Damage Analysis of the SRHSHPC Frame Columns under Low Cyclic Reversed Horizontal Loading

2008 ◽  
Vol 385-387 ◽  
pp. 97-100 ◽  
Author(s):  
Shan Suo Zheng ◽  
Liang Zhang ◽  
Bin Wang ◽  
Lei Li ◽  
Lei Zeng
Keyword(s):  
Axial Compression ◽  
Compression Ratio ◽  
High Performance Concrete ◽  
Concrete Strength ◽  
Damage Model ◽  
Damage Development ◽  
Maximum Deformation ◽  
Shear Span ◽  
Axial Compression Ratio ◽  
Horizontal Loading

Based on tests under low cyclic reversed horizontal loading, damage behaviors of steel reinforced high strength and high performance concrete (SRHSHPC) frame columns are analyzed. The strength attenuation that considered as damage variable is figured out, and the influence of axial compression ratio, shear span ratio, stirrup ratio and concrete strength on the strength attenuation is discussed. The accumulative damage model, which can reveal the effect of cyclic loading and maximum deformation, is established for the SRHSHPC frame columns. The different phases of damage growth and their features for the SRHSHPC frame columns are analyzed, and the relation of damage and displacement is ascertained. Furthermore, the influence of axial compression ratio, shear span ratio, stirrup ratio and concrete strength on the damage development is also discussed. The results show that the damage model could give a rational description for damaging process of the SRHSHPC frame columns.

Seismic Damage Model for Steel Reinforced High Strength and High Performance Concrete Frame Joints

2007 ◽  
Vol 348-349 ◽  
pp. 837-840
Author(s):  
Shan Suo Zheng ◽  
Lei Zheng ◽  
Lei Li ◽  
Shun Li Che ◽  
Liang Zhang
Keyword(s):  
Axial Compression ◽  
Compression Ratio ◽  
High Performance ◽  
High Performance Concrete ◽  
Damage Model ◽  
High Strength ◽  
Seismic Damage ◽  
Damage Analysis ◽  
Concrete Frame ◽  
Axial Compression Ratio

Based on damage mechanics and failure model, a seismic damage model applying to steel reinforced high strength and high performance concrete frame joints is put forward, which takes deformation and cumulative damage into account. The damage performance of five tentative frame joints is compared and analyzed according to deformation and dissipated hysteretic energy under different loading levels, and the main influence factors on damage performance are established. The damage indexes of tentative frame joints are calculated, and the influence of strength grade of concrete and axial compression ratio on damage performance is discussed. The results indicate that the general damage is controlled by the damage of concrete in the earlier stage of loading, and by the damage of shape steel and stirrup in the later stage of loading; joints with lower axial compression ratio and lower concrete strength grade possess better hysteretic energy performance. Damage analysis provides an available means for the research of steel reinforced high strength and high performance concrete frame joints under seismic load. The damage model presented can be a reference for seismic damage analysis of the structure, prediction of earthquake damage in future, estimation of economic loss and repair after earthquake.

Effect of Axial Compression Ratio and Concrete Strength on Seismic Performance of Concrete Filled Steel Tube Beam-Column Joints

2014 ◽  
Vol 488-489 ◽  
pp. 704-707
Author(s):  
Ying Wang ◽  
Miao Li ◽  
Jin Hua Xu ◽  
He Fan
Keyword(s):  
Axial Compression ◽  
Seismic Performance ◽  
Compression Ratio ◽  
Concrete Strength ◽  
Steel Tube ◽  
Hysteresis Curve ◽  
Element Analysis ◽  
Concrete Filled Steel Tube ◽  
Axial Compression Ratio ◽  
Strength And Stiffness

Based on finite element analysis o f concrete filled steel tube beam-column joints under the single axial compression ratio and concrete strength, further research was done to analyze the seismic performance of concrete filled steel tube beam-column joints under different axial compression ratio and concrete strength. Beam-column joint which is connected by bolts with welding extended steel sheets at the beam root was analyzed. The results show that with the increase of axial compression ratio, strength and stiffness degradation of the joint accelerated gradually. Axial compression ratio at 0.3, 0.4 are appropriate values for joints specimen, load-displacement hysteresis curve of joint specimens is relatively plump and shows good seismic performance. Chance of concrete strength also had effect on seismic performance of joint specimen, but in contrast it is not so obviously.

