High Rise Structural Systems

tobascothwackUrban and Civil

Nov 15, 2013 (3 years and 8 months ago)

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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 over
-
turning 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.