Abstract
Interfacial slip can cause rigidity degradation and stress concentration in fiber-reinforced polymer-concrete hybrid beam (FCHB). Therefore, precisely evaluating the composite action between fiber-reinforced polymer (FRP) and concrete of FCHB plays a pivotal role in structural analysis and design. Previous push-out tests showed that most connections for FCHB behave nonlinearly in load-slip relationships even at a low load level. However, existing analytical equations have their limitations due to the assumption of linear load-slip interfacial relationship which is not suitable for FCHB. The originality of this paper is to propose a finite difference method (FDM) to elaborate the interfacial slip and shear stress. FDM agreed well with the analytical solutions of the linear load-slip relationships for connections. Results indicate that higher accurateness can be obtained by using more elements. And 40 elements for half span of FCHB can reduce the error of numerical results to 1%. Then, the proposed FDM was expanded to predict the interfacial behavior of FCHB considering nonlinear interfacial load-slip relationships. It was found that perforated FRP rib connections can ensure nearly full composite action and the bolted connection can lead to a very high slip level. The use of ultra-high performance concrete (UHPC) results in a higher degree of composite action than normal concrete. The deflection considering slip was computed by adding deformation under full composition action and that caused by the slip effect. It was suggested that high strength steel bolts are effective both in normal concrete and UHPC. When the slip modulus is suggested to be larger than 20 kN/mm, the capacity per bolt should be larger than 20 kN.
Highlights
IntroductionHigh strength-to-weight ratio and durability under corrosive chemical conditions have made fiber-reinforced polymer (FRP) composite materials an attractive solution to bridge members [1,2,3]
High strength-to-weight ratio and durability under corrosive chemical conditions have made fiber-reinforced polymer (FRP) composite materials an attractive solution to bridge members [1,2,3].In the last two decades, there has been an increasing interest in using FRP composites to repair andAppl
It was suggested that high strength steel bolts are effective both in normal concrete and ultra-high performance concrete (UHPC)
Summary
High strength-to-weight ratio and durability under corrosive chemical conditions have made fiber-reinforced polymer (FRP) composite materials an attractive solution to bridge members [1,2,3]. The interfacial slip between FRP and concrete is expected to be high and reduces the stiffness and capacity and fiber-reinforced polymer-concrete hybrid beam (FCHB) [19,20,25,26]. Many researchers have proposed analytical solutions to quantifying the interfacial slip of FCHB according to a linear load-slip relationship of shear connection [31,32]. A slip modulus was employed based on a chord slope of FRP-concrete push-out testing [10,14,16] This simplification is not true for most the connectors because nonlinearity occurs even at low load level which makes the chord slope different from the tangential slope [10,14,15,16,31,32,33]. Based on the computation results, existing analytical solutions using linear interfacial load-slip relationships were calibrated, and different bond-slip models are discussed
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