PE Civil Practice: Definition of Dynamic Load Allowance

NCEES Civil PE Specification Analysis of Structures–Loads and Load Applications: Moving Loads

Problem

What does the term "dynamic load allowance" signify in the context of moving loads on structures?

Select an Answer:

A) The additional load applied due to accelerations and decelerations of the moving load
B) The reduction in load intensity when the vehicle moves at a constant speed
C) The allowance for weight fluctuations in the moving load
D) The impact of wind forces acting on the moving vehicle

% Students Correctly Answered:

69.4%

Solution

Dynamic load allowance refers to the extra load applied on a structure due to the acceleration or deceleration of moving loads, which can significantly affect the structural response beyond the static load effects.

Imagine you're carrying a backpack while walking. When you start walking faster or slow down suddenly, you might feel an extra push or pull on your back because of the change in your speed, right? Similarly, in buildings or bridges, when heavy things like cars or trains move, their changing speed can put an extra force on the structure. This extra force is what we call "dynamic load allowance." It's like an extra weight that affects how the building or bridge responds, beyond just the regular, still weight it's designed to hold. This extra force from the speeding up or slowing down of moving things can make a big difference in how the structure holds up.

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Practice Question: Definition of Dynamic Load Allowance

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