Analysis of energy dissipation and load-carrying capacity of rock during experiment

2004 ◽  
pp. 433-436
Author(s):  
Lijun Han ◽  
Yongnian He ◽  
Guoan Xu
Keyword(s):  
Energy Dissipation ◽  
Carrying Capacity ◽  
Load Carrying Capacity ◽  
Load Carrying

Research on Behavior of Ultra-High Toughness Cementitious Composites Reinforced Frame Joints

2011 ◽  
Vol 71-78 ◽  
pp. 794-798
Author(s):  
Jun Su ◽  
Shi Lang Xu ◽  
Dong Tao Xia
Keyword(s):  
Energy Dissipation ◽  
Carrying Capacity ◽  
Experimental Analysis ◽  
Experimental Results ◽  
Hysteretic Behavior ◽  
Cementitious Composites ◽  
Load Carrying Capacity ◽  
High Toughness ◽  
Load Carrying ◽  
Axial Compressive Ratio

In this article, through the seismic experimental analysis for six frame joints of ultra-high toughness cementitious composites, the load-carrying capacity, hysteretic behavior, energy dissipation and ductility of new joints are studied under different axial compressive ratio and the stirrups space. The experimental results show that the UHTCC joints have higher anti-cracking capacity and shear ductility. The UHTCC can reduce or even eliminate the amount of shear stirrups of the joint core. According to the analysis for the experiments, a theoretical calculating formula of shearing capacity is presented, whose calculating results agree well with the experimental results.

scholarly journals Seismic Upgrading of RC Wide Beam–Column Joints Using Steel Jackets

Buildings ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 203
Author(s):  
Giuseppe Santarsiero ◽  
Angelo Masi
Keyword(s):  
Reinforced Concrete ◽  
Energy Dissipation ◽  
Cyclic Loading ◽  
Carrying Capacity ◽  
Load Carrying Capacity ◽  
Seismic Capacity ◽  
Seismic Behaviour ◽  
Wide Beam ◽  
Rc Frames ◽  
Load Carrying

This study is devoted to experimentally investigate the seismic behaviour of reinforced concrete (RC) wide beam–column joints equipped with a steel jacketing seismic strengthening solution. To this end, three identical full-scale specimens have been tested under cyclic loading, one in the as-built condition and two after the application of the strengthening solutions. Details of selected solutions are described in the paper along with the experimental results which confirm how the application of simple and feasible steel interventions can effectively improve the seismic capacity of wide beam–column connections in RC frames, especially in terms of lateral load carrying capacity and energy dissipation.

Analysis of energy dissipation and load-carrying capacity of rock during experiment

2004 ◽  
pp. 433-436
Author(s):  
Guoan Xu ◽  
Lijun Han ◽  
Yongnian He
Keyword(s):  
Energy Dissipation ◽  
Carrying Capacity ◽  
Load Carrying Capacity ◽  
Load Carrying

Study on Seismic Performance of CFST Frame and Truss

2013 ◽  
Vol 438-439 ◽  
pp. 1529-1532
Author(s):  
Ya Bin Yang ◽  
Wan Lin Cao
Keyword(s):  
Experimental Study ◽  
Energy Dissipation ◽  
Bearing Capacity ◽  
Seismic Performance ◽  
Carrying Capacity ◽  
Steel Tube ◽  
Load Carrying Capacity ◽  
Scale Models ◽  
Load Carrying ◽  
Energy Dissipation Capacity

Concrete filled steel tube (CFST) got a good application in actual project. In order to further the seismic performance of the CFST, experiment was carried on two 1/5 scale models, which included one CFST frame, one CFST truss. Based on the experimental study, load-carrying capacity, stiffness, ductility, hysteretic property, energy dissipation and failure phenomena of each model were analyzed. The study shows that the seismic performance of CFST truss has high bearing capacity, stiffness, energy dissipation capacity and good ductility.

scholarly journals Effect of Stiffener Characteristics on the Seismic Behavior and Fracture Tendency of Steel Shear Walls

2020 ◽  
Vol 14 (54) ◽  
pp. 104-115
Author(s):  
Osman Shallan ◽  
Hassan Maaly ◽  
Mohammed Elgiar ◽  
Alaaeldin Elsisi
Keyword(s):  
Energy Dissipation ◽  
Carrying Capacity ◽  
Seismic Behavior ◽  
High Performance ◽  
Shear Walls ◽  
Plane Wall ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Energy Dissipation Capacity ◽  
Seismic Behaviors

