floor. Floor slabs are also simply supported.
Structural system 3:
The system consists of one and two storey high columns, beams and floor slabs.columns are restrained at their bases and erected with staggered joints. Beams are temporarily in simply supported state. They are designed to have permanent rigid joints after construction. Floor slabs are simply supported from beam to beam.
Structural system 4 comprises unspliced four storey high continuous columns with corbels,plus beams and floor slabs.The columns are resrained at their bases. Beams behave as simply supported at temporary stage, but are designed to have rigid joints after construction.floor slabs span from beam to beam, and are simply supported.
Structural system 5:
The system consists of T-shaped and L-shaped columns with beams suspended at the point of zero bending moment.floor slabs span from beam to beam and are simply supported. Frames of L or T-shaped columns are placed simply supported on top of each other. At each storey,these frames are connected bye beams spanning from frame to frame. All rigid joints are prefabricated as an integrated part of the columns.
The system consists of unspliced two...