Experimental Studies of Seismic Performance of Precast Concrete Columns with High-strength and Conventional Steel Rebar

2018 ◽  
Author(s):  
Weiding Zhuo ◽  
Zhao Liu ◽  
Teng Tong
Keyword(s):  
Seismic Performance ◽  
Precast Concrete ◽  
Experimental Studies ◽  
High Strength ◽  
Concrete Columns ◽  
Conventional Steel ◽  
Steel Rebar

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.

scholarly journals Research and Development Status of Grouted Splice Sleeve in Precast Concrete Structure

2018 ◽  
Vol 38 ◽  
pp. 03034
Author(s):  
Ying Chang Wu ◽  
Liu Peng Sheng ◽  
Wei Jian Zhao
Keyword(s):  
Research And Development ◽  
Construction Industry ◽  
Seismic Performance ◽  
Concrete Structure ◽  
Precast Concrete ◽  
High Strength ◽  
Development Status ◽  
Existing Problems ◽  
Green Development ◽  
Key Technologies

The development of precast concrete structure is an effective way to promote industrialization of construction industry and housing industrialization, and is also a inevitable choice for green development. Grouted splice sleeve connector, regarded as one of the key technologies of precast concrete structure, has the advantages of high strength and good seismic performance. In this paper, the development of grouted splice sleeve connector is systematically summarized both home and abroad, existing problems in the domestic research of sleeve are evaluated and analyzed, and corresponding countermeasures are also further proposed.

scholarly journals Experimental Study on Seismic Behavior of Precast Frame Columns with Vertical Reinforcement Spliced with Grouted Sleeve Lapping Connectors

2021 ◽  
Vol 2021 ◽  
pp. 1-21
Author(s):  
Qiong Yu ◽  
Liang Zhang ◽  
Shaohua Bai ◽  
Baoxiu Fan ◽  
Zhenhai Chen ◽  
...  
Keyword(s):  
Seismic Performance ◽  
Failure Modes ◽  
Precast Concrete ◽  
Hysteresis Loops ◽  
Concrete Columns ◽  
Type I ◽  
Type Ii ◽  
Force Transfer ◽  
Steel Sleeve

Grouted splice connector is widely employed in precast concrete structures, but its utilization is still limited by shortcomings such as high construction cost, inconvenience in assemblage, and uncompacted grout caused by its small sleeve diameter. The grouted sleeve lapping connectors proposed by the authors can not only provide reasonable force transfer and convenient construction processing but also have the characteristics of low price and easy grouting. In this paper, the seismic performance of two full-scale precast concrete columns with two types of grouted sleeve lapping connectors was investigated, where type-I connector connected two lapped rebars and type-II connector connected four lapped rebars by a steel sleeve, respectively. A cast-in-situ column was also tested as a reference. All the specimens were tested under reversed cyclic horizontal load with a constant axial force. The distribution of cracks, failure modes, loading capacities, deformation abilities, stiffness, ductility, hysteresis loops, and energy dissipation of the specimens were studied. The type-I and type-II grouted sleeve lapping connectors satisfactorily transferred the stress of rebars when the columns reached their ultimate loads, and the seismic performance of the precast concrete columns was found to be comparable to that of the cast-in-situ column. Thus, the grouted sleeve lapping connector has a potential to replace the grouted splice connector in cast-in-situ connection.

Seismic performance of high-strength concrete columns

2005 ◽  
Vol 57 (5) ◽  
pp. 247-260
Author(s):  
S.-K. Hwang ◽  
H.-D. Yun ◽  
W.-S. Park ◽  
B.-C. Han
Keyword(s):  
Seismic Performance ◽  
High Strength Concrete ◽  
High Strength ◽  
Concrete Columns ◽  
Strength Concrete ◽  
High Strength Concrete Columns

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.

scholarly journals Effect of silica fume and lateral confinement on fire endurance of high strength concrete columns

2006 ◽  
Vol 33 (1) ◽  
pp. 93-102 ◽  
Author(s):  
V K.R Kodur ◽  
R McGrath
Keyword(s):  
Silica Fume ◽  
Fire Resistance ◽  
High Strength Concrete ◽  
Elevated Temperatures ◽  
Experimental Studies ◽  
High Strength ◽  
Concrete Columns ◽  
Main Concern ◽  
Strength Concrete ◽  
Fire Endurance

Fire represents one of the most severe environmental conditions, and therefore should be properly accounted for in the design of structural members. The increased use of high strength concrete (HSC) in buildings has raised concerns regarding the behaviour of such concrete in fire. In particular, spalling at elevated temperatures, as identified in studies by a number of laboratories, is a main concern. In this paper, results from experimental studies on the fire resistance of HSC columns are presented. A comparison is made of the fire resistance performance of HSC columns with and without silica fume and with different confinement configurations. The effect of silica fume and the effect of confinement on the fire performance of HSC columns will be discussed. The results show that the fire endurance of HSC columns with higher silica fume content is lower and the reduced tie spacing and the provision of cross-ties are beneficial in minimizing the spalling in HSC.Key words: fire resistance, high strength concrete, reinforced concrete columns, spalling.

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