Challenge

Week 6 Challenge

MMayur Dixit13 Mar 2023

AIM : PIPE LOAD ON BRIDGES AND ANALYSIS OF BRIDGE IN STAADPRO

INTRODUCTION :

In this challenge i have to calcuate pipe loads on bridges . Bridge is loacated at bank of Narmada River
Due to some improper photos are given i assumed some values and sections are not as per photos
Some values are taken from the google.

Given :

Span of the bridge = 24m
width of the bridge 3m
Height of the truss = 2.5m
Height of pier =5m asumed
Dia of pipe =

600NBDI = 217.19 Kg/m load as per class K9 for pipe length 5.5m

200NBDI = 45.28 Kg/m Load as per class 9 for pipe length 5.5m

ASUMPTIONS :

Height of pier = 5m
top and bottom chord = ISMB350
Vertical and strut = ISMC300
Diagonal and top lateral bracing = ISA 90X90X8

MANUAL CALCULATION FOR THE LOADING :

1. For 600NBDI pipe of class K9 in kg/m

load for 5.5m length = 217.19 kg/m

for 24m length = 24/5.5 = 4.36

load = 217.19 x 4.36 = 946.94kg/m

to aplly this load on bridge i have to convert this load into kn/m

1kg/m = 0.00981 kn/m

Load = 946.94 x 0.00981 = 9.28kn/m

Self weight of 600NBDI pipe = 9.28kn/m

LIVE LOAD IN 600NBDI PIPE = AREA X UNIT WEIGHT OF WATER
= `(PIE/4)*(0.6*0.6)` x 10
= 2.82 KN/M
`TOTAL WEIGHT IN 600NBDI PIPE = SELF WEIGHT + LIVE LOAD`
= 9.28 + 2.82
`nbsp; = 12.1 KN/`

2. For 200NBDI pipe of Class K9 for 5.5m length

For 600NBDI pipe of class K9 in kg/m

load for 5.5m length = 45.28 kg/m

for 24m length = 24/5.5 = 4.36

load =42.28 x 4.36 = 197.42kg/m

to aplly this load on bridge i have to convert this load into kn/m

1kg/m = 0.00981 kn/m

Load = 197.42 x 0.00981 = 1.93kn/m

Self weight of 600NBDI pipe = 1.93kn/m

LIVE LOAD IN 600NBDI PIPE = AREA X UNIT WEIGHT OF WATER
= `(PIE/4)*(0.2*0.2)` x 10`
`nbsp; = 0.44 KN/M`
`TOTAL WEIGHT IN 600NBDI PIPE = SELF WEIGHT + LIVE LOAD`
`nbsp; = 1.93 + 0.44`
`nbsp; = 2.33KN/`

PROCEDURE TO CREATE MODEL :

STEP 1: TRUSS CREATION :

In the first step i created a node at 0,0,0 and by using traslational repeat copied this node at y anis and created beam between this two nodes. Selected the created beam and by using translational repeat copied this beam in Z direction and conected upper and bottom nodes by adding beams in it .
The squre of beam is created of size 3m width and 2.5m height and as per the drawing given in the question and this squre is copied in the X direction by using translational repeat of distance 3m of 7 steps such as 24m span we are creating . then structure looks like below photo

After that the nodes are joined and square truss is created , beams are created in bottom and upper part horizontally then structure will look like this

Diagonal sections are created as per the drawing and jpoined the nodes as per drawing

Piers are created of 5m height

After Fixed Suports are cetaed and assigned to the bottom nodes of the all the pier

Clicked on the properties and created a following :

ISMB350 STEEL
ISMC300 STEEL
ISA90X90X8 STEEL
CIR 1.5M DIA CONCRETE

The created properties are assigned as follow

ISMB350 : this proprty is given to the top and bottom chord as follow

b. ISMC300 : this property is given to the verticle member

c. ISA90X90X8 : this property is given to the diagonal bracing

d. CIR 1.5M DIA CONCRETE : this property is asigned to the piers

e. As per the question to give the pipe load on bridge the 2 Dummy girders are created of 0.1mX0.1m size are as below

Now our geometry is created and properties and supports are given and our structure will looks like this

STEP 2: LOADINGS :

GIVEN DATA :

The bridge is located in the banks of river narmada. Assume that the narmada river is flowing in the jabalpur city in madhya pradesh

thiats why i have to give seiesmic load and pipe load on the bridge

SEISMIC LOAD :

To create a seismic load click on Loading option
Click on Definitions - Seismic definition - generate -
select city=Jabalpur
select Response reduction factor = Steel building with special moment resisting and add self weight =1

Click on load cases details- add - names as EQ in X,Y and Z direction and add seismic load as IS1893 part 6 load in all direction

After all this operation seismic load is created successfully .

2. PIPE LOAD :

Click on load case details
add load case named as PIPE LOAD 600NBDI - ADD - MEMBER LOAD - UNIFORM LOAD = -12.1Kn/m and assign this load to the dummy beam shown as figure

Click onload case details and add load case named as PIPE LOAD 200NBDI - ADD - MEMBER LOAD - UNIFORM LOAD - 2.33kn/m and assign this load to the another dummy beam as shown in figure