Seismic Performance and Confinement Reinforcement Design of High-Strength Concrete Columns Confined with High-Strength Stirrups

2021 ◽  
pp. 136943322199249
Author(s):  
Kun Yang ◽  
Qing-xuan Shi ◽  
Qi Lin
Keyword(s):  
Hysteresis Loop ◽  
Axial Compression ◽  
Compression Ratio ◽  
High Strength Concrete ◽  
Failure Modes ◽  
Failure Process ◽  
High Strength ◽  
Effective Measure ◽  
Strength Concrete ◽  
Axial Compression Ratio

This paper aims at analyzing the failure process, failure modes, characteristics of hysteresis loop and the ductility of 10 high-strength concrete (HSC) columns confined by high-strength complex stirrups under cyclic lateral force and a higher constant axial loading. It is indicated that the hysteresis loop of this type of columns still show plump spindle-shaped at higher axial compression ratio, which shows better ductility, energy dissipation and anti-collapse performance. Therefore, it is an effective measure of setting high-strength stirrups to ensure the good ductility of HSC columns under high axial compression ratio and to increase the limit value of axial compression ratio. The stress of transverse reinforcement is evaluated, which shows that high-strength stirrups have yielded when most of the specimens are destroyed, and the strength of stirrups can be fully developed to provide a better effect of restraint. Based on a large number of experimental data, the relationships between the limit drift, the ductility coefficient of HSC columns and axial compression ratio, stirrup characteristic values, covering layer as well as longitudinal reinforcement ratio are established; the calculation formula of minimum stirrups characteristic value of HSC columns at different seismic levels considering of axial compression ratio is presented.

Study on the Sensitivity Factors Affecting the Anti-Seismic Performances of Steel Reinforced High-Strength Concrete Columns

2013 ◽  
Vol 405-408 ◽  
pp. 845-849
Author(s):  
Yun Yun Li ◽  
Bao Sheng Yang
Keyword(s):  
Axial Compression ◽  
Seismic Performance ◽  
Compression Ratio ◽  
High Strength Concrete ◽  
High Strength ◽  
Concrete Columns ◽  
Limit Values ◽  
Strength Concrete ◽  
Axial Compression Ratio ◽  
High Strength Concrete Columns

Through the experimental tests on 6 steel reinforced high-strength concrete columns under low cyclic horizontal loads, the influence on anti-seismic performance of the columns under different axial compression ratio, stirrup ratio and steel form is analyzed, and that anti-seismic performance of the columns is affected not only by axial compression ratio, but also by steel form. For steel reinforced high-strength concrete columns with different steel forms, the limit values of axial compression ratio may be adjusted, while the influence of stirrup ratio is not prominent.

Study on the Behaviors of Steel Reinforced Concrete Cloumns

2011 ◽  
Vol 368-373 ◽  
pp. 248-252
Author(s):  
Bao Sheng Yang ◽  
Yun Yun Li
Keyword(s):  
Bearing Capacity ◽  
Axial Compression ◽  
Compression Ratio ◽  
High Strength Concrete ◽  
Seismic Behavior ◽  
Slenderness Ratio ◽  
High Strength ◽  
Concrete Columns ◽  
Axial Compression Ratio ◽  
High Strength Concrete Columns

The influence on columns behaviors of slenderness ratio are analyzed, and the influence on columns’ anti-seismic behavior of axial compression ratio, stirrup ratio and steel form are analyzed through the test on bearing capacity and level load of low cycle reverse of steel reinforced high-strength concrete columns. The bearing capacity of the long columns reduces along with the slenderness ratio increasing and augments along with concrete strength increasing. Probability of suddenly destruct increases along with the column slenderness ratio augmenting through the test. In addition, anti-seismic behavior of columns are effected not only axial compression ratio, but also steel form. Axial compression coefficien of the steel reinforced high-strength concrete columns with different steel form may be adjusted, however, the influence of stirrup ratio is very little on anti-seismic behavior of columns.

Seismic behavior of normal-strength concrete-filled precast high-strength concrete centrifugal tube columns

2019 ◽  
Vol 23 (4) ◽  
pp. 614-629
Author(s):  
Shaohua Zhang ◽  
Xizhi Zhang ◽  
Shengbo Xu ◽  
Xingqian Li
Keyword(s):  
Axial Compression ◽  
High Strength Concrete ◽  
Seismic Behavior ◽  
Failure Modes ◽  
Concrete Strength ◽  
High Strength ◽  
Test Results ◽  
Normal Strength Concrete ◽  
Strength Concrete ◽  
Normal Strength

This study reports the cyclic loading test results of normal-strength concrete-filled precast high-strength concrete centrifugal tube columns. Seven half-scale column specimens were tested under cyclic loads and axial compression loads to investigate their seismic behavior. The major parameters considered in the test included axial compression ratio, filled concrete strength, and volumetric stirrup ratio. The structural behavior of each specimen was investigated in terms of failure modes, hysteresis behavior, bearing capacity, dissipated energy, ductility, stiffness degradation, drift capacity, and strain profiles. Test results revealed that the concrete-filled precast high-strength concrete centrifugal tube column exhibited good integral behavior, and the failure modes of all columns were ductile flexural failures. Lower axial compression ratio and higher volumetric stirrup ratio resulted in more satisfactory ductile performance. In contrast, the filled concrete strength has a limited influence on the structural behavior of concrete-filled precast high-strength concrete centrifugal tube columns. Based on the limit analysis method, the calculation formula for the bending capacity of the concrete-filled precast high-strength concrete centrifugal tube column was developed, and the results predicted from the formulas were in good agreement with the experiment results.

