Effects of Bond Deterioration on Seismic Response of Reinforced Concrete Frames PDF Download

Author: Filippos Filippou
Publisher:
ISBN:
Category : Reinforced concrete construction
Languages : en
Pages : 436

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Author: Takayuki Ishizuka
Publisher:
ISBN:
Category : Buildings
Languages : en
Pages : 898

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Author: Filip C. Filippou
Publisher:
ISBN:
Category : Concrete beams
Languages : en
Pages : 212

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Author: Anton Kivell
Publisher:
ISBN:
Category : Reinforced concrete construction
Languages : en
Pages :

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Author: Eugene Zeller
Publisher: DIANE Publishing
ISBN: 9780756706272
Category : Technology & Engineering
Languages : en
Pages : 500

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Book Description
This document from the National Earthquake Hazards Reduction Program (NEHRP) was prepared for the Building Seismic Safety Council (BSSC) with funding from the Federal Emergency Management Agency (FEMA). It provides commentary on the NEHRP Guidelines for the Seismic Rehabilitation of Buildings. It contains systematic guidance enabling design professionals to formulate effective & reliable rehabilitation approaches that will limit the expected earthquake damage to a specified range for a specified level of ground shaking. This kind of guidance applicable to all types of existing buildings & in all parts of the country has never existed before. Illustrated.

Author: Ghassan Fawaz
Publisher:
ISBN:
Category :
Languages : en
Pages : 302

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Bond of reinforcement has a major influence on the behavior of reinforced concrete (RC) structures. Even though bond has been extensively studied over the past decades, there are still a number of knowledge gaps requiring investigation. This dissertation presents three studies related to the basic bond behavior of reinforcement and the influence of bond-slip on the seismic response of RC columns. The first investigation characterizes the bond behavior of iron-based shape-memory alloy (Fe-SMA) bars. Fe-SMA reinforcement provides new opportunities for design and strengthening of concrete structures thanks to their shape memory effect. However, there is currently little data on its bond performance. Experiments were conducted to study the bond-slip behavior of ribbed Fe-SMA bars embedded in concrete specimens with different levels of passive confinement. Fe-SMA bars presented a similar bond performance as conventional reinforcement, but their bond strength was reduced with heat activation in low-confined specimens. An analytical model is also proposed to calculate the transfer length of Fe-SMA bars in prestressing applications. The second investigation proposes nonlinear finite element models to accurately simulate the cyclic response of RC columns, including the effect of bond-slip. Concrete is modeled using a triaxial constitutive model recently proposed in the literature. A commonly used uniaxial steel model is modified to account for low-cycle fatigue rupture using a phenomenological criterion. The bond-slip behavior of bars is modeled using a zero-thickness interface element and a bond stress-slip law that predicts bond deterioration caused by generalized slip demands, tensile yielding of steel, and concrete damage. The proposed models accurately predict the cyclic response and failure of previously tested column components. The third investigation focuses on the effects of strain penetration and bond modification on the lateral response of RC columns. Two large-scale column specimens were tested under cyclic loading. One specimen had conventional reinforcement details, while the other had headed bars that were partially debonded along the footing to alleviate strain concentrations. Both specimens formed plastic hinges and failed due to rupture of longitudinal bars. The specimen with partial debonding presented less damage and a larger deformation capacity. Experimental data indicated that the debonding strategy reduced peak tensile strains, and increased bar slip and fixed-end rotations. However, it also reduced the lateral load resistance of the column. Companion finite element analyses have indicated that the reduction in peak lateral strength is caused by lower steel stress demands when concrete cover fails

Author: Jie Lu
Publisher:
ISBN:
Category : Buildings, Reinforced concrete
Languages : en
Pages : 184

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Author: Jaber Alsiwat
Publisher:
ISBN:
Category : Buildings
Languages : en
Pages : 0

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Reinforced Concrete structures located in regions of high seismic activity are expected to develop inelastic deformations in their critical regions. Therefore, inelastic dynamic analysis is required to obtain reliable predictions of structural behavior during an earthquake. Tests on reinforced concrete elements and subassemblages have shown that anchorage slip and inelastic shear deformations can be as significant as those due to inelastic flexure, in the critical regions. Hence, a proper seismic analysis should include inelastic deformations due to anchorage slip, shear and flexure. Flexural response has been researched extensively in the past. Research on the effects of anchorage slip and shear inelasticity is scarce in the literature.

Author: Jessica Harvat
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Book Description
The effect of corrosion on a single-bent, reinforced concrete (RC) bridge subject to seismic loading is the primary focus of this research. This work attempts to determine the effects of decreasing rebar diameter and concrete cover spalling on the strength and stiffness of the RC bridge. The application of these results to the field of historic preservation will also be explored. Through the use of static and dynamic analyses, this research shows that the effects of corrosion only have a slight influence on the seismic fragility of the RC bridge. The loss of three inches of concrete cover from the bridge column is shown to have a greater effect on the strength and stiffness of the bridge than decreasing the rebar diameter by 10%. The deformation capacity and demand both increase for bridges with reduced reinforcing steel and concrete cover; however, the capacity increases to a greater degree than the demand. The seismic fragility of the bridge based on deformation criteria is greatest for the pristine structure, and it decreases as the level of damage increases. Future work should include verifying the hysteretic behavior by accounting for reinforcement slip caused by a loss of bond.

Author: Glenn M. Marquis
Publisher: National Library of Canada = Bibliothèque nationale du Canada
ISBN:
Category : Earthquake resistant design
Languages : en
Pages : 234

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Book Description
"The influence of high-strength concrete on the seismic response of reinforced concrete exterior beam-column-slab subassemblages was investigated by the testing of two full-scale specimens. The specimens, one constructed with normal-strength concrete and the other constructed with high-strength concrete, were designed as ductile moment-resisting frames such that the flexural strengths of the beams were similar. The increase in concrete strength allowed for some reduction of member sizes." --