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<br />3. Exposed length of column with no steel reinforcement. <br /> <br />Approximately 2.4 m (8.2 feet) <br /> <br />4. Cause of failure. Contraction scour and pier scour which was <br />below the steel reinforcement in the columns. <br /> <br />5. Structural engineer concluded the exposed columns could not have <br />resisted the lateral force even without debris, <br /> <br />Steel <br />Reinforced <br />Concrete <br />Column <br /> <br />8' <br /> <br /> <br />8.5' <br /> <br />- <br />-.... <br /> <br />31' <br /> <br />6.7' <br /> <br />Locol Scour <br /> <br />15.8' <br />Remaining <br />Embedment <br /> <br />Non- <br />Reinforced <br />Concrete <br />Column <br /> <br />CROSS SECTION A-A <br /> <br />TYPICAL COLUMN BENT AND WEB WALL 1-5 BRIDGES <br /> <br />5.14 <br />