Experimental Research on Seismic Behaviors of T-Shaped Concrete-Filled Steel Tubular Frame Joints

2011 ◽  
Vol 368-373 ◽  
pp. 38-41 ◽  
Author(s):  
Cheng Xiang Xu ◽  
Zan Jun Wu ◽  
Lei Zeng
Keyword(s):  
Energy Dissipation ◽  
Axial Compression ◽  
Design Principle ◽  
Hysteretic Behavior ◽  
Loading Tests ◽  
Energy Dissipation Capacity ◽  
Concrete Joints ◽  
Cyclic Loading Tests ◽  
Seismic Behaviors ◽  
Better Than

To understand mechanical characteristics and seismic behaviors of T-shaped concrete-filled steel tubular (CFST) joints, cyclic loading tests were carried out on four 1/2-scale exterior joints of top floor. The study includes joints’ mechanical character, failure mode, hysteretic behavior, ductility, energy dissipation and stiffness degradation under different height of beam and different axial compression ratios. The results indicate that frame joints satisfy the design principle of stronger joints and weaker components. The hysteretic loops are plump, ductility and energy dissipation capacity is better than that of ordinary reinforced concrete joints. Axial compression ratios can influence seismic behaviors of frame joints to some degree.

Experimental study on the seismic performance of traditional timber mortise-tenon joints with different looseness under low-cyclic reversed loading

2018 ◽  
Vol 22 (6) ◽  
pp. 1312-1328 ◽  
Author(s):  
Jianyang Xue ◽  
Rui Guo ◽  
Liangjie Qi ◽  
Dan Xu
Keyword(s):  
Energy Dissipation ◽  
Seismic Performance ◽  
Failure Modes ◽  
Artificial Defect ◽  
Reversed Loading ◽  
Energy Dissipation Capacity ◽  
Strength And Stiffness ◽  
Seismic Behaviors ◽  
Damage Type ◽  
Better Than

The majority of existing ancient timber structures have different degrees of damage. The looseness of mortise-tenon joints is a kind of typical damage type. In order to study the influence of looseness on the seismic performance of mortise-tenon joints, six through-tenon joints and six dovetail-tenon joints with scale 1:3.2 were fabricated according to the requirements of the engineering fabrication method of Chinese Qing Dynasty. Each type of joints consisted of one intact joint and five artificial loose joints, and the artificial defect was made to simulate looseness by cutting the tenon sectional dimension. Based on experiments of two types of joints under low-cyclic reversed loading, the seismic behaviors of joints such as failure modes, hysteretic loops and skeleton curves, strength and stiffness degradation, and energy dissipation capacity were studied. Moreover, the comparative analyses of seismic performance between two types of joints were carried out. The variation tendency of seismic behaviors of two types of joints has similarities, and there are some differences due to their different structural styles. The results indicate that squeeze deformation between tenon and mortise of two types of joints occurred. The shape of hysteretic loops of two types of joints is reverse-Z-shape, and the pinching effect of hysteretic loops becomes more obvious with the increase in looseness, among which of through-tenon joints is more obvious than that of dovetail-tenon joints. The carrying capacity, stiffness, and energy dissipation capacity of loose joints are significantly lower than that of the intact one, and the energy dissipation capacity of dovetail-tenon joints is better than that of through-tenon joints. The rotation angles of two types of joints can reach 0.12 rad, and the loose joints still have great deformation capacity.

Seismic Behavior Test of Recycled RC Frame Column with Different Axial Compression Ratios

2012 ◽  
Vol 517 ◽  
pp. 564-569
Author(s):  
Jin Song Fan ◽  
An Zhou ◽  
Li Hua Chen ◽  
Bing Kang Liu
Keyword(s):  
Energy Dissipation ◽  
Bearing Capacity ◽  
Axial Compression ◽  
Failure Modes ◽  
Construction Materials ◽  
Recycled Concrete ◽  
Hysteretic Behavior ◽  
Static Test ◽  
Concrete Frame ◽  
Energy Dissipation Capacity

