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Bridge

Understanding Creep Analysis Through Flexibility Methods

Table of Contents Click the table of contents for details.

Creep Analysis 3



The blog article of Creep Analysis 3 showed how Dr. Ghali et al. explained the creep analysis by flexibility methods.


To better understand the creep behavior, solve the previous example in a less efficient way. Here, different sign conventions will be applied.

 

 
Sign Convention
Sign Convention
 

At time t0, the immediate displacements/rotations for member 1 due to uniform loads are

 

At time t0, the immediate displacements rotations for member 1 due to uniform loads

At time t1, the immediate displacements/rotations due to uniform loads at span 2 are (MIDAS file ex4.2A)

 

At time t1, the immediate displacements rotations due to uniform loads at span 2

The signs in the table are according to the global axis. Converting into element local axis,

 

The signs in the table are according to the global axis

Restrained displacements/rotations are

 

Restrained displacements rotations_1

Restrained displacements rotations 2

Let

Restrained displacements rotations 3

Restrained member end forces are

 

Restrained member end forces

The remaining calculations are the same as the previous example.

 

About the Editor
Seungwoo Lee PhD, P.E., S.E.
Senior Supervising Engineer at WSP USAs (Tampa, FL)

He is a Senior Supervising Engineer with a high level of expertise in the design and analysis of suspension bridges. He has a solid fundamental understanding of structures and can apply his knowledge exceptionally well to the design and analysis of highly complex structures. He is also a strong communicator, able to identify and distill the key information that is relevant to the task at hand and present it in a clear and quickly understandable manner.

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