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.

Research on the Joint of Concrete-Filled Steel Tubular Column and Steel Beam

2013 ◽  
Vol 351-352 ◽  
pp. 174-178
Author(s):  
Ying Zi Yin ◽  
Yan Zhang
Keyword(s):  
Energy Dissipation ◽  
Failure Mechanism ◽  
Compression Ratio ◽  
Seismic Behavior ◽  
Strength Degradation ◽  
Steel Beam ◽  
Failure Characteristics ◽  
Static Test ◽  
Axial Compression Ratio ◽  
Energy Dissipation Capacity

With the pseudo-static test of 4 concrete-filled square steel tubular column and steel beam joint with outer stiffened ring, this paper discusses the failure characteristics, failure mechanism and seismic behavior of joints under different axial compression ratio. The analysis of the testing results shows: when reached the ultimate strength, the strength degradation and stiffness degradation of joints are slowly and the ductility is also good, the energy dissipation capacity of joints is much better.

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.

Seismic Performance of Haunched Beam Transfer Structures of Frame-Supported Short-Leg Shearwall with Varied Ratio of Short-Leg Shearwall Section Height to Thickness

2011 ◽  
Vol 255-260 ◽  
pp. 2308-2312
Author(s):  
Yong Qi ◽  
Ci Mian Zhu ◽  
Shu Sheng Zhong ◽  
Fang Wang ◽  
Yang Xiang
Keyword(s):  
Experimental Study ◽  
Energy Dissipation ◽  
Seismic Performance ◽  
Seismic Behavior ◽  
Low Frequency ◽  
Beam Structure ◽  
Beam Structures ◽  
Cyclic Lateral Load ◽  
Energy Dissipation Capacity ◽  
Seismic Tests

This paper deals with an experimental study on the seismic performance of haunched transfer beam structures with varied ratio of section height to thickness of short-leg shearwall (RHT). Based on the seismic tests of three 1:3-scaled specimens under low-frequency cyclic lateral load with constant vertical actions, the failure pattern, the hysteresis curves, the skeleton curves, the energy dissipation capacity, and the stiffness degradation laws of haunched transfer beam structures are investigated. The effects of different RHT (i.e., 5, 6 and 7) on the seismic performance of haunched transfer beam structures are emphasized and analyzed in detail. It is concluded that the rigidity of the structure is noticeable enhanced, the endogen force becomes more evenly distributed and the bearing is more rational with an increase of the RHT; the rationally designed haunched transfer beam structure has a good seismic behavior.

Experimental Study on Seismic Behavior of Recycled Concrete Perforated Brick Masonry

2010 ◽  
Vol 163-167 ◽  
pp. 1879-1882 ◽  
Author(s):  
Zhang Gen Guo ◽  
Wei Min Sun ◽  
Jian Wang ◽  
Jian Long Chen ◽  
Yi Fan Xu
Keyword(s):  
Energy Dissipation ◽  
Seismic Performance ◽  
Seismic Behavior ◽  
Low Frequency ◽  
Hysteresis Loops ◽  
Brick Masonry ◽  
Recycled Concrete ◽  
Load Test ◽  
Test Results ◽  
Backbone Curve

In order to investigate the seismic performance of recycled concrete perforated brick masonry, an experiment was conducted on three specimens of recycled concrete perforated brick walls subjected to low frequency reversed cyclic load test. The loading process, failure mechanism, ultimate bearing capacity was studied. The seismic behavior such as hysteretic characteristics, backbone curve, ductility, energy dissipation capacity were analyzed too. The test results show that the seismic performance of recycled concrete perforated brick masonry is similar to those of ordinary concrete perforated brick walls. The test results also indicate that the seismic behavior of recycled concrete perforated brick masonry is good. The specimens have good hysteresis loops and ductility, strong energy dissipation capacities.

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 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.

Cyclic Performance of a Lightweight Rapidly Constructible and Reconfigurable Modular Steel Floor Diaphragm

2018 ◽  
Vol 763 ◽  
pp. 541-548 ◽  
Author(s):  
Eugene Boadi-Danquah ◽  
Duncan MacLachlan ◽  
Matthew Fadden
Keyword(s):  
Energy Dissipation ◽  
Seismic Design ◽  
Seismic Behavior ◽  
Plate Thickness ◽  
Steel Plates ◽  
Hysteretic Behavior ◽  
Inelastic Behavior ◽  
Cyclic Performance ◽  
Environmentally Sustainable ◽  
Energy Dissipation Capacity

