Hysteretic energy dissipation capacity and the cyclic to monotonic drift ratio for rectangular RC columns in flexure

2009 ◽  
Vol 38 (7) ◽  
pp. 907-928 ◽  
Author(s):  
Karmen Poljanšek ◽  
Iztok Peruš ◽  
Peter Fajfar
Keyword(s):  
Energy Dissipation ◽  
Rc Columns ◽  
Hysteretic Energy ◽  
Drift Ratio ◽  
Energy Dissipation Capacity

scholarly journals Experimental Evaluation of Hysteretic Behavior of Rhombic Steel Plate Dampers

2014 ◽  
Vol 6 ◽  
pp. 185629 ◽  
Author(s):  
Qiang Han ◽  
Junfeng Jia ◽  
Zigang Xu ◽  
Yulei Bai ◽  
Nianhua Song
Keyword(s):  
Energy Dissipation ◽  
Yield Strength ◽  
Mild Steel ◽  
Steel Plate ◽  
Mechanical Performance ◽  
Hysteretic Behavior ◽  
Loading Test ◽  
Hysteretic Energy ◽  
Steel Material ◽  
Energy Dissipation Capacity

Rhombic mild-steel plate damper (also named rhombic added damping and Stiffness (RADAS)) is a newly proposed and developed bending energy dissipation damper in recent years, and its mechanical properties, seismic behavior, and engineering application still need further investigations. In order to determine the basic mechanical performance of RADAS, fundamental material properties tests of three types of mild-steel specimen including domestically developed mild-steel material with low yield strength were carried out. Then, a quasistatic loading test was performed to evaluate the mechanical performance and hysteretic energy dissipation capacity of these rhombic mild-steel dampers manufactured by aforementioned three types of steel materials. Test results show that yield strength of domestically developed low yield strength steel (LYS) is remarkably lower than that of regular mild steel and its ultimate strain is also 1/3 larger than that of regular mild steel, indicating that the low yield strength steel has a favorable plastic deformation capability. The rhombic mild-steel plate damper with low yield strength steel material possesses smaller yield force and superior hysteretic energy dissipation capacity; thus they can be used to reduce engineering structural vibration and damage during strong earthquakes.

scholarly journals Seismic Behaviour of TRC-Strengthened RC Columns under Different Constraint Conditions

2019 ◽  
Vol 26 (1) ◽  
pp. 360-378 ◽  
Author(s):  
Liu Ming ◽  
Yin Shiping ◽  
Chen Wenjie
Keyword(s):  
Energy Dissipation ◽  
Peak Load ◽  
Seismic Behaviour ◽  
Rc Columns ◽  
Displacement Ductility ◽  
Good Consistency ◽  
Energy Dissipation Capacity ◽  
Load Peak ◽  
Ductility Ratio ◽  
Better Than

AbstractThis paper studied the confinement effect of textile layers and the stirrup ratio on the seismic behaviour of TRC-strengthened RC columns using the numerical method. The results showed that the numerical values have good consistency with the experimental. Within the range of 1 to 3 layers of textile, with the increase of the number of textile layers, the peak load, displacement ductility ratio and energy dissipation capacity of the columns increased; however, these parameters only exhibited a limited increase when the textile layers continued to increase. In addition, the textile layers had a slight influence on the rate of the energy dissipation capacity. With the increase of the stirrup ratio, the yield load, peak load and ultimate load of the column did not change significantly, but the ductility coefficient and energy dissipation capacity of the column increased. Furthermore, for a TRC-strengthened column with three layers of textile and a stirrup ratio of 0.34%, the hysteresis loop fullness and the bearing capacity are better than those of a column with two layers of textile and a stirrup ratio of 0.67%. Therefore, it can be seen that TRC could play an efficient constraint role on the column when the stirrup arrangement is less.

scholarly journals Novel Ductile Enhancement in the Structural Characteristics of External Beam Column Joint with Potassium Activated Green Concrete Technology: An Artistic Establishment of Seismic Challenging Structures

2021 ◽  
Author(s):  
Mohana R
Keyword(s):  
Reinforced Concrete ◽  
Energy Dissipation ◽  
Structural Characteristics ◽  
Concrete Specimen ◽  
Concrete Technology ◽  
Finite Element Software ◽  
Drift Ratio ◽  
Joint Application ◽  
Column Joint ◽  
Energy Dissipation Capacity

