scholarly journals Cyclic loading test of a bamboo-steel hybrid frame with novel energy-dissipation connections

BioResources ◽  
2020 ◽  
Vol 15 (2) ◽  
pp. 3504-3523
Author(s):  
Yanhua Wang ◽  
Yan Feng ◽  
Zirui Huang ◽  
Zhongfan Chen
Keyword(s):  
Energy Dissipation ◽  
Damping Ratio ◽  
Peak Load ◽  
Local Buckling ◽  
Hysteresis Loops ◽  
Simulation Models ◽  
Initial Stiffness ◽  
Loading Test ◽  
Element Analysis ◽  
Static Tests

Pseudo-static tests of a novel energy-dissipation connection, comprised of a hinge and two steel brackets, have proven their reliability and superior energy-dissipation capability. To verify the effectiveness of the connection further, a full-scale one-story one-bay engineered bamboo-steel hybrid frame jointed with the novel energy-dissipation connections was investigated through experimental test and finite element analysis (FEA) in this paper. The experimental results showed that the failure mode of the frame was restricted in the local buckling of the energy-dissipation panels (EDPs) in the innovative connections, whereas no obvious damage was observed in the other components of the frame. The hysteresis loops of the frame with energy dissipation connections revealed less pinching. Thus, the ductility and damping ratio of the engineered bamboo-steel frame can reach 1.46 and 14.1%, respectively. Based on the analysis of effectual simulation models in ABAQUS software, the relationship between the initial stiffness, the peak load, the ductility ratio of the hybrid frame and the size of EDP was studied. Recommendations are made for the design of the EDPs.

Seismic Performance of Medium Thick-Walled Cold-Formed Steel Top-and-Seat Angle Joint

2014 ◽  
Vol 501-504 ◽  
pp. 1609-1614
Author(s):  
Zhong Peng ◽  
Jun Huang ◽  
Shao Bin Dai ◽  
Ji Xiong Liu
Keyword(s):  
Energy Dissipation ◽  
Failure Modes ◽  
Mechanical Performance ◽  
High Strength ◽  
Initial Stiffness ◽  
Element Analysis ◽  
Equivalent Viscous Damping ◽  
Seat Angle ◽  
Cold Formed Steel ◽  
Energy Dissipation Capacity

3 medium thick-walled cold-formed steel top-and-seat angle joints were designed. The ABAQUS nonlinear finite element analysis on earthquake resistance behaviors of the joints were conducted under low cyclic loading. The results indicate that the failure processes and failure modes of 3 specimens are basically the same, the destruction of joints derive from buckling deformation of the top-and-seat angle and buckling of the steel beam flanges; the shapes of hysteresis curves of all specimens are obvious pinch together and present spindle, the displacement ductility factors are greater than 5.5, the equivalent viscous damping factors are greater than 0.158, all the specimens possess good energy dissipation capacity. The secant stiffness variations are almost similar, each specimen represents significant degradation. Increase the thickness of angle and diameter of high-strength bolt can improve the mechanical performance of the joints. Increase the bolt diameter, the ductility, energy dissipation capacity and initial stiffness enhance obviously, however, there is no apparent effect while increasing the thickness of angle.

Research on Design Method of Combined Steel Lead Energy Dissipation Structure

2011 ◽  
Vol 71-78 ◽  
pp. 526-530
Author(s):  
Xue Yuan Yan ◽  
Ai Qi ◽  
Wei Lin ◽  
Su Guo Wang
Keyword(s):  
Energy Dissipation ◽  
Design Method ◽  
Design Procedure ◽  
Hysteresis Loops ◽  
Shaking Table ◽  
Static Tests ◽  
Dissipation Structure ◽  
Hydraulic Servo ◽  
Control Principle ◽  
And Control

Construction and control principle of the new combined steel lead damper (NCSLD) were introduced, pseudo-static tests of NCSLD which would be used in the subsequent shaking table tests were carried out for the study of its mechanical properties using electro-hydraulic servo press-shear machine. Structural seismic design procedure using NCSLD is presented. An engineering example of seismic strengthening using NCSLD is provided. Results of tests and analyses indicate that NCSLD has full hysteresis loops which take on bilinearity; NCSLD is of strong energy dissipation ability and has obvious control effects for structural inter-story displacement and acceleration reactions.

