Modal Characteristics of Planar Multi-Story Frame Structures

2016 ◽  
Vol 32 (5) ◽  
pp. 501-514 ◽  
Author(s):  
H.-P. Lin ◽  
S.-C. Chang ◽  
C. Chu
Keyword(s):  
Finite Element ◽  
Linear System ◽  
Finite Element Methods ◽  
Analytical Methods ◽  
Theoretical Method ◽  
Frame Structure ◽  
Frame Structures ◽  
Modal Characteristics ◽  
Out Of Plane ◽  
The Matrix

AbstractIn linear system, in-plane motions are decoupled from out-of-plane motions for planar frame structures. A theoretical method is proposed that permits the efficient calculations of modal characteristics of planar multi-story frame structures. There are 3 × m beam components for a planar m-story frame structure. By analyzing the transverse and longitudinal motions of each component simultaneously and considering the compatibility requirements across each frame joint, the undetermined variables of the entire m-story frame structure system can be reduced to six, regardless of the number of stories, and that can be determined by the application of the boundary conditions. The main feature of this method is to decrease the dimensions of the matrix involved in the finite element methods and certain other analytical methods.

Effects of Out-of-Plane Displacements on Load Capacity of Gusset Plates in Buckling Restrained Braced Frames

2018 ◽  
Vol 763 ◽  
pp. 892-899 ◽  
Author(s):  
Saul Y. Vazquez-Colunga ◽  
Chin Long Lee ◽  
Gregory A. MacRae
Keyword(s):  
Finite Element ◽  
Finite Element Methods ◽  
Load Capacity ◽  
Numerical Results ◽  
Numerical Analyses ◽  
Braced Frames ◽  
Gusset Plates ◽  
Out Of Plane ◽  
Buckling Restrained Braced Frames ◽  
Monotonic Load

This study sets out to investigate the effect of out-of-plane (OOP) displacements on the monotonic load capacity of gusset plates (GPs) via numerical analyses using finite element methods. Two models were used: a) models with in-plane (INP) actions only; and b) models with both INP and OOP actions. The numerical results show that the load capacity of GPs is reduced with the presence of OOP displacements. For an OOP drift of 2.5%, the reduced capacity ranges from 95% to 80% with an average of 88% of the load capacity when only INP actions were applied.

Comparative Study on the Effects of Infill Walls on Reinforced Concrete Frame Structures

2015 ◽  
Vol 730 ◽  
pp. 81-84
Author(s):  
Huan Jin
Keyword(s):  
Finite Element ◽  
Failure Modes ◽  
Shear Failure ◽  
Frame Structure ◽  
Frame Structures ◽  
Reinforced Concrete Frame ◽  
Element Analysis ◽  
Infill Walls ◽  
Finite Element Program ◽  
Static Test

Based on the quasi-static test of single-layer, two-bay RC frame model, using DIANA finite element program, a finite element Macro-model of masonry-infilled frame structure was established, and nonlinear finite element analysis of frame structures filled with different masonry materials was conducted. As a result of the existence of infill walls, the failure modes of frame structure have been changed, and which is easy to cause shear failure at the top of frame columns. If masonry materials of infill walls are different, the effects of infill panels on frame structures will be different. Comparative analysis shows that the influence of clay bricks is the largest, followed by autoclaved bricks’ influence, while aerated concrete blocks’ influence is the smallest. Therefore, to avoid the associated failure mechanism caused by infill walls, lightweight masonry materials are suggested to be used in actual engineering.

Shape Identification for Controlling the Static Deformation of Frame Structures

2014 ◽  
Author(s):  
Koki Kameyama ◽  
Masatoshi Shimoda ◽  
Takashi Morimoto
Keyword(s):  
Optimization Method ◽  
Frame Structure ◽  
Static Deformation ◽  
Free Form ◽  
Frame Structures ◽  
Shape Identification ◽  
Shape Gradient ◽  
Deformation Control ◽  
Out Of Plane ◽  
Gradient Function

