scholarly journals Earthquake Damage Reduction in Timber Frame Houses Using Small-Size Fluid Damper

2021 ◽  
Vol 7 ◽  
Author(s):  
Yutaka Nakamura ◽  
Hinako Fujii
Keyword(s):  
Analytical Model ◽  
Residual Deformation ◽  
Earthquake Damage ◽  
Earthquake Response ◽  
Load Bearing ◽  
Structural Wall ◽  
Timber Frame ◽  
Damage Reduction ◽  
Fluid Damper ◽  
Fluid Dampers

Timber frame structures are common traditional methods of housing construction, which use squared-off timber beams, columns, and walls as lateral load-bearing members. The seismic performance of timber frame houses can be secured by the load-bearing capacity of erected braces and walls; however, past major earthquakes have caused severe damage to earthquake-resistant timber frame houses. This study investigates the effect of small-size fluid dampers on the earthquake damage reduction in a timber frame house through earthquake response analyses. A detailed analytical model was generated based on an actual two-story timber frame house, which was designed for the highest seismic grade using the latest Japanese standards. Time-history response analyses were carried out for the analytical model subjected to the 2016 Kumamoto earthquake with and without small-size fluid dampers. The small-size fluid damper is equipped with a relief mechanism for the damping force, and its damping property can be expressed using the Maxwell model. Four or seven fluid dampers were installed in the first story of the model to investigate their effect on the earthquake damage reduction. The results of the earthquake response analyses show that the four and seven fluid dampers can reduce the maximum first-story drift angle by approximately one-third and half, respectively. The dampers suppress the residual deformation, control the elongation of the fundamental period during the response, and restrain the amplitude growth. A small-size fluid damper has an equivalent quake resistance to a conventional structural wall with a wall ratio of 3 plus.

Shake Table Testing of a Low Damage Steel Building with 2-4 Displacement Dependent (D3) Viscous Damper

2018 ◽  
Vol 763 ◽  
pp. 331-338
Author(s):  
Nikoo K. Hazaveh ◽  
Ali A. Rad ◽  
Geoffrey W. Rodgers ◽  
J. Geoffrey Chase ◽  
Stefano Pampanin ◽  
...  
Keyword(s):  
Viscous Fluid ◽  
Residual Deformation ◽  
Structural Response ◽  
Steel Structure ◽  
Experimental Tests ◽  
Base Shear ◽  
Moment Frame ◽  
Fluid Damper ◽  
Resistive Forces ◽  
Viscous Fluid Damper

To improve seismic structural performance, supplemental damping devices can be incorporated to absorb seismic response energy. The viscous fluid damper is a well-known solution. However, while they reduce displacement demand, they can increase overall base shear demand in nonlinear structures as they provide resistive forces in all four quadrants of force-displacement response. In contrast, Direction and Displacement Dependent (D3) viscous fluid dampers offer the opportunity to simultaneously reduce structural displacements and the total base-shear force as they only produce resistive forces in the second and fourth quadrants of a structural hysteresis plot. The research experimentally examines the response of a half-scale, 2-storey moment frame steel structure fitted with a 2-4 configuration D3 viscous fluid damper. The structure is also tested with conventional viscous dampers to establish a baseline response and enable comparison of results. Dynamic experimental tests are used to assesses the base shear, maximum drift and residual deformation under 5 different earthquakes (Northridge, Kobe, Christchurch (CCCC), Christchurch (CHHC), and Bam ground motion). Response metrics including base shear, the maximum structural displacement, and peak structural accelerations are used to quantify performance and to assess the response reductions achieved through the addition of dampers. It is concluded that only the 2-4 device is capable of providing concurrent reductions in all three of these structural response metrics.

Study on Isolation Device for Decrease of Displacement by Using Control of Friction

2005 ◽  
Author(s):  
Masanori Shintani ◽  
Yuichi Hattori ◽  
Tadashi Kotera
Keyword(s):  
Natural Frequency ◽  
Analytical Model ◽  
Friction Force ◽  
External Force ◽  
Simulation Analysis ◽  
Relative Displacement ◽  
Earthquake Damage ◽  
Experimental Results ◽  
Isolation Device ◽  
Analytical Program

This paper deals with an isolation device by using friction force. An isolation device decreases response acceleration and external force. Therefore, earthquake damage is reduced. However, an isolation device has a demerit for large relative displacement. A low horizontal natural frequency decreases the response acceleration. Therefore, in this research, a soft spring is attached to the base of the structure. The purpose of this research is to decrease the relative displacement by using the friction force. Then, an analytical model in consideration of the friction force is proposed, and a simulation is analyzed with well-known earthquake waves. Consequently, as the friction force increases, the results show that the relative displacement decreases. However, it is found that the response acceleration increases. But it is thought that optimal friction force exists, and this force decreases both the response acceleration and the relative displacement. This is considered to change with the properties of earthquake waves. Therefore, it is thought that the response acceleration and the relative displacement are decreased by changing the friction force to the most suitable value for earthquakes. This isolation device is examined with simulation analysis. An experimental device is made under the same conditions as the proposed analytical model. The analytical results are compared with the experimental results, and the validity of an analytical program is examined.

scholarly journals THE BEHAVIOUR OF SPECIAL OSB BOARDS UNDER FIRE CONDITIONS, The influence of OSB board´s fire coating on the fire resistance of light timber frame assemblies

2016 ◽  
Author(s):  
Petr Kuklík ◽  
Magdaléna Charvátová
Keyword(s):  
Fire Resistance ◽  
Fire Test ◽  
Test Laboratory ◽  
Fire Tests ◽  
Load Bearing ◽  
Timber Frame ◽  
Charring Rate ◽  
Fire Conditions

The paper is focused on the influence of fire resistant coatings used on OSB boards on the fire resistance of entire light timber frame wall assemblies. Two fire tests were performed in the fire test laboratory of PAVUS, a.s. in Veselí nad Lužnicí. The fire tests were performed on a load bearing wall. The wall dimensions were 3.0 (depth) x 3.0 (height) m. According to EN 1995-1-2, the calculation for fire paints and coatings is not possible. The aim of the paper is the determination of the influence of this type of coating on the OSB board’s charring rate, the determination of the start of charring of a timber stud and the fire resistance of the whole construction.