Vibration of cold-formed steel floors with a steel form deck and gypsum-based self-leveling underlayment

2019 ◽  
Vol 22 (13) ◽  
pp. 2741-2754
Author(s):  
Yu Guan ◽  
Xuhong Zhou ◽  
Xinmei Yao ◽  
Yu Shi
Keyword(s):  
Finite Element ◽  
Fundamental Frequency ◽  
Damping Ratio ◽  
Point Load ◽  
Element Analysis ◽  
Static Tests ◽  
Floor Systems ◽  
Cold Formed Steel ◽  
Center Deflection ◽  
Deflection Limit

The vibration response and static deflection of cold-formed steel floor systems with a form deck and gypsum-based self-leveling underlayment were investigated through an experimental study and a finite element analysis. The floor system was constructed with cold-formed steel joists as supports and a cold-formed steel form deck subfloor with gypsum-based self-leveling underlayment on the surface. Dynamic tests and 1 kN static tests were carried out on three specimens, and design specifications including shear resistance construction and floor width were varied to explore their effects on the fundamental frequency, damping ratio, and center deflection of floors. Then, finite element models were developed and verified with the experimental test results, and parametric studies were conducted to consider the effect of boundary conditions on the vibration performance of the same floor systems. Based on the result, a minimum limit of fundamental frequency of 10 Hz and a maximum center deflection limit under a 1 kN point load of 1 mm were recommended for cold-formed steel floor systems with a form deck and gypsum-based self-leveling underlayment. Finally, methods to calculate the fundamental frequency and center deflection of this floor systems were proposed.

Experimental Study on a Beam-to-Column Connection Using Shape Memory Alloy

2011 ◽  
Vol 374-377 ◽  
pp. 2176-2179 ◽  
Author(s):  
Hong Wei Ma ◽  
Michael C. H Yam
Keyword(s):  
Shape Memory ◽  
Local Buckling ◽  
Hysteresis Loops ◽  
Seismic Behaviour ◽  
Static Tests ◽  
High Deformation ◽  
Steel Connections ◽  
End Plate ◽  
Extended End Plate ◽  
Plate Connections

For ductile beam-to-column connectiosn in steel frame, beam local buckling is difficult and very costly to repair in any post-disaster reconstruction. Shape memory alloys (SMAs) in their austenite states have the ability to recover their original shape after experiencing large deformations. Steel connections retrofitted using SMAs can be endowed with intelligent characteristics. This paper investigates extended end-plate connections using long shank SMA bolts. The SMA connection is designed using a new methodology of avoiding beam local buckling and adopting the strong end-plate. The connection deformations are supposed to concentrate on the SMA bolts. In order to study the seismic behaviour of the connections, quasi-static tests were conducted on both the SMA connection specimens. The test results indicate that the connection can show high deformation capacity with the maximum interstory drift angles beyond 0.02 rad. However, the beam was remained elastic during test and the deformations of the SMA connection were recoverable upon unloading. The load-drift hysteresis loops are flag-shaped for the SMA connection. This indicates that the connection has moderate energy dissipating capacity.

scholarly journals Experimental and Numerical Study on the Seismic Performance of Prefabricated Reinforced Masonry Shear Walls

2018 ◽  
Vol 8 (10) ◽  
pp. 1856 ◽  
Author(s):  
Weifan Xu ◽  
Xu Yang ◽  
Fenglai Wang ◽  
Bin Chi
Keyword(s):  
Energy Dissipation ◽  
Seismic Performance ◽  
Compression Ratio ◽  
Numerical Study ◽  
Load Capacity ◽  
Damping Ratio ◽  
Shear Walls ◽  
Inelastic Behavior ◽  
Element Analysis ◽  
Lateral Drift

The seismic performance of prefabricated reinforced concrete block masonry shear walls (PRMSWs) was studied. Five PRMSWs were tested under cyclic loading to evaluate the effect of the axial compression ratio and the distribution of the vertical rebar on the inelastic behavior. Based on the experimental results, the lateral load capacity, failure mode, lateral drift, ductility, stiffness degradation, energy dissipation, and the seismic performance stability of the specimens were analyzed. The finite element analysis of the specimens was conducted with ABAQUS, which agreed quite well with the laboratory findings. Relevant results showed that PRMSW exhibited favorable ductility and energy dissipation. The increase of the compression ratio led to stiffer, but more brittle, inelastic behavior of the specimens that had higher flexural strength. The shear walls that had concentrated vertical rebar at the sides exhibited relatively higher load capacity and less ductility compared to the walls that had evenly distributed rebar. The inelastic lateral drift limit of the PRMSW could be assigned 1/120. The equivalent viscous damping ratio of the PRMSW was 9–13% at ultimate load. These results provide a technical basis for the design and application of the PRMSW structures.

