An efficient axial-flexure-shear fiber beam model for dynamic analyses of beam–column framed structural systems under impact loading

2022 ◽  
Vol 245 ◽  
pp. 110349
Author(s):  
W. Wang ◽  
F. Zhou ◽  
J. Zhong
Keyword(s):  
Impact Loading ◽  
Structural Systems ◽  
Beam Model ◽  
Dynamic Analyses

An evaluation ofP-Δ amplification factors in multistorey steel moment resisting frames

1999 ◽  
Vol 26 (5) ◽  
pp. 535-548 ◽  
Author(s):  
R Tremblay ◽  
B Côté ◽  
P Léger
Keyword(s):  
Amplification Factor ◽  
Ground Motions ◽  
Beam Model ◽  
Steel Moment Resisting Frames ◽  
Moment Resisting Frame ◽  
Dynamic Analyses ◽  
Moment Resisting ◽  
Shear Beam ◽  
Nonlinear Dynamic Analyses ◽  
Shear Beam Model

Three different amplification factors that have been proposed to account for P-Δ effects in the seismic design of multistorey building structures are described and compared. Nonlinear dynamic analyses of a typical 20-storey steel moment resisting frame are carried out under earthquake ground motions typical of eastern and western Canada to evaluate the gravity load effects and to assess the effectiveness of each type of amplification factor in accounting for these effects. All three approaches maintain the ductility demand within the level computed without P-Δ effects, but lateral deformations are generally larger than those obtained neglecting the gravity loads. Nonlinear dynamic analyses are also performed on a shear-beam (stick) model of the same building to examine the possibility of using such simple models for studying the dynamic stability of buildings subjected to ground motions. The shear-beam model does not predict adequately the seismic behaviour of steel moment resisting frames for which P-Δ effects are significant.Key words: ductility, earthquake, ground motion, lateral deformation, moment resisting frame, P-Δ effects, push-over analysis, seismic, shear-beam model, stability coefficient, amplification factor.

Quasi-static data recovery for dynamic analyses of structural systems

2001 ◽  
Vol 37 (11) ◽  
pp. 825-841 ◽  
Author(s):  
Jianmin Gu ◽  
Zheng-Dong Ma ◽  
Gregory M. Hulbert
Keyword(s):  
Data Recovery ◽  
Structural Systems ◽  
Static Data ◽  
Dynamic Analyses

Dynamic Analysis of FRP-Reinforced Masonry Arches via a No-Tension Model with Damage

2014 ◽  
Vol 624 ◽  
pp. 619-626 ◽  
Author(s):  
Massimiliano Lucchesi ◽  
Barbara Pintucchi ◽  
Nicola Zani
Keyword(s):  
Dynamic Analysis ◽  
Beam Model ◽  
Normal Stresses ◽  
Masonry Arches ◽  
Irreversible Damage ◽  
Static And Dynamic Analysis ◽  
Reinforced Masonry ◽  
Composite Interface ◽  
Dynamic Analyses

A FE beam model to perform static and dynamic analysis of fiber-reinforced masonry arches is presented. Based on a constitutive equation formulated for no-tension masonry beams, the model accounts for a limit to the material deformability and provides for irreversible damage occurring under compression. In order to capture any possible FRP debonding, a procedure is also formulated to reduce the performance of the fiber when the tangential and normal stresses at the masonry-composite interface reach a critical value. Some dynamic analyses are performed on a case study with the aim of evaluating the effectiveness of FRP-retrofitting in improving seismic performances.

An Efficient Method to Predict the Effect of Design Modifications

1987 ◽  
Vol 109 (3) ◽  
pp. 377-384 ◽  
Author(s):  
Matt N. Rizai ◽  
James E. Bernard
Keyword(s):  
Efficient Method ◽  
Degrees Of Freedom ◽  
Structural Systems ◽  
Computationally Efficient ◽  
Stiffness Matrices ◽  
Eigen Value ◽  
Dynamic Analyses ◽  
Eigenvector Derivatives ◽  
Optimization Schemes ◽  
Derivatives Of

