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Secondary buckling analysis of spherical caps
Kato, Shiro,Chiba, Yoshinao,Mutoh, Itaru Techno-Press 1997 Structural Engineering and Mechanics, An Int'l Jou Vol.5 No.6
The aim of this paper is to investigate the secondary buckling behaviour and mode-coupling of spherical caps under uniformly external pressure. The analysis makes use of a rotational finite shell element on the basis of strain-displacement relations according to Koiter's shell theory (Small Finite Deflections). The post-buckling behaviours after a bifurcation point are analyzed precisely by considering multi-mode coupling between several higher order harmonic wave numbers: and on the way of post-buckling path the positive definiteness of incremental stiffness matrix of uncoupled modes is examined step by step. The secondary buckling point that has zero eigen-value of incremental stiffness matrix and the corresponding secondary mode are obtained, moreover, the secondary post-buckling path is traced.
Study on dynamic behavior of a new type of two-way single layer lattice dome with nodal eccentricity
Eka Satria,Shiro Kato,Shoji Nakazawa,Daisuke Kakuda 국제구조공학회 2008 Steel and Composite Structures, An International J Vol.8 No.6
This paper discusses a feasibility of a new type of two-way system for single layer lattice domes with nodal eccentricity by investigating the dynamic behavior under earthquake motions. The proposed dome is composed of two main arches, intersecting each other with T-joint struts to provide space for tensioning membranes. The main purposes of this study are to calculate the nonlinear dynamic response under severe earthquake motions and to see the possibility of using this new type of two-way system for single layer lattice domes against earthquake motions. The results show that the main arches remain elastic except yielding of the joints of strut members that can be used to absorb some amount of strain energy at strong earthquake motion. Consequently, deformation of the main arches can be reduced and any heavy damages on the main arches can be minimized. A kind of damage-control characteristic appeared in this system may be utilized against severe earthquake motions, showing a possibility of designing a new type of single layer lattice dome.
Nonlinear behavior of R/C cooling tower shells
Hara, Takashi,Kato, Shiro,Ohya, Makoto Techno-Press 1997 Structural Engineering and Mechanics, An Int'l Jou Vol.5 No.5
In this paper the ultimate strength of the R/C cooling towers, which have initial imperfection and pre-cracked elements, is analyzed. The initial geometric imperfections arise from the unavoidable inaccuracies under the construction and the pre-cracks are assumed to be produced by the temperature stress gradients or cyclic loading under wind pressure and/or earthquake load. Both effects are strongly influenced on the strength of the R/C cooling tower shell structures. The reinforcing ratio is also the important factor to evaluate the ultimate strength of the R/C cooling tower shells. However we could not analyze these structures experimentally because of their large, analyses are the powerful schemes to evaluate the safety and reliability of these structures. The analyzed model is Port Gibson cooling tower shell. In the numerical analysis the geometric and material nonlinearities are taken into account.
Hiyama, Yujiro,Ishikawa, Koichiro,Kato, Shiro,Okubo, Shoji Techno-Press 2000 Structural Engineering and Mechanics, An Int'l Jou Vol.9 No.3
This study discusses on the experimental and analytical results of the global buckling tests, carried out on aluminum alloy double layer space grids composed of tubular members, ball joints and connecting bolts at the member ends, with the purpose of demonstrating the effectiveness of a simplified analysis method using an equivalent slenderness ratio for the members. Because very few experiments have been carried out on this type of aluminum space grids, the buckling behavior is investigated experimentally over the post buckling regions using several space grid specimen with various values for the member slenderness ratio. The observed behavior duping the experiments is compared with the analytically obtained results. The comparison is made based on two different schemes; one on the plastic hinge method considering a bending moment-axial force interaction for members and the other on a method using an equivalent slenderness ratio. It is confirmed that the equivalent slenderness method can be effectively applied, even in the post buckling regions, once the effects of the rotational rigidity at the ball joints are appropriately evaluated, because the rigidity controls the buckling behavior. The effectiveness of the equivalent slenderness method will be widely utilized for estimation of the ultimate strength, even in post buckling regions for large span aluminum space grids composed of an extreme large number of nodes and members.
2方向 直交 格子 單層 래티스 돔의 斷面算定法 및 좌굴거동에 관한 연구
김종민(KIm Jong-Min),加藤 史郞(Kato Shiro),Yamauchi Yoshiro,한상을(Han Sang-Eul),황보석(Hwangbo Seok) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.10
The present paper proposes a new proportioning method for member sections of rigidly jointed 2-way grid single layer reticulated domes. The effects of additional bending moment caused by compressive stress are noticeable to decide the sectional properties of the members. In this study, the second-order elastic analysis is used for an assumption on amplification of stresses. This method includes elasto-plastlc behaviors, instability of the members and the overall shell buckling. To confirm the validity of this method, firstly pm supported 2-way grid single layer reticulated domes subjected to uniform load are designed by this method and then it is discussed how the domes satisfy the required load conditions, and lastly it is verified by the inelastic buckling analysis .
a-Se 광도전막을 이용한 HARP 촬상관의 제작 및 특성
박욱동,김기완,( Wug Dong Park,Ki Wan Kim,Misao Kubota,Tsutomu Kato,Shiro Suzuki,Kenkichi Tanioka ) 한국센서학회 1998 센서학회지 Vol.7 No.1
A HARP (high-gain avalanche rushing amorphous photoconductor) image pickup tube using 4 um thick a-Se photoconductive film was fabricated and its characteristics were investigated. When the target voltage was increased more than 360 V, the signal current increases rapidly but the dark current of the tube was suppressed less than 3.2 nA up to the voltage of 490 V. And the quantum efficiency of the target was about 4.3 at the electric field of 1.1x10^6 V/cm and the wavelength of 490 nm. Also the amplitude response of the HARP tube was 7.5% at 800 TV lines, and the decay lag was 3.4%.