Residual shear strength of reinforced concrete slender beams without transverse reinforcement after elevated temperatures

2021 ◽  
Vol 237 ◽  
pp. 112163
Author(s):  
Subhan Ahmad ◽  
Pradeep Bhargava ◽  
Ajay Chourasia ◽  
Minkwan Ju
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Elevated Temperatures ◽  
Transverse Reinforcement ◽  
Residual Shear Strength ◽  
Slender Beams

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

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Kun Liu ◽  
Wei Chen ◽  
Jihong Ye ◽  
Jian Jiang ◽  
Wenwen Chen ◽  
...  
Keyword(s):  
Shear Strength ◽  
Elevated Temperatures ◽  
Input Parameter ◽  
Single Layer ◽  
Shear Capacity ◽  
Base Layer ◽  
Residual Shear Strength ◽  
Content Type ◽  
Cold Formed Steel ◽  
Fire Conditions

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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