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

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.

Research on Seismic Behaviour Factor of CBSF

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.