The steel plate shear walls (SPSW) are currently being considered as a lateral load resisting system. A numerical method was proposed to have a comprehensive comparison of seismic behaviors of the plane wall (PW) and stiffened plane wall (SPW) with different stiffener characteristics, having the same weight, by using finite element modeling (FEM). The model was validated by using previously published experimental works. The material and geometric nonlinearity were taken into consideration. In this paper, the effect of using stiffeners with different cross-section shapes and directions will be studied, and key issues, such as load-carrying capacity, stiffness, and energy dissipation capacity, were discussed in depth. It was found that the proposed SPW with horizontal L, T, and U stiffeners could effectively improve load-carrying capacity by about 4, 20, and 23%, respectively. Diagonally and horizontally, SPWs with U stiffeners have higher energy-dissipation capacity than PW by about 57, 50%, respectively. This method provides a combination of high-performance stiffeners form and material for improving the seismic behavior of SPW.

scholarly journals Effect of Different Infill Types and Welding Separation on the Cyclic Behavior of Steel Shear Walls

2021 ◽  
Author(s):  
Osman Shallan ◽  
Hassan M. Maaly ◽  
Mohammed M. Elgiar ◽  
Alaa El-Din Elsisi
Keyword(s):  
Energy Dissipation ◽  
Carrying Capacity ◽  
Seismic Behavior ◽  
Steel Plate ◽  
Shear Wall ◽  
Load Carrying Capacity ◽  
Initial Stiffness ◽  
Steel Plate Shear Wall ◽  
Load Carrying ◽  
Energy Dissipation Capacity

Abstract Currently, the steel plate shear wall (SPSW) is commonly used in high-rise steel buildings as a lateral load resisting system. The SPSW consists of the boundary frame and infill plate. The objectives of this work are to study the effect of same weight different infill plate types, the effect of boundary frame characteristics, and the effect of infill plate weld separation on the seismic behavior of the SPSWs. A numerical method was proposed to have a comprehensive comparison of seismic behaviors of different types of SPSWs, having the same weight. The model was validated by using previously published numerical and experimental works. The study covers unstiffened (USPSW), stiffened (SSPSW), and corrugated steel plate shear wall (CSPSW). Similarly, the effect of boundary frame stiffness and welding separation characteristics between the plate and boundary frame will be studied, and key issues, such as load-carrying capacity, stiffness, and energy-dissipation capacity were discussed deeply. It was found that the SSPSW has better seismic behavior than USPSW and CSPSW. SSPSW has a higher load-carrying capacity than USPSW, and CSPSW by about 14, 24%, respectively. USPSW is more sensitive to the stiffness of the boundary frame than CSPSW. The plate welding separation has a greater impact on the initial stiffness than load-carrying capacity. When plate-column welding separation occurs, the initial stiffness, and the energy dissipation capacity reduces by about 21%, and 14%. Whereas, when the plate-beam separation occurs, the initial stiffness and energy dissipation capacity reduce by about 36%, and 20.5%.

Hysteretic Behavior of Semi-Rigid Composite Steel Frame with Cross-Stiffened Steel Plate Shear Walls

2010 ◽  
Vol 163-167 ◽  
pp. 205-210
Author(s):  
Hong Chao Guo ◽  
Ji Ping Hao ◽  
Feng Li
Keyword(s):  
Energy Dissipation ◽  
Carrying Capacity ◽  
Steel Plate ◽  
Shear Wall ◽  
Load Carrying Capacity ◽  
Steel Plate Shear Wall ◽  
Infill Panels ◽  
Load Carrying ◽  
Energy Dissipation Capacity ◽  
Stiffened Steel

Based on the experiment of a one-third scale, single-span, two-storey semi-rigid composite steel frame model with cross-stiffened steel plate shear wall under lateral cyclic loadings, the interactive effect between the joint stiffness and the cross-stiffened steel plate shear wall, the failure mode and energy dissipation mechanism of the structure system were analyzed, some important parameters were obtained in regard to load-carrying capacity, ductility, stiffness and energy dissipation capacity. The results showed that the specimen exhibited excellent ductility, energy dissipation capacity and great safety margin; the stiffness degradation of the joints was not serious, the requirement of ductility was lowered by setting up infill panels, the cooperative work between the frame and the steel plate shear wall was well; stiffeners improved the force condition of steel panels, increased the stiffness and load-carrying capacity of panels, lightened the pinch of hysteretic loops and reduced the noise and tremor of panels. The failure mode of the structure induced by buckling of stiffeners, local buckling and interactive buckling of infill panels，plastic hinges were formed at the bottom of column and semi-rigid connection, the in-plane deformation of specimen was bending failure. The research provides a basis for engineering application and theoretical analysis of the structural system.

scholarly journals Experimental Investigation on Seismic Behaviours of Reinforced Concrete Columns under Simulated Acid Rain Environment