scholarly journals Hysteretic performance research on high strength circular concrete-filled thin-walled steel tubular columns

2018 ◽  
Author(s):  
Jiantao Wang ◽  
Qing Sun
Keyword(s):  
Axial Compression ◽  
Compression Ratio ◽  
Failure Modes ◽  
High Strength ◽  
Dissipated Energy ◽  
Ultimate Limit State ◽  
Tubular Columns ◽  
Axial Compression Ratio ◽  
Hysteretic Performance ◽  
Thin Walled

Under violent earthquake motions, the severe damage in critical regions of structures could be ascribed to cumulative damage caused by cyclic loading. Using the high strength (HS) materials in concrete-filled steel tubular (CFST) columns is the effective way and popular tendency to promote the seismic behavior in anti-seismic design. In this paper, an experimental study on the hysteretic performance of high strength circular concrete-filled thin-walled steel tubular columns (HCFTST) columns was carried out. A total of six specimens were tested under constant axial compression combining cyclic lateral loading. The tested parameters were the different combinations of diameter-to-thickness (D/t) ratio, axial compression ratio (n) and concrete cylinder compressive strength (fc).The failure modes, load-displacement hysteretic curves, skeleton curves, dissipated energy and stiffness degradation were examined in detail. Through the experiment analysis result, it indicates that the ultimate limit state is reached as the severe local buckling and rupture of the steel tubes accompanying the core concrete crushing occur. Using high strength materials could have a larger elastic deformation capacity and the higher axial compression ratio within test scopes could motivate the potential of HS materials. In brief, the HCFTST columns with ultra-large D/t ratios under reasonable design could perform excellent hysteretic performance, which can be applied in earthquake-prone regions widely.

Axial Compression Ratio Limits of HSC Columns Confined with High-Strength Stirrups

2010 ◽  
Vol 163-167 ◽  
pp. 1024-1028 ◽  
Author(s):  
Kun Yang ◽  
Qing Xuan Shi ◽  
He Meng ◽  
Jin Jie Men
Keyword(s):  
Axial Compression ◽  
Compression Ratio ◽  
Axial Loading ◽  
High Strength ◽  
Concrete Columns ◽  
Lateral Force ◽  
Effective Measure ◽  
Axial Compression Ratio ◽  
High Strength Concrete Columns ◽  
Different Levels

A total of 10 high-strength concrete columns confined by high-strength complex stirrups were tested under cyclic lateral force and a higher constant axial loading. The results indicate that the hysteresis loop of this type of columns still shows plump spindle-shaped at higher axial compression ratio, with better ductility, energy dissipation capability and stronger anti-collapse ability; so setting closed high-strength stirrups is an effective measure to ensure the HSC columns good ductility and enhance its axial compression ratio limits. Additionally based on the experimental research and theoretical analysis, the limits of axial compression ratio of HSC columns at different levels of seismic are present in this paper.

Seismic behaviour of prestressed high-strength concrete piles under combined axial compression and cyclic horizontal loads

2018 ◽  
Vol 22 (5) ◽  
pp. 1089-1105 ◽  
Author(s):  
Xizhi Zhang ◽  
Sixin Niu ◽  
Jia-Bao Yan ◽  
Shaohua Zhang
Keyword(s):  
Finite Element ◽  
Axial Compression ◽  
High Strength Concrete ◽  
High Strength ◽  
Element Model ◽  
Test Results ◽  
Seismic Behaviour ◽  
Strength Concrete ◽  
Concrete Piles ◽  
Concrete Pile

In order to simulate the seismic behaviour of the prestressed high-strength concrete piles under working state, six full-scale prestressed high-strength concrete piles were tested under combined axial compression and cyclic horizontal loads. Different axial compression levels and prestressing levels of prestressed tendons were studied in this test programme. The failure mode, bending resistance, displacement ductility, stiffness degradation and energy dissipation of the prestressed high-strength concrete piles under different loading scenarios were measured and analysed. Test results indicated that the axial compression ratio and prestressing level of prestressed tendon significantly influenced the seismic performance of prestressed high-strength concrete piles. Theoretical models were developed to predict cracking, yielding and ultimate bending resistances of the prestressed high-strength concrete pile under combined compression and bending. Finite element model was also developed to simulate the ultimate strength behaviour of the prestressed high-strength concrete pile under combined compression and flexural bending. The accuracies of the theoretical and finite element model were checked through validations of their predictions against the reported test results.

Assessment of high-strength concrete encased steel composite columns subject to axial compression

2020 ◽  
Vol 164 ◽  
pp. 105765 ◽  
Author(s):  
Binglin Lai ◽  
J.Y. Richard Liew ◽  
Akshay Venkateshwaran ◽  
Shan Li ◽  
Mingxiang Xiong
Keyword(s):  
Axial Compression ◽  
High Strength Concrete ◽  
High Strength ◽  
Composite Columns ◽  
Strength Concrete ◽  
Steel Composite
Sign in / Sign up

Export Citation Format

Share Document