Seismic CFST Column-to-Precast Cap Beam Connections for Accelerated Bridge Construction

Stephens, Max T.; Berg, Lisa M.; Lehman, Dawn E.; Roeder, Charles W.

doi:10.1061/(asce)st.1943-541x.0001505

Cited by 30 publications

(11 citation statements)

References 5 publications

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“…Precast concrete columns can be categorized as: ( i ) emulative columns and ( ii ) nonemulative columns. Emulative columns are those whose connections to the bent cap and foundation (and between segments of the column) are designed to emulate the monolithic cast‐in‐place reinforced concrete (RC) column connections 10–19 . Similar to cast‐in‐place RC columns, emulative columns experience damage and large residual deformations during strong ground shaking 20 .…”

Section: Introductionmentioning

confidence: 99%

Experimental testing of hybrid sliding‐rocking bridge columns under torsional and biaxial lateral loading

Salehi

Sideris

Liel

2021

Earthq Engng Struct Dyn

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Hybrid sliding-rocking (HSR) bridge columns are precast concrete segmental columns with unbonded posttensioning, end rocking joints, and intermediate sliding joints. Having been developed for construction in seismic regions, HSR columns offer self-centering, energy dissipation, and low damageability. Recent advances in the computational modeling of HSR columns have resulted in the proposal of a number of refinements to their original design, leading to the introduction of Second-Generation HSR columns. Compared to First-Generation HSR columns, Second-Generation HSR columns use a reduced number of sliding joints made of high-performance polytetrafluoroethylene (PTFE) materials to provide desirable levels of sliding and frictional energy dissipation. The seismic performance of Second-Generation HSR columns was recently investigated through an extensive experimental study. The present paper discusses the major results of the tests performed on two half-scale HSR column specimens under combined lateral-torsional loading and biaxial lateral loading to demonstrate their performance under such loading scenarios. A variety of loading protocols were used to test each column specimen, including both cyclic and arbitrary paths. Both columns sustained minimal damage under displacement demands representing 975-and 2475-year seismic hazards, meeting their design objectives.Because of the torsional sliding at sliding joints, the column subjected to lateraltorsional loading did not exhibit any distinct torsional damage. The biaxial lateral loading was, however, found more damaging to HSR columns than torsional and uniaxial lateral loading.

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Section: Introductionmentioning

confidence: 99%

Experimental testing of hybrid sliding‐rocking bridge columns under torsional and biaxial lateral loading

Salehi

Sideris

Liel

2021

Earthq Engng Struct Dyn

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“…Regarding research on beam-to-column joints, previous work is mainly focusing on that with conventional circular or square CFST columns, including the joints with external diaphragms (Chen and Chung 2003, Li and Han 2011, Rezaifar and Younesi 2017) [26~28] , that with bolted connections (Lee et al 2012, Tao et al 2017 2017) [29~31] and with other configurations (Stephens et al 2016) [32] . Investigations on beam-to-column joints fabricated with the specially-shaped composite columns are rather limited.…”

Section: Introductionmentioning

confidence: 99%

Behaviour of Reinforced Joints Between Steel Beam and L-Shaped Wide Limb Composite Column

2021

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Specially-shaped composite columns have attracted more and more attention from either industry or academia, due to their benefits for improving efficiency of use and design of indoor space. This paper presents a research programme on the seismic behaviour of an innovative joint between steel beam and L-shaped wide limb composite column (LSWL-CC). Two full-scale cyclic loading tests are introduced, with failure modes, cyclic behaviour, ultimate capacities, rotation performance, ductility, and energy dissipation being clarified. By using SolidWorks, a parametric model of the joints between steel beams and LSWL-CCs is established, and effects of various parameters are analysed by finite element (FE) analyses through ABAQUS. The FE model is validated against the test results. Furthermore, effects of geometry of the RVPs and the column axial compression ratio on the stiffness, bearing capacity, plastic zone and ductility of the joints are analysed. It is found that, triangular RVPs can make the joints possess similar seismic performance compared with the specimens using trapezoid RVPs. It is suggested to locate the RVPs within the width of the flange in case of the beams and columns having identical width. In addition, optimised geometry of the RVPs with a curved e dge may lead to better deformation performance for the joints. Specifically, length of the RVP is suggested to be 1.0~1.2 times height of the beam, its height shall be 1/4 ~ 1/3 of the steel beam height, and its thickness shall be 1.2 times that of the bea m flange. The research outcomes may provide valuable information for further research on structures with the L-shaped columns and the joints, and may promote their practical application.

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“…15,16 Concrete filled steel tube (CFST) column has been widely used in high-rise buildings, pile foundations, and bridge piers. [17][18][19][20][21][22][23][24][25][26][27] Recently, the CFST columns with the infilled recycled aggregate concrete (RAC) were developed to reduce the industrial wastes. [28][29][30][31][32][33] Nevertheless, the shrinking cracks in the CFST columns with the ordinary concrete or RAC is evident, which will reduce the structural capacity.…”

Section: Introductionmentioning

confidence: 99%

Mechanical behavior of self‐stressing steel slag aggregate concrete filled steel tubular stub columns

Fang

Zhang

et al. 2020

Structural Concrete

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The mechanical behaviors of the self‐stressing steel slag aggregate concrete filled steel tubular (SSSACFST) stub column are investigated for practical structural applications. Twelve specimens under axial and eccentric compression are tested. The influences of different parameters, such as the eccentricity, the diameter–thickness ratio of the steel tube and the expansion rate of the steel slag aggregate concrete (SSAC) are studied. The experimental results show that the shear and the bending deformation dominate the failures of the specimens under axial and eccentric compression, respectively. The column with a high diameter–thickness ratio has a low ultimate bearing capacity and ultimate strain. The incremental range of the load capacity and the ultimate axial and circumferential strains of the specimens will be increased by raising the expansion rate of the SSAC. Based on the experimental results, the applicability of the current concrete filled steel tube design provisions for the SSSACFST stub columns is evaluated, and two analytical models for predicting the bearing capacity of the SSSACSFT stub columns under axial and eccentric compression are proposed.

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Seismic CFST Column-to-Precast Cap Beam Connections for Accelerated Bridge Construction

Cited by 30 publications

References 5 publications

Experimental testing of hybrid sliding‐rocking bridge columns under torsional and biaxial lateral loading

Experimental testing of hybrid sliding‐rocking bridge columns under torsional and biaxial lateral loading

Behaviour of Reinforced Joints Between Steel Beam and L-Shaped Wide Limb Composite Column

Mechanical behavior of self‐stressing steel slag aggregate concrete filled steel tubular stub columns

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