scholarly journals Experimental Study on Cumulative Damage Behavior of Steel-Reinforced Concrete Columns

2020 ◽  
Vol 2020 ◽  
pp. 1-16
Author(s):  
Lianjie Jiang ◽  
Guoliang Bai
Keyword(s):  
Energy Dissipation ◽  
Cyclic Loading ◽  
Bearing Capacity ◽  
Ground Motions ◽  
Peak Load ◽  
Cumulative Damage ◽  
Stiffness Degradation ◽  
Static Tests ◽  
Steel Ratio ◽  
Energy Dissipation Capacity

The cumulative damage behavior of SRC columns under far-field long-period ground motions was simulated and studied by quasi-static tests with the same displacement for 10 times. Quasi-static tests of 8 SRC columns were conducted under the horizontal cyclic loading with the same displacement for 10 times or 3 times, and then the effects of steel ratio, stirrup ratio, axial compression ratio, and number of cyclic loading on the cumulative damage of SRC columns under the far-field long-period ground motions were studied. The results showed that the number of cyclic loading had little effect on the peak load of the specimens, but had a significant effect on the deformation capacity, stiffness degradation, and energy dissipation capacity. Compared with the specimens after 3 cycles, the displacement ductility coefficient of specimens after 10 cycles was reduced by about 20%–26%, the ultimate hysteresis energy dissipation was reduced by 35%–48%, while the stiffness degradation rate was accelerated. After the peak load, the cumulative damage caused by multiple cyclic loading with the same displacement was more significant, which aggravated the reduction of bearing capacity and stiffness degradation. The smaller the steel ratio and stirrup ratio, the larger the axial compression ratio, and the greater the reduction of the bearing capacity and stiffness of specimens. However, accumulated damage caused by multiple cyclic loading with the same displacement had a slight impact on the energy dissipation capacity. Increasing the steel ratio and stirrup ratio can effectively improve the deformation capacity and energy dissipation capacity of the specimens and reduce the bearing capacity and stiffness degradation caused by cumulative damage.

scholarly journals Experimental and Finite Element Analysis of External ALC Panel Steel Frames with New Semi-Rigid Connector

2021 ◽  
Vol 11 (22) ◽  
pp. 10990
Author(s):  
Kewei Ding ◽  
Da Zong ◽  
Yunlin Liu ◽  
Shulin He ◽  
Wanyu Shen
Keyword(s):  
Energy Dissipation ◽  
Load Capacity ◽  
Peak Load ◽  
Hysteresis Curve ◽  
Element Analysis ◽  
Skeleton Curve ◽  
Engineering Economy ◽  
Rigid Connection ◽  
Good Energy ◽  
Curve Skeleton

In this paper, a new ALC panel connector was proposed. It has a good engineering economy and high fault tolerance. A quasistatic loading experiment was carried out to verify the feasibility of the external ALC panel steel frame under seismic loading. The test phenomena, hysteretic curve, skeleton curve, stiffness degradation, and energy dissipation of two sets of full-scale specimens were analyzed and discussed. Moreover, the simulation of pendulous Z-panel connectors with different thicknesses was carried out using ABAQUS software. The comparison reveals that the semi-rigid connection has a full hysteresis curve, good energy dissipation capacity, and a 15% increase in peak load capacity. Finally, similar results for different thicknesses in the use of pendulous Z-panel connectors reveal that using the 6 mm connector may be the most economical solution for engineering.

