Evaluation of As-Built, Retrofitted, and Repaired Shear-Critical Hollow Bridge Columns under Earthquake-Type Loading

Concrete contribution to initial shear strength of RC hollow bridge columns

“…With respect to the shear effective area for RC hollow columns subjected to cyclic lateral loading, 0.8A g was adopted based on the comparison between the shear strengths of H40A2.0 and H40A2.0C, as used in most of the other shear models. Based on the aforesaid findings, it is proposed that the initial shear strength (V c ) of RC hollow columns owing to concrete only may be assessed by It should be noted, however, that the proposed effect of column aspect ratio ( ) is based on the limited number of hollow column tests, due to the lack of available hollow column specimens that failed in premature shear mode; almost all hollow column specimens reported in literature (Yeh et al 2002, Mo et al 2003, Mo et al 2004, Cheng et al 2005 developed relatively ductile plastic hinging before ultimate shear failure, if any. Also, the effect of longitudinal steel ratio on the concrete shear contribution is not explicitly embodied in the proposed model due to the lack of data.…”

“…However, all of them were primarily based on experimental tests for columns with solid sections. Only a few studies (Yeh et al 2002, Mo et al 2003, Mo et al 2004, Cheng et al 2005 have been conducted for the seismic performance assessment or the earthquake-resistant design of RC hollow columns. Moreover, little investigation was made on the initial shear strength of such columns; almost all hollow column tests reported in the literature showed relatively ductile behaviour engaging plastic hinging mechanism, before ultimate shear failure if any.…”

Structural performance and corrosion resistance of fiber reinforced polymer wrapped steel reinforcing bars

“…FRP materials have been used in a variety of ways, including as exterior wraps in both new structures and as a retrofit method, as a layer of reinforcement, usually the exterior layer for corrosion resistance, and in bar or rod form to take the place of traditional steel reinforcement. The use of FRP wraps as a retrofit method for bridges has been studied by Zanardo et al (2004), Haroun and Elsanadedy (2005), and Cheng et al (2005) to name a few. A state of the art review of FRP materials used in civil and structural applications was performed by Hollaway (2010).…”

Reinforcement Corrosion in RC Hollow Piers: Destructive and Non-Destructive Tests

“…The negative element for this type of structure is the considerable deformation due to shear, which also represents considerable percentage of the total displacement at the top of the pier [ 3 ]. Numerous experimental studies have addressed the problem of the effect on piers of cyclic forces from wind and vehicular traffic: the effect is a combined shear and bending effect or shear failures at the base for both circular and rectangular sections [ 4 , 5 , 6 ]. A wide variety of literature also exists for hollow sections, and, in addition, previous studies [ 7 , 8 , 9 ] have also detected several factors (namely, inner to outer cross-section dimensions, axial load ratio, longitudinal and transverse reinforcement ratios) that influence the seismic behaviour of the bridge piers, referring to the real geometries of the RC hollow structures.…”