Retrofitting reinforced concrete one–way damaged slabs exposed to high temperature

Other Title(s)

إعادة تأهيل البلاطات باتجاه واحد الخرسانية المسلحة المتضررة المعرضة إلى درجات حرارية عالية

Joint Authors

Izzat, Amir Faruq
Abbas, Shirin Awwad
Farhan, Jamal Abd al-Wahid

Source

Journal of Engineering

Issue

Vol. 19, Issue 7 (31 Jul. 2013), pp.845-862, 18 p.

Publisher

University of Baghdad College of Engineering

Publication Date

2013-07-31

Country of Publication

Iraq

No. of Pages

18

Main Subjects

Civil Engineering

Topics

Abstract AR

أصبحت دراسة أنظمة اكتشاف الاختراقات من الثوابت المهمة في أمنية الشبكات.

حالما يكشف نظام الاختراقات أي هجوم، فانه يقوم بتوليد مجموعة من التحذيرات التي تشير وجود خرق أمني في الشبكة.

برنامج Snort المفتوح المصدر هو أحد أنظمة اكتشاف الاختراقات المجانية و لكنه يعاني من مشكلة البطء نسبيا إذا ما تم استخدامه مع الشبكات السريعة.

لحل هذه المشكلة، نقترح استخدام عدة نسخ من برنامج Snort مع مصنف حزم.

كل نسخة من هذا البرنامج تحتوي على جزء من المجموعة الكلية للهجومات المراد مراقبتها.

أما دور مصنف الحزم فهو توزيع الحزم على النسخ المستخدمة من برنامج Snort وكذلك لضمان عدم إرسال الحزم الخاصة بهجوم واحد إلى أكثر من نسخة من برنامج Snort وبالتالي تجنب الاكتشاف.

النتائج العملية مع بيانات DARPA 1999 بينت أن كفاءة البرنامج Snort قد تحسنت بنسبة 30 %.

Abstract EN

Exposure of reinforced concrete buildings to an accidental fire may result in cracking and loss in the bearing capacity of their major components, columns, beams, and slabs.

It is a challenge for structural engineers to develop efficient retrofitting techniques that enable RC slabs to restore their structural integrity, after being exposed to intense fires for a long period of time.

Experimental investigation was carried out on twenty one slab specimens made of self compacting concrete, eighteen of them are retrofitted with CFRP sheets after burning and loading till failure while three of them (which represent control specimens) are retrofitted with CFRP sheet after loading till failure without burning.

All slabs had been tested in a simply supported span and subjected to two-point loading.

The main variables were the effect of different temperature levels (300ºC, 500ºC and 700ºC), different concrete compressive strength (20MPa, 30MPa and 40MPa) and cooling rate (gradually and sudden cooling conditions) on the behavior of retrofitted one way slabs .The structural response of each slab specimen was investigated in terms of load-deflection behavior, ultimate load carrying capacity and mode of failure.

The experimental results, generally, indicate that slabs retrofitted using CFRP sheets restored flexural strength values nearly equal to or lower than those of the reference slabs, the retrofitted slabs exhibited larger deflection than the control slabs at ultimate loads.

Retrofitted control slabs after loading regained about 93.95% to 97.92% of their original load capacity (before retrofitting) while the other slabs regained from 42.% to 84% of the load capacity of the original control specimens.

Most of the tested slabs failed by concrete crushing at mid span and partial debonding of certain retrofitting systems was also observed for a few cases.

American Psychological Association (APA)

Abbas, Shirin Awwad& Izzat, Amir Faruq& Farhan, Jamal Abd al-Wahid. 2013. Retrofitting reinforced concrete one–way damaged slabs exposed to high temperature. Journal of Engineering،Vol. 19, no. 7, pp.845-862.
https://search.emarefa.net/detail/BIM-336126

Modern Language Association (MLA)

Abbas, Shirin Awwad…[et al.]. Retrofitting reinforced concrete one–way damaged slabs exposed to high temperature. Journal of Engineering Vol. 19, no. 7 (Jul. 2013), pp.845-862.
https://search.emarefa.net/detail/BIM-336126

American Medical Association (AMA)

Abbas, Shirin Awwad& Izzat, Amir Faruq& Farhan, Jamal Abd al-Wahid. Retrofitting reinforced concrete one–way damaged slabs exposed to high temperature. Journal of Engineering. 2013. Vol. 19, no. 7, pp.845-862.
https://search.emarefa.net/detail/BIM-336126

Data Type

Journal Articles

Language

English

Notes

Includes appendix : p. 853-862

Record ID

BIM-336126