Proceeding of the 2018 DFI-EFFC International Conference on Deep Foundations and Ground Improvement, Rome, Italy, (DFI, EFFC)
Experimental Studies on the Lateral Load Carrying Capacity of Pier Foundations for Bridges
Sukhmander Singh, Professor of Civil Engineering
Piers are the oldest bridge foundation for bridges in countries like India and China. Shallow pier foundation is often subjected to scour by the river. It is desirable to adopt a minimum size which will meet requirements governed by the minimum obstruction to the water way, the economy, length of the pier below the maximum scour level. This length should develop sufficient passive resistance to counteract the overturning movement due to horizontal forces acting on the bridge deck, and those due to wind and water. At IIT-Delhi, a comprehensive study was undertaken on behavior of pier foundation in sandy soils which modeled the influence of the length-to-diameter ratio on the behavior of pier foundations subjected to horizontal loads in terms of the position of the center of rotation, the maximum bending stress and the mobilized lateral soil resistance. It was found that decreasing the length-to-diameter ratio of the pier lowered the location of center of rotation and mobilized higher passive soil resistance. An increase in embedded length reduces the horizontal deflection but increases the bending stresses. The center of rotation was located at a lower level than predicted by the theoretical analysis based upon rigid bulkhead and sub-grade reaction theories.
|article #2957; publication #1040 (ROME-2018)|