Recycled concrete is a kind of new construction materials, and now received more and more attention from researchers and engineers, since its application in engineering projects can well cater to the increasing requirements of development for economic and environment-friendly society. Based on the pseudo static test of five recycled reinforcement concrete frame columns with different experimental axial compression ratios from 0.3 to 0.65, their failure modes, failure mechanism, hysteretic behavior, skeleton curves, bearing capacity, rigidity, ductility and energy dissipation capacity were discussed. Some possible influence factors and disciplines were also selected and analyzed. The study indicates that recycled reinforcement concrete frame columns in the case of relative low axial compression ratios usually exhibited similar and steady mechanical properties with common concrete columns. With the increase of axial compression ratio, its ductility and energy dissipation capacity are decreased and destruction forms tended to obvious brittle fracture, though its bearing capacity could slightly rise. The test results and analysis also manifest recycled concrete had expectative application potentials in most case.

scholarly journals The Influence of Different Parameter on the Seismic Behavior of SRUHSC Frame

2017 ◽  
Vol 2017 ◽  
pp. 1-14
Author(s):  
Yingchao Ma ◽  
Jinqing Jia
Keyword(s):  
Energy Dissipation ◽  
Failure Mode ◽  
Axial Compression ◽  
Failure Process ◽  
Hysteresis Curve ◽  
Loading Test ◽  
Skeleton Curve ◽  
Shear Span ◽  
Energy Dissipation Capacity ◽  
Seismic Behaviors

The seismic behaviors of steel reinforced ultrahigh strength concrete (SRUHSC) frames with different axial compression ratios and shear span ratios are experimentally studied through the reversed cyclic loading test of four specimens. The test results reveal that the seismic response of the frame is closely related to the failure process and failure mode of the columns. Based on the results, a systematic exploration is further conducted in terms of the characteristics of the skeleton curve, hysteresis curve, strength degradation, stiffness degradation, and energy dissipation capacity of the structure. The results indicate that as the axial compression ratio increases, and the shear span ratio decreases, the failure process of the entire structure and the weakening of the beam end are accelerated. Meanwhile, a change of the failure mode is also observed, accompanied by corresponding changes in the strength, stiffness, and energy dissipation capacity of the system.

Seismic Behaviors of Concrete-Filled T-Shaped Steel Tube Columns

2008 ◽  
Vol 400-402 ◽  
pp. 677-683 ◽  
Author(s):  
Yu Yin Wang ◽  
Yuan Long Yang ◽  
Su Mei Zhang ◽  
Jie Peng Liu
Keyword(s):  
Numerical Analysis ◽  
Energy Dissipation ◽  
Bearing Capacity ◽  
Axial Compression ◽  
Concrete Strength ◽  
Steel Tube ◽  
Compression Stress ◽  
Analysis Program ◽  
Energy Dissipation Capacity ◽  
Seismic Behaviors

Concrete-filled special-shaped (L-shaped, T-shaped, and cross-shaped, and etc.) steel tube column is a type of member in which concrete is poured into special-shaped steel tube so that steel and concrete support loads together. It improves the seismic behaviors of reinforced concrete special-shaped columns due to the better confining effects provided by the steel tube. A test research on the seismic behaviors of one concrete-filled T-shaped steel tube column with pseudo static method is presented and the load-displacement curve and skeleton curve are provided. Series of steel bar stiffeners were welded onto the steel tube in order to postpone the buckling of steel tube and to enhance confining effects. A numerical analysis program was developed using a fiber-based method. The constitutive model of concrete employed the modified Mander model, and that of steel employed a bi-linear model considering the Bausinger effect. The numerical analysis program was verified by the test results and parametric analysis was carried out, in which the influences of the ratio of axial compression stress to strength, steel tube thickness and concrete strength were mainly discussed. The following conclusions are obtained: with the increase of the ratio of axial compression stress to strength, the bearing capacity of member increases and the energy dissipation capacity improve, while the ductility deteriorates. With the increase of steel tube thickness, the initial rigidity, bearing capacity, ductility and energy dissipation capacity improves simultaneously. With the increase of concrete strength, the bearing capacity increases, the energy dissipation capacity improves, while the ductility deteriorates.

