"Differential Shrinkage"
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Based on my understanding,for differential temperature, if the bridge is in simply supported system, only primary stress will be considred as restraints at both end of the beam is released by relaxing axial force and bending moment. When the bridge is continous, secondary stress will come in. According to Hambly's book, differential shrinkage shall have the same effect that of temperature. If that is the case, for simply supported bridge, is the stress caused by differential shrinkage the same throughout all the sections of the beam. Let's say beam length is L, stresses at 1/8L , 2/8L, 3/8L and center of the beam are the same throughout the beam depth. I really hope someone with vast experience or knowledge can help me on this. chan555215 |
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