scholarly journals Experimental and Theoretical Research on Shear Strength of Seismic-Damaged SRC Frame Columns Strengthened with Enveloped Steel Jackets

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Chengxiang C. X. Xu ◽  
Peng S. Sheng ◽  
Chong C. Wan
Keyword(s):  
Shear Strength ◽  
Cyclic Loading ◽  
Shear Capacity ◽  
Theoretical Research ◽  
Test Results ◽  
Steel Reinforced Concrete ◽  
Steel Jacket ◽  
Damage Degree ◽  
Shear Bearing Capacity ◽  
Ductility Capacity

The experimental and shear strength analytical investigations carried out on seismic-damaged steel reinforced concrete (SRC) columns strengthened with enveloped steel jacket subjected to cyclic loading are presented in this paper. Four 1/2-scale SRC columns were designed and manufactured and the postearthquake damage, enveloped steel jacket-confined, and destructive tests were carried out under lateral cyclic loading. The effects of postearthquake damage degree and enveloped steel jacket-confined on shear capacity and ductility capacity were all well examined. Test results indicate that the ductility of seismic-damaged SRC columns strengthened with enveloped steel jacket increases with the reduction of the postearthquake damage degree. The results indicate that the calculation formula of shear bearing capacity of SRC columns is feasible. Based on GB50010-2010, ACI318-08, and CSA-04, three different shear models were established, and the calculated values of shear capacity are quite different, and the analysis of the shear strength of RC in the strengthened seismic-damaged SRC column cannot be ignored. The formula is verified, and the calculated results are consistent well with the experimental results.

scholarly journals Shear Bearing Capacity of Framework Joints of Steel-Reinforced Concrete-Filled Circular Steel Tube

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Yongjun Lin ◽  
Kaiqi Liu ◽  
Tianxu Xiao ◽  
Chang Zhou
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Plastic Material ◽  
Element Model ◽  
Steel Tube ◽  
Shear Capacity ◽  
Steel Reinforced Concrete ◽  
Shear Mechanism ◽  
Circular Steel Tube ◽  
Shear Bearing Capacity

In this paper, in order to investigate the shear mechanism and shear capacity of framework joints of steel-reinforced concrete-filled circular steel tube (SRCFCST), a numerical finite element model reflecting the mechanical behavior of framework joints of SRCFCST column-reinforced concrete beam is established through simulating concrete by the damage plastic constitutive model and simulating steel by the ideal elastic-plastic material, and its effectiveness is verified by experimental data. On account of uniform distribution of circular steel reinforced around the section and without definite flange and web, the shear mechanism of the framework joints of SRCFCST is analyzed on the basis of equivalent circular steel tube (CST) to the rectangular steel tube. The method for calculating the superposed shear bearing capacities of the joint core area is proposed, which is composed of four parts, i.e., concrete inside tube, concrete outside tube, hooping and steel-reinforced web; and the corresponding formulas for calculating shear bearing capacity are established. The comparative analysis of joints’ shear bearing capacity indicates that the results of numerical simulation and shear bearing capacity formulas coincide well with the experimental values, which can provide reference for the nonlinear analysis and engineering design of similar joints.

Experimental Study on the Shear Behaviors of the SRHSHPC Composite Frame Columns

2008 ◽  
Vol 385-387 ◽  
pp. 149-152
Author(s):  
Liang Zhang ◽  
Shan Suo Zheng ◽  
Qing Niing Li ◽  
Lei Li ◽  
Bin Wang
Keyword(s):  
Shear Strength ◽  
Axial Compression ◽  
Concrete Strength ◽  
Shear Capacity ◽  
Test Results ◽  
Composite Columns ◽  
Axial Compression Ratio ◽  
Shear Mechanism ◽  
Composite Frame ◽  
Shear Behaviors

The shear behaviors of steel reinforced high strength and high performance concrete (SRHSHPC) composite frame columns are studied through the test on a number of SRHSHPC specimens with grade of concrete strength varied from C80 to C120 subjected to constant axial compression and cyclically varying horizontal load. Four influencing factors, namely, shear span ratio, axial compression ratio, stirrup ratio and concrete strength, are taken into consideration in the test, and strain gauges are respectively placed on steel web, stirrups as well as reinforcement bars to study the shear mechanism of SRHSHPC composite columns. According to test results, the shear failure patterns and shear mechanism of the specimens are discussed. By analyzing the contribution of the steel web, concrete, stirrups and reinforcement bars to the shear capacity, the shear mechanism of the SRHSHPC composite columns is figured out. Therefore, the influence of shear span ratio, axial compression ratio, stirrup ratios and concrete strength on shear behaviors of the SRHSHPC frame columns is clear. Finally, concrete truss model and principle of accumulation are applied to discuss the shear capacity and a calculation model for shear strength of the SRHSHPC composite columns is established. It is indicated that the shear behaviors of the SRHSHPC frame composite columns are excellent, and the calculated results of shear strength have good conformity with test results.

