scholarly journals Experimental study on the reinforcement methods and lateral resistance of mortise-tenon jointed traditional timber frames

BioResources ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. 4039-4051
Author(s):  
Deshan Yang ◽  
Ming Xu ◽  
Zhongfan Chen
Keyword(s):  
Energy Dissipation ◽  
Seismic Design ◽  
Lateral Displacement ◽  
Stiffness Degradation ◽  
Test Results ◽  
Timber Frame ◽  
Lateral Resistance ◽  
Initial Stage ◽  
Steel Angle ◽  
Energy Dissipation Capacity

In order to study the lateral resistance of reinforced traditional Chinese timber frames with mortise-tenon connections, three cyclic tests were conducted on one-bay mortise-tenon jointed traditional timber frames. Three reinforcement methods, i.e., steel angle strengthening, wood brace, and Timu, were studied. Seismic performances were evaluated according to the experimental phenomena and the test results. The failure mode, hysteresis curves, skeleton curves, curves of stiffness degradation, and energy dissipation capacity of the three specimens were analyzed based on the tests. The test results showed that the wood frames had good deformability. The stiffness degradation of the timber frame was severe at the initial loading stage; however, the degradation rate tended to decrease after the initial stage. In addition, the energy dissipation increased as the lateral displacement increased. The wooden frames with mortise tenon joints strengthened by steel angle, wood brace, and Timu can achieve good aseismic results. The study can provide a theoretical basis for seismic design and reinforcing methods of traditional timber structures.

Seismic Behavior of Newly Constructed Three-Bay Steel X-Braced RC Space Frame

2014 ◽  
Vol 08 (04) ◽  
pp. 1450012
Author(s):  
Haozhi Tan ◽  
Liang Huang ◽  
Libo Yan ◽  
Hongwei Yi ◽  
Xin Tian
Keyword(s):  
Control System ◽  
Energy Dissipation ◽  
Failure Mechanism ◽  
Seismic Performance ◽  
Seismic Design ◽  
Seismic Behavior ◽  
Test Results ◽  
Space Frame ◽  
Plane Frames ◽  
Energy Dissipation Capacity

Bracing is one of the most effective systems which is widely used to improve the seismic performance of reinforced concrete (RC) plane frames. However, studies on the use of bracing in newly constructed RC space frame (RCSF) are rare. This paper presents the experimental results of two 1/4-scale, two-story, and three-bay RCSFs under cyclic loading. A RCSF without brace was designed and constructed as a control system, which was termed as "RCSF". Another one was constructed and strengthened with steel X-braces, which was termed as "SBRCSF". The seismic performance of RCSF was compared with those of SBRCSF. The test results show that compared with the RCSF, the seismic performance of the SBRCSF was improved significantly in terms of hysteresis loop, strength, stiffness degradation, and energy dissipation capacity. In addition, unlike the inter-story failure mechanism of the RCSF, the SBRCSF specimen exhibited an overall failure mechanism, which is significant for the seismic design of RCSFs. Moreover, the tested SBRCSF could bear loads in a manner similar to that of untested RCSF after the failure of the steel braces, thereby revealing the redundancy of SBRCSF and showing the advantageous of the use of steel braces for space frame.

Estimation of Seismic Energy Dissipation for Steel Slit Shear Walls Considering Out-of-Plane Buckling

2021 ◽  
Author(s):  
Yiming Ma ◽  
Liusheng He ◽  
Ming Li
Keyword(s):  
Energy Dissipation ◽  
Shear Walls ◽  
Seismic Energy ◽  
Thickness Ratio ◽  
Design Parameters ◽  
Test Results ◽  
Loading Test ◽  
Aspect Ratios ◽  
Out Of Plane ◽  
Energy Dissipation Capacity

Steel slit shear walls (SSSWs), made by cutting slits in steel plates, are increasingly adopted in seismic design of buildings for energy dissipation. This paper estimates the seismic energy dissipation capacity of SSSWs considering out-of-plane buckling. In the experimental study, three SSSW specimens were designed with different width-thickness ratios and aspect ratios and tested under quasi-static cyclic loading. Test results showed that the width-thickness ratio of the links dominated the occurrence of out-of-plane buckling, which produced pinching in the hysteresis and thus reduced the energy dissipation capacity. Out-of-plane buckling occurred earlier for the links with a larger width-thickness ratio, and vice versa. Refined finite element model was built for the SSSW specimens, and validated by the test results. The concept of average pinching parameter was proposed to quantify the degree of pinching in the hysteresis. Through the parametric analysis, an equation was derived to estimate the average pinching parameter of the SSSWs with different design parameters. A new method for estimating the energy dissipation of the SSSWs considering out-of-plane buckling was proposed, by which the predicted energy dissipation agreed well with the test results.

