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Phase 3

This document reports on the third phase of a bridge audit project to calculate load reactions. The objective was to understand concepts of force, weight, and loads on static structures and calculate reactions from bridge girders and columns supporting the structure. Different loads on the bridge were analyzed using principles of torque, moment, and Newton's third law. Calculations determined that the total load on the single bridge beam was 81.50kN and the uniformly distributed load was 4.2 kN/m along the 13.39m length. Reaction forces were also calculated from the girders, columns, and ground.

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95 views7 pages

Phase 3

This document reports on the third phase of a bridge audit project to calculate load reactions. The objective was to understand concepts of force, weight, and loads on static structures and calculate reactions from bridge girders and columns supporting the structure. Different loads on the bridge were analyzed using principles of torque, moment, and Newton's third law. Calculations determined that the total load on the single bridge beam was 81.50kN and the uniformly distributed load was 4.2 kN/m along the 13.39m length. Reaction forces were also calculated from the girders, columns, and ground.

Uploaded by

gurjot
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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NBC1103 Basic Structural

Mechanics

BRIDGE AUDIT PROJECT


Phase 3: Load Reactions

Student Name: Leontina Petrovic Student ID: s4673405

Student Name: Alana Crea Student ID: s8016208


Student Name: Gurjot kaur Student ID: s4652525

Submission Date: 12/09/2022

NBC1103 Phase 3 report template. v3.0 Last edited 06/08/2021


Aim
The objective of this phase was to:

Understand the concept of force and loads, weight and loads on static applications. From these
concepts, it was then required to calculate reactions from the girders and determine reactions from
other members (columns) and the surroundings of the structure (ground). Different forces and loads
on the structure were analysed and the importance of the Australian standards was understood
during this phase.

the aim is done, leo :)

Theory & Modelling


REACTION, according to Newton’s third law is that every force has an equal and opposite reaction

i.e the force experienced by the object as a consequence of third law is the reaction.

(Source:google images)

2.The load path is simply the direction in which each consecutive load will pass through connected
members

The sequence commences at the highest point of the structure working all the way down to the
footing system, ultimately transferring the total load of the structure to the foundation

NBC1103 Phase 3 report template. v3.0 Last edited 06/08/2021


(source:google images)

3.TORQUE is the measurement of the turning force of a body, while the MOMENT is the
measurement of the perpendicular distance from the point of rotation to the force's line of action

TORQUE is denoted by τ

4.For and object that is static/ fixed

NBC1103 Phase 3 report template. v3.0 Last edited 06/08/2021


5. In order to determine the reactions at the supports (columns)
The sum of moments about a reaction point equals to zero - ΣM = 0 (i.e. the force x distance from a
point)

NBC1103 Phase 3 report template. v3.0 Last edited 06/08/2021


Supposing there are A and B vertical reactions in the beam and considering that the sum of
moments at point b is zero and then find the reaction at point A easily using formula

Force(distance)-A(distance)

For reaction at B

We can use the formula considering that the sum of vertical forces equal to 0 (ΣFy = 0)

Fy=0 = A+B-force and as we know the values of A and force we can find B

6.

For finding reactions from the ground

Formula used is

R column+ W column

Results

(excel results shown above)

R1 13.39 m R2

NBC1103 Phase 3 report template. v3.0 Last edited 06/08/2021 81.50 N


1.44 m 1.3 m
Reactions

Members Calculations

Reactions from girder Length = 13.39 m


Weight = 81.50 N
Distance from left girder to building G = 1440 mm 1.44
Distance from right girder to building E = 1300 mm 1.3 m

Reactions from each column Girder weight: 335 N ½ girder weight 0.1675

Left RC = ½ (W) + RL

kN

Right RC = ½ (W) + RR

kN

Reactions from ground RG = W(column) + R(column)

Left

kN

Right

NBC1103 Phase 3 report template. v3.0 Last edited 06/08/2021


kN

Conclusion
So using different formulas it can be said that total load on the single beam is 81.50kN and the udl as
4.2 kN/m

Provided length of the bridge as 13.39 m

Acknowledgements

https://skyciv.com/docs/tutorials/beam-tutorials/determine-the-reactions-at-the-supports/
https://byjus.com/physics/difference-between-torque-and-moment/
https://www.dlsweb.rmit.edu.au/Toolbox/buildright/content/bcgbc4010a/01_loads_loading/01_pri
mary_loads/page_008.htm

NBC1103 Phase 3 report template. v3.0 Last edited 06/08/2021

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