Fire Resistance and Post-fire Seismic Behavior of High Strength Concrete Shear Walls

Xiao, Jianzhuang; Xie, Qinghai; Li, Zhiwei; Wang, Wan

doi:10.1007/s10694-016-0582-6

Cited by 16 publications

(5 citation statements)

References 34 publications

(43 reference statements)

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“…The mean residual cube and prism compressive strengths of HSC were reduced by 81.07 and 81.87% compared with those at ambient temperature, respectively. The comprehensive influence of the hydrate decomposition 27,28 and micro‐crack appearance caused by the pore pressure of the water evaporation 29,30 as well as the thermal incompatibility between the aggregate grain and the mortar 31 led to the strength reduction.…”

Section: Variability Of Hsc Compressive Strengthmentioning

confidence: 99%

Reliability analysis of the residual moment capacity of high‐strength concrete beams after elevated temperatures

Xie

2020

Structural Concrete

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A series of tests were conducted to study the variability of the residual compressive strength for high‐strength concrete (HSC) after elevated temperatures, and then a calculation process was developed to study the reliability of the residual moment capacity of HSC beams after a fire. The experimental results indicated that the mean values and the characteristic values of the residual compressive strength of HSC were reduced with the increasing elevated temperatures. The standard deviation of the residual compressive strength of HSC was increased when the temperature ranged from 20 to 400°C and decreased from 400 to 800°C. Regardless of the elevated temperatures, the residual compressive strength of HSC followed the normal distribution. The reliability index of the residual moment capacity of HSC beam was decreased with the increasing fire duration. The decrease rate of the reliability index became lower and kept constant when the section height–width ratio was beyond 2.75 and the longitudinal reinforcement ratio was higher than 1.43%. As the load effect ratio was increased, the decrease rate of the reliability index was reduced regardless of the section size, the height–width ratio, and the reinforcement ratio.

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Section: Variability Of Hsc Compressive Strengthmentioning

confidence: 99%

Reliability analysis of the residual moment capacity of high‐strength concrete beams after elevated temperatures

Xie

2020

Structural Concrete

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“…Previous investigations (Go et al, 2012;Hertz, 2018) showed that reinforced lightweight aggregate concrete walls outperformed reinforced normal weight concrete walls in terms of basic mechanical properties such as ultimate load, yield load and stiffness. In other experimental studies (Ngo et al, 2013;Xiao et al, 2017;Nguyen et al, 2018) on high-strength concrete walls exposed to fire, the results showed that high-strength concrete spalled more severely when exposed to fire compared to normalstrength concrete.…”

Section: Introductionmentioning

confidence: 84%

Fire resistance of composite shear walls filled with demolished concrete lumps and self-compacting concrete

Xiong

Chen²,

Wu³

et al. 2022

Front. Mater.

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The recycling and reuse of waste concrete is conducive to promoting the sustainable development of resources and practicing the concept of green development. Demolished concrete lumps (DCLs) and self-compacting concrete (SCC) made from waste concrete take full advantage of their recyclability. In order to fully utilize the advantages of demolished concrete lumps and self-compacting concrete in construction, applying demolished concrete lumps and self-compacting concrete to composite shear wall structures is an effective way to reduce costs and improve industrial production. In this paper, a new composite shear wall filled with demolished concrete lumps and self-compacting concrete is proposed, and its fire performance is investigated. The shear wall combines edge constraints of concrete-filled steel tubes, demolished concrete lumps and self-compacting concrete. In order to facilitate the mass pouring of demolished concrete lumps, a cavity is formed between the steel tubes at the ends and the precast walls on both sides. A double-sided fire tests was conducted on three composite shear wall specimens filled with demolished concrete lumps and self-compacting concrete at a constant axial compression ratio, where the fire-retardant coating and the wall width-to-depth ratio were considered as the main test parameters. The specimens were able to steadily withstand the predetermined axial loads during the fire resistance time of 180 min and showed good fire resistance. The concrete temperature variation trends of the three specimens in the wall section were basically the same. The fire-retardant coating on the concealed column had a significant effect on the section temperature of the steel tube, while increasing the wall width-to-depth ratio had little effect. When the axial compression ratio was 0.19, the specimens were in the expansion stage within 180 min and no compression occurred. The results show that the expansion deformation of the shear wall sprayed with fire-retardant coating on the outer surface of the concealed column is smaller than that of the shear wall without fire-retardant coating, and the axial deformation of the composite shear wall infilled with demolished concrete lumps and self-compacting concrete is not affected by increasing the wall width-to-depth ratio.

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“…However, earthquake is also a credible hazard for the remaining lifespan of structures in seismic zones that may be repaired and reused after an accidental fire event. Currently there is no design guidance in this direction and only few experimental [19][20][21][22][23] and numerical [24][25][26] studies are available regarding the seismic/cyclic performance of fire-exposed RC structures.…”

Section: Introductionmentioning

confidence: 99%

Cyclic behaviour of as-built and strengthened existing reinforced concrete columns previously damaged by fire

Melo

Triantafyllidis

Rush

et al. 2022

Engineering Structures

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Fire Resistance and Post-fire Seismic Behavior of High Strength Concrete Shear Walls

Cited by 16 publications

References 34 publications

Reliability analysis of the residual moment capacity of high‐strength concrete beams after elevated temperatures

Reliability analysis of the residual moment capacity of high‐strength concrete beams after elevated temperatures

Fire resistance of composite shear walls filled with demolished concrete lumps and self-compacting concrete

Cyclic behaviour of as-built and strengthened existing reinforced concrete columns previously damaged by fire

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