One approach to making modern structures more economically and environmentally sustainable is designing and constructing them to be adaptable to rapidly changing markets and building occupancies. At the same time, these structures are required to be resilient to seismic events. As a step towards meeting these goals, a lightweight, two-way, rapidly constructible and reconfigurable modular steel floor (RCRMSF) system has been developed. The system is fabricated from light-gauge steel plates sandwiching a grillage of orthogonally arranged cold formed Z-purlins, can span 9.1 m x 12.2 m, requires only girder supports, and fits within current steel construction framework. This study investigates the seismic behavior of the RCRMSF diaphragm through the use of high fidelity nonlinear finite element (FE) models. Six full-scale cantilever diaphragm models have been developed to study the effect of varying RCRMSF configurations and end support details. Both monotonic and cyclic loading protocols are used to determine the stiffness, strength, energy dissipation capacity, and general hysteretic behavior of the diaphragms. Based on the FE models, the behavior of the RCRMSF diaphragm is influenced primarily by the plate thickness and perimeter connection detail to the supporting steel frame. Overall, the RCRMSF has adequate diaphragm stiffness and strength, and shows favorable energy dissipation capacity due to its post-peak inelastic behavior. This observation implies that the RCRMSF can serve as an alternative solution to current seismic design and construction practices.

Seismic behavior and shear strength of new-type fired perforated brick walls with high void ratio

2018 ◽  
Vol 22 (5) ◽  
pp. 1035-1048
Author(s):  
Qiuwei Wang ◽  
Qingxuan Shi ◽  
Yi Tao
Keyword(s):  
Energy Dissipation ◽  
Bearing Capacity ◽  
Shear Force ◽  
Seismic Behavior ◽  
Void Ratio ◽  
Shear Capacity ◽  
Brick Wall ◽  
Test Results ◽  
New Type ◽  
Energy Dissipation Capacity

A new type of fired perforated brick with void ratio of more than 30% has been developed to improve the applicability of brick masonry structures. When the new perforated bricks are used for load-bearing walls, it will be a question whether the seismic performance of walls could satisfy the requirements under not obviously increasing the cost. This article presents an experimental study to investigate the seismic behavior and shear capacity of new-type perforated brick walls with high void ratio. For this purpose, six cross walls and three longitudinal walls with constructional columns under low reversed cyclic loading were tested, and the failure patterns, hysteretic characteristics, skeleton curves, energy dissipation capacity, ductility and reinforcement strain were observed. The test results indicate that (1) most new-type perforated brick wall specimens display shear failure, and hysteretic curves of cross walls are plump while there is some pinch phenomenon for longitudinal walls; (2) the specimens have considerable deformation and energy dissipation capacity, with displacement ductility factors of over 2.0; (3) the bearing capacity of walls increases but the ductility decreases with an increase of vertical compressive stress, and the bearing capacity and deformation all increase while considering the effect of horizontal reinforcement; and (4) the central brick wall and construction columns could resist shear force together before the peak load, while the shear force would be mainly born by construction columns at the later loading stage. Based on the test results, the constraint coefficient in current Chinese code was modified, and the calculation formula of shear capacity for cross walls was proposed. Comparison of calculated results with test data shows that the method will provide a way to predict the shear capacity of new-type fired perforated brick walls.

scholarly journals Investigation on Hysteretic Behavior of Embedded PVC Pipe Confined Reinforced High Strength Concrete Columns

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 737
Author(s):  
Zongping Chen ◽  
Yuhan Liang ◽  
Xuebing Zhao ◽  
Ji Zhou
Keyword(s):  
Energy Dissipation ◽  
Bearing Capacity ◽  
Failure Mechanism ◽  
Seismic Performance ◽  
High Strength Concrete ◽  
High Strength ◽  
Strength Concrete ◽  
Shear Bearing Capacity ◽  
Energy Dissipation Capacity ◽  
Pvc Pipe

To study the seismic performance of embedded polyvinyl chloride (PVC) pipe confined reinforced high-strength concrete (PVC-RHC) columns, five specimens are designed for cyclic loading test, which include three PVC-RHC column specimens, an embedded circle steel tube confined reinforced high-strength concrete (CST-RHC) column specimen, and a reinforced high-strength concrete (RHC) column specimen. The failure mechanism and morphology are revealed by experiments. The influences of PVC pipe diameter, axial compression ratio, and concrete strength on seismic performance indexes are analyzed. The research results indicate thhe following: all specimens displayed shear baroclinic failure. Compared with RHC specimens, the hysteretic curves of the PVC-RHC specimen and CST-RHC specimen were fuller; furthermore, their energy dissipation capacity, deformation, and ductility were more beneficial. With the increase of the diameter–length ratio and axial pressure, the energy dissipation capacity and deformation capacity of PVC-RHC specimens decreased. The shear bearing capacity of the PVC-RHC specimen calculated with “concrete structure design code” (GB 50010-2010) was smaller than the test results by 25%, showing an excessive safety margin. Thus, according to the failure mechanism of the PVC-RHC specimen, a new calculation formula of shear bearing capacity is deduced, which is in good agreement with the experimental results.

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