Optimum design of piles with pre-hole filled with high-damping material: Experimental tests and analytical modeling. Issue 151 (December 2021)

• Record Type: Journal Article
• Authors: Xue, Junqing; Aloisio, Angelo; Lin, Yibiao; Fragiacomo, Massimo; Briseghella, Bruno
• Is Part Of: Soil dynamics and earthquake engineering. Issue 151(2021)
• Publication Date: 2021-12
• Subjects: Integral abutment bridge -- Soil-structure interaction -- Structural dynamics -- Reinforced concrete piles -- Experimental tests -- Hysteresis modeling; Soil dynamics -- Periodicals; Earthquake engineering -- Periodicals; Sols -- Dynamique -- Périodiques; Génie parasismique -- Périodiques; 624.176205
• DOI: 10.1016/j.soildyn.2021.106995
• Languages: English
• ISSNs: 0267-7261

Abstract

Abstract: The piles represent the most vulnerable structural components in Integral Abutment Bridge (IAB). They must adsorb the thermal deformation and the seismic loading transferred from the superstructure to the substructure. The use of pre-holes filled with high-damping material represents a possible solution for enhancing the dissipative performance of reinforced concrete (RC) piles in IABs. This paper presents the experimental tests of four RC pile specimens backfilled with different damping material to assess their effect on the soil-structure hysteretic response. The authors developed a physical hysteresis model of the soil-pile interaction to assess the optimum length of the damping pre-hole. Firstly, the model is calibrated to the experimental tests. Then the authors extrapolated the hysteresis models to full-scale specimens to estimate their optimum design in practical applications. Highlights: Experimental tests of piles with pre-hole filled with high-damping material. The use of rubber particles or foam reduces pinching effects due to soil and reinforced concrete. The experimental backbone is independent of the damping features of the soil. Development of a physical hysteresis model of the soil-pile interaction based on a Winkler plane beam. The optimum length of the pre-hole ranges between 0.1% and 0.15% the pile length.