دانلود رایگان مقاله سیستم کنترل ایمنی سازه خرپایی فولادی در آتش – سال 2020
مشخصات مقاله:
عنوان فارسی مقاله:
سیستم کنترل ایمنی سازه خرپایی فولادی در آتش
عنوان انگلیسی مقاله:
Safety monitoring system of steel truss structures in fire
کلمات کلیدی مقاله:
سازه خرپایی فولادی، فروپاشی ناشی از آتش، سیستم نظارت، تأیید تجربی
مناسب برای رشته های دانشگاهی زیر:
مهندسی عمران
مناسب برای گرایش های دانشگاهی زیر:
سازه و زلزله
وضعیت مقاله انگلیسی و ترجمه:
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فهرست مطالب:
Abstract
Graphical abstract
Keywords
1. Introduction
2. Theoretical basis for safety monitoring of steel truss in fire
2.1. Member importance coefficient
2.2. Failure index of truss members
2.3. Collapse index of truss structures in fire
2.4. Calculation procedure of the limit value of steel truss in fire
3. Numerical example
3.1. Numerical model
3.2. Numerical results
4. Development of the monitoring system
4.1. Theoretical framework
4.2. Design of the system
4.3. User interface
5. Experimental verification
5.1. Test program
5.2. Comparison of monitoring and test results
6. Conclusions and expectations
Declaration of Competing Interest
Acknowledgement
References
قسمتی از مقاله انگلیسی:
1. Introduction
According to the data of the World Fire Statistics Center, about 7 million fire accidents happen every year worldwide, and the number of casualties can reach up to about 70,000. Among all kinds of fire accidents, building fire accidents are the most threatening to mankind. Specifically, as steel trusses have widely been used as the roof structures of large-space enclosures, their sudden fire-induced collapses can trap people inside the building, which leads to tremendous losses of human lives and properties. Even worse, without knowing the realtime status of the structure in fire, instructors cannot give the most accurate rescue decision, resulting in secondary casualties. Therefore, a structural safety system in fire, which monitors the real-time structural behavior and predicts the collapse of the structure, is essential for mitigating the hazard caused by building fires. As an essential prerequisite, as well as responding to the concept of the performance-based fire design [1], the global fire-induced collapse behavior of steel structures has dragged the attention of many researchers. Based on the Vulcan software developed by the University of Sheffield, Sun et al. [2,3] obtained the failure modes and corresponding internal force changes of steel frames under single column fires and multi-column fires. Fang et al. [4,5] proposed the evaluation method of the progressive collapse resistance of steel structures with composite floors under localized fire, with and without considering the temperature. Jiang et al. [6,7] studied the progressive collapse mode of planar steel frames under localized fires, and analyzed the dynamic failure mechanism of constrained columns, based on which a simplified evaluation method was proposed. With respect to steel truss roof structures, Lu et al. [8] carried out a case study of the fire behavior of the roof structure of an exhibition center, and some suggestions for enhancing the fire resistance were given. Most recently, Jiang et al. [9] conducted a full-scale fire test on a steel truss roof structure, and detailed failure mode, structural and thermal responses were exhibited, which provided experimental data for verification
