Experimental study on the seismic behavior of RC shear walls after freeze-thaw damage

Rong, Xian‒Liang; Zheng, Shansuo; Zhang, Y.; Zhang, Xiaoyu; Li, Dong

doi:10.1016/j.engstruct.2019.110101

Cited by 34 publications

(21 citation statements)

References 21 publications

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“…It has been shown that the frost action would cause uneven damage from the surface to the interior of the concrete members. After the concrete cover is frozen, the damage rate of the member will be accelerated, which was confirmed through the relative compressive strength results of the concrete [34]. The time of collecting data by Peng et al [46] is short.…”

Section: Discussion On Test Limitation and Further Researchmentioning

confidence: 92%

“…There are many differences between the actual exposure and laboratory freeze-thaw conditions, such as cooling and heating rate, temperature range, the time of the freezing period, and conditions of concrete members exposure [10,34]. Peng et al [46] has collected the data of Shisanling power station for 3 years and established the conversion formula of the number of FTCs between the actual exposure conditions and test conditions (N test = 12N actual ) on the basis of the principle that the reduction value of the dynamic elastic modulus of the test and the actual is equal.…”

Section: Discussion On Test Limitation and Further Researchmentioning

confidence: 99%

“…Based on the comparison of Fig. 11b, c, e, it can be seen that with the rising concrete strength, the residual deformation and the hysteresis loop width [34] under the same applied load level started to increase. The length of the yield platform tended to increase, and the pinched hysteretic behavior started to decrease.…”

Section: Cyclic Behavior and Failure Modesmentioning

confidence: 93%

“…Forty-two days after the second casting, the pseudo-static loading of each designed squat RC shear wall specimen was performed with the cantilever beam loading method [34], and the cantilever test setup and the wall prior to cyclic loading are shown in Fig. 5 [35].…”

Section: Detailed Loading Scheme and Displacement Test Point Arrangementmentioning

confidence: 99%

“…After cracking, the number of horizontal cracks decreased, while the spacing and width of the cracks raised. This phenomenon mainly occurred since the frost action weakened the bond strength [12,13], which increased the required transmission length as the stress in the reinforcement was transferred into the concrete by the bond stress, resulting in an increase in the spacing of the cracks [34,39]. When failure appeared, the damage degree of the squat RC shear wall increased, the width of the primary shear crack rose, and the particle size of the crushed concrete fell, i.e., the concrete tended to be loose after FTCs, which is consistent with the results of the SEM analyses.…”

Section: Cyclic Behavior and Failure Modesmentioning

confidence: 99%

See 4 more Smart Citations

Seismic behavior of frost-damaged squat RC shear walls under artificial climate environment: a further experimental research

Rong

Zheng

Zhang

et al. 2020

Archiv.Civ.Mech.Eng

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In cold environment, the damage of freezing and thawing poses a great threat to the safety of concrete structures. In this study, six frost-damaged squat reinforced concrete (RC) shear walls were subjected to low cyclic reversal loading to investigate the effects of axial compression ratio, concrete strength and freeze-thaw cycles (FTCs) on the seismic performance of squat RC shear walls. The seismic behavior of the test specimens was evaluated in terms of the frost action at the microstructure level, frost-heave crack patterns, damage processes, failure patterns, hysteretic behaviors, skeleton curves, deformations, and energy dissipation capacities. It shows that the boundary elements and distributed reinforcements had obvious restraining effects on the development of frost-heave cracks. The FTC action weakened the load-carrying capacity, energy dissipation capacity, and shear resistance capacity of the walls. When the number of FTCs is kept at 200, with the increase of the concrete strength, the gel structure (C-S-H) gradually evolved from fibrous to nets, also the width and number of frost-heave cracks started to reduce, and the distribution of frost-heave cracks evolved from the middle of the specimen to the perimeter. Moreover, the energy dissipation capacity and the ratio of the shear displacement on the whole displacement after cracking loading condition started to increase.

