Reinforcing bar couplers are used in prefabricated bridge elements and systems for accelerated construction. Grouted splice sleeve connectors substructures because of the enhanced construction tolerances they offer. This paper presents a simplified modeling strategy seismic assessment precast columns connected to footings using grouted connectors. A computational model was developed validated three half-scale subassemblies tested failure. Cyclic quasi-static loading applied two one...

Shake table testing is a costly endeavor, often requiring construction of large-scale 3D specimens to allow system stability, though the focus may be solely on understanding behavior select components, subsystems, or contents. To minimize this burden future researchers using six-degree-of-freedom (DOF) Large High-Performance Outdoor Table (LHPOST6) at UC San Diego, unique Modular Testbed Building (MTB 2 ) designed and tested in variety configurations atop LHPOST6 facility. The MTB...

The writers evaluated the confinement that was provided by glass fiber-reinforced polymer (GFRP) spirals in concrete columns under axial load. Given GFRP are resistant to chloride-induced corrosion, option of replacing steel with explored determine whether this would reduce corrosion vertical bars hybrid columns. investigated load behavior 10 spirally reinforced Six 254-mm diameter were confined a spiral and four spiral. Some utilized (hybrid columns), whereas others (all-GFRP columns)....

| PCI Journal 80 Accelerated bridge construction incorporates innovative techniques and materials to efficiently reduce time traffic disruption. It also improves work-zone safety for workers commuters. Prefabrication of structural components is a highly effective technique one the accelerated methods promoted by Federal Highway Administration under category prefabricated elements systems. Several bridges have been built or rehabilitated using methods. Examples in Utah include Interstate 15...

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The behavior of slender high-strength concrete columns reinforced with glass fiber-reinforced polymer (GFRP) bars and spirals subjected to concentric eccentric axial loads was evaluated. Large-scale tests were conducted for nine circular (three short six slender) internal GFRP-spirals either steel, GFRP, or a combination steel GFRP longitudinal bars. had slenderness ratios equal 10 49, respectively. Axial load placed concentrically (short columns) at two eccentricities (slender observe the...

The rehabilitation of RC columns jacketed with carbon fiber-reinforced plastic (FRP) composites for improving shear strength, confinement, and ductility has received considerable attention. However, research the capacity beam-column T-joints using FRP composite materials is still in early stages. present paper describes experimental results 14 1/3-scale tests concrete joints. variables considered were system, fiber orientation, surface preparation. have demonstrated viability their use...

An experimental research program is described regarding the use of externally applied carbon fiber-reinforced plastic (CFRP) jackets for seismic rehabilitation reinforced concrete interior beam-column joints, which were designed gravity loads. The joints had steel reinforcement details that are known to be inadequate by current codes in terms joint shear capacity due absence transverse hoops and bond beam bottom reinforcing bars at joint. Lap splicing using longitudinal CFRP composite...

This study evaluated the potential benefits of using buckling-restrained braces (BRBs) to seismically rehabilitate straight bridges. For this purpose, a three-span RC box girder bridge was used as case study. A three-dimensional model developed software incorporate BRBs between bent columns. The BRB inelastic behavior represented Menegotto–Pinto reproduce its isotropic and kinematic strain-hardening properties. Nonlinear time-history analyses were performed assess seismic performance...

A new methodology for seismic design is proposed based on structural optimization with performance-based constraints. Performance-based criteria are introduced the of buildings. These derived from National Guidelines Seismic Rehabilitation Buildings (Reference [19], Federal Emergency Management Agency (FEMA), 'NHERP rehabilitation buildings', Report Nos 273 and 274, Washington, DC, 1997) retrofitting existing structures. The takes into account non-linear behaviour structure. goal to...

Beam-column joints of nonductile reinforced concrete buildings that were built prior to the current seismic code provisions have been investigated using several performance-based criteria. Four half-scale exterior tested investigate their behavior in a shear-critical failure mode. The subjected quasi-static cyclic loading, and performance was examined terms lateral load capacity, drift ratio, axial reduction column at high ratios, joint shear strength, ductility, deformation angle joint,...

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The grouted splice sleeve (GSS) connection is considered to be an effective bending moment–resisting between precast RC members. This type has been used extensively in nonseismic regions. application of such a moderate or high seismic regions investigated and for multistory moment frame buildings highway bridges. A computational modeling strategy proposed at local global levels developing appropriate model using recessed GSS with intentional debonding. capable predicting the structural...

The experimental performance and numerical analysis of a hybrid two-column bridge bent was examined to evaluate its ability self-center dissipate hysteretic energy during earthquakes. experiment conducted using quasi-static cyclic loads on scaled specimen with posttensioning bars for self-centering stretch length anchors dissipation. Posttensioning were used connect the cap beam, columns, footings without any mild steel reinforcing crossing beam-to-column column-to-footing interfaces. number...

In situ lateral load tests of two bridge bents were conducted on Interstate 15 to determine the strength and ductility an existing concrete improvements that can actually be achieved using a CFRP (carbon fiber reinforced polymer) advanced composite retrofit. The design retrofit was developed based rational guidelines for columns, cap beam, beam-column joints double displacement as-built bent. able strengthen effectively increase in shear stresses 35%, while peak capacity increased by 16%....

The optimal design of trusses subjected to loads considered be uncertain in both magnitude and direction is investigated. A non-probabilistic ellipsoidal convex model established for considering the uncertainties using three different criteria. described as a set constraints on upper lower limits load magnitudes directions. performed two optimization objectives. first objective function minimized structural volume; are imposed stresses buckling members joint displacements. Another selected...