Size effect on seismic performance of high-strength reinforced concrete columns subjected to monotonic and cyclic loading

2019 ◽  
Vol 183 ◽  
pp. 206-219 ◽  
Author(s):  
Zhenbao Li ◽  
Chunyi Yu ◽  
Yongping Xie ◽  
Hua Ma ◽  
Zhenyun Tang
Keyword(s):  
Reinforced Concrete ◽  
Cyclic Loading ◽  
Size Effect ◽  
Seismic Performance ◽  
High Strength ◽  
Concrete Columns ◽  
Reinforced Concrete Columns

scholarly journals Size Effect on the Seismic Performance of High-Strength Reinforced Concrete Columns with Different Shear Span-to-Depth Ratios

2018 ◽  
Vol 2018 ◽  
pp. 1-19
Author(s):  
Chunyi Yu ◽  
Hua Ma ◽  
Yongping Xie ◽  
Zhenbao Li ◽  
Zhenyun Tang
Keyword(s):  
Reinforced Concrete ◽  
Size Effect ◽  
Seismic Performance ◽  
Factor Of Safety ◽  
Shear Failure ◽  
High Strength ◽  
Concrete Columns ◽  
Reinforced Concrete Columns ◽  
Local Factor ◽  
Shear Span

The size effect on the seismic performance of conventional reinforced concrete columns has been observed in terms of flexural failure and shear failure. Under earthquake loading, slender columns experience flexural failure, and short columns experience flexure-shear failure and shear failure. However, the effect of section size on the seismic performance of high-strength reinforced concrete columns under the conditions of different shear span-to-depth ratios requires further confirmation. For this purpose, six high-strength reinforced concrete columns with shear span-to-depth ratios of 2 and 4 were subjected to cyclic loading in this study. The experimental results indicated that relative nominal flexural strength, energy dissipation coefficient, factor of safety, and local factor of safety all exhibited a strong size effect by decreasing with increasing column size. Furthermore, the size effect became stronger as the shear span-to-depth ratio was increased, except for average energy dissipation coefficient. The observed changes in the factor of safety were in good agreement with the Type 2 size effect model proposed by Bažant. Thus, based on the local factor of safety and Bažant’s Type 2 model, the code equation for moment capacity of different shear span-to-depth ratios was modified to provide a consistent factor of safety regardless of column size.

Experimental Study on Seismic Performance of HRB400 Reinforced Concrete Columns under Cyclic Loading

2011 ◽  
Vol 287-290 ◽  
pp. 703-707
Author(s):  
Yan Han ◽  
Hong Cheng Guan ◽  
Zhen Li
Keyword(s):  
Experimental Study ◽  
Reinforced Concrete ◽  
Seismic Performance ◽  
High Strength ◽  
Concrete Columns ◽  
Reinforced Concrete Columns ◽  
Failure Patterns ◽  
Steel Bar ◽  
Hysteretic Characteristics ◽  
Ductile Behavior

Through experimental study on three HRB400 steel bar reinforced concrete columns subjected to low cyclic reversed loading, the failure patterns, hysteretic curves and skeleton curves were obtained. The influence of longitudinal high-strength reinforcement ratio upon the hysteretic characteristics, ductile behavior and ability of energy dissipation were analyzed. The results show that the main failure pattern was bending failure; and with the increscent of the longitudinal high-strength reinforcing steel bar ratio, the columns can endure larger seismic loads and displacement; the seismic performance of the whole reinforced concrete columns can be effectively improved by arranging reasonable high-strength steel bars.

Experimental and numerical investigations on the size effect of moderate high-strength reinforced concrete columns under small-eccentric compression

2017 ◽  
Vol 27 (5) ◽  
pp. 657-685 ◽  
Author(s):  
Liu Jin ◽  
Zixing Ding ◽  
Dong Li ◽  
Xiuli Du
Keyword(s):  
Compressive Strength ◽  
Reinforced Concrete ◽  
Size Effect ◽  
Compressive Loading ◽  
High Strength ◽  
Concrete Columns ◽  
Failure Behavior ◽  
Reinforced Concrete Columns ◽  
Failure Patterns ◽  
Softening Behavior

The paper deals with an experimental investigation and numerical simulation of moderate high-strength reinforced concrete (RC) columns subjected to a small-eccentric compressive loading ( e0 = 0.25 h0). A series of tests on the behavior of 12 geometrically similar moderate high-strength reinforced concrete columns with two different stirrups ratios (i.e., 0% and 0.66%) were conducted. The maximum structural size of the square reinforced concrete columns was 800 mm. A 2D mesoscale method for the simulation of the behavior of reinforced concrete columns was established. The numerical tests on the reinforced concrete columns with larger stirrup ratios (1.2% and 2.4%) were carried out complementarily, based on the fact that the simulation results were consistent with the available test observations. The failure patterns, the nominal compressive stress–strain relationships, the nominal compressive strength, and the post-peak softening behavior of the reinforced concrete columns were studied. Furthermore, the influence of stirrups on failure behavior and size effect of the reinforced concrete columns was revealed. One can conclude that (1) the size effect exists in the nominal compressive strength of the eccentrically loaded high-strength reinforced concrete columns with the four different stirrup ratios; (2) comparison of the present test results and the “size effect law” proposed by Bažant shows good agreement; (3) the presence of stirrups improves the nominal strengths, makes the failure of columns less brittle, and weakens the size effect; and (4) the proposed mesoscale numerical method is capable of describing the mechanical behavior of eccentrically loaded reinforced concrete columns.

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