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Section: Discussion On Test Limitation and Further Researchmentioning

confidence: 92%

Section: Discussion On Test Limitation and Further Researchmentioning

confidence: 99%

Section: Cyclic Behavior and Failure Modesmentioning

confidence: 93%

Section: Detailed Loading Scheme and Displacement Test Point Arrangementmentioning

confidence: 99%

Section: Cyclic Behavior and Failure Modesmentioning

confidence: 99%

See 3 more Smart Citations

Seismic behavior of frost-damaged squat RC shear walls under artificial climate environment: a further experimental research

Rong

Zheng

Zhang

et al. 2020

Archiv.Civ.Mech.Eng

Self Cite

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Correlation analysis of pore structure and frost resistance of carbon nanotube concrete based on gray relational theory

Song

Niu

Kong

2023

Structural Concrete

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In order to explore the micro‐pore structure improvement mechanism of multi‐walled carbon nanotubes (MWCNT) on the frost resistance of concrete, five kinds of MWCNT concrete with different contents were prepared and the frost resistance test and mercury intrusion test were carried out. The results show that when the content of MWCNT is 0.1 wt%, the mass loss rate and compressive strength loss rate of concrete after freezing and thawing are 15.97% and 23.85% lower than that of ordinary concrete, respectively, indicating that this content is best amount to improve the frost resistance of concrete in this study. Moreover, 0.1 wt% MWCNT can significantly optimize the internal pore structure of concrete, and the average pore diameter growth rate and harmful pore ratio are 30.1% and 64.45%, respectively, after 200 freeze–thaw cycles. The proportion of more harmful pores has the greatest influence on compressive strength and relative elastic modulus, and the gray correlation degree is more than 0.8. Finally, the mathematical models of compressive strength‐pore parameters and relative dynamic elastic modulus‐pore parameters of MWCNT concrete after freeze–thaw cycle are established considering pore structure parameters and pore size distribution.

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Experimental evaluation of cyclic behavior of precast concrete frame with steel shear wall

Koopaizadeh,

Behnamfar,

Tafti

2024

Structural Design Tall Build

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This study seeks to integrate steel shear walls with precast concrete systems into stable and resistant structures against lateral loads. It is desired to study the ductility factor, lateral strength, and behavior as well as the energy absorption of this integrated system compared to the precast concrete frame without a shear wall. For this purpose, two steel shear wall samples made of mild steel and galvanized steel plates are constructed within a precast concrete frame. The assembly is tested under a cyclic lateral load. The integrity of the connections of steel strips of the wall together, and the boundary of the wall to the frame, is observed to be excellent. The main failure mode is composed of the diagonal yielding of the steel wall. The system benefits from large hysteresis loops and no degradation because of any instability. The beam‐column connections remain almost intact even at large cycles of deformation. Moreover, a bare precast concrete frame is tested in the same way to compare the lateral behavior. The utilized ductile beam‐column connections are successful in retaining the integrity of the system until large drifts. However, the seismic design characteristics of the bare frame turn out to be inferior to the steel shear wall system. Results of the cyclic tests show that by proper design of the interior and exterior connections of the shear wall as well as the beam‐column connections, the steel shear wall system can largely increase the stiffness, ultimate strength, and energy dissipation capacity of a bare precast moment resisting reinforced concrete frame. On top of that, the system is able to retain its integrity up to lateral drifts over 2%.

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Experimental study on the seismic behavior of RC shear walls after freeze-thaw damage

Cited by 34 publications

References 21 publications

Seismic behavior of frost-damaged squat RC shear walls under artificial climate environment: a further experimental research

Seismic behavior of frost-damaged squat RC shear walls under artificial climate environment: a further experimental research

Correlation analysis of pore structure and frost resistance of carbon nanotube concrete based on gray relational theory

Experimental evaluation of cyclic behavior of precast concrete frame with steel shear wall

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