Experimental Investigation of the Hybrid FRP-UHPC-Steel Double-Skin Tubular Columns under Lateral Impact Loading

Abstract

The lateral impact behavior of hybrid fiber-reinforced polymer (FRP)-ultrahigh-performance concrete (UHPC)-steel double-skin tubular columns (DSTCs) was experimentally investigated in this study. Seven specimens, which had an outer diameter of 168 mm and a length of 2,000 mm, were tested under lateral impact loading. Different parameters, including the axial force level, impact energy, concrete type, void ratio, FRP tube thickness, and the presence/absence of the FRP tube, were investigated. The dynamic responses, including global/ local damage modes, lateral deflection-time histories, impact force-time histories, strain-time histories, and acceleration-time histories, were investigated. The test results prove that the hybrid UHPC DSTCs exhibit very ductile behavior under lateral impact loading. The hybrid UHPC DSTCs have a higher lateral impact resistance capacity as compared to the hybrid DSTCs infilled with normal-strength concrete. The lateral impact resistance capacity of hybrid UHPC DSTCs with an applied axial force of 200 kN can be improved to some extent compared with those without any axial force. The impact energy, the void ratio, the FRP tube thickness, and the presence/absence of the FRP tube can significantly affect the lateral impact behavior of hybrid UHPC DSTCs. Furthermore, the lateral impact behaviors of hybrid DSTCs, concrete-filled double-skin steel tubes (CFDSTs), and concrete-filled steel tubes (CFSTs) were compared and discussed based on the experimental results in this study as well as in other literature studies.

A State-of-the-Art Review of FRP-Confined Steel-Reinforced Concrete (FCSRC) Structural Members

“…Therefore, it is generally not an economic option to construct pure FRP structures in practical applications. To this end, the combined usage of FRP composites and traditional construction materials (including steel and concrete) has attracted more and more attention in the research community [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31], with the aim to establish cost-effective and novel forms of structures with excellent structural performance.…”

Axial compressive behavior of ultra‐high performance concrete‐filled double skin high‐strength steel tubular short columns

“…When compared with ordinary concrete or high-strength concrete, UHPC was superior in compressive and tensile strength, toughness, and durability, and had good application prospects. Wang et al 17,18 conducted an experimental program on the compressive behavior and impact resistance of hybrid fiber-reinforced polymer concrete-steel double-skin tubular columns with ultra-high performance fiberreinforced concrete, the test results showed that the hybrid UHPC DSTC had good ductility under lateral impact load. Some scholars have also studied the axial compressive properties of CFDST filled with different fillers, such as grout, 19 recycled aggregate concrete, 20 and coral concrete.…”

Compressive Behavior of FRP Grid-Reinforced UHPC Tubular Columns

“…A number of studies have been conducted on enhancing or understanding the mechanical properties of UHPC [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 ]. Although UHPC has a number of advantages, widespread usage of UHPC has not been achieved and UHPC has only been used in structures for particular purposes (e.g., low-weight, large-span structures, fatigue strengthening of bridge decks, or durability upgrading of structures in harsh marine environments) [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ] due to a lack of design codes [ 20 ].…”