slickdeals
Structural
- Apr 8, 2006
- 2,268
Pardon me if this comes across as a naive question.
Assume I have a 3 span continuous beam (each span say 40') in which the sequence of construction is such that the two end spans are built first and then cantilever towards each other in the mid span. Assume the final piece that gets put is rather short (say 4') so as to maximize cantilever moment. The final piece is a full moment connection.
What happens to the negative moment (and stresses) at the supports after this piece is put in? The cantilevered moment is more than the continuous beam moment. Does the system compensate for the addition of the middle member? I presume it will if the system is elastic. Are there any locked-in stresses?
Thoughts?
Assume I have a 3 span continuous beam (each span say 40') in which the sequence of construction is such that the two end spans are built first and then cantilever towards each other in the mid span. Assume the final piece that gets put is rather short (say 4') so as to maximize cantilever moment. The final piece is a full moment connection.
What happens to the negative moment (and stresses) at the supports after this piece is put in? The cantilevered moment is more than the continuous beam moment. Does the system compensate for the addition of the middle member? I presume it will if the system is elastic. Are there any locked-in stresses?
Thoughts?