Effect of axial compression ratio on concrete-filled steel tube composite shear wall

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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“…For composite shear walls, the experimental axial compression ratio is given by Hou et al (2019): Frontiers in Materials frontiersin.org…”

Section: Determination Of Axial Compression Ratiomentioning

confidence: 99%

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 horizontal and longitudinal rebar distribution in the precast wall panel is 8@200.On the top of the shear wall, there is a loaded beam with a section size of 200 mm×400 mm, which is cast in whole with the precast shear wall. The length, width and height of the foundation beam are 2600 mm, 550 mm and 500 mm respectively [37,38]. A 300 mm low wall is turned over on the foundation beam and connected to the prefabricated shear wall at this point.…”

Section: Specimen Designmentioning

confidence: 99%

An exhaustive research and analysis on seismic performance of prefabricated concrete shear wall structure

Chen¹,

Poongodi²

2020

J. vibroeng.

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In order to accelerate the process of building industrialization, improve the overall stability and construction quality of the building. In this paper, a bolted connection method is designed to study the seismic performance of the composite concrete shear wall specimens with horizontal split joints from the aspects of bearing capacity, ductility, energy dissipation, deformation capacity and failure mode. The test results show that the bolted concrete shear wall is feasible and the connectors can effectively connect the upper and lower precast shear walls to form a whole with certain lateral stiffness. The energy dissipation capacity of the specimens is similar to that of other prefabricated concrete shear wall structures with “self-reduction”. The displacement Angle is greater than 1/120 of the limit value of the displacement Angle between elastic-plastic layers under the action of large earthquakes, and the specimen has good deformation capacity. The energy dissipation capacity of the structure from dynamics perspective reveals that smaller capacity of the specimen by providing energy dissipation factor E= 0.24 and equivalent viscous damping coefficient of 0.038.

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“…[ 1,2 ] Recently, prefabricated RC shear walls (PRCSWs) have been widely studied and applied in practice due to the advantages of less on‐site wet operation, faster construction speed, higher construction quality and better sustainability. [ 3 ] But their integrity is much lower than traditional cast‐in‐place RC shear walls (CRCSWs) due to the weakening of the assembly joints. Fortunately, in the PRCSWs, a semi‐precast wall composed of the precast concrete and cast‐in‐place concrete layers (as shown in Figure 1), known as superimposed RC shear wall (SRCSW), can well exhibit the advantages of PRCSWs while bringing its integrity closer to CRCSWs.…”

Section: Introductionmentioning

confidence: 99%

Seismic behavior of superimposed reinforced concrete shear walls with X‐shaped steel plate bracings under different axial load ratios

Wang

Guo

2021

Structural Design Tall Build

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Summary In order to improve the seismic performance of traditional superimposed reinforced concrete shear walls, a kind of superimposed reinforced concrete shear wall with X‐shaped steel plate bracings (labeled as SRCXSW) was proposed in this paper. And seismic behaviors of three 1/2‐scale shear walls including two SRCXSWs with different axial load ratios (ALRs) and one cast‐in‐place reinforced concrete shear wall with X‐shaped steel plate bracings (labeled as CRCXSW) were investigated by the quasi‐static loading test. Experimental results indicated that SRCXSW and CRCXSW with the same ALR exhibited the similar seismic behaviors, different ALRs applied in SRCXSW greatly affected the seismic behaviors in terms of load‐bearing capacity, deformation, lateral stiffness, and energy dissipation capacity and slightly affected the failure mode and cooperative mechanism between the precast and cast‐in‐place concrete layers. In particular, a high ALR applied on SRCXSW had little effect on the stiffness degradation before yielding, but accelerated the post‐yield stiffness degradation. Then, based on the discussion conclusion about the contribution of three mechanisms to the load‐bearing capacity varying with aspect ratio, a modified strut‐and‐tie model for predicting the maximum strength of specimens was proposed, and good predictive ability under different ALRs was verified by experimental and finite element analysis (FEA) results. Besides, FEA based on OpenSees was implemented to further investigate the effect of critical parameters, FEA results showed that ALR and longitudinal reinforcement ratio in boundary element had a significant influence on the load‐bearing capacity and deformation capacity of SRCXSW. And a higher volumetric ratio of X‐shaped steel plate bracings and longitudinal reinforcement ratio in boundary element led to a greater load‐bearing capacity but their contribution decrease with the increase of ALR.

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Effect of axial compression ratio on concrete-filled steel tube composite shear wall

Cited by 16 publications

References 16 publications

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

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

An exhaustive research and analysis on seismic performance of prefabricated concrete shear wall structure

Seismic behavior of superimposed reinforced concrete shear walls with X‐shaped steel plate bracings under different axial load ratios

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