Experimental research on the behaviour of eccentrically loaded SRC columns subjected to the ISO-834 standard fire including a cooling phase

Zhang, Chao; Wang, Guangyong; Xue, Songtao; Yu, Huimin

doi:10.1007/s13296-016-6014-0

Cited by 12 publications

(4 citation statements)

References 19 publications

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“…Therefore, the mechanical properties of SRC columns after exposure to high temperature have also attracted the attention of many experts and scholars. Zhang et al [21], Meng et al [22], Han et al [23,24], Chen et al [25] and Liu et al [26] investigated the behavior of square section steelconcrete composite columns after fire, revealed the relationship between temperature distribution and load-displacement. In addition, the effects of fire time, steel content, and other parameters that can influence the residual bearing capacity of columns were also considered.…”

Section: Introductionmentioning

confidence: 99%

Post-Fire Behavior of Cross-Shaped Steel Reinforced Concrete Columns: Simulation and Analytical Expressions

2023

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In order to explore the behavior of cross-shaped steel reinforced concrete (SRC) columns after fire, the heat transfer analysis model and structural analysis model were established by ABAQUS software. The simulation results of the cross-shaped column were compared with the existing test results, in the aspect of the temperature distribution, time-temperature curve, failure mode, and load-displacement relationship after fire exposure. The results show that the simulation results agree well with the experimental results. The influence of critical parameters on residual bearing capacity coefficient k was discussed, which including constant heating duration, maximum heating temperature, concrete strength, yield strength of section steel, yield strength of rebars, limb thickness, effective column length, rebar diameter, and steel content. Finally, a simplified formula was proposed to calculate the residual bearing capacity of cross-shaped SRC columns after fire.

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Section: Introductionmentioning

confidence: 99%

Post-Fire Behavior of Cross-Shaped Steel Reinforced Concrete Columns: Simulation and Analytical Expressions

2023

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“…The purpose of optimization design is to gain the optimal model that meets both the minimum amount of steel and the maximum stiffness of structures. At present, structural optimization methods mainly have Genetic Algorithm (GA) (Zhang and Sun, 2017;Liang et al, 2016), Ant Colony Algorithm (ACO) (Guan et al, 2021;Chen et al, 2020a), Simulated Annealing Algorithm (SAA) (Zhang et al, 2016), particle swarm optimization algorithm (Chen et al, 2020b;Yildiz and Lesieutre, 2020) and gradient-based optimization method (Yuan and Zhu, 2021), Finite Element Optimization Algorithm , and so on. Genetic Algorithm (GA) based on natural genetics which can handle discrete variables with ease has emerged and spread, some papers have been published on structural optimization of space structures, cable-truss structures and steel structures using GA in Adeli and Cheng (1994).…”

Section: Introductionmentioning

confidence: 99%

“…, 2016), Ant Colony Algorithm (ACO) (Guan et al , 2021; Chen et al. , 2020a), Simulated Annealing Algorithm (SAA) (Zhang et al. , 2016), particle swarm optimization algorithm (Chen et al , 2020b; Yildiz and Lesieutre, 2020) and gradient-based optimization method (Yuan and Zhu, 2021), Finite Element Optimization Algorithm (Zhang and Zhang, 2017), and so on.…”

Section: Introductionmentioning

confidence: 99%

Simplification and further optimization of spatial cable-truss structure without inner ring cables

Lü

Xue

Liu

et al. 2022

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PurposeIn order to optimize SCSWIRC, the simplification and further optimization method is proposed. SCSWIRC's optimization includes two levels. The first level refers to simplifying structural system from the perspective of components; the second level refers to optimizing components' sectional areas from the perspective of mechanics. The first level aims to remove redundant components, and the second level aims to reduce structural self-weight based on the first level. The purpose of the paper is to simplify SCSWIRC's structural system and optimize structural self-weight and reduce construction forming difficulty.Design/methodology/approachGrid-jumping layout and multi-objective optimization method is used to simplify and further optimize Spatial cable-truss structure without inner ring cables (SCSWIRC). Grid-jumping layout is used to simplify remove redundant components, and multi-objective optimization method is used to reduce structural self-weight. The detailed solving process is given based on grid-jumping layout and multi-objective optimization method.FindingsTake SCSWIRC with a span of 100m as an example to verify the feasibility and correctness of the simplification and further optimization method. The optimization results show that 12 redundant components are removed and the self-weight reduces by 3.128t from original scheme to grid-jumping layout scheme 1. The self-weight reduces from 36.007t to 28.231t and feasible coefficient decreases from 1.0 to 0.627 from grid-jumping layout scheme 1 to multi-objective optimization scheme. The simplification and further optimization can not only remove the redundant components and simplify structural system to reduce construction forming difficulty, but also optimize structural self-weight under considering structural stiffness to reduce project costs.Originality/valueThe proposed method firstly simplifies SCSWIRC and then optimizes the simplified SCSWIRC, which can solve the optimization problem from the perspective of components and mechanics. Meanwhile, the optimal section solving method can be used to obtain circular steel tube size with the optimal stiffness of the same areas. The proposed method successfully solves the problem of construction forming and project cost, which promotes the application of SCSWIRC in practical engineering.

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“…Zhang et al [23] conducted an experimental investigation and identified that failure of SRC columns could occur during the cooling down phase. The studies dealing with the numerical modelling of structures exposed to natural fires and the post-fire residual capacity are available, but they mostly focus on CFST columns [24]- [32], concrete-filled double-skin tube columns [33] and concrete-encased CFST columns [34]- [35].…”

Section: Introductionmentioning

confidence: 99%

Performance of steel reinforced concrete columns after exposure to fire: Numerical analysis and application

Han

Zhou

Tan

et al. 2020

Engineering Structures

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One advantage of steel reinforced concrete (SRC) columns is that the concrete encasement reduces the maximum temperature attained by the steel section in the full-range fire situation. For fire-exposed SRC columns, a better understanding of their post-fire performance can facilitate their rehabilitation and re-use. This paper presents a numerical study into the post-fire performance of SRC columns. Results show that an SRC column of 600600 mm in cross-section retained 0.87 times of the original load-bearing capacity after exposure to full-range fire with a heating duration of 45 min and a subsequent linear cooling down phase of 139 min. After the SRC column fully cooled down to ambient temperature, the proportion of load carried by the steel section increased to 73%, significantly higher than the level at ambient temperature (20%). Results of the parametric study revealed that a number of factors, i.e., duration of fire exposure, cross-sectional size, slenderness ratio and concrete strength, significantly affected the post-fire residual strength. The numerical method was applied to the post-fire assessment of the SRC columns in a fire-exposed building and a case study is presented. The resistance of the SRC column to compression reduced by 4% after fire exposure. By using the proposed repair method, the resistance to compression can be recovered by 11% compared to that before fire exposure.

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Experimental research on the behaviour of eccentrically loaded SRC columns subjected to the ISO-834 standard fire including a cooling phase

Cited by 12 publications

References 19 publications

Post-Fire Behavior of Cross-Shaped Steel Reinforced Concrete Columns: Simulation and Analytical Expressions

Post-Fire Behavior of Cross-Shaped Steel Reinforced Concrete Columns: Simulation and Analytical Expressions

Simplification and further optimization of spatial cable-truss structure without inner ring cables

Performance of steel reinforced concrete columns after exposure to fire: Numerical analysis and application

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