Week 5 Challenge
AIM : WIND LOADS ON BRIDGE AND ANALYSIS
INTRODUCTION :
1. In this challenge i have to calculate wind pressure acting on bridge
2. The height of pier is 9m and assumed size of cross beams and girder is 1mx1m
3. To solve the question IS 875 Part 3 is used
PROCEDURE :
STEP 1 : UNDERSTANDING THE CHALLENGE
Initially the all measurements and assumptions are decided to make a model
STEP 2 : CALCULATION
Wind speed : Vz = Vb x k1 x k2 x k3 x k4
1> From fig 1 of IS 875 Part 3 Basic wind speed = 39 m/s
Bridge is located at Mumbai
k1 = 1.06
2> Open terrain scattered obstruction height less than 10m is lies in category 2
k2= 1
3> From IS 875 Part 3
CL.NO. 6.3.3
k3= 1
4> From IS 875 Part 3
k4 = 1
Wind Speed : Vz : Vb x k1 x k2 x k3 x k4
= 39 x 1.06 x 1 x 1 x 1
= 41.43 m/s
Wind Pressure : Pz
Pz = 0.6 x Vz x Vz
= 0.6 x 41.34 x 41.34
= 1.025 kn/m
This pressure is applied as UDL on bridge sides
pier = 1.025 x 1.5 = 1.537 m/s
Cross beams = 1.025 x 1 = 1.025 m/s
STEP 3 : MODEL MAKING
STEP 4 : RESULTS
