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RISS 인기검색어
- 검색키워드
- 저자 : Mohamed H. Mussa (검색결과 2 건)
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Mohamed H. Mussa,Azrul A. Mutalib 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.3
CIDECT guideline of carbon steel is frequently applied to design the cold-formed stainless steel tubular X-joints. The allowable range of the brace to chord width ratio (β) had been recorded in this guideline without mention to specifi c limits for the brace to chord thickness ratio (τ). Therefore, this study was carried out to investigate the eff ect of β and τ ratios on the behaviour of tubular X-joints by using LUSAS software. Three numerical models were created based on the stainless steel sheet type which symbolled as XD (duplex EN1.4462), XH (high strength austenitic), and XN (normal AISI 304). A good consistency was achieved with the experimental test in terms of load–defl ection behaviour, ultimate joint strength, and failure modes within a maximum error of 8.63%. Parametric studies results indicated that the increased of (β) ratio at constant (τ = 1) capable to increase the joint strength which was quite conservative with the CIDECT design strengths of specimens failed with the chord side wall failure, while it was unconservative to chord face failure. Hence, equations were proposed to calculate the joint strength for specimens failed by chord face failure. A range of (0.4–2) had proposed for (τ) ratio. The ultimate joint strength obviously increased at high values of (τ) ratio within a constant value of (β = 1). Moreover, the chord side wall and brace local buckling failure modes observed when (τ > 0.5) and (τ ≤ 0.5), respectively, which indicated that the brace local buckling failure can be only occurred when (β > 0.85) and (τ ≤ 0.5).
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Numerical formulation of P-I diagrams for blast damage prediction and safety assessment of RC panels
Mohamed H. Mussa,Azrul A. Mutalib,Hong Hao 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.75 No.5
A numerical study is carried out to assess the dynamic response and damage level of one- and two-way reinforced concrete (RC) panels subjected to explosive loads by using finite element LS-DYNA software. The precision of the numerical models is validated with the previous experimental test. The calibrated models are used to conduct a series of parametric studies to evaluate the effects of panel wall dimensions, concrete strength, and steel reinforcement ratio on the blast-resistant capacity of the panel under various magnitudes of blast load. The results are used to develop pressure-impulse (P-I) diagrams corresponding to the damage levels defined according to UFC-3-340-02 manual. Empirical equations are proposed to easily construct the P-I diagrams of RC panels that can be efficiently used to assess its safety level against blast loads.
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