High-temperature material degradation of Q345 cold-formed steel during full-range compartment fires

Chen, Wei; Ye, Jihong; Jin, Lei; Jian, Jiang; Liu, Kun; Zhang, Meng; Chen, Wenwen; Zhang, Hua

doi:10.1016/j.jcsr.2020.106366

Cited by 22 publications

(13 citation statements)

References 30 publications

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“…Dimensional properties of the tensile coupon test and mechanical properties are given in Figure and Table , respectively. For coupon tests of cold-formed steel, samples with the cross-section properties of 1.5 mm, 2.5 mm, and 3 mm were prepared and kept at the target temperature of 700 °C for 20 min . After the samples were taken out of the oven, they were kept at room temperature.…”

Section: Resultsmentioning

confidence: 99%

“…A nonlinear three-dimensional finite element (FE) model was constructed to simulate high temperature experimental studies. Elastic modulus and yield strength values of the steel based on the obtained final temperatures have been determined from the study of Chen et al These mechanical properties have been used in the static structural analyses to predict the behavior of the joint producing the moment–rotation ( M –θ) curves and equivalent (von Mises) stresses. The main outcomes of the study are Predicted temperature results of structural steel members (uprights, beams and connector) protected with 1 mm intumescent coating thickness were validated with Eurocode data with a respectable agreement. Fire effect reduces ultimate moment capacity more than 11% and initial stiffness nearly 3% considering original and all-unprotected specimens. Comparing fully protected and unprotected conditions, the joint’s ultimate moment capacity and initial stiffness values increase more than 7%.…”

Section: Discussionmentioning

confidence: 99%

“… with where λ p (W/(m K)) is the thermal conductivity of the fire protection material (intumescent coating), A p / V (m –1 ) is the section factor of the protected steel section, d p (m) is the fire protection thickness, c p (J/(kg K)) and ρ p (kg/m 3 ) are specific heat and density of the protection material, T f (°C) and T st (°C) are the exposed fire temperature (ISO-834) and steel temperature, respectively, and Δ t (s) is the time interval in seconds. The elastic modulus and yield strength values of the material according to the final temperatures determined in the sections were obtained by the study of Chen et al 25 …”

Section: Methodsmentioning

confidence: 99%

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Numerical Investigation of the Fire Behavior of Storage Rack Systems Protected by Intumescent Coating

et al. 2022

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Using a finite element strategy, this study investigates the behavior of beam-to-column connections in storage rack systems exposed to high temperatures. The purpose of this research was to develop moment−rotation (M−θ) curves after painting various structural members with varied configurations in order to evaluate the performance of intumescentcoated beams, uprights, and connectors, which are components of storage rack systems. Within the scope of this work, finite element analyses were carried out in two stages. First, thermal analyses were performed using the transient thermal analysis system of ANSYS Workbench software to estimate the ultimate temperatures of the beam, upright, and connector, which were painted with 1 mm thick paint and exposed to standard (ISO-834) fire. The results were then compared to the Eurocode 3 Part 1.2 with a satisfactory agreement. In the second stage of the analysis, a total of 9 possible alternative models were investigated in the static structural analysis system, reflecting the effect of applying fire protection to the different portions of the rack system. Since the most critical stress level is achieved around the connector tabs, it has been observed that protection of the connector in individual or binary conditions provides higher performance while protection of the beam causes divergent joint behavior. Additionally, comparison of fully protected and unprotected conditions presents an increment of more than 7% on the joint's ultimate moment capacity and initial stiffness, which is an explicit contribution of the intumescent coating to fire resistance.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Numerical Investigation of the Fire Behavior of Storage Rack Systems Protected by Intumescent Coating

et al. 2022

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“…Both Q345 and G550 CFS are used in the experiments, with nominal strengths of 345 and 550 MPa, respectively. The mechanical properties for Q345 and G550 CFS under elevated temperatures were given in previous studies (Chen et al , 2020a, 2020b). To eliminate the effect of eccentric loading for the single-shear specimen and avoid the out-of-plane curling of CFS ply, lips with a width of 6 mm are specially designed; the dimension of the CFS ply is also shown in Figure 1.…”

