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Showing 1 to 20 of 34 for “"Plastic Hinge"”.
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Analytical Development of A Plastic Hinge Detail for Steel SMFs
A modular plastic hinge seismic special detail has been developed for use in steel special moment frames (SMFs). The aim of the special detail design is to dissipate seismic energy through stable yielding of a beam "link" in plastic hinge region. Reliable and repeatable energy dissipation at high …
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Evaluating the Effect of Decking Fasteners on the Seismic Behavior of Steel Moment Frame Plastic Hinge Regions
A series of full-scale beam-to-column moment connection tests were completed to determine the effects of powder actuated fasteners (PAF) and puddle welds on the seismic behavior of steel moment connections. In seismic regions, PAF are currently prohibited in the connection region (referred to as …
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Design of One-Story Hollow Structural Section (HSS) Columns Subjected to Large Seismic Drift
… using three design methods: elastic design, plastic hinge design, and pinned base design. First, for elastic design, the compression and flexural strength of the HSS columns are calculated according to the AISC specifications, and the story drift ratio that causes the interaction equation to …
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Limit Analysis and Shakedown in Plane Frames and Plane Stress Problems
… the shakedown load factor for elastic, perfectly plastic plane frames subjected to cyclic loading or random loads varying between fixed limits. The essential feature of the method is the employment of an automatic force method of elastic analysis which provides self-stress systems for the frame. …
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Application of SMA fiber composite as seismic reinforcement for concrete moment resisting frames
… bars have tendency to incur permanent plastic deformations under excessive loading. Recently, fiber reinforced polymer (FRP) reinforcing bars have also been used in concrete structures to address corrosion issues typically associated with conventional steel bars. However, due to their …
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Seismic Performance of Square Nickel-Titanium Reinforced ECC Columns with Headed Couplers
… costs to a minimum by reducing damage to column plastic hinges and minimizing residual drifts. These objectives can be accomplished by using innovative materials such as Nickel-Titanium shape memory alloy bars (SMA) and engineered cementitious composites (ECC). This study focused on evaluating …
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Experimental Studies of Reinforcing Steel and Shape Memory Alloys in Mechanically Spliced Connections for Seismic Application
… reinforcing bar splices for use in the plastic hinge of a bridge column for use in accelerated bridge construction (ABC). The implementation of couplers in a plastic hinge for ABC is not unique, however coupler application has been limited to regions of low seismic hazard due to lack of …
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Unified Design of Extended End-Plate Moment Connections Subject to Cyclic Loading
… inelastic deformations through formation of a plastic hinge adjacent to the connection region. The proposed design procedure was used to make comparisons with ninety experimental tests conducted over the past twenty-six years. A limited finite element study was conducted to investigate the …
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Assessment of Foundation Rocking Behavior in Reducing the Seismic Demand on Horizontally Curved Bridges
… Considered Earthquake (MCE), only cracks at the plastic hinge areas of the columns were observed without spalling of concrete. The rotation of the pier under the lateral loading was distributed between the footing rotation and the column rotation. This resulted in an essentially elastic behavior …
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Performance of RC Bridge Columns under Cyclic Combined Loading including Torsion
… The torsional and flexural hysteretic responses, plastic hinge formation, strength and stiffness degradation, rotation and displacement ductility limits, energy dissipation characteristics, and damage progression for these columns are discussed in this dissertation. A unified damage assessment …
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Development and Validation of a Twelve Bolt Extended Stiffened End-Plate Moment Connection
… The specimens that were designed to form a plastic hinge in the beam fractured in a brittle manner. The deep beam specimen fractured in the first 2% story drift cycle, and the shallow beam specimen fractured in the second 3% story drift cycle. The fracture of the prequalification specimens …
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Elasto-plastic stress analysis of curved structures with rectangular section
… important. By applying the methods of plastic analysis, the collapse load of a structure can be determined, and also the stress distribution and the deflection, just before collapse, can be calculated. However the evolution of the stress distribution and the deflection at any section of …
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Effect of Viscous Fluid Dampers on Steel Moment Frame Designed for Strength and Hybrid Steel Moment Frame Design
… moment frame for that bay. By varying the plastic hinge capacities across the same level stories, four different Hybrid Frame designs were obtained. Nonlinear static pushover analysis was applied to these frames, and as expected, the more reduction in the plastic capacity of the Hybrid …
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A Low Cycle Fatigue Testing Framework for Evaluating the Effect of Artifacts on the Seismic Behavior of Moment Frames
… on special moment resisting frame (SMRF) plastic hinge regions using relatively economical coupon tests. Cyclic bend tests and monotonic tension tests on flat plate coupons that include artifacts are used to calibrate fracture parameters for different low cycle fatigue models such as the …
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Response of Wide Flange Steel Columns Subjected to Constant Axial Load and Lateral Blast Load
… Changes in displacement time histories and plastic hinge formations resulting from varying the axial load were examined. The cases studied include single-span and two-span columns. In addition to ideal boundary conditions, columns with linear elastic, rotational supports were also studied. …
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Seismic Performance of Column-to-Drilled-Shaft Connections in Reinforced Concrete Bridges
… in the column placement and to facilitate plastic hinge formation in the column rather than in the shaft. The column-shaft connection, which involves a noncontact splice between the column and shaft bars, is a key component in this structural system. However, there is limited research on …
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Seismic retrofit and repair of reinforced concrete bridge columns using shape memory alloy spirals
… active confinement pressure at the column’s plastic hinge zone to enhance the flexural ductility of vulnerable columns and limit their post-earthquake damage. Although research has proven that concrete active confinement is a more superior technique to passive confinement, its field …
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Techniques of seismic retrofitting for concrete structures
… with lack of confinement as well as lap-slice in plastic hinge regions creating potential failures in flexure strength and/or ductility, and in shear. Other critical structural elements include, but are not limited to, gravity design frames, footings, shear walls, connections, and beams. There are …
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Inelastic Dynamic Behavior And Design Of Hybrid Coupled Wall Systems
… drift, shear distortion, coupling beam plastic rotation, and wall rotation. Different performance measures are proposed to judge and compare the behavior of the various systems. The analyses show that, in general, hybrid coupled walls are particularly well suited for use in regions of …
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Performance of RC Columns Retrofitted with UHPFRC Jackets Under Cyclic Displacement Reversals
… seismic excitation on the columns, and the plastic hinge zone was repaired through cover replacement with a thin commercial-grade UHPFRC jacket, as well as bond breakers placed on the starter bars of the lap-spliced connection. Through experimental testing, the behavior of the columns was …
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