Experimental Study on Seismic Performance of Reactive Power Concrete Box Piers

2011 ◽  
Vol 94-96 ◽  
pp. 464-468
Author(s):  
Fei Wang ◽  
Zhi Fang ◽  
Xin Feng Yin
Keyword(s):  
Seismic Performance ◽  
Reactive Power ◽  
Axial Direction ◽  
Hysteresis Curve ◽  
Horizontal Load ◽  
Skeleton Curve ◽  
Static Test ◽  
Seismic Force ◽  
Box Piers ◽  
Curve Skeleton

Designing the reasonable cross-section and the structural conformation, three Reactive power concrete box piers samples were designed and studied under the constant axial force and reversed horizontal loads. The effect of the reversed horizontal load on the seismic performance of RPC box pier was studied. Such seismic performance as ductility, hysteresis curve, skeleton curve, etc. of RPC box piers is studied by pseudo-static test on three RPC box piers. The simulation results shows that RPC box piers exists excellent performance of resisting seismic force, the direction of horizontal load significant affect that performance, and the performance of resisting seismic force for the pier loaded by the force from main axial direction are better than that from other direction.

Experimental Study on Seismic Performance of CFRP Strengthened RC Frames Damaged by Earthquake

2013 ◽  
Vol 724-725 ◽  
pp. 1749-1753
Author(s):  
Qiu Mei Gao ◽  
Lai Wang ◽  
Ying Zhang
Keyword(s):  
Seismic Performance ◽  
Test Method ◽  
Hysteresis Curve ◽  
Rc Frame ◽  
Loading Test ◽  
Skeleton Curve ◽  
Static Test ◽  
Displacement Ductility ◽  
Rc Frames ◽  
Industry Standards

In this paper, we carried out low cyclic loading test over CFRP strengthened seismic-damaged RC frame named KJ-2 with the quasi-static test method, and compared the seismic performance with the same sections and materials RC frame named KJ-1 which was unstrengthened. We study the seismic performance such as hysteresis curve, skeleton curve, stiffness degradation, bearing capacity degeneration, displacement ductility, and energy dissipation capacity of the reinforced RC frame. On this basis, we analyzed the results of this test in order to obtain some guiding opinions for asymmetric span RC frames that strengthened by CFRP, and provide main preference basis or future national or industry standards.

scholarly journals An Experimental Study on Seismic Performance of Steel Truss Coupling Beams with Buckling-restrained Brace

2015 ◽  
Vol 9 (1) ◽  
pp. 134-139
Author(s):  
Weidong Sun ◽  
Kang Li ◽  
Xinyu Niu
Keyword(s):  
Energy Dissipation ◽  
Bearing Capacity ◽  
Hysteresis Curve ◽  
Coupling Beams ◽  
Skeleton Curve ◽  
Static Test ◽  
Plastic Energy ◽  
Buckling Restrained Brace ◽  
Steel Truss ◽  
Curve Skeleton

Through the pseudo-static test on the steel truss coupling beams with buckling-restrained brace, the bearing capacity, deformation capacity, hysteresis curve, skeleton curve, ductility, Energy Dissipation and stiffness degradation of such coupling beam are understood. The test results show that the steel truss coupling beams with buckling-restrained brace is characterized by bigger bearing capacity, higher ductility and good plastic energy dissipation capacity.

Experimental Studies on Transfer Beam Supported Frame Equipped with Fiber Reinforced Plastics Bars

2013 ◽  
Vol 717 ◽  
pp. 277-282
Author(s):  
Jin Chen ◽  
Shi Yong Jiang ◽  
Zhi Kun Lin ◽  
Ying Tao Li ◽  
Xiang Rong Zeng ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Seismic Performance ◽  
Experimental Studies ◽  
Failure Pattern ◽  
Hysteresis Curve ◽  
Fiber Reinforced ◽  
Static Test ◽  
Reinforced Plastics ◽  
Fracture Development ◽  
Fiber Reinforced Plastics

Through pseudo static test on three pieces of fiber reinforced plastics (FRP) transfer beam supported frame with three different reinforcement form, reinforcement ratio and the number of root reinforcement ,which are subjected to the vertical load and horizontal low cycle reciprocating load, the specimen fracture development law, yield mechanism, failure pattern, and bearing capacity, ductility, hysteresis characteristics and seismic performance are analyzed. The test results show that: yield mechanism and failure pattern of transfer beam supported frame equipped with fiber reinforced plastics reinforced bars are reasonable. The bearing capacity and deformation performance of transfer beam supported frame with top and bottom longitudinal bar replaced by FRP bars and symmetrical reinforced box are better than that of single upper replacement for FRP and lower replacement for FRP. The ductility performance of transfer beam supported frame equipped with fiber reinforced plastics bars is good, hysteresis curve is full, and have good seismic performance.

