The Seismic Behavior Of Multistory Frame Structures - that necessary
Deficient reinforced concrete frames in many developing countries need upgrade and effective retrofitting techniques to enhance the strength, stiffness and energy dissipation capacity of the system. This paper presents eccentric steel braces ESB retrofitting technique for deficient reinforced concrete moment-resisting frames. A nonlinear static analysis was carried out on three-story deficient and ESB retrofitted frames and the force—deformation hysteretic response was noted. The ESB retrofitted frames considerably changed the lateral forces load transfer path and as a result increased the strength, stiffness and hysteretic damping of the frames as opposed to the deficient bare frame. Furthermore, a dynamic time history analysis was performed on five and seven-story ESB retrofitted frames and story drift demands were identified. ESB retrofitted frames significantly reduced story drift demands as compared to bare frames. This is a preview of subscription content, log in to check access. The Seismic Behavior Of Multistory Frame Structures.
Chapter Architectural, Mechanical, and Electrical Components Anchored veneer and connections not conforming to the acceptance criteria of Section Heavy units may be dislodged by direct acceleration, which distorts or fractures the mechanical connections. Deformation of the supporting structure, particularly if it is a frame, may similarly affect the connections, and the units may be displaced or dislodged by racking.
Drift analysis is necessary to establish conformance with drift acceptance criteria related to performance level. Nonconformance requires limiting structural drift, or special detailing to isolate substrate from structure to permit drift. Defective connections must be replaced.
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Component Behavior and Rehabilitation Methods Glass block units and other nonstructural masonry shall be considered both acceleration- and deformationsensitive. Rehabilitation of individual walls less than square feet or 15 feet in any dimension Structtures Prescriptive Procedures based on Section of IBC shall be permitted. For walls larger than square feet or 15 feet in any dimension, the analytical procedure shall be used. Glass block units and other nonstructural masonry not conforming with the requirements of Section Life Safety Nonstructural Performance Level.
Backing shall be adequately anchored to resist seismic forces computed in accordance with Section The drift ratio calculated in accordance with Section Immediate Occupancy Nonstructural Performance Level. Backing shall be adequately attached to resist seismic design forces computed in accordance with Section The drift ratio computed in accordance with Section The anchors shall be visually inspected and tested to determine capacity if any signs of deterioration are visible.
Relationships
Failure out-of-plane takes the form of dislodgment or collapse caused by direct acceleration. Nonconformance with deformation criteria requires limiting structural drift, or special detailing to isolate the glass block wall from the surrounding structure to permit drift. Sufficient reinforcing must be provided to deal with out-of-plane forces.]
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