i have frequencies of bridge that are effected by mass of vehicle. the problem is when any vehicle pass the bridge it would add the its mass to the bridge mass ultimately mass of the bridge will increase. so in general situation the frequency should be decrease when mass will increase but i am getting higher frequencies when vehicle is passing and lower frequencies when vehicle have passed. kindly suggest anything for this problem
thanks
Could you provide some more information about the bridge type and its construction? Is it a steel truss bridge, concrete beam, cable-stayed or whatever? Details of the support conditions?
What is the final goal?
Are you worried about resonances or study load/vibration induced stresses?
Are you looking for numerical solutions/simulations or analytics?
If this is about resonances, start with natural modes of the bridge per se (e.g., in "frequency" analysis in SolidWorks). Then look in the literature to get a feeling on what the Q-factor might be. One can think of the Q-factor as the amplification factor: vibrations within the natural modes bands (roughly Lorentzian) will be amplified Q-times, the rest frequencies will not. Then add the extra load of vehicles, and think of it as if you tighten a guitar string. And so on.
If you are studding stresses, upgrade your SolidWorks simulation to premium, and calculate the frequency response in "dynamic analysis".
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