Section: Test Programmentioning

confidence: 99%

Residual shear capacity of cold-formed steel-to-sheathing screwed connections at elevated temperatures

Liu

Chen

et al. 2021

JSFE

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Purpose Most previous thermal-mechanical modeling of cold-formed steel (CFS) walls did not consider the failure of screwed connections under fire conditions because of the limited data of such connections at elevated temperatures. Design/methodology/approach In this study, 285 steady-state tests are conducted on CFS screwed connections with single-layer gypsum plasterboard (GPB) and Bolivian magnesium board (BMB) sheathing at ambient and elevated temperatures. The failure of these connections is described as the breaking of the loaded sheathing edge. Findings For the BMB sheathing screwed connections, hydrochloric acid gas is generated and released above 300°C, and the shear strength becomes much less than that of the GPB sheathing screwed connection above 370°C. Hence, BMB may not be suitable for use as the face-layer sheathing of CFS walls but is still recommended to replace GPB as the base-layer sheathing. The major influencing parameters on the shear strength of screwed connections are identified as the type of sheathing material and the loaded sheathing edge distance. Originality/value Based on the previous and present test results, a unified expression for the residual shear strength of screwed connections with GPB and BMB is proposed at ambient and elevated temperatures with acceptable accuracy. It can be used as the basic input parameter of the numerical simulation of the CFS structures under fire conditions.

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“…Therefore, the monitoring of wind pressure helps to scientifically predict the safety performance of cables. Because steel structures have temperature-sensitive properties, the analysis of temperature effects is very important in the design and construction of large-span steel structures [28]. Changes in temperature result in temperature stresses and temperature deformations in the structure.…”

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confidence: 99%

Intelligent Discrimination Method Based on Digital Twins for Analyzing Sensitivity of Mechanical Parameters of Prestressed Cables

et al. 2021

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The information collected on large-span prestressed cables by field sensors is susceptible to interference, which leads to inaccurate collection of structural and mechanical parameters of large-span prestressed cables, resulting in misjudgment of structural safety performance. This paper proposes an intelligent judgment method for improving the sensitivity of analyzing mechanical parameters of prestressed cables based on digital twins (DTs). The safety performance of the structure was evaluated by analyzing the mechanical parameters. First, the information during prestressed cable tensioning is dynamically sensed, thereby establishing a multidimensional model of structural analysis. The virtual model is processed by the model modification rule to improve the robustness of the simulation; thus, a DT framework for the sensitivity judgment of the mechanical parameters of the cable is built. In the twin model, the simulation data of the real structure were extracted. Probabilistic analysis was performed using the Dempster–Shafer(D–S) evidence theory to discriminate the sensitivity of mechanical parameters of each cable node under the action of external forces with high accuracy and intelligence. Sensitivity analysis provides a reliable basis for the safety performance assessment of structures. Taking the wheel–spoke-type cable truss as an example, the application of DTs and D–S evidence theory to the sensitivity determination of cable mechanical parameters under temperature fully verified that the proposed intelligent method can effectively evaluate the safety performance of the actual structure.

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High-temperature material degradation of Q345 cold-formed steel during full-range compartment fires

Cited by 22 publications

References 30 publications

Numerical Investigation of the Fire Behavior of Storage Rack Systems Protected by Intumescent Coating

Numerical Investigation of the Fire Behavior of Storage Rack Systems Protected by Intumescent Coating

Residual shear capacity of cold-formed steel-to-sheathing screwed connections at elevated temperatures

Intelligent Discrimination Method Based on Digital Twins for Analyzing Sensitivity of Mechanical Parameters of Prestressed Cables

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