A predictive analytical model for the elasto-plastic behaviour of a light timber-frame shear-wall

2016 ◽  
Vol 102 ◽  
pp. 1113-1126 ◽  
Author(s):  
Daniele Casagrande ◽  
Simone Rossi ◽  
Roberto Tomasi ◽  
Gianluca Mischi
Keyword(s):  
Analytical Model ◽  
Shear Wall ◽  
Timber Frame ◽  
Plastic Behaviour

Structural behavior of load-bearing sandwich wall panels with GFRP skin and a foam-web core

2018 ◽  
Vol 25 (1) ◽  
pp. 173-188 ◽  
Author(s):  
Lu Wang ◽  
Zhimin Wu ◽  
Weiqing Liu ◽  
Li Wan
Keyword(s):  
Energy Dissipation ◽  
Analytical Model ◽  
Axial Stiffness ◽  
Skin Thickness ◽  
Load Bearing ◽  
Displacement Ductility ◽  
Compression Loading ◽  
Axial Strength ◽  
Wall Panels ◽  
Sandwich Wall

AbstractAn innovative load-bearing sandwich wall panel with glass fiber-reinforced polymer (GFRP) skins and a foam-GFRP web core (GSFW wall panels, where “GS” denotes GFRP skin and “FW” denotes foam-GFRP web core), which was manufactured using a vacuum-assisted resin infusion process, was developed in this paper. An experimental study involving nine specimens was conducted to validate the effectiveness of this panel for increasing the axial strength under edgewise compression loading. The effects of web thickness, web spacing, web height, and skin thickness on axial stiffness, displacement ductility, and energy dissipation were also investigated. The test results demonstrated that axial strength, axial stiffness, displacement ductility, and energy dissipation could be improved by increasing the web thickness, web height, and skin thickness. An analytical model that considers the confinement effect of foam and the local buckling of GFRP skin was proposed to predict the ultimate axial strength of GSFW panels. A comparison of the analytical and experimental results showed that the analytical model accurately predicted the ultimate axial strength of GSFW wall panels under edgewise compression loading. To simulate the low velocity impact by blindings that are rolled by the wind, an impact test was conducted and the residual axial strength of the wall panels after impact was also investigated.

scholarly journals SIMPLIFIED ANALYTICAL MODEL FOR EARTHQUAKE RESPONSE ANALYSIS OF BUILDINGS USING STYRENE-OLEFIN VISCOELASTIC DAMPERS

2001 ◽  
Vol 7 (13) ◽  
pp. 57-62
Author(s):  
Takehiko TERADA ◽  
Shao LI ◽  
Tetsuya HANZAWA ◽  
Takanori SATO ◽  
Tatsumi HORIE ◽  
...  
Keyword(s):  
Analytical Model ◽  
Earthquake Response ◽  
Response Analysis ◽  
Viscoelastic Dampers ◽  
Earthquake Response Analysis

scholarly journals Effect of wall base rotation on behaviour of reinforced concrete frame-wall building

1984 ◽  
Vol 17 (2) ◽  
pp. 106-120
Author(s):  
Daisuke Kato ◽  
Shunsuke Otani ◽  
Hideo Katsumata ◽  
Hiroyuki Aoyama
Keyword(s):  
Shear Walls ◽  
Earthquake Response ◽  
Response Analysis ◽  
Reinforced Concrete Frame ◽  
Structural Wall ◽  
Concrete Frame ◽  
Rotating Wall ◽  
Inelastic Behaviour ◽  
Earthquake Response Analysis ◽  
Better Than

This paper reports the tests of multistorey frames including a base rotating wall under lateral load reversals. The wall base rotation limited the input forces and prevented damage in the wall. The beams, however, were forced to deform much during the wall rotation. The inelastic behaviour of frame members and the uplifting rotation of a structural wall at its base were idealised, and the effect of wall base rotation on frame behaviour was studied through inelastic earthquake response analysis. The base rotating shear walls performed better than or as good as flexural yielding walls.

The Seismic Reinforcement Measures of through Type Timber Frame Joint Based on the Earthquake Damage Survey

2013 ◽  
Vol 671-674 ◽  
pp. 1380-1385
Author(s):  
Ling Xu Li ◽  
Zhong Tao ◽  
Liang Bin Qin ◽  
Mo Zhu ◽  
Rui Tian ◽  
...  
Keyword(s):  
Rural Areas ◽  
Soil Structure ◽  
Yunnan Province ◽  
Seismic Damage ◽  
Field Investigation ◽  
Earthquake Damage ◽  
Damage Survey ◽  
Timber Frame ◽  
Wooden Structure ◽  
Reinforcement Measures

Via the field investigation about farm building built on rural areas after the 2009, Ms=6.0 Yaoan earthquake in Yunnan province, China, the seismic damage of raw-soil structure and wooden structure have been put forward. Additionally, combined with the earthquake damage survey about the 1996 Lijiang and 2007 Ninger earthquake in Yunnan province, the seismic reinforcement schemes are proposed and appropriate costs are analyzed.

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