Challenge

To calculate the dead , live and wind load for RC residential structure and to apply them using TSD

PPunitharanganathan M21 Jun 2022

1.) Calculate dead load in design report based on IS code and apply dead load on the model

Finishes of 50mm
Slab thickness as per the design
Brick wall load
Roofing load

AIM :

To Calculate dead load in design report based on IS code and apply dead load on the model

INTRODUCTION :

Dead loads, also known as permanent or static loads, are those that remain relatively constant over time and comprise, for example, the weight of a building's structural elements, such as beams, walls, roof and structural flooring components. constant load in a structure (such as a bridge, building, or machine) that is due to the weight of the members, the supported structure, and permanent attachments or accessories.

PROCEDURE :

Finishes of 50mm
Slab thickness as per the design
Brick wall load
Roofing load

finish loading

finish load=0.5 X 24=1.2kN/m2

Slab loading

slab load will be generated within the softwara

brickwall+cement plaster thickness 230mm

brickwall loading

GL-Ist floor-0.23X20X3.2=14.72kN/m8

same for 1st floor-roof level

Roof loading

roof level-(paraphet wall height is 900mm and thickness 155mm)=0.155X0.9X20=2.79kN/m^3

roofing load-finish floor-1.2kN/m2

Load applied on model :

First we want to create a load cases
Next we want to create a load combination with use of generate option
Next we want to create a frame with use of frame option
Next select the dead load on bottom of the screen
And select the area load
apply the dead load 1.2 Kn/m^2
Next we want to apply the brick wall load = 14.72 kN/m^2
The applied load as been shown below

RESULT :

As per the question to Calculate dead load in design report based on IS code and apply dead load on the model is completed

2.) Calculate live load in design report based on IS code and apply dead load on the model

AIM :

To Calculate Calculate live load in design report based on IS code and apply dead load on the model

INTRODUCTION :

Live load is a civil engineering term for a load that is not constant, but changes over time. Live loads can be caused by anything adding, removing, or relocating weight on a structure. This includes people walking across a surface and objects that can be moved or carried.

Live loads (also known as applied or imposed loads, or variable actions) may vary over time and often result from the occupancy of a structure. Typical live loads may include; people, the action of wind on an elevation, furniture, vehicles, the weight of the books in a library and so on

PROCEDURE :

AS per IS 875 - part 3,The given live loads are:

office=3 KN/m^2
reception=3 KN/m^2
meeting room/conferece room-4 kN/m^3
equipment room =10 KN/m^2
Toilets=2 KN/m^2
Store room= 5 KN/m^2
Staircase =3=4 KN/m^2
Lobby =3 KN/m^2
Cooridor=4 KN/m^2
Roof (accessible) =1.5 KN/m^2

Load applied on model :

Next we want to apply the imposed load
Go select the imposed load on bottom of the screen
As per the IS 875 rules the imposed load as been applied
First go to the Area load under the modal tab
Finally apply the load

RESULT :

As per the question to Calculate live load in design report based on IS code and apply dead load on the model is completed

3.) Generate manual wind loading in the design report based IS code as per the following input

Basic wind speed = 50m/s
Terrain category 2

AIM :

To Generate manual wind loading in the design report based IS code as per the following input

INTRODUCTION :

Wind load is the load, in pounds per square foot, placed on the exterior of a structure by wind. This will depend on: The angle at which the wind strikes the structure. The shape of the structure (height, width, etc.). Armed with pressure and drag data, you can find the wind load using the following formula: force = area x pressure x Cd. Using the example of a flat section of a structure, the area – or length x width – can be set to 1 square foot, resulting in a wind load of 1 x 25.6 x 2 = 51.2 psf for a 100-mph wind.

PROCEDURE :

Given Data :

Basic wind speed = 50m/s
Terrain category 2
Total length of the building (l) = 19.225m
Total width of the building (w) = 10.700m
Total height of the building (h) = 16.8
Class of the structure = Class A
Life of the structure = 50 Years
l/w = (19.225/10.700) = 1.79
h/w = (16.8/10.7) = 1.5

STEP :1

EXTERNAL PRESSURE CO-EFFICIENT (Cpe)

As per the IS 875 Part 3, Table 5

Building height ratio

Building height ratio = 1/2<h/w<3/2

= 0.5<1.5<1.5

Therefore, the building plan ratio = 3/2 < l/w < 4

= 1.5 < 1.79 < 4

Hence the plan we choose is given below

STEP :2

Finding the Factors (k1, k2, k3, k4)

k1:

From Table 1 for the basic wind speed for 50 m/s,

Risk Coeffiecent, K1 = 1.0

K2 :

