hsn199
Civil/Environmental
- Oct 18, 2012
- 28
Hey, I'm having a project where I have two 130m-towers linked by five (7m*7m) bridges. I've excluded the cases of Rigid-Roller & Hinge-Roller after making models and analyzing them, but I'm having a difficulty in determining the best structural connectivity between Rigid-Rigid, Rigid-Hinge, & Hinge-Hinge.
These bridges have relatively comparable effect on the buildings' drift and displacement, so choosing the best connectivity will be dependent on its effect on the bridge itself.
The analysis results are as follows -considering the bridge @ Elev. 127.8 m- :
[highlight #FCE94F]Displacement of bridge due to EQ (allowable displacement= 0.7m):[/highlight] Rigid-Rigid: 0.6504 m/ Rigid-Hinge: 0.6587/ Hinge-Hinge:0.6614 .
[highlight #FCE94F]Displacement of bridge due to Wind (allowable displacement= 0.236m):[/highlight] Rigid-Rigid: 0.1963 m/ Rigid-Hinge: 0.2308/ Hinge-Hinge:0.2319.
[highlight #FCE94F]Moment @ bridge extremities due to ultimate case (KN.m):[/highlight] Rigid-Rigid: -283.3/ Rigid-Hinge: -263.711.
At the first look I though Hinge-Hinge was the best option, but at second thoughts allowing rotation on both sides of bridge doesn't seem a good idea. Also Rigidity at both ends is resulting in high moment, which leaves me with the Rigid-Hinge case.
If anybody has any thoughtful ideas, corrections, ... of what I've just said, then I'm more than thankful for him/her to share the ideas in this thread.
These bridges have relatively comparable effect on the buildings' drift and displacement, so choosing the best connectivity will be dependent on its effect on the bridge itself.
The analysis results are as follows -considering the bridge @ Elev. 127.8 m- :
[highlight #FCE94F]Displacement of bridge due to EQ (allowable displacement= 0.7m):[/highlight] Rigid-Rigid: 0.6504 m/ Rigid-Hinge: 0.6587/ Hinge-Hinge:0.6614 .
[highlight #FCE94F]Displacement of bridge due to Wind (allowable displacement= 0.236m):[/highlight] Rigid-Rigid: 0.1963 m/ Rigid-Hinge: 0.2308/ Hinge-Hinge:0.2319.
[highlight #FCE94F]Moment @ bridge extremities due to ultimate case (KN.m):[/highlight] Rigid-Rigid: -283.3/ Rigid-Hinge: -263.711.
At the first look I though Hinge-Hinge was the best option, but at second thoughts allowing rotation on both sides of bridge doesn't seem a good idea. Also Rigidity at both ends is resulting in high moment, which leaves me with the Rigid-Hinge case.
If anybody has any thoughtful ideas, corrections, ... of what I've just said, then I'm more than thankful for him/her to share the ideas in this thread.
