High Rise Structural Systems
By
1.Mohamed Ayman
2.Mohamed Ali
3.Mohamed Atef
4.Mohamed El Sayed
Under Supervision of
Dr. Ahmed Kamal Abd El Zaher
LOADS ON THE HIGHRISE
STRUCTURES.
• Vertical Loads.
• Horizontal Loads.
• Unexpected Deflections.
• Wind Loads.
• Earthquake Loads.
– Definition.
– Earthquake.
– Seismic Waves.
– Pressure waves.
– Shear waves.
Types of High rise structures
• Braced Frame.
– Braced frames are cantilevered vertical trusses.
Advantages
Disadvantages
• Rigid Frame Structure
– Consist of columns and girders joined by
moment resistant connections.
Advantages
Disadvantages
• In-filled Frame Structure.
– Most usual form of
construction for tall
Buildings up to 30 stories
in height Column and girder
framing of reinforced concrete.
• Flat Plate and Flat Slab Structure.
– Is the simplest and most logical of all structural
forms in that it consists of uniforms slabs,
connected rigidly to supporting columns.
– Particularly appropriate for hotel and
apartment construction where ceiling space is
not required and where the slab may serve
directly as the ceiling.
• Shear wall structure.
– Concrete or masonry continuous vertical walls
may serve both architecturally partitions and
structurally to carry gravity and lateral loading.
Action to be considered.
Problem associated with formwork systems.
• Coupled wall structure.
– Consist of two or more shear walls in the same
plane, or almost the same plane, connected at
the floor levels by beam or stiff slabs.
• Wall-frame structure.
– The walls and frame interact horizontally to
produce stiffer and stronger structure.
– Appropriate for the building in the 40 –60 story
range
– The frames consist of 6-12 ft (2-4m) between
centers, joined by deep spandrel girders.
– Gravity loading is shared between the tube and
interior column or walls.
• The trussed tube.
– Relatively broad column
spacing can resulted large
clear spaces for windows,
a particular characteristic
of steel buildings.
– The trussed tube system represents a classic
solution for a tube uniquely suited to the qualities
and character of structural steel.
• Tube in tube or Hull core structure.
– This variation of the framed tube consists of an
outer frame tube, the “Hull,” together with an
internal elevator and service core.
– The Hull and core act jointly in resisting both
gravity and lateral loading.
– The structural tube usually adopts a highly
dominant role because of its much greater
structural depth.
• Bundled tube structure.
– The concept allows for wider column spacing
in the tubular walls than would be possible
with only the exterior frame tube form.
– The spacing which make it possible to place
interior frame lines without seriously
compromising interior space planning.
• Core and Outriggers system.
– Outrigger serve to reduce the overturning
moment in the core that would otherwise act
as a pure cantilever.
– In high-rise building this same benefit is
realized by a reduction of the base core overturning moments and the associated reduction
in the potential core uplift forces.
• Advantages:
– The outrigger systems may be formed in any
combination of steel, concrete, or composite
construction.
• Disadvantages
• Hybrid Structure.
– A Combination of two or even more of basic
structural forms.
– Hybrid structures are likely to be the rule rather
than the exception for future very tall buildings.
– High-strength concrete, consist of stiffness and
damping capabilities of large concrete elements.