suspension bridge modelling

[saebamu]

i want to modelled suspension bridge, but the problem is that, if i use main cable & suspender ( cable section) mode shape not show corretly,add if i use main cable & suspender ( frame section) mode shape show corretly. what is the corret solution because cable have no bending moment but frame have bending moment.

 

[johnbridge231]

What if you use frames with decreased bending modifiers m11, m22 and m12?

Analysis and Design of arbitrary cross sections
Reinforcement design to all major codes
Moment Curvature analysis

http://www.engissol.com/cross-section-analysis-design.html

 

[stressed]

saebamu, have you evaluated the modal results when you based the modal case on the stiffness of a nonlinear P-Delta case? A nonlinear P-Delta case which includes selfweight, and perhaps some percentage of vehicle load? In a cable suspension bridge, consideration of P-Delta in the modal case could potentially make a significant difference.