Which characteristic of structure is improved when eccentric braced frames are used?

Which characteristic of structure is improved when eccentric braced frames are used?

Eccentric bracing When properly proportioned, eccentric braced frames may exhibit a more ductile characteristic and greater energy dissipation capabilities than a concentric braced frame in the same material.

What is the response reduction factor for steel frame with concentric braces?

For example, from IS 1893:2002 (Part-1), R-factor for Steel concentric braced frame is 4, whereas from ASCE-7, it is 3.5 and from Iranian code (Standard 2800), it is 6 for the same steel concentric braced frame.

What are the advantages of a simple braced frame compared to a moment resisting frame?

It has less deformation capacity and more stiffness compared to moment resisting frames. Moment resisting frames have more deformation capacity and less stiffness compared to braced frames.

Why do we use response reduction factor?

Response Reduction (R) factor is one of the most important parameter as its primary purpose of response reduction factors in force-based design methods is to reduce the elastic response force by a level that is consistent with the implied ductility capacity of the structure under consideration.

What is an eccentrically braced frame?

Eccentrically braced frames (EBFs) are a relatively new lateral force resisting system developed to resist seismic events in a predictable manner. Properly designed and detailed EBFs behave in a ductile manner through shear or flexural yielding of a link element.

What is Response Reduction Factor?

The response reduction factor represents the ratio of the maximum lateral force, Ve, which would develop in a structure, responding entirely linear elastic under the specified ground motion, to the lateral force, Vd, which has been designed to withstand. Response reduction factor R is expressed by Equation 1.

What is a braced frame in construction?

A braced frame is a structural system designed to resist wind and earthquake forces. Members in a braced frame are not allowed to sway laterally (which can be done using shear wall or a diagonal steel sections, similar to a truss).

What is the meaning of Response Reduction Factor?

What is the significance of response reduction factor in the estimation of seismic forces?

Response reduction factor is the factor by which the actual base shear force should be reduced, to obtain the design lateral force during design basic earthquake (DBE) shaking. The response reduction factor (R) is basically depends on Over strength (Rs), Ductility (Rµ), Redundancy (RR).

What is brace frame construction?

What is steel eccentrically braced frames?

What is eccentric bracing?

Eccentric bracing is a unique structural system that attempts to combine the strength and stiffness of a braced frame with the inelastic energy dissipation characteristics of a moment frame. The system is called eccentric because deliberate eccentricities are designed within the system, typically within the beam segment.

What is a concentrically braced frame?

Concentrically Braced Frames (CBFs) are a class of structures resisting lateral loads through a vertical concentric truss system, the axes of the members aligning concentrically at the joints. CBFs tend to be efficient in resisting lateral forces because they can provide high strength and stiffness.

What are the effects of lateral stiffness on a braced frame?

In a braced frame, where the beam to column connections are nominally pinned and thus do not contribute to lateral stiffness, the only effects to be amplified are the axial forces in the bracing members and the forces in columns that are due to their function as part of the bracing system

What is bracing in engineering?

Another fundamental concept in engineering – bracing – involves added additional elements to a frame in order to increase its ability to withstand lateral loads . There are two main varieties of braced frames – concentric and eccentric. Concentric bracing consists of diagonal braces located in the plane of the frame.