Mechanical behavior of compacted composite clays

2004 ◽  
Vol 41 (6) ◽  
pp. 1152-1167 ◽  
Author(s):  
M K Jafari ◽  
A Shafiee
Keyword(s):  
Shear Strength ◽  
Cyclic Loading ◽  
Mechanical Behavior ◽  
Pore Pressure ◽  
Aggregate Size ◽  
Core Material ◽  
Main Body ◽  
Test Results ◽  
Aggregate Content ◽  
Heterogeneous Matrix

Composite clay is a mixture of clay, as the main body, and aggregates, which are floating within the clayey matrix. The undrained behavior of composite clay in its natural or compacted state, e.g., core material of embankment dams, has great importance for geotechnical engineers. An extensive test program was conducted on kaolin–gravel and kaolin–sand mixtures to investigate various effects of aggregates on the mechanical behavior of the mixtures during strain-controlled monotonic and cyclic loadings. Monotonic test results reveal that increasing the aggregate content leads to a gradual increase in shear strength. Meanwhile, when the aggregate content is raised, the pore pressure increases for both monotonic and cyclic loading. It is also found that the presence of aggregates within a cohesive matrix leads to formation of a heterogeneous matrix in the clayey part of composite clays. This heterogeneity in turn causes pore pressure to be increased with an increase in the aggregate content during both monotonic and cyclic loading. In addition, test results show that aggregate size does not influence mechanical behavior appreciably. The results of this experimental research program are presented and discussed in this paper.Key words: composite clay, aggregate, shear strength, pore pressure, heterogeneous matrix, embankment dam.

Shear Capacity Analysis of SRHSC Frame Joints

2012 ◽  
Vol 166-169 ◽  
pp. 3298-3301
Author(s):  
Shan Suo Zheng ◽  
Xie Han ◽  
Qing Lin Tao ◽  
Wei Wang
Keyword(s):  
Shear Strength ◽  
High Strength Concrete ◽  
High Strength ◽  
Shear Capacity ◽  
Capacity Analysis ◽  
Shear Effect ◽  
Test Results ◽  
Ultimate Shear Strength ◽  
Strength Concrete ◽  
Calculation Results

Based on the tests of 5 steel reinforced high strength concrete (SRHSC) frame interior joint specimens, this paper discusses the mechanism of load transference in the joints. Shear effect of each part of the joints including concrete, steel web, band, flange frame and stirrup is analyzed. And then, the shear capacity equation of SRHSC frame joints is presented. Comparing the calculation results with the test results, it is indicated that the shear capacity equation proposed can correctly evaluate the ultimate shear strength for SRHSC joints.

Calculation method for the shear bearing capacity of diaphragm-through connections

2016 ◽  
Vol 20 (6) ◽  
pp. 906-916 ◽  
Author(s):  
Liao Wu ◽  
Zhihua Chen ◽  
Bin Rong
Keyword(s):  
Calculation Method ◽  
Three Dimensional ◽  
Low Frequency ◽  
Shear Behavior ◽  
Shear Capacity ◽  
Steel Beams ◽  
Test Results ◽  
Tubular Columns ◽  
Panel Zone ◽  
Shear Bearing Capacity

This article presents the results of experimental, numerical, and theoretical studies into the shear behavior of panel zone of diaphragm-through connections between concrete-filled square steel tubular columns and steel beams. The current design code does not cover the yield and ultimate shear strengths of such connections in China. Five tee-shaped diaphragm-through connections were fabricated and tested that they comply with the principle of “strong members and weak panel zone.” Three-dimensional nonlinear finite element models were developed to study the shear behavior of the panel zone under low-frequency cyclic loading. Based on the test results, the force transfer mechanism and the effect of different factors on the panel zone shear capacity were analyzed. The width and deformation of compression strut of core concrete were taken into account. A simple manual calculation method was also proposed for evaluating the shear strength of panel zone of diaphragm-through connections. Good agreement was found between theoretical and test results for both yield and ultimate shear strengths for connections.

