Seismic Behavior of Dual Systems with Column Hinging

2001 ◽  
Vol 17 (4) ◽  
pp. 657-677 ◽  
Author(s):  
Mário S. Lopes ◽  
Rita Bento
Keyword(s):  
Ground Motions ◽  
Nonlinear Dynamic Analysis ◽  
Capacity Design ◽  
Dual Systems ◽  
Structural Walls ◽  
Design Procedures ◽  
Earthquake Ground Motions ◽  
Codes Of Practice ◽  
Moment Resisting ◽  
Ductile Behavior

In order that moment-resisting frames exhibit adequate ductile behavior under seismic actions, it is necessary that inelastic deformations spread throughout the height of the frames. It is widely accepted that this is only possible if vertical members remain essentially elastic, such as enforced in the most advanced codes of practice. The results of nonlinear dynamic analysis shown in this work demonstrate that this is not the case if frames resist earthquake ground motions together with structural walls. This was attributed to the fact that these elements prevent the development of sidesway mechanisms even if plastic hinges form at all column extremities at a given floor. As a consequence, it is proposed to relax the capacity design procedures for design of ductile frames that resist earthquake ground motions together with structural walls.

scholarly journals Bidirectional Response of Weak-Axis End-plate Moment Connections: Numerical Approach

Metals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 964
Author(s):  
Eduardo Nuñez ◽  
Guillermo Parraguez ◽  
Ricardo Herrera
Keyword(s):  
Brittle Failure ◽  
Numerical Models ◽  
Failure Mechanisms ◽  
Numerical Approach ◽  
Axial Loads ◽  
Moment Connections ◽  
Design Procedures ◽  
Moment Resisting ◽  
Ductile Behavior ◽  
Partially Restrained

Brittle failure mechanisms can affect the seismic performance of structures composed of intersecting moment resisting frames, if the biaxial effects are not considered. In this research, the bidirectional cyclic response of H-columns with weak-axis moment connections was studied using numerical models. Several configurations of joints with bidirectional effects and variable axial loads were studied using the finite element method (FEM) in ANSYS v17.2 software. The results obtained showed a ductile behavior when cyclic loads are applied. No evidence of brittle failure mechanisms in the studied joint configurations was observed, in line with the design philosophy established in current seismic provisions. However, beams connected to the column minor axis reached a partially restrained behavior. Joints with four beams connected to the column exhibited a partially restrained behavior for all axial load levels. An equivalent force displacement method was used to compare the hysteretic response of 2D and 3D joints, obtaining higher deformations in 3D joints with respect to 2D joints with a similar number of connected beams. Consequently, design procedures are not capable of capturing the 3D deformation phenomenon.

scholarly journals The capacity design of reinforced concrete hybrid structures for multistorey buildings

1986 ◽  
Vol 19 (1) ◽  
pp. 1-17 ◽  
Author(s):  
T. Paulay ◽  
W. J. Goodsir
Keyword(s):  
Reinforced Concrete ◽  
Design Procedure ◽  
Structural Response ◽  
Hybrid Structures ◽  
Design Parameters ◽  
Capacity Design ◽  
Structural Walls ◽  
Design Procedures ◽  
Fixed Base ◽  
Selection Of

To complement existing capacity design procedures used in New Zealand for reinforced concrete buildings in which earthquake resistance is provided by ductile frames or ductile structural walls, an analogous methodology is presented for the design
of ductile hybrid structures. Modelling and types of structures in which the mode of wall contribution is different are briefly described. A step by step description of a capacity design procedure for a structural system in which fixed base ductile frames and walls, both of identical height, interact, is presented. The rationale for each step is outlined and, where necessary, evidence is offered for the selection of particular design parameters and their magnitudes. A number of issues which require further study are briefly outlined. These relate to irregularity in layout, torsional effects, diaphragm flexibility, shortcomings in the predictions for dynamic shear demands in walls, and to limitations of the proposed design procedure. It is believed that the methodology is logical, relatively simple and that it should ensure, when combined with appropriate detailing, excellent seismic structural response.

scholarly journals Minimizing the torsional response of inelastic multistory buildings with simple eccentricity

2015 ◽  
Vol 42 (11) ◽  
pp. 966-969 ◽  
Author(s):  
George K. Georgoussis
Keyword(s):  
Ground Motions ◽  
Kern County ◽  
Structural Elements ◽  
Structural Walls ◽  
Multistory Buildings ◽  
Torsional Response ◽  
Optimum Arrangement ◽  
Moment Resisting ◽  
Close Distance ◽  
Strong Ground

Common types of multistory buildings, detailed according to a planar static analysis under a code lateral loading, may have a practically translational behavior when the mass axis is passing through (or within a close distance from) the modal centre of rigidity (m-CR). The concept of this point in elastic multistory structures was introduced by the author in earlier papers, but it retains its value in structures composed by inelastic bents, since it specifies the optimum arrangement of these structural elements in terms of producing minimum torsional response in the case of a strong ground motion. This is demonstrated in typical five story buildings, composed by moment resisting frames and structural walls, under the ground motions of Kern County and Loma Prieta.

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