Experimental testing of a self-centring concentrically braced steel frame

2021 ◽  
pp. 111521
Author(s):  
Gerard J. O'Reilly ◽  
Jamie Goggins
Keyword(s):  
Experimental Testing ◽  
Steel Frame ◽  
Concentrically Braced ◽  
Concentrically Braced Steel Frame

scholarly journals Optimization of concentrically braced steel frame structures based on SNI 1726:2019, SNI 1727:2020, SNI 1729:2020, and AISC 341-16

2021 ◽  
Vol 907 (1) ◽  
pp. 012010
Author(s):  
J Aloysius ◽  
J A Sumito ◽  
D Prayogo ◽  
H Santoso
Keyword(s):  
Steel Frame ◽  
Frame Structure ◽  
Frame Structures ◽  
Symbiotic Organisms Search ◽  
Safety Requirements ◽  
Concentrically Braced ◽  
Steel Frame Structures ◽  
Concentrically Braced Steel Frame ◽  
Symbiotic Organisms ◽  
Steel Frame Structure

Abstract Damages resulted from earthquakes are a loss in the economic sector. The structure of multi-story buildings needs an earthquake-proof design with higher performance to reduce such losses. By utilizing the metaheuristic algorithm, this study aims to identify the most compatible brace configuration and profile used in a concentrically braced steel frame structures with minimal total weight and that will meet the safety requirements. This algorithm is suitable owing to the fact that it is able to find solutions to any known optimization problem either through Particle Swarm Optimization (PSO), Symbiotic Organisms Search (SOS), or Differential Evolution (DE). The performance of these algorithms will demonstrated in a form of comparison through a case study of optimizing a 5-span, 6-story steel frame structure. These systems will determine the lightest frame weight, which also correlates to a lower construction cost, without compromising the constraints of SNI 1726:2019, SNI 1727:2020, SNI 1729:2020, and AISC 341-16. Based on the results of data processing, SOS is shown to achieve the highest algorithm performance compared to PSO and DE.

An innovative detail for precast concrete beam–column moment connections

1991 ◽  
Vol 18 (4) ◽  
pp. 690-710
Author(s):  
Hany Ahmed El-Ghazaly ◽  
Heyad Saud Al-Zamel
Keyword(s):  
Concrete Beam ◽  
Experimental Testing ◽  
Precast Concrete ◽  
Steel Frame ◽  
Reinforcing Bars ◽  
Shear Tests ◽  
Moment Connections ◽  
Modes Of Failure ◽  
Moment Resisting ◽  
Flexural Tests

A new detail is introduced for precast concrete beam-to-column moment connections. The detail consists of a connecting steel frame used to mechanically connect the threaded end protruding reinforcing bars from beam and column. The connection detail is made convenient to assemble where the erection method resembles that of steel construction. No idle crane time is necessary, since the connecting steel frame is designed to carry the beam's own weight. When the connection construction is completed, the joint functions as a moment resisting hard connection. The experimental testing program involved testing of twelve full-scale specimens in addition to a pilot test. Of the twelve tests seven are flexural tests, three are shear tests, and two are monolithic flexural tests for comparison. Modes of failure in the flexural tests were mainly due to rupture of tension reinforcement; however, premature slippage of the rebars may occur under certain conditions, but could be conveniently prevented. In the shear tests, diagonal tension crack failure predominated. If the connection parameters are properly selected, the connection will be capable of developing the beam's full plastic moment and undergo sufficient rotation before collapse. Key words: precast concrete, moment connections, connecting steel frame, stiffness, strength, ductility.

Research on Seismic Behaviour Factor of CBSF

2012 ◽  
Vol 166-169 ◽  
pp. 2326-2331
Author(s):  
Cheng Li ◽  
Jun Fen Yang ◽  
Qiang Gu
Keyword(s):  
Limit State ◽  
Element Model ◽  
Research Field ◽  
State Failure ◽  
Computation Method ◽  
Analysis Method ◽  
Seismic Behaviour ◽  
Behaviour Factor ◽  
Concentrically Braced ◽  
Concentrically Braced Steel Frame

In this paper,the definition and computation method of seismic behaviour factor is firstly explained,and then a V concentrically braced steel frame (CBSF) and an inverted-V CBSF were designed according to Chinese design codes,after that, the incremental dynamic analysis (IDA) was used to get the seismic behaviour factor.The results indicated that whether the connections between braces and columns or beams are rigid or hinged,which does not have much influence on the seismic behaviour factor of the structures.But the different seismic wave may bring different seismic behaviour factor for the same stuctures.Furthermore,the analysis method,limit state,failure criterion and finite element model of structures have some influrnce on the seismic behaviour factor of structures,and much work was needed in this research field.

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