Analysis on Axial Compression Bearing Capacity of Steel Reinforced Concrete Sandwich Node

2014 ◽  
Vol 501-504 ◽  
pp. 685-689
Author(s):  
Liang Li Xiao ◽  
Xiao Yu ◽  
Jian Wei Han
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Axial Compression ◽  
Compression Ratio ◽  
Concrete Strength ◽  
Technical Specification ◽  
Limit Values ◽  
Steel Reinforced Concrete ◽  
Axial Compression Ratio ◽  
Joint Construction

According to the limit values of axial compression ratio of steel reinforced concrete given by technical specification for steel reinforced concrete composite structure (JGJ138-2001), the axial force of steel reinforced concrete sandwich nodes calculated by MIDAS and the axial bearing capacity calculated by limit values of axial compression ratio are compared with an actual project. The results show that steel concrete columns with designed strength of C60, the strength more than of column concrete strength higher than C50 is the least requirement as to meet the axial compression ratio. The result provides a theoretical basis for the future of safety work and the sandwich joint construction.

Research on Defect and Adjustment of Complex Shear Wall Partitioned Design Method

2011 ◽  
Vol 243-249 ◽  
pp. 980-984
Author(s):  
Xue Yi Fu ◽  
Jia Xin Qu
Keyword(s):  
Axial Compression ◽  
Compression Ratio ◽  
Design Method ◽  
Concrete Strength ◽  
Shear Walls ◽  
Shear Wall ◽  
Axial Compression Ratio ◽  
Complex Shear ◽  
Section Design ◽  
Effective Flange Width

Both reference [1~2] method and partitioned design method (GB 50010-2002) were adopted to design complex shear walls, and some factors such as axial compression ratio, reinforcing ratio, section dimension, concrete strength grade and effective flange width were considered, then their limited loading capacity would be compared with each other when axial force was considered as a fixed value. It was found that there were some defects of complex shear wall partitioned design method. And its applied conditions were suggested, which included section restricted condition and limited value of axial compression ratio. When these conditions couldn’t be satisfied, the adjusted reinforcement partitioned design method of reference [3] was suggested. If the uneconomical problem of partitioned design method could not be accepted, whole section design method of reference [1~2] would be suggested.

The Analysis of Influencing Factors of Multi-Ribbed Composite Wall’s Skeleton Curve

2011 ◽  
Vol 250-253 ◽  
pp. 3355-3360
Author(s):  
Peng Chang ◽  
Hang Zeng
Keyword(s):  
Axial Compression ◽  
Compression Ratio ◽  
Linear Regression Analysis ◽  
Limit Load ◽  
Element Model ◽  
Multiple Linear Regression Analysis ◽  
Skeleton Curve ◽  
Shear Span ◽  
Axial Compression Ratio ◽  
Composite Wall

Based on the numerical simulation of the basic behavior of multi-ribbed composite wall under low frequency cyclic load, the skeleton curve is consistent with the experimental results. Also, the factors such as axial compression ratio, the intensity of filling blocks and the shear span ratio which may influence the shape of the skeleton curves are analyzed. The results shows that the yield load of multi-ribbed composite wall as well as the limit load are positively related to the block strength, while are negatively related to shear span ratio. Besides, by the method of finite element model, 9 groups of skeleton curve data of multi-ribbed composite wall in different axial compression ratio, shear span ratio and the intensity of filling blocks were simulated. On the basis of multiple linear regression analysis of the numerical results, the equations for calculating the feature points in the skeleton curve are given.

