Static and dynamic analysis of timber shear walls

1990 ◽  
Vol 17 (4) ◽  
pp. 643-651 ◽  
Author(s):  
A. Filiatrault
Keyword(s):  
Dynamic Equilibrium ◽  
Load Capacity ◽  
Shear Walls ◽  
Lateral Stiffness ◽  
Analysis Model ◽  
Equilibrium Equations ◽  
Seismic Behaviour ◽  
Nonlinear Load ◽  
Static And Dynamic Analysis ◽  
Timber Shear Walls

Light-frame wood structures have evolved in recent years to the point where their earthquake resistance is now questionable. Shear walls are commonly used to provide lateral stiffness and strength in wood buildings. Therefore, accurate predictions of the seismic behaviour of timber shear walls are necessary in order to evaluate the safety of existing timber buildings and improve design practice. This paper develops and validates a simple structural analysis model to predict the behaviour of timber shear walls under lateral static loads and earthquake excitations. The model is restricted to two-dimensional shear walls with arbitrary geometry. The nonlinear load –slip characteristics of the fasteners are used in a displacement-based energy formulation to yield the static and dynamic equilibrium equations. The model is embedded in a shear wall analysis program (SWAP) developed for microcomputer applications. The predictions of the model are compared with full-scale racking and shake table tests. The ability of the model to accurately predict the lateral stiffness, the ultimate lateral load capacity, and the complete earthquake response of timber shear walls is clearly demonstrated. Key words: dynamics, earthquakes, seismic response, timber construction, walls, wood.

Static and dynamic tests of timber shear walls fastened with nails and wood adhesive

1991 ◽  
Vol 18 (5) ◽  
pp. 749-755 ◽  
Author(s):  
A. Filiatrault ◽  
R. O. Foschi
Keyword(s):  
Shear Walls ◽  
Base Plate ◽  
Wood Adhesive ◽  
Adhesive Joints ◽  
Dynamic Tests ◽  
Seismic Behaviour ◽  
Timber Construction ◽  
Static And Dynamic Tests ◽  
Timber Shear Walls ◽  
Adhesive Capacity

This paper presents an experimental investigation into the seismic behaviour of timber shear walls fastened with nails alone or with nails in combination with wood adhesive. The responses of both types of shear walls were determined under slow, quasi-static racking loads and also under dynamic, earthquake-induced conditions. The experimental results showed that the introduction of the adhesive makes shear walls much stronger but also more brittle than conventional nailed walls. It was observed that shear walls incorporating nails and adhesive behaved almost linearly to failure. To obtain the most out of the adhesive capacity, however, the wood framing should be designed with special attention to the connections between framing members and the anchoring of the wall's base plate. These details control the capacity of the frame to sustain the loads induced by the stiffer adhesive joints. Key words: adhesive, earthquake, tests, timber construction, shear walls, wood.

A High-Order Numerical Manifold Method Based on B-Spline Interpolation and its Application in Structural Dynamics

2016 ◽  
Vol 08 (08) ◽  
pp. 1650093 ◽  
Author(s):  
Wei-Bin Wen ◽  
Kai Yao ◽  
Hong-Shuai Lei ◽  
Sheng-Yu Duan ◽  
Dai-Ning Fang
Keyword(s):  
Polynomial Interpolation ◽  
Dynamic Equilibrium ◽  
Spline Interpolation ◽  
Numerical Manifold Method ◽  
Equilibrium Equations ◽  
Energy Principle ◽  
Static And Dynamic Analysis ◽  
Computation Efficiency ◽  
Quintic Polynomial ◽  
Numerical Manifold

In this paper, a new numerical manifold method (NMM) is formulated on the basis of quintic polynomial interpolation. For linear elastodynamics analysis, the generalized instantaneous potential energy principle for the NMM is employed to obtain the formulation of its elastodynamic equilibrium equations. For the presented NMM, the penalty method is designed to deal with the boundary conditions. The initialization of the dynamic equilibrium equation coupled with its time integration method is exclusively designed. The proposed NMM is applied for static and dynamic analysis of an elastic beam to verify the validity of the proposed NMM. The calculation accuracy and computation efficiency analysis are conducted by comparing the NMM with the finite element method (FEM). Numerical result comparison shows that the proposed NMM possesses higher calculation accuracy than the FEM, especially for the gradient solutions. Time consumption analysis demonstrates that the proposed NMM provides far more accurate numerical results with lower time cost than the FEM.

scholarly journals A GIS-based three-dimensional landslide generated waves height calculation method

2019 ◽  
Author(s):  
Guo Yu ◽  
Mowen Xie ◽  
Lei Bu ◽  
Asim Farooq
Keyword(s):  
Spatial Data ◽  
Calculation Method ◽  
Dynamic Equilibrium ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Analysis Model ◽  
Equilibrium Equations ◽  
Gis Environment ◽  
Spatial State ◽  
Surge Height

Abstract. Combined with the spatial data processing capability of geographic information systems (GIS), a three-dimensional (3D) landslide surge height calculation method is proposed based on grid column units. First, the data related to the landslide are rasterized to form grid columns, and a force analysis model of 3D landslides is established. Combining the vertical strip method with Newton's laws of motion, dynamic equilibrium equations are established to solve for the surge height. Moreover, a 3D landslide surge height calculation expansion module is developed in the GIS environment, and the results are compared with those of the two-dimensional Pan Jiazheng method. Comparisons show that the maximum surge height obtained by the proposed method is 24.6 % larger than that based on the Pan Jiazheng method. Compared with the traditional two-dimensional method, the 3D method proposed in this paper better represents the actual spatial state of the landslide and is more suitable for risk assessment.