Abstract Ductility and energy dissipation capacity of the beam column joints are the two prominent characteristics which governs the stability of the entire structure constructed in the seismic prone areas. In this paper, the effect of potassium activated geopolymer concrete in the exterior beam column joint application is investigated under low frequency cyclic loading. Numerical analysis has been done by using the finite element software Abaqus and compared with the experimental work. From the load deformation relationship, parametric studies are carried out in the aspects of ductility, stiffness degradation, energy dissipation capacity, drift ratio and cracking pattern. The use of potassium activated geopolymer technology in the exterior beam column joint application resulted in the improved ductility, energy dissipation capacity with superior ultimate load carrying capacity of 1.05% over conventional cement reinforced concrete beam column joints with special confining reinforcement confirmed by IS 13920 due to the enormous polymerisation activated by high molecular potassium ions.2.78% improved energy dissipation capacity of potassium based geopolymer specimen resulted in the lesser number of non structural cracks and 11.26% more deformation under 11.96% enlarged drift ratio than the conventional reinforced concrete specimen. From the observed results it is clearly noted that the implementation potassium activated green polymer technology in the beam column joints possessed enhanced ductility characteristics to protect the structure susceptible to seismic environment and resulted in the innovative, economical and sustainable mode of seismic resistant building construction.

scholarly journals Equivalent Viscous Damping Ratio Model for Flexure Critical Reinforced Concrete Columns

2018 ◽  
Vol 2018 ◽  
pp. 1-15
Author(s):  
Qin Zhang ◽  
Zong-yan Wei ◽  
Jin-xin Gong ◽  
Ping Yu ◽  
Yan-qing Zhang
Keyword(s):  
Reinforced Concrete ◽  
Energy Dissipation ◽  
Damping Ratio ◽  
Hysteretic Behavior ◽  
Viscous Damping ◽  
Ratio Model ◽  
Rc Columns ◽  
Equivalent Viscous Damping ◽  
Rc Structures ◽  
Energy Dissipation Capacity

In order to determine the energy dissipation capacity of flexure critical reinforced concrete (RC) columns reasonably, an expression for describing the hysteretic behavior including loading and unloading characteristics of flexure critical RC columns is presented, and then, a new equivalent viscous damping (EVD) ratio model including its simplified format, which is interpreted as a function of a displacement ductility factor and a ratio of secant stiffness to yield stiffness of columns, is developed based on the proposed hysteretic loop expression and experimental data from the PEER column database. To illustrate the application of the proposed equivalent damping ratio model, a case study of pushover analysis on a flexure critical RC bridge with a single-column pier is provided. The analytical results are also compared with the results obtained by other models, which indicate that the proposed model is more general and rational in predicting energy dissipation capacity of flexure critical RC structures subjected to earthquake excitations.

scholarly journals Experimental and Numerical Analysis of the Mechanical Properties of a Pretreated Shape Memory Alloy Wire in a Self-Centering Steel Brace

Processes ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 80
Author(s):  
Bo Zhang ◽  
Sizhi Zeng ◽  
Fenghua Tang ◽  
Shujun Hu ◽  
Qiang Zhou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Energy Dissipation ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Loading Rate ◽  
Effective Elastic Modulus ◽  
Maximum Energy ◽  
Numerical Results ◽  
Energy Dissipation Capacity

As a stimulus-sensitive material, the difference in composition, fabrication process, and influencing factors will have a great effect on the mechanical properties of a superelastic Ni-Ti shape memory alloy (SMA) wire, so the seismic performance of the self-centering steel brace with SMA wires may not be accurately obtained. In this paper, the cyclic tensile tests of a kind of SMA wire with a 1 mm diameter and special element composition were tested under multi-working conditions, which were pretreated by first tensioning to the 0.06 strain amplitude for 40 cycles, so the mechanical properties of the pretreated SMA wires can be simulated in detail. The accuracy of the numerical results with the improved model of Graesser’s theory was verified by a comparison to the experimental results. The experimental results show that the number of cycles has no significant effect on the mechanical properties of SMA wires after a certain number of cyclic tensile training. With the loading rate increasing, the pinch effect of the hysteresis curves will be enlarged, while the effective elastic modulus and slope of the transformation stresses in the process of loading and unloading are also increased, and the maximum energy dissipation capacity of the SMA wires appears at a loading rate of 0.675 mm/s. Moreover, with the initial strain increasing, the slope of the transformation stresses in the process of loading is increased, while the effective elastic modulus and slope of the transformation stresses in the process of unloading are decreased, and the maximum energy dissipation capacity appears at the initial strain of 0.0075. In addition, a good agreement between the test and numerical results is obtained by comparing with the hysteresis curves and energy dissipation values, so the numerical model is useful to predict the stress–strain relations at different stages. The test and numerical results will also provide a basis for the design of corresponding self-centering steel dampers.

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