Effects of Beam Material Strength on the Seismic Performance of Composite CFST Column and Steel Beam Connection

2014 ◽  
Vol 578-579 ◽  
pp. 252-255
Author(s):  
Ya Feng Xu ◽  
Qian Chen ◽  
Pi Yuan Xu ◽  
Riyad S. Aboutaha
Keyword(s):  
Energy Dissipation ◽  
Seismic Performance ◽  
Hysteresis Curve ◽  
Material Strength ◽  
Steel Beam ◽  
Element Analysis ◽  
Skeleton Curve ◽  
Displacement Ductility ◽  
Steel Strength ◽  
New Type

Composite concrete filled steel tubular (CFST) column is a new type of column having high ductility and high load-bearing capacity. In this paper, the finite element analysis software ABAQUS is used to study the seismic performance of 3D joint of composite CFST column and steel beam. The hysteretic curve and skeleton curve are obtained by changing the strength grade of the steel beam; calculate the energy dissipation ratio of the joint. The results show that the higher the beam’s steel strength the higher ultimate capacity of the joint in the constant axial load. But the full degree of hysteresis curve, energy dissipation and displacement ductility of the space joint decrease.

scholarly journals Experimental and Numerical Research on Seismic Performance of Earthquake-Damaged RC Frame Strengthened with CFRP Sheets

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Lai Wang ◽  
Wei Xuan ◽  
Ying Zhang ◽  
Shuping Cong ◽  
Feng Liu ◽  
...  
Keyword(s):  
Seismic Performance ◽  
Fiber Reinforced Polymers ◽  
Experimental Result ◽  
Rc Frame ◽  
Carbon Fiber Reinforced Polymers ◽  
Skeleton Curve ◽  
Cfrp Sheets ◽  
Rc Frames ◽  
Moderate Earthquake ◽  
Curve Skeleton

In order to assess the seismic performance of damaged reinforced concrete (RC) frame strengthened with carbon fiber reinforced polymers (CFRP) sheets, two experimental specimens with identical reinforcement ratio and geometric dimensions were designed following Chinese code for seismic design of buildings. Experimental specimens consist of a reference (undamaged) RC frame, namely, KJ-1, and an earthquake-damaged RC frame strengthened with CFRP sheets, namely, KJ-2. A pseudostatic test was conducted on the two specimens to simulate moderate earthquake damage. The strengthening effects of CFRP sheets on damaged RC frame were discussed in terms of hysteretic curve, skeleton curve, stiffness degradation, and ductility. In addition, numerical method based on fiber model method was utilized to analyze the seismic performance of KJ-1 and KJ-2 and it is compared with the experimental result. Both the results confirm that the method of exterior bonding CFRP sheets on the damaged RC frame has restored the seismic performance such as bearing capacity, stiffness, and ductility to its original undamaged level, and some of the seismic performance of the damaged RC frame strengthened with CFRP sheets is even better than the undamaged one, which proves that the method has significant effect in strengthening postearthquake-damaged RC frames.

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.

scholarly journals Experimental Study on the Behavior of Existing Reinforced Concrete Multi-Column Piers under Earthquake Loading

2021 ◽  
Vol 11 (6) ◽  
pp. 2652
Author(s):  
Jung Han Kim ◽  
Ick-Hyun Kim ◽  
Jin Ho Lee
Keyword(s):  
Seismic Performance ◽  
Seismic Design ◽  
Bridge Piers ◽  
Scale Model ◽  
Inertia Force ◽  
Small Scale ◽  
Lap Splice ◽  
Existing Structures ◽  
Seismic Design Code ◽  
Seismic Force

When a seismic force acts on bridges, the pier can be damaged by the horizontal inertia force of the superstructure. To prevent this failure, criteria for seismic reinforcement details have been developed in many design codes. However, in moderate seismicity regions, many existing bridges were constructed without considering seismic detail because the detailed seismic design code was only applied recently. These existing structures should be retrofitted by evaluating their seismic performance. Even if the seismic design criteria are not applied, it cannot be concluded that the structure does not have adequate seismic performance. In particular, the performance of a lap-spliced reinforcement bar at a construction joint applied by past practices cannot be easily evaluated analytically. Therefore, experimental tests on the bridge piers considering a non-seismic detail of existing structures need to be performed to evaluate the seismic performance. For this reason, six small scale specimens according to existing bridge piers were constructed and seismic performances were evaluated experimentally. The three types of reinforcement detail were adjusted, including a lap-splice for construction joints. Quasi-static loading tests were performed for three types of scale model with two-column piers in both the longitudinal and transverse directions. From the test results, the effect on the failure mechanism of the lap-splice and transverse reinforcement ratio were investigated. The difference in failure characteristics according to the loading direction was investigated by the location of plastic hinges. Finally, the seismic capacity related to the displacement ductility factor and the absorbed energy by hysteresis behavior for each test were obtained and discussed.