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Hao Zheng ◽  
Shansuo Zheng ◽  
Yixin Zhang ◽  
Yonglong Cai ◽  
Ming Ming ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Energy Dissipation ◽  
Acid Rain ◽  
Carrying Capacity ◽  
Simulated Acid Rain ◽  
Deformation Capacity ◽  
Load Carrying Capacity ◽  
Rc Column ◽  
Visual Damage ◽  
Load Carrying

The purpose of this paper was to systematically investigate the influence of acid rain environments on the seismic behaviour of a reinforced concrete (RC) column. Six RC column specimens with shear span ratios of 2.84 were tested under low cyclic reversed loads after being subjected to accelerated corrosion tests in an artificial climate. The corrosion level and stirrup ratio were used as the control variables. The corrosion ratios of the longitudinal rebars ranged from 0 to 13.17%, and the corrosion ratios of the stirrups varied from 0 to 6.75%. The seismic behaviours of the column specimens were analysed with respect to visual damage, failure mode, hysteresis behaviour, load-carrying capacity, deformation capacity, stiffness degradation, and energy dissipation behaviour. The test results showed that the appearance characteristics of the six column specimens exhibited varying degrees of visual damage as a result of the simulated acid rain exposure. All six specimens were dominated by similar flexural-shear failures under low cyclic reversed loads, regardless of the distinctions in the corrosion levels or stirrup ratios. For the specimens with the same ratios of stirrup, as the corrosion level increased, the load-carrying capacity, deformation capacity, stiffness, and energy dissipation capacity were continuously decreased. For the specimens with the same levels of corrosion, the higher the stirrup ratio was, the stronger the restraint effect of the stirrups on the concrete, and the seismic behaviours of the specimens were obviously improved.

Dynamic Fracture and Dissipation Behaviors of Concrete at the Mesoscale

2015 ◽  
Vol 07 (03) ◽  
pp. 1550038 ◽  
Author(s):  
Christopher J. Lammi ◽  
Hongwei Li ◽  
David L. McDowell ◽  
Min Zhou
Keyword(s):  
Energy Dissipation ◽  
Carrying Capacity ◽  
Strong Influence ◽  
Performance Metrics ◽  
Stress Triaxiality ◽  
Uniaxial Stress ◽  
Dominant Mode ◽  
Load Carrying Capacity ◽  
Trade Offs ◽  
Load Carrying

Dynamic compaction and fracture of concrete is simulated at the mesoscale. Calculations are carried out under conditions of nominally uniaxial stress and uniaxial strain at a strain rate of 5000 s-1, allowing the effect of confinement, or stress triaxiality, on the response to be analyzed. A series of mesostructures, each member containing between 0–40% quartz aggregate and 0–5% pores by volume, is randomly generated to investigate the effect of mesostructure. The analysis focuses on load-carrying capacity and energy dissipation. Fracture within bulk phases and along interfaces in the structures is modeled using the cohesive finite element method. Dissipation through inelastic flow, fracture, and friction are separately tracked and quantified. Calculated results show that triaxiality has a strong influence on the dominant mode of energy dissipation and the volume fractions of aggregate and pores significantly influence the load-carrying capacity and energy dissipation capabilities of the materials. The framework and data presented can be used to support the design of materials with optimized trade-offs between competing performance metrics during dynamic loading.

An Experimental Study on the Seismic Behavior of Recycled Concrete Short Columns with Different Stirrup Ratio

2012 ◽  
Vol 256-259 ◽  
pp. 942-948
Author(s):  
Wan Lin Cao ◽  
Hong Ying Dong ◽  
Jian Wei Zhang
Keyword(s):  
Energy Dissipation ◽  
Compression Ratio ◽  
Carrying Capacity ◽  
Seismic Behavior ◽  
Recycled Concrete ◽  
Load Carrying Capacity ◽  
Reinforcing Bars ◽  
Axial Compression Ratio ◽  
Short Columns ◽  
Load Carrying

A comparative study is conducted on the seismic behaviors of five 1/2 scale recycled concrete short columns with 1.75 shear span ratios. The stirrup ratio in the specimens was changed from 0.4%, 0.9%, to 1.29% while the ratio of their longitudinal reinforcement was the same. Crossed reinforcing bars were set in two of the specimens. Cyclic loading test was carried out for the specimens under axial compression ratio 0.4. The stiffness and its degradation, load-carrying capacity, ductility, hysteretic behavior, energy dissipation and failure phenomena of each short column were analyzed. Results show that, with the increase of the stirrup ratio in the specimens, the shear failure of the specimens is getting lighter and lighter. And the load-carrying capacity, ductility, energy dissipation capacity are improved greatly, but the rate of the increase is tending to slow. Moreover, crossed reinforcing bars in the short columns are able to improve the seismic behavior. Recycled concrete can be used for structural columns with low axial compression ratio in earthquake area.

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