Experimental Study on Shear Capacity of Broad-Limb Special-Shaped Columns

2011 ◽  
Vol 250-253 ◽  
pp. 2412-2417 ◽  
Author(s):  
Tie Cheng Wang ◽  
Xiang Shang Chen
Keyword(s):  
Experimental Study ◽  
Shear Strength ◽  
Cyclic Loading ◽  
Shear Capacity ◽  
Thickness Ratio ◽  
Skeleton Curve ◽  
Low Cyclic Loading ◽  
Current Code

The experimental study on shear capacity of 24 broad-limb special-shaped columns subjected to low cyclic loading were executed. The characteristic of hysteretic curve and skeleton curve were analyzed. The influences of the lateral bevel loads and the limb’s width-thickness ratio on the shear strength of the T-shaped and L-shaped broad-limb special-shaped columns were studied. The application of the shear formula in the current code for the broad-limb special-shaped columns was verified. It is shown that using the formula to calculate the shear strength of broad-limb special-shaped columns is safe from the results.

scholarly journals Improved Shear Strength Equation for Concrete Wide Beams

2019 ◽  
Vol 9 (21) ◽  
pp. 4513
Author(s):  
Min Sook Kim ◽  
Joowon Kang ◽  
Young Hak Lee
Keyword(s):  
Shear Strength ◽  
Standard Deviation ◽  
Transverse Shear ◽  
Shear Capacity ◽  
Transverse Reinforcement ◽  
Test Results ◽  
Shear Reinforcement ◽  
Support Conditions ◽  
Wide Beams

An improved shear strength equation is proposed that considers transverse reinforcement spacing and support conditions for concrete wide beams. Eighteen specimens were fabricated to examine the influence of transverse reinforcement spacing, the number of transverse shear reinforcement, and support width on shear capacity. From the test results, a shear strength equation is proposed and used to evaluate the shear strength of 23 specimens from previous studies and 18 from this study. For the 41 specimens, the proposed shear strength equation results had a mean of 1.16 and a standard deviation of 0.16. It showed that the proposed shear strength equation can predict shear strength reasonably well for concrete wide beams.

scholarly journals Experimental Study on Shear Capacity of Waste Fiber Recycled Concrete Shear Wall

2020 ◽  
Vol 198 ◽  
pp. 01037
Author(s):  
Xiaohu Li ◽  
Lei Li
Keyword(s):  
Cyclic Loading ◽  
Volume Ratio ◽  
Shear Wall ◽  
Shear Capacity ◽  
Recycled Concrete ◽  
Recycled Aggregate ◽  
Plane Shear ◽  
Shear Bearing Capacity ◽  
Loading Tests ◽  
Cyclic Loading Tests

In this paper, the shear capacity of waste fiber recycled concrete shear wall (FCSW) is studied by cyclic loading tests on 9 specimens. The failure of the specimens under low cycle cyclic loading is analyzed. The influence of waste fiber content, recycled aggregate content and axial compression ratio on the shear capacity of shear wall is studied. The results show that: the larger the volume ratio of waste fiber is, the higher the shear bearing capacity of shear wall is; the addition of recycled coarse aggregate will reduce the shear capacity of shear wall; the shear capacity of shear wall increases with the increase of axial pressure. On the basis of relevant specifications, the calculation formula of in-plane shear capacity of waste fiber recycled concrete shear wall is proposed considering the influence of waste fiber on shear capacity. By comparing with the test results, it can be found that the two formulas are in good agreement. The conclusion of the study can provide reference for the design of waste fiber recycled concrete shear wall.

Experimental Study of Shear Behavior of High-Strength Concrete Beams with High-Strength Stirrups

2010 ◽  
Vol 163-167 ◽  
pp. 972-976
Author(s):  
Qing Xuan Shi ◽  
Yuan Tian ◽  
Wei Hou
Keyword(s):  
Experimental Study ◽  
Shear Strength ◽  
Empirical Equation ◽  
Concrete Structures ◽  
High Strength ◽  
Shear Behavior ◽  
Shear Capacity ◽  
Test Results ◽  
Confining Stress ◽  
Concentrated Loading

This paper presents an experimental study of shear behavior of simply supported HSC beams reinforced with high-strength stirrups under monotonic concentrated loading. Six specimens with 150×300 mm square cross section were tested. The effects of three variables such as the stirrup ratio, stirrup yield strength and average confining stress are studied. Based on test results, the shear behavior of HSC beams with high-strength stirrups was evaluated. Combined with other test results, shear strength measured in test are compared with the values calculated according to the expressions proposed in this paper and in Code for design of concrete structures of China (GB 50010-2002). The study concludes that shear capacity is sparingly estimated by the Code for design of concrete structures of China (GB 50010-2002) when the average confining stress below 3MPa, but it is emphasis on insecurity when the average confining stress exceeds 3MPa. The empirical equation proposed in this paper for predicting the shear strength of HSC beams with high-strength stirrups is appropriate.

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