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RISS 인기검색어
- 검색키워드
- 저자 : Alaeddin Behravesh (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Shear Buckling Analysis of Steel Flat and Corrugated Web I-girders
Farhad Riahi,Alaeddin Behravesh,Mikaeil Yousefzadeh Fard,Arastoo Armaghani 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.12
One of the parameters of the economic design of steel I-girders is the use of thin webs. However, in large spans, the use of deep Igirders with thin web leads to the buckling of the web. In order to achieve out-of-plane stiffness and shear buckling resistance without the use of stiffeners or increasing the thickness of the webs, one possible way is to use corrugated plates in the I-girder web. To understand, shear stress distribution of the web a series of three-point load test was performed on four types of the web; (flat, trapezoidal-, sinusoidal-, and the zigzag-corrugated). A non-linear FE analysis method was used to obtain the shear stress distribution in a flat and corrugated web, since it was not possible to obtain the shear stress distribution from the experimental investigation. Based on this research, it was found that the main failure modes of the current models are yielding or shear buckling of the web when it is under the shear. In addition, it shows that the failure of all beams occurred due to shear buckling of the web without any interaction of the flange. In the other hand, the shear stress along the side of the flange is nearly zero; it is clear that the web takes almost all the shear force. The nonlinear analysis results show that shear stress is maximum and uniformly distributed on the web before the buckling. After buckling, the volume of shear stress is reduced and distributed unevenly.According to the results, there are three types of shear buckling: local, global, and interactive in models.
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Performance of Low-yield Strength Plates in Beam-column Connections against Progressive Collapse
Ahmad Karimian,Arastoo Armaghani,Alaeddin Behravesh 대한토목학회 2019 KSCE Journal of Civil Engineering Vol.23 No.1
In many studies about progressive collapse in steel moment frames, the effect of connections in all of structural frames has not been investigated. This is while the connections can have a significant impact on structure behavior against abnormal loads. This study highlights the effect of mechanical and geometric properties of beam-column connections in steel moment frames against progressive collapse. For this purpose, variable parameters include beam-column connection type (Welded Flange Plate connection or WFP and Welded Unreinforced Flange-Welded web connection or WUF-W), mechanical properties of beam-column connection (St37 building steel and low-yield strength plates) and the column removal location in different stories (without removing column and removing column on the ground, first and second floors). Three-storey steel frames which are designed to withstand earthquakes are examined. Finite element ABAQUS software is used for simulation. Moreover, the alternative load path method in which the structure response is examined against the column removal is used to evaluate steel frames response against progressive collapse. The results show that the use of low-yield strength steel plates depending on connection type can be efficient in improving the behavior of steel moment frames against progressive collapse.
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