Challenge

Week 5 Challenge

AAnand Mandal18 Jan 2023

AIM- as per given data apply design wind load on the structure.

Given data-:

height of bridge is 9m

pier size 1.5*1.5m

loaction is mumbai open terrain obstruction ht less than 10m

calculation of wind pressure-:

step1:Wind Speed Vz=Vb*k1*k2*k3*k4

k1,k2,k3,k4 are taken from IS 875 part 3 tables and criteria of loacation and structure respectively as follows

basic wind speed Vb=47 m/s

k1=1.07(as str is important str), k2=1.00(as obstruction and ht is 9m), k3=1.00 (dgree is less than 3)

k4=1.30(post cyclone importance)

Vz=47*1.07*1*1*1.30=51.7987 m/s say 51.8m/sec

wind pressure Pz=0.6Vz^2=0.60*51.8*51.8=1609.944N/m^2 or say 1.61Kn/m^2(this load has to be applied on super structure)

STADD PRO ANALYSIS

Create a node to structure a frame of 4 legged spaning 4m each pier size 1.5*1.5, ht 9m with fixed support and span of 10m

Next step after assing support then assing properties to the member as cross beam girder of rec(0.6*0.6m) and main girder of rec(1.5*1.5)

after assigning property to the member now define loading load as wind pressure is 1.61kn/m^2 and we provide it as udl mannually so for pier (1.5*1.5m)and main girder(1.5*1.5m) the along +X direction and -X direction W1=1.61*1.5=2.415kn/m apply this w1 and showing loading diagram

-X direction loading

Simillarly in +Z direction and -Z direction the pier W1=-2.415kn/m but for cross beam girder(0.6*0.6m) W1=1.61*0.6=0.966kn/m this loading has to be apply by selecting the beam member