The Experts below are selected from a list of 30 Experts worldwide ranked by ideXlab platform
W J Lewis - One of the best experts on this subject based on the ideXlab platform.
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the efficiency of numerical methods for the analysis of prestressed nets and pin Jointed Frame structures
Computers & Structures, 2014Co-Authors: W J LewisAbstract:The non-linear static response of pretensioned cable net and pin-Jointed Frame structures is analysed using the minimum potential energy principle. The relative efficiencies of the stiffness matrix and dynamic relaxation methods in solving specific structural examples are examined. The performance of the dynamic relaxation algorithm with kinetic and viscous damping is discussed.
Makoto Ohsaki - One of the best experts on this subject based on the ideXlab platform.
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linear programming approach to design of link mechanisms of partially rigid Frames
2013Co-Authors: Makoto Ohsaki, Yoshihiro Kanno, Seita TsudaAbstract:Various approaches have been developed for design and optimization of link mechanisms. Conventionally link mechanisms are designed using unstable units such as mechanical chains. Recently, some optimization and enumeration approaches have been developed utilizing graph theory, mixed integer programming, and nonlinear programming. However, it is still difficult to obtain an unstable mechanism that has one degree of kinematical indeterminacy and undergoes the desired mode of deformation. Furthermore, most of the recently developed methods can be applied to planar mechanism, or a spatial truss mechanism with universally rotatable joints. The authors have developed a method for finding a retractable structure that deforms from a planar structure to a desired three-dimensional shape [1,2]. The structure consists of beams connected by partially rigid three-dimensional joints; i.e., rotations in specific directions and/or torsion are partially released from a rigidly-Jointed Frame. In this study, we present a general approach to design of spatial link mechanism with partially rigid joints. An infinitesimal mechanism that undergoes the desired deformation is obtained by solving a linear programming problem to maximize the load factor under constraints on equilibrium and upperand lower-bound constraints on the member-end forces. Large-deformation analysis is then carried out to verify the geometrically nonlinear behavior. It is shown in the numerical examples that various mechanisms can be easily found using the proposed method.
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simultaneous optimization of topology and geometry of a regular plane truss
Computers & Structures, 1998Co-Authors: Makoto OhsakiAbstract:Abstract An algorithm is presented for simultaneous optimization of geometry and topology of a regular plane truss with uniform cross-sectional area. Difficulties arising from singularity and discontinuity in eliminating unnecessary members and nodes from the ground structure are discussed in detail by using a cantilever-type plane truss. Note that the optimization problem becomes more complicated by limiting the feasible designs to regular trusses with uniform cross-sectional areas. In the proposed method, a pin-Jointed truss is first modeled as a rigidly Jointed Frame. A sigmoid function is used for modeling continuous transition between Frames with different topologies. In this manner, coalescent nodes and members are successfully removed from the initial ground structure. In the examples, optimal solutions are found for a rectangular plane truss which consists of rectangular units, and the effect of nodal cost on the optimal topology is discussed.
K P Jaya - One of the best experts on this subject based on the ideXlab platform.
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effect of slab shear reinforcement on the performance of the shear wall floor slab connection
Journal of Performance of Constructed Facilities, 2013Co-Authors: S Greeshma, K P JayaAbstract:AbstractThe floor slabs and shear walls together act as a rigid Jointed Frame in resisting gravity loads and lateral forces caused by wind and earthquake. The junction between the wall and slab is a key force-resisting element that is subjected to severe stress concentration. The performance of the connection can influence the pattern and distribution of lateral forces among the vertical elements of the structure. In the current study, two different reinforcement detailing adopted, such as (1) conventional joint with the provision of U hooks connecting shear wall and slab and (2) slab bars bent 90° at the core region along with the provision of shear reinforcement in the slab. Analytical investigations were carried out to study the performance of the shear wall–slab connection with these detailings. The RC model consists of a material model to predict the failure of brittle materials, applied to a three-dimensional solid element in which reinforcing bars may be included. Good energy dissipation capacities...
S Greeshma - One of the best experts on this subject based on the ideXlab platform.
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effect of slab shear reinforcement on the performance of the shear wall floor slab connection
Journal of Performance of Constructed Facilities, 2013Co-Authors: S Greeshma, K P JayaAbstract:AbstractThe floor slabs and shear walls together act as a rigid Jointed Frame in resisting gravity loads and lateral forces caused by wind and earthquake. The junction between the wall and slab is a key force-resisting element that is subjected to severe stress concentration. The performance of the connection can influence the pattern and distribution of lateral forces among the vertical elements of the structure. In the current study, two different reinforcement detailing adopted, such as (1) conventional joint with the provision of U hooks connecting shear wall and slab and (2) slab bars bent 90° at the core region along with the provision of shear reinforcement in the slab. Analytical investigations were carried out to study the performance of the shear wall–slab connection with these detailings. The RC model consists of a material model to predict the failure of brittle materials, applied to a three-dimensional solid element in which reinforcing bars may be included. Good energy dissipation capacities...
Wang Jing - One of the best experts on this subject based on the ideXlab platform.
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Structural Design for Rigid-Jointed Frame to Substitute the Frame Girder in Framework
Shandong Metallurgy, 2001Co-Authors: Wang JingAbstract:The Frame girder was substituted by rigid Jointed Frame on the top brick concrete building structure of bottom Framework.The rigid Jointed Frame was concealed in brick concrete wall.This structural design can not only enlarge the building space,but also meet the requirements of layers height and headroom.