Experimental Research and Calculation Analysis on Shear Crack Load of Steel Reinforced Concrete T-Shaped Columns

2012 ◽  
Vol 166-169 ◽  
pp. 154-158
Author(s):  
Jun Tao Li ◽  
Xiang Gang Zhang ◽  
Zopng Ping Chen
Keyword(s):  
Reinforced Concrete ◽  
Axial Compression ◽  
Compression Ratio ◽  
Shear Crack ◽  
Load Test ◽  
Steel Reinforced Concrete ◽  
Shear Span ◽  
Axial Compression Ratio ◽  
Shear Cracking ◽  
Calculation Analysis

Based on the experiment of 8 steel reinforced concrete T-shaped columns specimens under monotonic static shear load, test value of shear crack load were obtained. Influence on shear crack load because of the shear span ratio, axial compression ratio and stirrup ratio was analyzed, the added coefficient θ of flange and α of steel were introduced. The calculation formula for shear cracking load was given. It is shown that shear cracking load reduces as the shear span ratio and increases with the axial compression ratio increases within a certain range, shear cracking load increases with stirrup ratio increasing, the calculated value of shear cracking load is in good agreement with the experimental data.

scholarly journals Calculation Model of Shear Capacity of Multiple Composite Core Column Joints Based on Softened Tension-Compression Bar Model

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Xu Wentao ◽  
Yang Chengyu
Keyword(s):  
Axial Compression ◽  
Compression Ratio ◽  
Engineering Application ◽  
Effective Area ◽  
Shear Capacity ◽  
Ratio Method ◽  
Shear Span ◽  
Axial Compression Ratio ◽  
Hysteretic Performance ◽  
Core Column

This paper aims to study the seismic performance of multiple composite core column joints. The influence of the stress mechanism, axial compression ratio, and shear span ratio on the failure mode, hysteretic performance, and shear capacity of the multiple composite core column joints was studied through the low-reversed cyclic loading tests of three specially designed and manufactured multiple composite core column joints. The angle ratio method is used to calculate the effective area of the vertical tie bar, and based on the mechanism of the softening tension-compression bar, the formula for calculating the shear capacity of the joint with multiple composite core column is established. In addition, it is also verified by the test data in this paper. The experimental results show that when the axial compression ratio increases from 0.26 to 0.45, the number and width of cracks at the beam end decrease. When the shear span ratio increases from 1.67 to 2.22, the number and width of cracks at the joint beam end increase. The average value and standard deviation of the ratio between the measured value and the calculated value of the shear capacity are 0.97 and 0.16, indicating that the proposed calculation method has a high agreement with the actual value and strong engineering application.

Effect of Axial Compression Ratio on Ductility and Bearing Capacity of Specially Shaped Columns with HRB500 Reinforcement

2012 ◽  
Vol 204-208 ◽  
pp. 1066-1069
Author(s):  
Yan Jun Li ◽  
Ping Liu
Keyword(s):  
Bearing Capacity ◽  
Axial Compression ◽  
Compression Ratio ◽  
Ultimate Load ◽  
Deformation Capacity ◽  
Displacement Ductility ◽  
Yield Load ◽  
Axial Compression Ratio ◽  
Low Cyclic Loading ◽  
Specially Shaped Column

Four specially shaped columns with HRB500 reinforcement were tested under low cyclic loading. The hysteretic curve, yield load, ultimate load, displacement ductility and rigidity degradation were compared in order to research the effect of axial compression ratio on ductility and bearing capacity of specially shaped column with HRB500 reinforcement. It is shown that the axial compression ratio has greater influence on ductility and bearing capacity. With the increase of axial compression ratio, the bearing capacity of HRB500 reinforcement concrete specially shaped column can be enhanced while the deformation capacity becomes worse. The hysteretic characteristic of specially shaped columns with HRB500 reinforcement is improved and the stiffness degeneration becomes slow with the decrease of axial compression ratio.

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