Static and dynamic analyses are important tools for the improvement of structural systems. Consider a system where a number of different changes may be synthesized to improve static and dynamic behavior. The analysis depends on numerical optimization schemes for systems with a large number of degrees of freedom. These analyses become computationally burdensome for redesign analysis. This paper presents an efficient method to predict the effect of design modifications on mechanical and structural systems with many degrees of freedom. The method minimizes a cost function which includes natural frequencies, size of design change and static deflections. It uses a finite-element preprocessor to find derivatives of mass and stiffness matrices and computationally efficient techniques to find eigen-value and eigenvector derivatives for use in the optimization.

scholarly journals CS-ASA: a new computational tool for advanced analysis of steel frames

2013 ◽  
Vol 66 (3) ◽  
pp. 281-288 ◽  
Author(s):  
Andréa Regina Dias da Silva ◽  
Ícaro Machado Prado ◽  
Ricardo Azoubel da Mota Silveira
Keyword(s):  
Mechanical Characteristics ◽  
Nonlinear Effects ◽  
Structural Systems ◽  
Analysis Program ◽  
The Finite Element Method ◽  
Computational Tool ◽  
Framed Structures ◽  
Static And Dynamic Stability ◽  
Dynamic Analyses ◽  
Advanced Analysis

A new computational tool for advanced static and dynamic analyses of steel framed structures based on the Finite Element Method has been developed and is presented herein. Two sources of nonlinearity can be considered in these analyses, i.e.: the geometric, which considers the nonlinear effects of structure displacements; and the physical, which considers the nonlinear effects of the mechanical characteristics of the material used in civil construction. Loading, geometric and residual stress imperfections can also be considered. To illustrate some of the features and capabilities that differentiate this tool from existing commercial programs, static and dynamic stability analyses of some structural systems with rigid and semi-rigid connections are evaluated. The results obtained by other researchers are used to validate the nonlinear formulations and numerical solution methodologies implemented in CS-ASA, and to attest the efficiency of the structural analysis program presented herein.

Inelastic Response of a Deep Crack Single-Edge Notch Specimen Under Impact Loading

1995 ◽  
Vol 117 (3) ◽  
pp. 205-211
Author(s):  
P. M. Vargas ◽  
R. H. Dodds
Keyword(s):  
Strain Rate ◽  
Impact Loading ◽  
Time Integration ◽  
Model Material ◽  
Integration Scheme ◽  
Pressure Vessel Steel ◽  
Single Edge ◽  
Strain Rate Effects ◽  
Vessel Steel ◽  
Dynamic Analyses

Three-dimensional dynamic analyses are performed for a single-edge bend, SE(B), fracture specimen (a/W = 0.5) subjected to impact loading. Loading rates obtained in routine drop tower tests (terminal load-line velocity of 100 in./s or 2.54 m/s) are applied in the analyses. Explicit time integration coupled with an efficient element integration scheme is used to compute the dynamic response of the specimen. Strainrate sensitivity is introduced via a new, efficient implementation of the Bodner-Partom viscoplastic constitutive model. Material properties for A533B steel (a medium strength pressure vessel steel) are used in the analyses. Static analyses of the same SE(B) specimens provide baseline results from which inertial effects are assessed. Similarly, dynamic analyses using a strain-rate insensitive material provide a reference for the assessment of strain rate effects. Strains at key locations and the support reactions are extracted from the analyses to assess the accuracy of static formulas commonly used to estimate applied J values. In ertial effects on the applied J are quantified by examining the acceleration component of J. Results show that dynamic effects for the steel analyzed are negligible after twice a characteristic time that can be defined in terms of the first elastic period of the specimen.

scholarly journals New Trends Towards Enhanced Structural Efficiency and Aesthetic Potential in Tall Buildings: The Case of Diagrids

2020 ◽  
Vol 10 (11) ◽  
pp. 3917 ◽  
Author(s):  
Domenico Scaramozzino ◽  
Giuseppe Lacidogna ◽  
Alberto Carpinteri
Keyword(s):  
Structural Response ◽  
Tall Buildings ◽  
Structural Systems ◽  
Preliminary Design ◽  
Shear Lag ◽  
Computational Tools ◽  
Remarkable Improvement ◽  
Geometrical Pattern ◽  
Dynamic Analyses ◽  
Architectural Effects

