Bending working law of corroded ductile iron pipe flange connections revealed by structural stressing state theory

Jin, Zhen; Qi, Wang; Gong, Yanfa; Zhang, Yannian; Zhou, Guangchun

doi:10.1016/j.ijpvp.2022.104717

Cited by 1 publication

(1 citation statement)

References 16 publications

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“…This new theory and the corresponding analysis methods can reveal the failure starting point and the elastoplastic branching point in the stressing state evolution of a structure under a full loading process. Since this theory was established, it has achieved many research results, for instance, both failure starting points and elastoplastic branching points existing in experimental and simulative data were presented through the stressing state analysis of structures such as large curvature steel box beams [30], spiral confined short columns [31], corroded and non-corroded pipe joints [32,33], as well as the mechanical state transformation during the progressive collapse process of steel frame structures [34]. These results provided new references for structural design and safety assessment.…”

Section: Introductionmentioning

confidence: 99%

Essential Load-bearing Characteristics of Steel-concrete Composite Floor System in Fire Revealed by Structural Stressing State Theory

Zhang,

Qi,

Wang

et al. 2024

Preprint

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This study reveals the essential load-bearing characteristics of the steel-concrete composite floor system under fire conditions applying structural stressing state theory. Firstly, the strain data in the entire process of the fire test are modeled as state variables which can present the slab’s stressing state evolution characteristics; Then, the state variables are used to build the stressing state mode and the parameter characterizing the mode. Further, the Mann-Kendall criterion is adopted to detect the leap points in the evolution curves of the characteristic parameters during the entire fire exposure process. Also, the evolution curves of the stressing state modes are investigated to verify the leap profiles around the leap/characteristic points; Finally, the detected leap points are defined as the failure starting points and elastoplastic branching points, which is unseen in the past researches focusing on the failure endpoint defined at the ultimate load-bearing state of the composite floor system. The failure starting point and the elastoplastic branching point are the embodiment of natural law from quantitative change to quality change of a system rather than an empirical and statistical judgment. Hence, both characteristic points avoidably exist in the strain data of the composite floor system undergoing the fire process, which can be revealed through the proper modeling methods and update the existing theories and methods on structural analysis and design in fire.

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