Experimental Research on the Influence of the Pile Type and Stirrup on the Seismic Performance of PHC Piles

2012 ◽  
Vol 256-259 ◽  
pp. 2079-2084 ◽  
Author(s):  
Tie Cheng Wang ◽  
An Gao ◽  
Hai Long Zhao
Keyword(s):  
Energy Dissipation ◽  
Cyclic Loading ◽  
Seismic Performance ◽  
High Strength Concrete ◽  
High Strength ◽  
Loading Tests ◽  
Energy Dissipation Capacity ◽  
Pile Type ◽  
Cyclic Loading Tests ◽  
Reversed Cyclic

The influence of the pile type and the stirrup on the seismic performance was evaluated based on the results of reversed cyclic loading tests on the four prestressed high strength concrete (PHC) piles. It is indicated that the AB-type pile has the better seismic performance than the A-type pile from the results. The bearing capacity does not increase obviously with decreasing of the stirrup spacing and increasing of the stirrup diameter. The degradation of stiffness does not decrease significantly with decreasing of the stirrup spacing and increasing of the stirrup diameter. The energy dissipation capacity is improved with increasing of the stirrup diameter and decreasing of the stirrup spacing.

Tests of Buckling-Restrained Braces Using Low-Yield Point Steel as Core Material

2012 ◽  
Vol 166-169 ◽  
pp. 3159-3165 ◽  
Author(s):  
Hong Yan ◽  
Peng Pan ◽  
Yuan Qing Wang ◽  
Toshio Makino ◽  
Xue Qi
Keyword(s):  
Energy Dissipation ◽  
Yield Point ◽  
Cyclic Stress ◽  
Hysteretic Behavior ◽  
Core Material ◽  
Small Displacement ◽  
The Core ◽  
Buckling Restrained Braces ◽  
Energy Dissipation Capacity ◽  
Cyclic Loading Tests

In order to reduce seismic responses of structures, low-yield point steel has been used for dampers due to its excellent energy dissipation capacity. However, few researches about the low-yield point steel dampers have been conducted in China so far. This paper mainly presents an experimental study on two buckling-restrained braces (BRBs) which take an in-line steel plate as the core and a double-web wide flange steel member as the outer unit. Low-yield point steel LY100 is taken as the core material and conventional steel SN400 is taken as the outer material. Uniaxial cyclic loading tests of two low-yield point steel BRBs (LYS-BRB) were conducted to investigate their hysteretic behavior and energy dissipation capacity. The two LYS-BRBs yielded at rather small displacement and their accumulated plastic deformation ratios reached 1639 and 1437, respectively. Significant strain-hardening behavior can be observed in the hysteresis curves of LYS-BRBs and the maximum cyclic stress reached 3.85 times the yield stress.

Energy Dissipation Capacity of Friction-Type Reinforcing Members Installed at a Transmission Tower

2008 ◽  
Author(s):  
Ji-Hun Park ◽  
Byoung-Wook Moon ◽  
Sung-Kyung Lee ◽  
Kyung-Won Min
Keyword(s):  
Energy Dissipation ◽  
Local Deformation ◽  
Test Results ◽  
Transmission Tower ◽  
Transmission Towers ◽  
Tower Structure ◽  
Loading Tests ◽  
Energy Dissipation Capacity ◽  
Reliable Design ◽  
Cyclic Loading Tests

Friction-type reinforcing members (FRMs) developed for the purpose of enhancing the wind-resistant performance of transmission towers are tested experimentally. The FRMs, in the middle of which slotted bolted connections (SBCs) are installed, are placed on the outside of tower legs, and provide additional damping and stiffness to the tower structure under bending deformations. Firstly, the SBCs used in the FRMs are tested for various frictional sliding interface conditions. Secondly, the FRMs are installed on a 1/2 scale plane tower substructure and cyclic loading tests are conducted. Energy dissipation capacity and effects from local deformations of the FRMs and joint slips are investigated. From the test results, remarkable energy dissipation capacity, reaching to the 2.4 times of that before the installation of the FRMs, is observed. However, the local deformation of the SBC and joint slip should be prevented for more reliable design of the FRMs.

scholarly journals Seismic Performance Evaluation of RC Columns Retrofitted by 3D Textile Reinforced Mortars

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 592
Author(s):  
Siyun Kim ◽  
Sung Jig Kim ◽  
Chunho Chang
Keyword(s):  
Energy Dissipation ◽  
Seismic Performance ◽  
Lateral Force ◽  
Hysteretic Behavior ◽  
Rc Columns ◽  
Seismic Performance Evaluation ◽  
Loading Tests ◽  
3D Textiles ◽  
Cyclic Loading Tests ◽  
Ductility Ratio

