http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Vasant Matsagar (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
-
Free Vibration Analysis of Thin Circular Cylindrical Shell with Closure Using Finite Element Method
Aruna Rawat,Vasant A. Matsagar,A.K. Nagpal 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.1
Vibration analysis of a thin circular cylindrical shell with closure is conducted using fi nite element method (FEM). Theoretically, shell vibrates in diff erent axial modes, m ; circumferential modes, n ; and any of their combinations with corresponding modal frequencies. The present FEM results are verifi ed by the results reported in the literature using various shell theories. The eigenvalues of the shell are extracted using block Lanczos and subspace iteration methods, in order to investigate their computational effi cacy. Further, the eff ect of adding various types of closures at one end of the circular cylindrical shell such as fl at, cone, and dome, on the modal frequencies are investigated. The two aspect ratios (length to radius ratio) of shell with closure, broad, and slender are considered for this study. The eff ect of the ratio of the thickness of the closure to the thickness of shell wall on the frequency is also investigated. For the shell with the closure, the vibration modes can be cylinder, closure, or combined cylinder and closure. The modal frequency of the cylindrical shell is signifi cantly aff ected by the closure. The lowest frequency is observed in the fl at type of closure in both the broad and slender cylindrical shells in comparison to the non-closure, dome, and cone type of the closures.
-
Blast Fragility and Sensitivity Analyses of Steel Moment Frames with Plan Irregularities
Anil Kumar,Vasant Matsagar 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.5
Fragility functions are determined for braced steel moment frames (SMFs) with plans such as square-, T-, L-, U-, trapezoidal-, and semicircular-shaped, subjected to blast. The frames are designed for gravity and seismic loads, but not necessarily for the blast loads. The blast load is computed for a wide range of scenarios involving diff erent parameters, viz. charge weight, standoff distance, and blast location relative to plan of the structure followed by nonlinear dynamic analysis of the frames. The members failing in rotation lead to partial collapse due to plastic mechanism formation. The probabilities of partial collapse of the SMFs, with and without bracing system, due to the blast loading are computed to plot fragility curves. The charge weight and standoff distance are taken as Gaussian random input variables. The extent of propagation of the uncertainties in the input parameters onto the response quantities and fragility of the SMFs is assessed by computing Sobol sensitivity indices. The probabilistic analysis is conducted using Monte Carlo simulations. The frames have least failure probability for blasts occurring in front of their corners or convex face. Further, the unbraced frames are observed to have higher fragility as compared to counterpart braced frames for far-off detonations.
-
Bond Behavior in Flexural Members: Numerical Studies
Ankit Bhardwaj,Vasant Matsagar,A.K. Nagpal,Sandeep Chaudhary 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.1
Adhesive bonding has recently emerged as an alternative to shear stud connection in steel–concrete composite fl exural members. Research on adhesive-bonded steel–concrete composite fl exural members is in a preliminary stage, and the behavior of the bond layer in these structures is not well understood yet. A three-dimensional fi nite element model is developed and used to conduct the parametric investigations. The developed model is validated with experimental results available in the literature. The behavior of the bond layer is defi ned in terms of normal stress, normal strain, shear stress, and shear strain. Seven diff erent parameters are studied regarding their eff ect on the behavior of the bond layer. The parameters include load proportion factor, longitudinal distribution of load, transverse distribution of load, width of concrete slab, depth of the concrete slab, Young’s modulus of the adhesive and transverse location of the adhesive fi ber. Parametric investigations are carried out to establish the relevance of parameters in terms of their eff ect on the behavior of the bond layer. The most signifi cant parameters are identifi ed as load proportion factor, longitudinal distribution of load, and Young’s modulus of adhesive.
-
Effect of location of load on shear lag behavior of bonded steel-concrete flexural members
Ankit Bhardwaj,Ashok K. Nagpal,Sandeep Chaudhary,Vasant Matsagar 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.41 No.1
Shear lag is one of the governing phenomena considered in the design of flanged flexural members. The effect of the location of load on shear lag is not well understood yet. This paper presents a study to understand the shear lag behavior in the concrete slab of bonded steel-concrete composite flexural members, conducted with the help of a developed three-dimensional finite element model. The effect of the location of load on shear lag behavior is studied with the help of twelve loading arrangements at the service and the ultimate loads. Three effective widths based on different design criteria are used to understand the effect of the location of load on effective width. These effective widths are effective width for deflection at the service load, effective width for maximum stress at the service load, and effective width for bending moment capacity at the ultimate load. The shear lag behavior is found to be significantly affected by the location of the load. Increase in scaled eccentricity causes shear lag to vary from positive to negative.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
