Material Behavior of Ultra-High-Strength Concrete under Multiaxial Stress States

Abstract

To evaluate new fields of application of concrete structures in any processes where complex stress states occur, and to optimize concrete structure geometries regarding such applications, the material behavior of concrete under multiaxial loading has to be known. With the aim of determining the material behavior of an ultra-high-strength concrete (UHSC), 35 multiaxial stress states with primarily one tensile stress component are examined and the measured stress-strain curves are shown. Using the test results, the arbitrary parameters of a damage-based material law concerning the single-stress ratios are determined. To describe the material behavior for load-induced isotropic and orthotropic damage, an approximation of the calculated arbitrary parameters is deduced. These enable determining the material behavior of the investigated UHSC for any stress ratios. The prediction of the described material law is compared and discussed regarding the measured stress-strain curves and the maximum strength values from the tests.