The paper investigates the seismic performance of rectangular RC columns retrofitted by a newly developed 3D Textile Reinforced Mortar (TRM) panel. The 3D-TRM used in this study consists of two components: self-leveling mortar and 3D textiles. Firstly, the flexural capacity of the 3D-TRM panel was investigated through the four-point flexural test. Secondly, a total of five specimens were constructed and experimentally investigated through static cyclic loading tests with constant axial load. One specimen was a non-seismically designed column without any retrofit, while the others were strengthened with either the 3D-TRM panel or conventional Fiber Reinforced Polymer (FRP) sheets. Experimental results in terms of hysteretic behavior, ductility ratio, and energy dissipation are investigated and compared with the cases of specimens with conventional retrofitting methods and without any retrofit. The maximum lateral force, ductility, stiffness degradation, and energy dissipation of RC columns with 3D-TRM panels were significantly improved compared with the conventional RC column. Therefore, it is concluded that the proposed retrofitting method can improve the seismic performance of non-conforming RC columns.

A combined experimental and numerical analysis on the seismic behavior of short reinforced concrete columns with different structural sizes and axial compression ratios

2017 ◽  
Vol 27 (9) ◽  
pp. 1416-1447 ◽  
Author(s):  
Liu Jin ◽  
Shuai Zhang ◽  
Dong Li ◽  
Haibin Xu ◽  
Xiuli Du ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Energy Dissipation ◽  
Axial Compression ◽  
Seismic Behavior ◽  
Load Capacity ◽  
Concrete Columns ◽  
Simulation Method ◽  
Reinforced Concrete Columns ◽  
Mesoscopic Simulation ◽  
Energy Dissipation Capacity

The results of an experimental program on eight short reinforced concrete columns having different structural sizes and axial compression ratios subjected to monotonic/cyclic lateral loading were reported. A 3D mesoscopic simulation method for the analysis of mechanical properties of reinforced concrete members was established, and then it was utilized as an important supplement and extension of the traditional experimental method. Lots of numerical trials, based on the restricted experimental results and the proposed 3D mesoscopic simulation method, were carried out to sufficiently evaluate the seismic performances of short reinforced concrete columns with different structural sizes and axial compression ratios. The test results indicate that (1) the failure pattern of reinforced concrete columns can be significantly affected by the shear-span ratio; (2) increasing the axial compression ratio could improve the load capacity of the reinforced concrete column, but the deformation capacity would be restricted and the failure mode would be more brittle, consequently the energy dissipation capacity could be deteriorated; and (3) the load capacity, the displacement ductility, and the energy dissipation capacity of the short reinforced concrete columns all exhibit clear size effect, namely, the size effect could significantly affect the seismic behavior of reinforced concrete columns.

PRELIMINARY STUDY ON NOVEL BEAM-TO-COLUMN CONNECTION BASED ON SMA PLATE

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Michael CH Yam ◽  
Ke Ke ◽  
Ping Zhang ◽  
Qingyang Zhao
Keyword(s):  
Friction Coefficient ◽  
Energy Dissipation ◽  
Numerical Study ◽  
Numerical Models ◽  
Numerical Technique ◽  
The Self ◽  
Hysteretic Behavior ◽  
The Novel ◽  
Energy Dissipation Capacity ◽  
Preliminary Study

A novel beam-to-column connection equipped with shape memory alloy (SMA) plates has been proposed to realize resilient performance under low-to-medium seismic actions. In this conference paper, the detailed 3D numerical technique calibrated by the previous paper is adopted to examine the hysteretic behavior of the novel connection. A parametric study covering a reasonable range of parameters including the thickness of the SMA plate, friction coefficient between SMA plate and beam flange and pre-load of the bolt was carried out and the influence of the parameters was characterized. In addition, the effect of the SMA Belleville washer on the connection performance was also studied. The results of the numerical study showed that the initial connection stiffness and the energy-dissipation capacity of the novel connection can be enhanced with the increase of the thickness of the SMA plate. In addition, the initial connection stiffness and energy-dissipation behavior of the novel connection can be improved by increasing the friction coefficient or pre-load of bolts, whereas the increased friction level could compromise the self-centering behavior of the connection. The hysteretic curves of the numerical models of the connection also implied that the SMA washers may contribute to optimizing the connection behavior by increasing the connection stiffness and energy-dissipation capacity without sacrificing the self-centering behavior.

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