Week 3 Challenge

AIM:To create the wind pressure, dead load and live load for given hospital at darjeeling.

INTRODUCTION:In stadd pro calculated the load and load combinations, wind pressure.

PROCEDURE:

1.1ANS:

The primary load cases are involved in structure design.

• Dead load
• Live load
• Wind load
• Sesimic load

1.2ANS:

ONE WAY SLAB-The ratio of longer span to the shorter span is greater than 2.

Ly/Lx >2

1.3ANS:

• The unit weight of steel is 78.5Kn/cum
• The unit weight of soil is11Kn/cum(dry soil)
• The unit weight of soil is 18Kn/cum(wet soil)

1.4ANS:

The sollowing section are in properties tab in STAAD Pro

• Rectangle
• Circular
• Trapeziodial
• Square etc.

1.5ANS:

The beams are connecting between the column, loads are transfering to the column is knowns as Primary beam.

2.1ANS:

The factors and parameters that influence the design pressure intensity of a high-rise building.

Design pressure Pz=0.6(Vz)2.

Vz=VbxK1xK2xK3xK4.

Vz=Design speed

K1=Risk coefficent

K2=Height factor

K3=Topography factor

K4=Combination factor

2.2ANS:

3.1ANS:

ONE WAY SLAB-The ratio of longer span to the shorter span is greater than 2.

Ly/Lx >2

TWO WAY SLAB-The ratio of longer span to the shorter span is less than 2.

Ly/Lx <2

3.2ANS:

Secondary beam-The beam running in between the primary beam.

3.3a ANS:

• Dead load-IS 875 part -I
• Live load-IS 875 part-II
• Wind load-IS 875 part-III
• Sesimic load-IS 1893-part I

3.3b ANS:

The parameters of each load case

• Static
• Dynamic
• Primary effects

3.3c ANS:

Dead load- It is for self weight

Live load-It is for movable or tempoary loads

Wind load-It depends on structure,height of the structure.

Sesmic load-It is calculated for sesmic force in earth condition.

3.4ANS:

Start STAAD Pro

Adopt the structral wizard or node by node method for structure.

Assign the properties like geometry ,material,specifications,supports,loading perform analysis .

3.5ANS:

• Open the STAAD Pro
• Draw the frame by using the structural wizard .
• Insert the node at the mid point.
• Add the beam in geometery tab.

PRACTICAL

Calculate the wind pressure for the given building
a. Building Dimension : 20m x 30m x 20m height RCC
b. Building usage : Hospital block in city centre
c. Location : Darjeeling

ANS:

Wind pressure as per IS -875 part III

Design pressure Pz=0.6(Vz)2.

Vz=VbxK1xK2xK3xK4.

Vz=Design speed

K1=Risk coefficent(C.6.3.1)

K2=Height factor(C.6.3.2)

K3=Topography factor(C.6.3.3)

K4=Combination factor(C.6.3.4)

Vb=47m/s at Darjelling

K1=1.07

K2=0.8

K3=.1

K4=1.3

Vz=47x1.07x0.8x1x1.3

Vz=52m/s

Pz=0.6(52x52)

Pz=1.622KN/sqm

The Dead load (IS 875-Part -I)and Live load(IS 875-Part II) for the above building with reference to IS standards

Dead load=Unit weightXVol of the building

Dead load=25x20x30x20

Dead load=3,00,000KN-M

Live load

S.NO.	ROOMS	UDL(KN/CUM)
1	Corridors,passegers,lobbies,staircase including ire escapes as per floor	4.0
2	X-ray,opertating,general storage	3.0
3	Toilets & Bath room	2.0
4	Cafeteria	3.0
5	Office room	2.5
6	Laboratories	3.0

RESULT:To complete the calculation of the wind pressure, dead load and live load for given hosptial at darjeeling.