Due to the increasing number of people and activities within the cities, tall buildings are exploited worldwide to address the need for new living and commercial spaces, while limiting the amount of used land. In recent decades, the design of tall buildings has undergone a remarkable improvement, thanks to the development of new computational tools and technological solutions. This has led to the realization of innovative structural systems, like diagrids, which allow the achievement of high structural performances and remarkable architectural effects. In this paper, a thorough and updated review of diagrid structural systems is provided. Simplified methodologies for the preliminary design and structural analysis are reported. Special attention is also paid to the optimization of the structural response based on the geometrical pattern. A discussion of the effect of local deformability, stability and shear-lag phenomenon is carried out. Results from nonlinear and dynamic analyses for the seismic assessment of diagrid systems are reported, and attention is also paid to the recent research on diagrid nodes. Eventually, an overview of twisted, tapered, tilted and freeform diagrid towers is carried out, with a final mention of hexagrids, another recent evolution of tubular systems for tall buildings.

scholarly journals New Trends Towards Enhanced Structural Efficiency and Aesthetic Potential in Tall Buildings: The Case of Diagrids

2020 ◽  
Author(s):  
Domenico Scaramozzino ◽  
Alberto Carpinteri ◽  
Giuseppe Lacidogna
Keyword(s):  
Structural Response ◽  
Tall Buildings ◽  
Structural Systems ◽  
Preliminary Design ◽  
Shear Lag ◽  
Computational Tools ◽  
Remarkable Improvement ◽  
Geometrical Pattern ◽  
Dynamic Analyses ◽  
Architectural Effects

Due to the increasing number of people and activities within the cities, tall buildings are exploited worldwide to address the need for new living and commercial spaces, while limiting the amount of used land. In recent decades, the design of tall buildings has undergone a remarkable improvement, thanks to the development of new computational tools and technological solutions. This has led to the realization of innovative structural systems, like diagrids, which allow the achievement of high structural performances and remarkable architectural effects. In this contribution, a thorough and updated review of diagrid structural systems is provided. Simplified methodologies for the preliminary design and structural analysis are reported. Special attention is also paid to the optimization of the structural response based on the geometrical pattern. A discussion of the effect of local deformability, stability and shear-lag phenomenon is carried out. Results from nonlinear and dynamic analyses for the seismic assessment of diagrid systems are reported, and attention is also paid to the recent research on diagrid nodes. Eventually, an overview of twisted, tapered, tilted and freeform diagrid towers is carried out, with a final mention of hexagrids, another recent evolution of tubular systems for tall buildings.

scholarly journals A new approach to the identification of distortion modes of thin-walled structures based on plate/shell theory

2019 ◽  
Vol 278 ◽  
pp. 03005
Author(s):  
Lei Zhang ◽  
Weidong Zhu ◽  
Aimin Ji ◽  
Liping Peng
Keyword(s):  
Cross Section ◽  
Shell Theory ◽  
Mode Shapes ◽  
Beam Model ◽  
Linear Superposition ◽  
New Approach ◽  
Thin Walled Structures ◽  
Dynamic Analyses ◽  
Thin Walled ◽  
The Cross

In this paper, a new approach to identify cross-section deformation modes is presented and utilized in the establishment of a high-order beam model for dynamic analyses of thin-walled structures. Towards this end, a systematic procedure to extract cross-section in-plane vibration shapes for a thin-walled cross-section is developed based on elastic plate/shell theory. Then the distortion shapes are separated from vibration shapes by removing the components of classic modes involved with the minimum value problem of 2-norm. Sequentially, curve fitting method is utilized to approximate the distortion shape functions along the cross-section midline. It should be noticed that these distortion modes are arranged in hierarchy consistent with the order that they are identified and the number of distortions to be identified depends on the required model precision. Based on this, Hamilton's principle is applied to formulate the dynamic governing equations of the beam by constructing its displacement field with the linear superposition of the cross-section mode shapes including distortions. Numerical examples are also presented to validate the new approach and to demonstrate its efficiency in the reproduction of three-dimensional behaviours of thin-walled structures in dynamic analyses.

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