A simple log bridge in a remote area consists of two parallel logs with planks across them (see figure). 934 N/m 338 mm -2.5 m Ⓡ The logs are Douglas fir with an average diameter 338 mm. A truck moves slowly across the bridge, which spans 2.5 m. Assume that the weight of the truck equally distributed between the two logs. Because the wheelbase of the truck is greater than 2.5 m, only one set of wheels is on the bridge at a time. Thus, the wheel load on one log is equivalent to a concentrated load W acting at any position along the span. In addition, the weight of one log and the planks it supports equivalent to a uniform load of 934 N/m acting. on the log. Determine the maximum permissible wheel load W (in kN) based upon the following. (a) an allowable bending stress of 7.0 MPa KN (b) an allowable shear stress of 0.75 MPa KN
A simple log bridge in a remote area consists of two parallel logs with planks across them (see figure). 934 N/m 338 mm -2.5 m Ⓡ The logs are Douglas fir with an average diameter 338 mm. A truck moves slowly across the bridge, which spans 2.5 m. Assume that the weight of the truck equally distributed between the two logs. Because the wheelbase of the truck is greater than 2.5 m, only one set of wheels is on the bridge at a time. Thus, the wheel load on one log is equivalent to a concentrated load W acting at any position along the span. In addition, the weight of one log and the planks it supports equivalent to a uniform load of 934 N/m acting. on the log. Determine the maximum permissible wheel load W (in kN) based upon the following. (a) an allowable bending stress of 7.0 MPa KN (b) an allowable shear stress of 0.75 MPa KN
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
Related questions
Question
Please answer a and b.
Transcribed Image Text:A simple log bridge in a remote area consists of two parallel logs with planks across them (see figure).
934 N/m
338 mm
-2.5 m.
Ⓡ
The logs are Douglas fir with an average diameter 338 mm. A truck moves slowly across the bridge, which spans 2.5 m. Assume that the weight of the truck is equally distributed between the two logs. Because the wheelbase of the truck is greater than 2.5 m, only
one set of wheels is on the bridge at a time. Thus, the wheel load on one log is equivalent to a concentrated load W acting at any position along the span. In addition, the weight of one log and the planks it supports is equivalent to a uniform load of 934 N/m acting
on the log. Determine the maximum permissible wheel load W (in kN) based upon the following.
(a) an allowable bending stress of 7.0 MPa
KN
(b) an allowable shear stress of 0.75 MPa
KN
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution!
Trending now
This is a popular solution!
Step by step
Solved in 5 steps with 5 images
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Recommended textbooks for you
Structural Analysis (10th Edition)
Civil Engineering
ISBN:
9780134610672
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Principles of Foundation Engineering (MindTap Cou…
Civil Engineering
ISBN:
9781337705028
Author:
Braja M. Das, Nagaratnam Sivakugan
Publisher:
Cengage Learning
Structural Analysis (10th Edition)
Civil Engineering
ISBN:
9780134610672
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Principles of Foundation Engineering (MindTap Cou…
Civil Engineering
ISBN:
9781337705028
Author:
Braja M. Das, Nagaratnam Sivakugan
Publisher:
Cengage Learning
Fundamentals of Structural Analysis
Civil Engineering
ISBN:
9780073398006
Author:
Kenneth M. Leet Emeritus, Chia-Ming Uang, Joel Lanning
Publisher:
McGraw-Hill Education
Traffic and Highway Engineering
Civil Engineering
ISBN:
9781305156241
Author:
Garber, Nicholas J.
Publisher:
Cengage Learning