The deformation control is an important design problem in the stiffness design of structures and it also enables to give a function to the structures. This paper proposes a non-parametric, or a node-based shape optimization method based on the variational method for controlling the static deformation of spatial frame structures. As the objective functional, we introduce the sum of squared error norms to the desired displacements on specified members. Under the assumption that each member varies in the out-of-plane direction to the centroidal axis, the shape gradient function and the optimality conditions are theoretically derived. The shape gradient function is applied to a gradient method in a function space with a Laplacian smoother. With this method, an optimal free-form frame structure with smoothness can be identified for a desired static deformation. The validity and effectiveness were verified through design examples.

scholarly journals Experimental and Finite Element Research on the Failure Mechanism of C/C Composite Joint Structures under Out-of-Plane Loading

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2922
Author(s):  
Yanfeng Zhang ◽  
Zhengong Zhou ◽  
Zhiyong Tan
Keyword(s):  
Finite Element ◽  
Failure Modes ◽  
Displacement Curve ◽  
Finite Element Software ◽  
Pull Out ◽  
Composite Joint ◽  
Element Simulation ◽  
Out Of Plane ◽  
The Matrix ◽  
Failure Morphology

The loading and the failure mode of metal hexagon bolt joints and metal counter-sunk bolt joints of C/C composites were investigated. The joints were tested for out-of-plane loading at two temperatures (600 °C and 800 °C). The failure morphology of a lap plate was investigated, and the main failure modes were determined. The typical load–displacement curve was characterized and the test was simulated using ABAQUS non-linear finite element software. Furthermore, progressive damage was induced, and comparison of the finite element simulation with the experimental data revealed that the failures mainly occurred in the lower lap plate and were dominated by cracking and delamination of the matrix, accompanied by the pull-out of a small number of piercing fibers. Finally, the influences of the temperature, nut radius, and fixture geometry on the critical load were determined via simulation.

A Comparison between the Matrix Displacement Method and the Finite Element Method in Solving Frame Structure with SM Solver Software

2014 ◽  
Vol 580-583 ◽  
pp. 3042-3045
Author(s):  
Li Juan Cheng ◽  
Xin Chi Yan
Keyword(s):  
Finite Element Method ◽  
Exact Solution ◽  
Finite Element ◽  
Internal Force ◽  
Frame Structure ◽  
The Finite Element Method ◽  
Displacement Method ◽  
Rigid Frame ◽  
The Matrix ◽  
Element Method

Using matrix displacement method and the finite element method to calculate the internal force of the same frame, and then comparing the results. Meanwhile, due to the theory that SM Solver can calculate the exact solution of rigid frame structure forces, we use it to support our experiment. Finally, we succeed in calculating and proving that Matrix displacement method and the finite element method have the same result in solving the rigid frame structure forces.

scholarly journals Development and Mechanical Performance of a New Kind of Bridge Seismic Isolator for Low Seismic Regions

2013 ◽  
Vol 20 (4) ◽  
pp. 725-735 ◽  
Author(s):  
H. Zhang ◽  
J. Li ◽  
T. Peng
Keyword(s):  
Finite Element ◽  
Finite Element Methods ◽  
Seismic Isolation ◽  
Mechanical Performance ◽  
Shear Stiffness ◽  
Theoretical Method ◽  
Seismic Regions ◽  
Vertical Bearing ◽  
Elastomeric Isolator ◽  
Rubber Bearings

The concept of fibre-reinforced plate elastomeric isolator (FRPEI) is introduced firstly in this paper. Three FRPEI specimens have been constructed to evaluate the mechanical performance of the isolators by performing vertical and horizontal tests. The research focuses on the compression stiffness, the shear stiffness, the hysteretic characteristic and the vertical bearing capacity of the isolators. The experimental results show that the mechanical performance of FRPEIs can meet the requirements of bridge rubber bearings and the energy dissipation capacity is better than that of general laminated rubber bearings. Therefore, it is feasible to use FRPEIs in seismic isolation of short span bridges in low seismic regions. Theoretical and finite element methods have also been employed and the deformation assumptions applied in the theoretical method are also verified by FEM. By comparing the differences of the results of different methods, the effectivenesses of the theoretical and finite element methods are evaluated and some considerations on isolator design are proposed.

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