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Mechanical Property Test for Reactive Powder Concrete Columns under Eccentric Compression
(1 School of Civil Engineering and Architecture, Central South University, Changsha 410075; 2 National Engineering Laboratory for Construction Technology of High Speed Railway, Changsha 410075)
Abstract To discuss the feasibility of reactive powder concrete (RPC) materials used for shield tunnel segments, the bearing features of RPC columns with and without steel fibers are determined for different section dimensions,reinforcement ratios and compressive strengths by performing a large eccentric compression test of 22 RPC columns.The distribution characteristics of the strain of the section over the test columns are obtained under various loading conditions. The results indicate that the section strain behavior of test columns under eccentric compression is coincident with the plane-section assumption and the thickness of a shield tunnel segment can be decreased significantly if RPC material is used; section thickness has the most significant influence on the bearing capacity of the RPC column; as the compressive and tensile strength of the RPC column increases, the action of the steel bar’s bearing capacity is weakened and the reinforcement can be appropriately reduced in an RPC column under eccentric com? pression.
Abstract：
To discuss the feasibility of reactive powder concrete (RPC) materials used for shield tunnel segments, the bearing features of RPC columns with and without steel fibers are determined for different section dimensions,reinforcement ratios and compressive strengths by performing a large eccentric compression test of 22 RPC columns.The distribution characteristics of the strain of the section over the test columns are obtained under various loading conditions. The results indicate that the section strain behavior of test columns under eccentric compression is coincident with the plane-section assumption and the thickness of a shield tunnel segment can be decreased significantly if RPC material is used; section thickness has the most significant influence on the bearing capacity of the RPC column; as the compressive and tensile strength of the RPC column increases, the action of the steel bar’s bearing capacity is weakened and the reinforcement can be appropriately reduced in an RPC column under eccentric com? pression.
2017, Vol. 54 