Performance of SteelPolymer Concrete Composite Structural Elements


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Title: Performance of SteelPolymer Concrete Composite Structural Elements

Author(s): C. Vipulanandan, S. T. Mau, Syam K. Mantrala, and S. Wei

Publication: Special Publication

Volume: 166


Appears on pages(s): 17-36

Keywords: compression; ductility; models; modulus of elasticity; polymer concrete; sandwich structures; steel construction; strains; strength; Structural Research

Date: 12/1/1996

There is an interest in developing better performing (high strength and ductility) composite structural elements for construction and repair of onshore and offshore structures. In this study, composite structural elements that consist of filled columns and sandwich columns (two concentric circular steel tubes with polymer concrete sandwiched in between) were investigated as potential compression members. High-strength (480 Mpa) and low-strength (200 MPa) steel tubes conforming to ASTM A513 Type 5 and ASTM A500 Grade B, respectively, were used. The polymer concrete was polyester based with a compressive strength of 60 Mpa. Short composite columns, made of steel tubes of diameter-to-thickness ratios ranging from 16 to 170, were tested under monotonically increasing axial compression. It was observed that the composite columns had compressive strengths of 10 to 30 percent higher than that of the summation of the individual components. The ductility was much higher than that of the corresponding steel tubes. Relationships for predicting the initial modulus and peak load and corresponding strain of the sandwich column have been developed. A simple model was used to predict the load-strain history up to the peak load of the composite elements. The predictions agreed well with the test results.