Program Eksperimental Perilaku Siklik Pilar Persegi Berongga Jembatan dengan Beton Berkekuatan Ultra Tinggi

Abstract

This paper discusses the hysteretic behavior of Hollow Rectangular Section Piers (HRSP) by applying Ultra High Strength Concrete (UHSC) material. The experimental program conducted in two models of HRSP-UHSC specimens were loaded by combination of a constant axial compression force and quasi static lateral cyclic loads through actuators on the loading frame. The lateral loads were based on displacement controls in ACI 374.1-05 (2005). The constant axial compression forces were applied into the HRSP-70 and HRSP-60 of 0.075fc’Ag and 0.15fc’Ag, respectively. The experimental results indicate that the increasing of the axial compression force ratio enhances the shear strength significantly, but then it experiences higher strength degradations with lower attainment of drift ratio and displacement ductility factor. The HRSP-70 achieved a displacement ductility factor of 5.35 at drift ratio of 5.80%, while HRSP-60 achieved a displacement ductility factor of 4.58 at drift ratio of 3.50%. This trend resulted that HRSP-70 was able to accommodate the stiffness degradation of the first yield state to the ultimate conditions up to 82.99%, while the HRSP-60 was only about 77.86%. Similarly, the energy dissipation of HRSP-60 decreased by 39.46% after the constant axial compression force had been increased 50% from previous specimen.

Keywords

• HRSP-UHSC
• Hysteretic behavior
• Displacement ductility
• Strength degradation