Seismic Rehabilitation of Beam-Column Joints Using FRP Sheets and Buckling Restrained Braces

2013 ◽  
Vol 479-480 ◽  
pp. 1170-1174
Author(s):  
Hee Cheul Kim ◽  
Dae Jin Kim ◽  
Min Sook Kim ◽  
Young Hak Lee
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Energy Dissipation ◽  
Seismic Performance ◽  
Reinforced Concrete Structures ◽  
Test Results ◽  
Seismic Rehabilitation ◽  
Buckling Restrained Braces ◽  
Column Joint ◽  
Energy Dissipation Capacity

The purpose of this study was to evaluate seismic performance of rehabilitated beam-column joint using FRP sheets and Buckling Restrained Braces (BRBs) and provide test data related to rehabilitated beam-column joints in reinforced concrete structures. The seismic performance of total six beam-column specimens is evaluated under cyclic loadings in terms of shear strength, effective stiffness, energy dissipation and ductility. The test results showed wrapping FRP sheets can contribute to increase the effect of confinement and the crack delay. Also retrofitting buckling restrained braces (BRBs) can improve the stiffness and energy dissipation capacity. Both FRP sheets and BRBs can effectively improve the strength, stiffness and ductility of seismically deficient beam-column joints.

Experimental Investigations on the Seismic Behavior of Precast Concrete Columns with Novel Box Connections

2019 ◽  
Vol 14 (02) ◽  
pp. 2050007
Author(s):  
Xizhi Zhang ◽  
Shengbo Xu ◽  
Shaohua Zhang ◽  
Gaodong Xu
Keyword(s):  
Energy Dissipation ◽  
Bearing Capacity ◽  
Failure Mode ◽  
Seismic Behavior ◽  
Load Transfer ◽  
Precast Concrete ◽  
Hysteretic Behavior ◽  
Experimental Investigations ◽  
Test Results ◽  
Energy Dissipation Capacity

In this study, two types of novel box connections were developed to connect precast concrete (PC) columns and to ensure load transfer integrity. Cyclic loading tests were conducted to investigate the seismic behavior of the PC columns with proposed connections as well as the feasibility and reliability of novel box connections. The failure mode, hysteretic behavior, bearing capacity, ductility, stiffness degradation and energy dissipation were obtained and discussed. The test results indicated that the all PC columns exhibited the ductile flexural failure mode and that the proposed connections could transfer the force effectively. The adoption of novel box connections could improve the deformation capacity and energy dissipation capacity of PC columns. A higher axial compression ratio could enhance the bearing capacity of PC column with proposed connection but would significantly deteriorate the ductility and energy dissipation capacity. Finite element models were developed and the feasibility of the models was verified by the comparison with the test results.

scholarly journals Effect of column foot tenon on behavior of larch column base joints based on concrete plinth

BioResources ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 6648-6667
Author(s):  
Xiaoli Han ◽  
Jian Dai ◽  
Wei Qian ◽  
Baolong Li ◽  
Yuanjun Jin ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Hysteretic Behavior ◽  
Timber Structures ◽  
Test Results ◽  
Rotational Angle ◽  
Static Test ◽  
Energy Dissipation Capacity ◽  
The Moment ◽  
Reversed Cyclic ◽  
Column Base

The wooden columns in timber structures of ancient buildings have column foot tenons of various sizes. The main reason for these differences is their use for different roof loads. Six full-scale specimens with different sizes of column foot tenon were designed and manufactured. The tree species used for the specimens was larch. The quasi-static test was conducted on the specimens that were used in timber structures of ancient buildings. The effects of column foot tenon size on the mechanical properties of larch wooden columns were studied. The moment-rotational angle hysteretic curves, moment-rotational angle skeleton curves, ductility, stiffness degradation, energy dissipation capacity, slippages between the wooden column and the plinth, and the damage of the column foot tenons were examined. The test results showed that the column foot tenon played an important role in the mechanical behavior of the wooden column under low-cycle reversed cyclic loading. The rotation of the column foot tenon improved the energy dissipation capacity of the wooden column. As the rotational angle of the column base increased, the column foot tenon had different degrees of damage. Different sizes of column foot tenon had their own advantages and hysteretic behavior.

scholarly journals Seismic Performances of SRC Special-Shaped Columns and RC Beam Joints Under Double-Direction Low-Cyclic Reversed Loading

2021 ◽  
Vol 8 ◽  
Author(s):  
Xiangyu Zhang ◽  
Qing Xia ◽  
Bailong Ye ◽  
Weiran Yan ◽  
Zhiheng Deng ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Energy Dissipation ◽  
Frame Structure ◽  
Stiffness Degradation ◽  
Hysteresis Cycle ◽  
Rc Beam ◽  
Conventional Concrete ◽  
Static Tests ◽  
Energy Dissipation Capacity ◽  
Beam Frame

