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Steel Construction Published the List of Highly Influential Articles of 2020
2020 Vol. 35, No. 3
Display Method:
2020, 35(3): 1-25.
doi: 10.13206/j.gjgSE20010805
Abstract
PDF (9796KB)
Abstract:
With the increase of yield strength, the yield ratio of high strength structural steel increases, and the elongation after fracture decreases. The application of high strength structural steel in seismic areas is limited due to the lack of relevant codes. This paper reviewed research progress on seismic behavior of high strength steel structures in recent years at the level of material properties, members and structures, and the corresponding findings were summarized. Highlights include:the static tensile mechanical properties, cyclic constitutive models and ultra-low cycle fatigue properties of materials, the seismic behavior of columns, beams and connections, and the seismic behavior of high strength steel frame structures. Finally, the prospect of further research on seismic behavior of high strength steel structures was presented.
With the increase of yield strength, the yield ratio of high strength structural steel increases, and the elongation after fracture decreases. The application of high strength structural steel in seismic areas is limited due to the lack of relevant codes. This paper reviewed research progress on seismic behavior of high strength steel structures in recent years at the level of material properties, members and structures, and the corresponding findings were summarized. Highlights include:the static tensile mechanical properties, cyclic constitutive models and ultra-low cycle fatigue properties of materials, the seismic behavior of columns, beams and connections, and the seismic behavior of high strength steel frame structures. Finally, the prospect of further research on seismic behavior of high strength steel structures was presented.
2020, 35(3): 26-36.
doi: 10.13206/j.gjgSE19121501
Abstract:
A steel-concrete composite (SC) structure consists of two steel faceplates and a core concrete. It has a wide application in engineering practice such as nuclear facilities, high-rise buildings, and protective structures, etc. With the structures exposed to unexpected impact loadings during its service life, it demonstrates a great necessity to investigate the impact resistance of SC structures and components. Based on the review of the development and application of SC structures and the investigations on its impact resistance at home and abroad, the performance of SC structures under impact loadings and the calculation methods for local damage and global response are summarized. Some suggestions on the key problems in the research and practical application of the structures are discussed.
A steel-concrete composite (SC) structure consists of two steel faceplates and a core concrete. It has a wide application in engineering practice such as nuclear facilities, high-rise buildings, and protective structures, etc. With the structures exposed to unexpected impact loadings during its service life, it demonstrates a great necessity to investigate the impact resistance of SC structures and components. Based on the review of the development and application of SC structures and the investigations on its impact resistance at home and abroad, the performance of SC structures under impact loadings and the calculation methods for local damage and global response are summarized. Some suggestions on the key problems in the research and practical application of the structures are discussed.
2020, 35(3): 37-64.
doi: 10.13206/j.gjgS19112603
Abstract:
Theoretical analysis and design method of buckling of centrally loaded members by torsion and flexure are introduced. Torsion and flexure buckling may occur for sections with one symmetrical axis or without any symmetrical axis. Torsion buckling may appear for sections with two symmetrical axes. For both situations, critical loads will be lower than Euler's critical load. According to elastic buckling theory, the design formula of torsion buckling as well as torsion and flexure buckling are provided in Standard for Design of Steel Structures (GB 50017-2017).
Theoretical analysis and design method of buckling of centrally loaded members by torsion and flexure are introduced. Torsion and flexure buckling may occur for sections with one symmetrical axis or without any symmetrical axis. Torsion buckling may appear for sections with two symmetrical axes. For both situations, critical loads will be lower than Euler's critical load. According to elastic buckling theory, the design formula of torsion buckling as well as torsion and flexure buckling are provided in Standard for Design of Steel Structures (GB 50017-2017).
2020, 35(3): 65-73.
doi: 10.13206/j.gjgSE20020401
Abstract:
There are some aspects that need to be improved in design of crane runway girders in GB 50017-2017, for example, 1) the bearing stress at the web edge is 15% and 24% smaller than FEM results; 2) the strength reduction factor accounting for the lateral-torsional buckling is 10%~25% greater than available test results in the international literature. This paper reveals another problem that exists in current design method of crane runway girders:the strength reduction factor is based on an about 15% larger and unreachable bending moment. This paper proposed a new strength reduction factor for mono-symmetrical beams, which is based on the bending moment for which the tensile region has a certain depth of plastic strain and the compressed edge is just yielding, this bending moment is smaller than the commonly used elastic limiting moment based on the sectional modulus of the compressed edge, so as to make the calculation result more reasonable.
There are some aspects that need to be improved in design of crane runway girders in GB 50017-2017, for example, 1) the bearing stress at the web edge is 15% and 24% smaller than FEM results; 2) the strength reduction factor accounting for the lateral-torsional buckling is 10%~25% greater than available test results in the international literature. This paper reveals another problem that exists in current design method of crane runway girders:the strength reduction factor is based on an about 15% larger and unreachable bending moment. This paper proposed a new strength reduction factor for mono-symmetrical beams, which is based on the bending moment for which the tensile region has a certain depth of plastic strain and the compressed edge is just yielding, this bending moment is smaller than the commonly used elastic limiting moment based on the sectional modulus of the compressed edge, so as to make the calculation result more reasonable.
