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RISS 인기검색어
- 검색키워드
- 저자 : Elie G. Hantouche (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Response of Double Angle and Shear Endplate Connections at Elevated Temperatures
Elie G. Hantouche,Sarah A. Sleiman 한국강구조학회 2016 International Journal of Steel Structures Vol.16 No.2
Double angle and shear endplate connections are considered simple-beam end framing connections designed to carry gravity loads only. However, during a fire event, additional thermal induced axial forces might develop in the beam and cause failure of the connection. This paper presents the results of finite element (FE) simulations on double angle and shear endplate connections assemblies in fire. FE simulations are validated against experimental results of double angle and shear endplate connections at elevated temperature. A detailed comparison of the variation of the axial force during the heating and cooling phases of a fire is made between the two connections covering the following parameters: load ratio, beam length, and double angle and shear endplate thickness and location. The results can help future design guidelines to account for the thermal induced forces and deformations in double angle and shear endplate connections during a fire.
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Elie G. Hantouche,Elie N. Mouannes 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.22 No.2
The results of a series of finite element (FE) simulations and experimental studies are used to develop strength and stiffness models that predict the failure capacity and response characteristics of unstiffened extended endplate connections with circular and rectangular bolt configurations associated with deep girders. The proposed stiffness models are composed of multi-linear springs which model the overall extended endplate/column flange system deformation and strength of key-components. Comparison of model predictions with FE and experimental results available in the literature show that the proposed models accurately predict the strength and the response of extended endplate/column system with circular and rectangular bolt configurations. The effect of the bolt configuration (circular and rectangular) on the prying phenomenon encountered in the unstiffened extended endplate/column system was investigated. Based on FE results, extended endplate with circular bolt configuration has a more ductile behavior and exhibits higher total prying forces. The proposed models can be used to design connections that cover all possible failure modes for extended endplate with circular bolt configuration. This study provides guidelines for engineers to account for the additional forces induced in the tension bolts and for the maximum rotational capacity demand in the connection which are required for seismic analysis and design.
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Mazen B. Helwe,Elie G. Hantouche 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.4
This study investigates the alternate block shear (ABS) failure in bolted fl ange plate (BFP) and double Tee moment connections. ABS, not yet included in the AISC 358 specifi cations, is a failure mode that combines full tensile fracture in the beam fl ange with shear failure in the beam web. After validation with experimental results, fi nite element (FE) models are developed to examine ABS failure in BFP and double Tee moment connections. The dimensionless ratio of connection length to beam depth ratio is considered the major parameter for identifying the governing failure mode. Experimental results available in the literature and FE results conducted in this study are compared with existing strength models to investigate their prediction capabilities. A proposed methodology is presented through a stiff ness based model to predict the failure path and mode. Adding the ABS failure check to the current US building standards is recommended to ensure a safe design.
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Predicting the Demand of Shear Tab Connections with Composite Beams in Fire
Mohammad A. Hajjar,Elie G. Hantouche 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.3
Shear tab connections are one of the most commonly used simple beam-end framing connections. Simple connections are designed to resist shear forces at ambient temperature. This study aims at identifying the key parameters that aff ect the behavior of composite beams with shear tab connections under fi re. Large axial forces are generated during a fi re event due to the thermal expansion of the materials. These forces, which are not considered in the design, could lead to connection failure. In this study, fi nite element (FE) models are developed in Abaqus and validated against experimental data available in the literature. The strength degradation of the steel material at elevated temperatures is accounted for using retention factors. Concrete damage plasticity is implemented to model the concrete behavior at high temperatures. FE simulations are then performed to investigate the eff ect of diff erent parameters on the behavior of shear tab connections in composite beams subjected to fi re. The main parameters are: load ratio, concrete slab temperature, shear tab thickness, setback distance, bolt diameter, in addition to the creep in the concrete and the partial composite action. This proposed research provides more guidance on the eff ect of thermally induced forces and deformations of shear tab connections with composite beams. It also provides the basis for developing simple methods of analysis.
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