Steel-reinforced concrete (SRC) special-shaped column and beam frame structure is a special structural form that can meet the requirements of high bearing capacity and satisfy the esthetic requirement of buildings. In this study, a new joint design approach is adopted to focus on the seismic behavior of SRC special-shaped column and reinforced concrete (RC) beam joints under low-cyclic double-directional reactions through pseudo-static tests with a controlled stirrup distance. The joints of SRC specimens were compared with those of RC specimens by controlling the area of steel and reinforcement, and hysteresis cycle skeleton curves and load and strain hysteresis cycles were analyzed. The specimen with profiled steel was found to have better energy dissipation capacity. The energy dissipation capacity and stiffness degradation of the nodes were analyzed. The test results showed that the energy dissipation capacity of the SRC joints was better than that of the conventional concrete column joints, and the stiffness degradation of RC joints was more significant than that of SRC joints.

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 Seismic Performance Degeneration of Assembled Concrete Columns with Grouting Defects

2021 ◽  
Author(s):  
Shengcai Li ◽  
Shengxiang Shi ◽  
Zhongchen Zhou
Keyword(s):  
Energy Dissipation ◽  
Seismic Performance ◽  
Seismic Energy ◽  
Concrete Columns ◽  
Monolithic Columns ◽  
Concrete Column ◽  
Test Results ◽  
Internal Defects ◽  
Energy Dissipation Capacity ◽  
Reinforcement Bar

In order to evaluate the influence of internal defects of semi-grouting sleeve connection on seismic performance of assembled monolithic columns, four specimens of assembled monolithic concrete column with semi grouting sleeve connecting reinforcement bar were fabricated with 10%, 20%, 30% internal defects. The test results show that (1) the assembled columns are all damaged by bending, the grouting layer of the assembled column can be pulled apart easily and the cracks develop more closely on the upper part of the sleeve; (2) the larger the internal defects in the sleeve, the less the cracks on the column, and the less sufficient the cracks development; (3) the seismic energy dissipation capacity of the column without defect is better than that of the defective columns.

scholarly journals Seismic performance of Chinese traditional timber frames

BioResources ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. 6135-6146
Author(s):  
Deshan Yang ◽  
Ming Xu ◽  
Zhongfan Chen
Keyword(s):  
Energy Dissipation ◽  
Shear Walls ◽  
Shear Wall ◽  
Initial Stiffness ◽  
Timber Frame ◽  
Lateral Resistance ◽  
Load Carrying ◽  
Practical Engineering ◽  
Technical Basis ◽  
Timber Shear Wall

Chinese traditional timber frames are known for their mortise-tenon joints and wooden planks shear walls. To investigate the seismic behavior of the structural system, three full-scale timber frames were subjected to in-plane quasi-static loading. The hysteresis characteristics, lateral load-carrying capacities, lateral stiffnesses, and energy dissipation capacities of the timber frames were investigated. The results showed that the hysteretic loops of all specimens exhibited pinching, and the column and beam components were nearly intact after the test. The traditional wooden frames had large deformability. The installation of the infilled timber shear wall brought great improvements in lateral resistance and energy dissipation to the bare frames. The initial stiffness of the timber frame infilled with timber shear wall was 0.113 kN/mm, which was 56.9% and 11.9% greater than those of the bare frame specimen F1 and specimen F2, respectively. The results from the experimental analyses can serve as a technical basis for the development of seismic design methods and strengthening designs of such structures in practical engineering.

Structural Performance of Disaster Relief Housing Units Subjected to Cyclic Loading

2013 ◽  
Vol 684 ◽  
pp. 111-115
Author(s):  
Tae Hyu Ha ◽  
Dae Jin Kim ◽  
Choong Hee Han
Keyword(s):  
Cyclic Loading ◽  
Disaster Relief ◽  
Housing Unit ◽  
Structural Performance ◽  
Test Results ◽  
Wall Panel ◽  
Nonstructural Components ◽  
Steel Angle ◽  
Lateral Strength ◽  
Energy Dissipation Capacity

In this paper, a new disaster relief housing unit is proposed, and its structural performance under cyclic loading conditions is investigated. This housing unit is composed of a series of identical unit wall panels, which are made up of steel angle frames, steel rods for diagonal bracing and sheeting elements. The lateral load resisting capacity of only a single wall panel is examined by performing a test on three specimens. The theoretical lateral strength of the wall panel is estimated and compared with the test results. The contribution of sheeting elements, generally treated as nonstructural components, is considered, and the energy dissipation capacity of the proposed unit is also evaluated. The results of the test show that the addition of sheeting elements is helpful to enhance the peak lateral strength of the panel frame and the steel diagonal bracing is very effective in enhancing the peak strength of the unit wall panel at initial stages, but not the overall ductility of the structure.

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