Search results

Since the behaviour following sudden column loss is likely to be inelastic and possibly implicate catenary effects, both geometric and material nonlinearities are considered.
This paper aims to evaluate the effects of seismic design and structural integrity requirement on the progressive collapse resistance of steel frame structures.
In order to investigate the load redistribution behaviour of the structure upon the sudden removal of a column, three different analysis procedures, that is linear static, nonlinear static and nonlinear dynamic, were applied.
The steel frames were designed considering the location in a seismic region with soil class C, damping ratio 5%, Peak Ground Acceleration (PGA) of 0.25g and behaviour factor q=6.5.
The location of the removed column has a very strong impact on the behaviour of the structure.

The study was based on an experimental program carried out at the JRC ELSA Laboratory with the aim of assessing the seismic behaviour of flat-slab structures.
The behaviour of such a structural system under seismic actions shows important drawbacks, such as high lateral flexibility and low energy dissipation capacity.
Experimental tests showed that the structure had low lateral stiffness and low energy dissipation capacities, which are commonly associated with poor seismic behaviour during strong earthquakes.
In case of severe seismic actions the structure should be combined with other structural elements for providing much greater lateral stiffness, like structural walls, braces, or stiff frames.
Method of analysis for cyclically loaded R.C. plane frames including changes in geometry and non-elastic behavior of elements under combined normal force and bending.

This paper presents the results of the past and ongoing research to enhance the SHJ seismic behaviour.
The SHJ Seismic Behaviour The moment-relative rotation behaviour of the SHJ is dependent on and schematically similar to the AFC force-displacement behaviour.
This will provide the SHJ with much more consistent and predictable seismic behaviour.
Clifton, Proposed development of a damage resisting eccentrically braced frame with rotational active links.
Clifton, Design considerations for braced frames with asymmetrical friction connections-AFC. 2012

The beam-to-column stiffness ratio ρ of a frame is given by the following equation
Modelling of inelastic dynamic behaviour of the frames.
The inelastic behavior of the CFT columns is modelled by the aid of the modified Al-Bermani model [25, 26].
Beskos, Seismic behavior of composite steel/concrete MRFs: deformation assessment and behavior factors, Bulletin of Earthquake Engineering. 13(12) (2015) 3871-3896
Beskos, Seismic damage estimation of in-plane regular steel moment resisting and x-braced frames, Bulletin of Earthquake Engineering. 10 (2012) 1745-1766

Comparing Steel Plate Shear Wall Behavior with Simple and Corrugated Plates M.
Fabrication of this system consists of filling the space between frame and beam and column.
Plate girders, braced frame systems and thin steel plate shear walls are examples of civil engineering elements that notably use thicker plates in comparison with aeronautical engineering elements.
In civil engineering, welding infill steel plates to the beams and columns of a frame in building has potential to modify structural behavior, converting a moment frame system into a steel plate shear wall (SPSW).
Its behavior is analogous to a vertical plate girder whose plates, columns and beams are the same as its webs, flanges and stiffeners, respectively but the main difference between SPSW and plate girder is the significant effect of beams and especially stiffness of columns.

In recent years, the fiber beam element model is used more and more to simulate the beams, columns and braces of building structures[1-5].
In view of computational accuracy, a reasonable hysteretic constitutive model of concrete should be able to describe the nonlinear mechanical behavior of concrete which is as follow: 1) compression strengthening, softening effect and tension stiffening effect; 2) stirrup confinement effect; 3) stiffness degradation effect under cyclic loading; 4) cracks under cyclic loading, crack closure and stiffness recovery effects.
A fiber beam-column element for seismic response analysis of reinforced concrete structures [R].
Fiber beam-column model for non linear analysis of R/C frames: part I.
Fiber beam column model for non linear analysis of R/C frames: part II.

For the lack of research in the longitudinal frame of prefabricated structure for its weak lateral stiffness, pushover analysis is conducted to evaluate the seismic performance of a fabricated concrete frame.
Conventionally, braces and other energy dissipative devices can be applied to improve the seismic performance [2,3,4].
Beam end moments, inter-story drifts and the plastic behavior are also compared by time history analysis method, which is observed of great significance in strengthening the longitudinal frame of prefabricated structure.
A 6-storey prefabricated RC frame is located at site of category Ⅳ , defined as seismic group 1.The seismic zone of intensity for design is Ⅶ（0.1g）.
And the dampers damping effect are remarkable for the largest inter-story drift is 0.0058.

Behaviour factor (q) evaluation the CFS braced structures according to FEMA P695.
Experimental investigation of seismic behaviour of low dissipative CFS strap-braced stud walls.
Seismic response of Cfs strap-braced stud walls: Theoretical study.
Seismic response of Cfs strap-braced stud walls: Experimental investigation.
Strap-braced CFS walls: experimental characterization of the seismic response.

Steel Bracing.
In this method, lateral load carries by steel braces and it increases stiffness of structure, decreases period of structure and damages in column member.
Bedirhanoğlu, The Behavior of Reinforced Concrete Members with Low Strength Concrete Under Earthquake Loads: An Investigation and Improvement.
Kumbasar, Seismic Behavior of Joints Built with Plain Bars and Low Strength Concrete.
Reddya, A New Model To Simulate Joint Shear Behavior Of Poorly Detailed Beam–Column Connections In RC Structures Under Seismic Loads, Part I: Exterior Joints.

Bypour et al. [17] investigated the effect of connection types on behavior of SPSW in RC frame.
Analytical study of building height effects over Steel Plate Shear Wall Behavior.
Seismic retrofit design method for RC buildings using buckling-restrained braces and steel frames.
Experimental study on seismic behavior of RC frames strengthened with CFRP sheets.
Kioumarsi, Nonlinear analysis to investigate effect of connection type on behavior of steel plate shear wall in RC frame, Eng Struct, 179, 611-624 (2019)