The structural behavior of instrumented cast-in-situ reinforced concrete bored piles when subjected to lateral movements due to deep excavation has been monitored and studied. The most important structural parameter required, from the design standpoint for bored piles, is the magnitude of bending moment induced in the pile in such situations. Two methods have been used to derive the bending moment induced in instrumented bored piles. In the first method, which is a direct method, strain readings measured via strain gauges installed along the pile depth were used to back-analyze the induced bending moment. In the second method the deflection profile measured via inclinometers installed in the bored piles were used to backanalyze the bending moment. In this paper the results obtained and the comparison of the bending moments obtained from the two different methods are discussed. From this discussin, an idea of the pile elastic modulus and moment of inertia that can be generally used to determine the bending moment from pile lateral deflection profiles is further explored and discussed.
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