Test and Numerical Study on the Seismic Performance of A Cable Restrainer for Girder Bridges

2019 ◽  
Author(s):  
Yitong Gu ◽  
Wancheng Yuan ◽  
Xinzhi Dang
Keyword(s):  
Seismic Performance ◽  
Numerical Study ◽  
Design Method ◽  
Lateral Displacement ◽  
Static Test ◽  
Girder Bridges ◽  
Continuous Girder Bridge ◽  
Service Conditions ◽  
Girder Bridge ◽  
Parametric Analyses

<p>In China, most of the support systems applied by short/medium span bridges are elastomeric pad bearings (EPBs). This type of support system has no reliable connections between bearings and girders as well as bearings and piers, which will cause structural damages due to large lateral displacement of bearings under earthquakes. The restrainers used currently could restrict the deformation of bridges under normal service conditions and could only restrict unidirectional displacement. Considering the disadvantages of these restrainers, a new restrainer called Connected Cable Restrainer (CCR), which can be used in short/medium span bridges supported by EPBs, is developed in this paper. The design principle, basic configuration, isolation mechanism and the design method of CCR are introduced. A pseudo static test to study the seismic performance of CCR is conducted. Seismic responses of a 3-span continuous girder bridge with CCR are simulated using OpenSees platform and parametric analyses of the two main parameters, lateral restraining displacement and restraining stiffness, are also carried out. Results show that the deformation of bridges under normal service conditions would not be restrained using CCR and the displacement responses can be mitigated effectively by using CCR through parameter optimization.</p>

Experimental and numerical investigation on seismic performance of hollow floor interior slab-column connections

2020 ◽  
pp. 136943322096527
Author(s):  
Longji Dang ◽  
Rui Pang ◽  
Rui Liu ◽  
Hongmei Ni ◽  
Shuting Liang
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Seismic Performance ◽  
Seismic Behavior ◽  
Element Model ◽  
Experimental Results ◽  
Element Analysis ◽  
Skeleton Curve ◽  
The North ◽  
Parallel Tube

This paper aims to investigate the seismic performance of hollow floor interior slab-column connection (HFISC). In this new connection system, several tube fillers are placed in slab to form hollow concrete. Moreover, locally solid zone, shear components, and hidden beam around the connections are installed to improve the bearing capacity and ductility of specimens. Three slab-column connections with different shear components were tested under cyclic loading and every specimen was constructed with parallel tube fillers in the north direction and orthogonal tube fillers in the south direction. The seismic behavior of specimens was evaluated according to the hysteretic response, skeleton curve, ductility, stiffness degradation, and energy dissipation. A finite element model was then developed and validated by a comparison with the experimental results. Based on experimental results and finite element analysis results, the relative effects of the hollow ratio of slab, the ratio of longitudinal reinforcement, the shear area of bent-up steel bars, and the arm length of welding section steel cross bridging were elucidated through parametric studies. This new slab-column connection showed better plastic deformation capacity while the bearing capacity was kept. Specimens with parallel tube fillers showed better seismic behavior than those of specimens with orthogonal tube fillers.

Energy Dissipation of Damper Rings for Thin-Walled Gears

2019 ◽  
Author(s):  
Zichao Li ◽  
Yanrong Wang ◽  
Xianghua Jiang ◽  
Hang Ye ◽  
Weichao Yang
Keyword(s):  
Energy Dissipation ◽  
Contact Surface ◽  
Strain Difference ◽  
Damping Ratio ◽  
Harmonic Balance Method ◽  
Axial Direction ◽  
Relative Displacement ◽  
Axial Displacement ◽  
Hysteresis Curve ◽  
Thin Walled

Abstract When the gear generates a nodal mode shape vibration, there are two directions of possible relative displacement between the corresponding points on the contact surface of the damper ring and the damper groove, which are circumferential direction and axial direction respectively. In this paper, the relative displacement of the damper ring and the damper groove are considered in two directions, and the calculation method of energy dissipation is proposed. When the nodal vibration occurs in the gear, due to the existence of the strain difference between the damper ring and the damper groove on the contact surface, circumferential slip of partial area would occur. The energy dissipation in one vibration cycle is accurately determined by analytical solution. Since the aviation gears are mostly thin-walled structures, the axial displacement is large when resonance occurs. Based on the discrete damper ring model which considers interaction between every segment of the ring, the first-order harmonic balance method is used to calculate the axial displacement of the damper ring under the given gear rim amplitude. And then the hysteresis curve area of each discrete segment on the contact surface is summed to obtain energy dissipation in one vibration cycle. In this paper, based on the energy method, the damping effect of the damper ring is predicted. The damping ratio curve obtained by energy dissipation in two directions is compared and analyzed. The occurrence conditions of the two directions of possible relative displacement and the influence of the damper ring parameters on both situations are summarized.

Sign in / Sign up

Export Citation Format

Share Document