Title: Design of Bridge Pier Seismic Retrofit Using THFRC

Author(s): Ismail Mohammed, Konstantinos Tsiotsias and S. J. Pantazopoulou

Publication: Symposium Paper

Volume: 358

Issue:

Appears on pages(s): 158-178

Keywords: jacketing; performance-based design; seismic retrofit; stress-strain model; THFRC; UHPC; UHPFRC

DOI: 10.14359/51740235

Date: 9/1/2023

Abstract:
Tension-hardening fiber-reinforced concrete (THFRC) is characterized by ductile response in tension and a significant tensile strength that can be sustained to large levels of tensile strain. The strain ductility imparted by the dense network of fibers presents an opportunity in seismic design and retrofit, whereas the significant durability enabled by the low porosity of the cementitious matrix makes this class of materials ideal for bridge retrofits since they can mitigate many of the limitations of the existing approaches. However, no design provisions exist regarding the application of THFRC in seismic design and retrofit. A summary of a pertinent framework of design guidelines is presented, which are needed for determination of both seismic demands and criteria for performance-based design of THFRC based retrofits. To this end, stress-strain relationships are formulated considering the confinement effect imparted by the fiber reinforcement. Strain limits are established by reference to test data from various studies of THFRC.