ABSTRACT

Integral bridges are progressive constructions with decreased maintenance costs. However, they are subject to cyclical horizontal movements because of thermal expansion and contraction. Expansion is typically more important in process of abutment design, as it causes passive earth pressures, which have much higher effect on the abutment than active pressures. By placing a layer of easily compressible material behind the abutment, this effect can be decreased significantly. Typical material for such layer is expanded polystyrene. This article presents the results of experimental verification of mechanical properties of this material. Specimens with 7 different densities were examined in both triaxial and compression machine, with maximal strain induced 60%. In one case, specimen was also exposed to cyclical loading.