From Table 2,

16.8m height = terrain category 2

20m height = 1.07

by using the interpolation method,

k2 = 1.05

K3:

Topography factor, k3 = 1 (from clause 6.3.3)

K4:

Importance factor K4 = 1 (from Clause 6.3.4)

STEP :3

Vz=Vb x k1 x k2 x k3 x k4

= 50x1x1.05x1x1

= 52.5 m/s

STEP :4

Pz = 0.6 Vz^2

= 0.6 x 52.5^2

= 1653.75 N/sq.m

= 1.653 kn/sq.m

STEP :5

Wind direction (up to roof level) Y-direction :

1.) Wind direction along y- direction (Face A):

	Cpe +	Cpi -
Height of the building	16.8m	16.8m
External pressure co-efficient Cpe	0.7	0.8
Internal pressure co-efficient Cpe	0.5	-0.5
Net pressure co-efficient Cp = Cpe - Cpi	0.2	1.2
Design wind pressure, Pz	1.984	1.98
Wind load on Wall (Cp x Cz) Kn/m^2	0.4	2.38
Factor loading (1.05)	0.42	2.5

2.) Wind direction along Y- direction (Face B):

	Cpe +	Cpi -
Height of the building	16.8m	16.8m
External pressure co-efficient Cpe	-0.3	-0.3
Internal pressure co-efficient Cpe	0.5	-0.5
Net pressure co-efficient Cp = Cpe - Cpi	-0.8	0.2
Design wind pressure, Pz	1.984	1.984
Wind load on Wall (Cp x Cz) Kn/m^2	-1.587	0.4
Factor loading (1.05)	-1.667	0.42

3.) Wind direction along Y- direction (Face C&D):

	Cpe +	Cpi -
Height of the building	16.8m	16.8m
External pressure co-efficient Cpe	-0.7	-0.7
Internal pressure co-efficient Cpe	0.5	-0.5
Net pressure co-efficient Cp = Cpe - Cpi	-1.2	-0.2
Design wind pressure, Pz	1.984	1.984
Wind load on Wall (Cp x Cz) Kn/m^2	-2.38	0.4
Factor loading (1.05)	-2.5	-0.42

Wind direction (up to roof level) X-direction :

1.) Wind direction along X- direction (Face A&B):

	Cpe +	Cpi -
Height of the building	16.8m	16.8m
External pressure co-efficient Cpe	-0.5	-0.5
Internal pressure co-efficient Cpe	0.5	-0.5
Net pressure co-efficient Cp = Cpe - Cpi	-1	0
Design wind pressure, Pz	1.984	1.98
Wind load on Wall (Cp x Cz) Kn/m^2	-1.984	0
Factor loading (1.05)	-2.08	0

2.) Wind direction along X- direction (Face C):

	Cpe +	Cpi -
Height of the building	16.8m	16.8m
External pressure co-efficient Cpe	0.7	0.7
Internal pressure co-efficient Cpe	0.5	-0.5
Net pressure co-efficient Cp = Cpe - Cpi	0.2	1.2
Design wind pressure, Pz	1.984	1.984
Wind load on Wall (Cp x Cz) Kn/m^2	0.3896	2.38
Factor loading (1.05)	0.471	2.5

3.) Wind direction along X- direction (Face D):

	Cpe +	Cpi -
Height of the building	16.8m	16.8m
External pressure co-efficient Cpe	-0.1	-0.1
Internal pressure co-efficient Cpe	0.5	-0.5
Net pressure co-efficient Cp = Cpe - Cpi	-0.6	0.4
Design wind pressure, Pz	1.984	1.984
Wind load on Wall (Cp x Cz) Kn/m^2	-1.2	0.8
Factor loading (1.05)	-1.26	-0.84

RESULT :

As per the question Generate manual wind loading in the design report based IS code is completed

4.) Based on the above calculation apply the loadings on the model

AIM :

To Based on the above calculation apply the loadings on the model

INTRODUCTION :

Internal and external forces act on structural components. An external force is commonly referred to as a structural load; an internal force is a stress.Loads can be defined as the forces that cause stresses, deformations, or accelerations. These loads are applied to a structure or its components that cause stress or displacement. There are different types of structural loads such as dead load, live load, etc we need to consider during the design process.

PROCEDURE :

Load applied on model :

So next we want apply the wind load
Wind load cases as been created
Next set the wind load on bottom of the screen
And go to the area load
set the global y on the general box
Then apply the load on the wall panel
Use the above calculation to apply the load
Use the frame option select the frame 1 and 3 , frame A and E
Then use the x and y direction
select and use the (Wind + Y + CPI), (Wind + y - CPI), (Wind + X + CPI), (Wind + X - CPI),
Apply all direction of the load as been shown below