Numerical Model of Cold Press-Formed Square Steel Tube Columns Considered with Degradation Behavior due to Local Buckling and/or Fracture

2018 ◽  
Vol 763 ◽  
pp. 533-540
Author(s):  
Yuji Koetaka ◽  
Koichi Taniguchi ◽  
Iathong Chan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Numerical Model ◽  
Local Buckling ◽  
Steel Tube ◽  
Degradation Behavior ◽  
Loading Test ◽  
Element Analysis ◽  
Cold Press ◽  
Square Steel Tube

In steel building structures, local buckling and/or fracture of columns could occur during strong ground motions, furthermore complete collapse might be induced due to the column strength degradation. In this paper, cold press-formed square tube columns are targeted, and numerical model being able to trace precisely degradation behavior is proposed. In order to take account of both local buckling and fracture with low computational costs, multi-spring model which consists of some uni-axial springs is adopted. Axial force-deformation relationships of uni-axial springs are provided on flat area and corner area of square tube severally, and are separated into skeleton part and hysteresis part. All parameters on force-deformation relationship are identified based on finite element analysis results of short columns under monotonic or cyclic axial loading. Comparing between analysis results by multi-spring models and past cyclic loading test results or finite element analysis results, it is clarified that degradation behavior of cold press-formed square steel tube columns can be traced with high accuracy.

scholarly journals Experimental study and finite element analysis of energy dissipating outriggers

2016 ◽  
Vol 20 (8) ◽  
pp. 1196-1209 ◽  
Author(s):  
Qingshun Yang ◽  
Xinzheng Lu ◽  
Cheng Yu ◽  
Donglian Gu
Keyword(s):  
Finite Element ◽  
Energy Dissipation ◽  
Local Buckling ◽  
Tall Buildings ◽  
Initial Imperfection ◽  
High Strength ◽  
Test Results ◽  
Element Analysis ◽  
Global Buckling ◽  
Energy Dissipation Capacity

The outriggers are widely adopted in tall and super-tall buildings. Their energy dissipation capacity can significantly influence the nonlinear seismic responses of the entire building structure. Based on an actual tall building project, the structural responses and energy dissipation capacities of three different outriggers were studied through experiments and finite element analyses. The test results of conventional outrigger specimen showed a steep deterioration after peak strength and an unfavorable energy dissipation capacity due to the global buckling of the braces and the local buckling of the chords after flexural yielding. Using buckling-restrained braces and reduced beam sections in a new design of the outriggers, the energy dissipation capacity and the ductility of the outriggers were significantly improved. The yield and peak strengths were further improved with the use of high-strength steel in chords on a third specimen. The finite element simulation of the three specimens indicated that the initial imperfection of the specimens shall be considered, and the developed finite element models yielded good agreements with the test results. The outcome of this work can provide additional references for the application of the outriggers in tall buildings.

Experimental and Numerical Studies on Vertical Properties of a New Multi-Dimensional Earthquake Isolation and Mitigation Device

2013 ◽  
Vol 20 (3) ◽  
pp. 401-410 ◽  
Author(s):  
Zhaodong Xu ◽  
Liheng Lu ◽  
Benqiang Shi ◽  
Fuhgwo Yuan
Keyword(s):  
Experimental Study ◽  
Energy Dissipation ◽  
Damping Ratio ◽  
Excitation Frequency ◽  
Vertical Direction ◽  
Initial Stiffness ◽  
Earthquake Excitation ◽  
High Rise ◽  
Long Span ◽  
Numerical Studies

When designing critical structures such as long-span structures and high-rise buildings, earthquake excitation in the vertical direction, in addition to the horizontal direction, should also be taken into consideration. Study on new devices that can mitigate and isolate multi-dimensional (including both horizontal and vertical) earthquake actions has a remarkable significance. A new kind of multi-dimensional earthquake isolation and mitigation device was recently developed, and experimental study on vertical performances of the device under different excitation frequencies and amplitudes has been carried out in this paper. The characteristics of the vertical properties including the initial stiffness, the energy dissipation stiffness, the energy dissipation per cycle and the vertical damping ratio changing with excitation frequency and amplitude were studied, and the formulas describing the characteristics were proposed. It can be concluded that the initial stiffness and the energy dissipation stiffness increase slightly with increasing frequency, while the energy dissipation per cycle and the damping ratio decrease slightly with increasing frequency, the initial stiffness, the energy dissipation stiffness and the damping ratio will decrease slightly with increasing excitation amplitudes, and the proposed formulas can describe the vertical properties of the multi-dimensional earthquake isolation and mitigation device changing with excitation frequency and amplitude.

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