کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
11000879 1428213 2018 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
On reliable predicting risk and nature of thermal spalling in heated concrete
ترجمه فارسی عنوان
در مورد پیش بینی خطر و طبیعت ضایعات حرارتی در بتن داغ قابل پیش بینی است
کلمات کلیدی
افتادگی حرارتی، بتن گرم شده، شبیه سازی عددی، تجزیه و تحلیل انرژی، مکانیک رسانه متخلخل،
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی
Thermal spalling is a deterioration phenomenon which is of fundamental importance during durability analysis of concrete structures exposed to high temperature, e.g. during a fire. To assess the risk of this damage mechanism for a real concrete structure, numerical simulations are usually applied since experimental tests are very costly. Some aspects related to predicting thermal spalling by means of numerical modelling of chemo-hygro-thermal and damage processes in heated concrete, are presented in this work. First, we propose a spalling index, validate it with some experimental results and show how it can be used in the quantitative assessment of spalling risk. Then, the results of numerical simulations of a slab, made of two types of concrete (NSC and HPC), heated with three different rates, are discussed from the energetic point of view in order to indicate the main physical causes and predict the nature of thermal spalling: slow, rapid or violent. The presented results allow to assess the contribution of energy due to constrained thermal strains and compressed pore gas into the thermal spalling for different types of concrete heated with different rates.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Archives of Civil and Mechanical Engineering - Volume 18, Issue 4, September 2018, Pages 1219-1227
نویسندگان
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