Monotonic and cyclic nail connection tests

1992 ◽  
Vol 19 (1) ◽  
pp. 97-104 ◽  
Author(s):  
J. D. Dolan ◽  
B. Madsen
Keyword(s):  
Grain Orientation ◽  
Analytical Study ◽  
Shear Walls ◽  
Displacement Curve ◽  
Nonlinear Load ◽  
Cyclic Shear ◽  
Principal Connection ◽  
Load Displacement ◽  
Timber Shear Walls ◽  
Monotonic Load

The results of monotonic and cyclic nail connection lateral tests are presented. The tests are part of an extensive experimental and analytical study to investigate the behaviour of timber shear walls subjected to earthquakes. The results from the nail connection tests were used in a larger study of timber shear walls. The nonlinear load–deflection curves were used for modelling the nail connection between the sheathing and the framing of the shear walls. The dependency of the nail connection on the grain orientation of the timber materials is investigated along with the evidence that the material properties of the nails are the primary parameters for the load–displacement characteristics of the connection made with hot-dipped, galvanized common nails. Both the monotonic and cyclic lateral behaviours of the connections are established. The premise that the hysteresis for the nail connection is contained within an envelope defined by the monotonic load–displacement curve is confirmed. These connection characteristics translate into similar behaviour in nailed timber shear walls. Therefore, an improved undertanding of the principal connection used in the construction of shear walls will also improve the understanding of the behaviour of shear walls. Key words: connections, nails, plywood, waferboard, monotonic, cyclic, shear wall.

Lateral performance of timber shear walls reinforced by prestressed diagonal cross bars

2018 ◽  
Vol 42 (2) ◽  
pp. 233-243
Author(s):  
HONGLIANG ZUO ◽  
Y LI ◽  
Jing DI ◽  
NAN GUO
Keyword(s):  
Shear Walls ◽  
Timber Shear Walls

scholarly journals Lateral resistance of mass timber shear wall connected by withdrawal-type connectors

2021 ◽  
Vol 67 (1) ◽  
Author(s):  
Sung-Jun Pang ◽  
Kyung-Sun Ahn ◽  
Seog Goo Kang ◽  
Jung-Kwon Oh
Keyword(s):  
Experimental Data ◽  
Seismic Design ◽  
Shear Walls ◽  
Shear Wall ◽  
Vertical Load ◽  
Lateral Resistance ◽  
Kinematic Models ◽  
Mass Timber ◽  
Timber Shear Walls ◽  
Timber Shear Wall

AbstractIn this study, the lateral resistances of mass timber shear walls were investigated for seismic design. The lateral resistances were predicted by kinematic models with mechanical properties of connectors, and compared with experimental data. Four out of 7 shear wall specimens consisted of a single Ply-lam panel and withdrawal-type connectors. Three out of 7 shear wall specimens consisted of two panels made by dividing a single panel in half. The divided panels were connected by 2 or 4 connectors like a single panel before being divided. The applied vertical load was 0, 24, or 120 kN, and the number of connectors for connecting the Ply-lam wall-to-floor was 2 or 4. As a result, the tested data were 6.3 to 52.7% higher than the predicted value by kinematic models, and it means that the lateral resistance can be designed by the behavior of the connector, and the prediction will be safe. The effects of wall-to-wall connectors, wall-to-floor connectors and vertical loads on the shear wall were analyzed with the experimental data.

scholarly journals Dynamic Equilibrium Equations in Unified Mechanics Theory

2021 ◽  
Vol 2 (1) ◽  
pp. 63-80
Author(s):  
Noushad Bin Jamal Bin Jamal M ◽  
Hsiao Wei Lee ◽  
Chebolu Lakshmana Rao ◽  
Cemal Basaran
Keyword(s):  
Energy Loss ◽  
Entropy Generation ◽  
Equilibrium Equation ◽  
Dynamic Equilibrium ◽  
Free Vibration Analysis ◽  
Newtonian Mechanics ◽  
Equilibrium Equations ◽  
Time Coordinate ◽  
Proposed Model ◽  
Laws Of Thermodynamics

Traditionally dynamic analysis is done using Newton’s universal laws of the equation of motion. According to the laws of Newtonian mechanics, the x, y, z, space-time coordinate system does not include a term for energy loss, an empirical damping term “C” is used in the dynamic equilibrium equation. Energy loss in any system is governed by the laws of thermodynamics. Unified Mechanics Theory (UMT) unifies the universal laws of motion of Newton and the laws of thermodynamics at ab-initio level. As a result, the energy loss [entropy generation] is automatically included in the laws of the Unified Mechanics Theory (UMT). Using unified mechanics theory, the dynamic equilibrium equation is derived and presented. One-dimensional free vibration analysis with frictional dissipation is used to compare the results of the proposed model with that of a Newtonian mechanics equation. For the proposed entropy generation equation in the system, the trend of predictions is comparable with the reported experimental results and Newtonian mechanics-based predictions.

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