Assignment of Column and wall design of 20 story building for wind and Earthquake loading according to Eurocode 8
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Course
Structural Engineering
Institution
Structural Engineering
Book
Eurocode 8, Design of Structures for Earthquake Resistance: Assessment and retrofitting of buildings
detailed structural analysis and design for the proposed 20 story building.
Carrying out all design checks of one of the selected shear walls of the model that i have developed for the assignment with all critical load combinations.
Carrying out the primary design of two selected columns (one per...
As a Design Engineer, you are asked to do the detailed structural analysis and design for the proposed 20
story building. (Same building that you considered for Assignment 1 & 2 )
X - Last digit of your registered number
y – 1st digit of your registered number Ground floor clear height 4m and rest of the clear floor heights are
3.5m.The typical floor arrangement and the use of zonation given; (Refer the Fig. 1)
1. Provide a brief discussion highlighting the special analysis and design checks that have to be carried
out relevant to a high-rise design compared with a low-rise building design.
2. Carry out all design checks of one of the selected shear walls of the model that you developed for the
assignment with all critical load combinations.
3. Carry out the primary design of two selected columns (one perimeter column and one internal column)
at Ground floor level
4. Develop clear sketches of structural details for elements discussed in Q 2 and 3 while incorporating
earthquake detailing rules. Clearly present applied rules/calculations in this regard relevant to above
cases.
(it shall obtain all design inputs from prepared SAP model for the building and all such inputs shall
be clearly specified. All design assumptions shall be mentioned clearly. Design wind speed shall be
obtained based on local design wind speed data and 0.1g PGA value shall be considered as
earthquake load – same soil parameters used in Assignment 2 shall be used and at least spectral
acceleration of ßag ( 0.2 X 0.1g)- as EC 8 shall be considered when calculating equivalent static load
or response spectrum analysis. Design checks shall be carried out either of relevant BS of Euro codes
and all design calculation steps shall be clearly mentioned)
,HIGH RISE BUILDING DESIGN
NAME: G.H.R DE SILVA
, Subject :- - High Rise Building Design-CVX9412
Reg No- 722460912 (G.H.R De Silva)
Reference Calculation Output
Special analysis and designs for high rise building compared to low rise building
1. Analysis for earthquake loads
When performing structural analysis of high rise building it is must to analyze for
earthquake loads. When you compare low rise building high rise bulding, moment of
initia due to lateral earthquake forces are high and this can be critical during the
earthquake to highrise builds more than lowrise building
2. Analysis for wind forces
The main horizontal load that acts on a high–rise building is wind. The most important
factor in terms of ensuring the stability and comfort of finding a person on the highest or
last floors is the provision of a load-bearing system to resist wind loads. When the
building height increases, wind loads increase, in addition to static ones, aeroelastic
dynamic vibrations occur, the value of which can often dominate. The effect of wind
load on high-rise buildings is of great interest in terms of the resulting aerodynamic
fluctuations, the distribution of wind pressure along the height of a building or structure,
the effect of air flows on nearby buildings, and other aspects
3. Balancing the shear center and centeroid of the building
This analysis is specially conducted in highrise building analysis. This conducted
specially to avoid any Twisting condition of the building and this non twisting can be
achieved by properly placing shear wall to match up the shear center with building
gravity center.
4. Design and construction Shearwalls
Shear walls will resist lateral forces such as wind forces or earthquake forces. So it will
reduce the s`way of the high rise buildng and also recude the moments acting on the
columns.
5. Ductility Detail of Highrise building
The ductility of building structures is to ensure that building have a certain energy
dissipation capacity and deformation to avoid sudden brittle damage in the earthquake
and fierce wind. Therefore this detailing specially carried out in Highrise building
design.
, Subject :- - High Rise Building Design-CVX9412
Reg No- 722460912 (G.H.R De Silva)
Reference Calculation Output
The lateral forces acting on the structure are solely due to wind actions and
Earthquake actions to be checked to design the shear walls and columns.
This building is four storeyed building and it is about 74 m in height.
Calculation of Wind horizontal actions
SL NA to The following procedure is used to obtain the wind actions acting on the
EC 01 : 2015 structure.
BS EN1991-
1-4 : 2005 Building location - Colombo
Part 1-4 According to the wind loading zone diagram,
Wind actions
Appendix 1 Wind zone = 03
BS EN1991- The fundamental value of the basic wind velocity (Vb,0),
1-4 : 2005 Vb,0 = Vb, zone . Calt
Part 1-4 where,
Cl 4.2(1) Vb, zone - fundamental value of basic wind speed before altitude correction
Note (2) is applied
& Calt - Altitude factor
SL NA to
EC 01 : 2015 The equivalent 10 min. mean basic wind speed for 50 years return period,
BS EN1991- for wind zone 03,
1-4 : 2005 Vb,zone = 22 m/s
Chapter 02
Table 01 Calt = 1 + 0.001A 1.5 (maximum)
where, A - Site altitude in meters above mean sea level
Altitude of building location from mean sea level,
A = 8m
Calt = 1 + 0.001A 1.5 (maximum)
= 1 + 0.001 x 8
= 1 < 2
Hence, Vb,0 = Vb, zone . Calt
= 22 x 1.008
BS EN1991- = 22 m/s
1-4 : 2005
Part 1-4 Vb = Cdir . Cseason . Vb,0
Cl 4.2,(2) Where,
Note (2) Vb = Basic wind velocity
& Cdir = Directional factor
SL NA to Cseason = Season factor
EC 01 : 2015 Cdir = 1
BS EN1991- Cseason = 1
1-4 : 2005 Vb = Cdir . Cseason . V
Chapter 02 = 1 x 1 x 22.31
-1
Table NA.1 = 22.31 ms Vb = 22.31 ms-1
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