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Assessing The Dead Loads Effect on the Dynamic Behavior of Plates by Using Finite Elements Method
مصفوفة الجساءة للاعضاء ذات النهايات المثخنة متضمنة ادخال تأثير تشوهات القص العرضي

Author: Abbas Abdel-Majid Allawi
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2007 Volume: 25 Issue: 3 Pages: 328-333
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

In this research, a rectangular plate element for the finite elementsmethod, which takes into consideration the effect of dead loads, is proposed.The element stiffness matrix that includes the effect of dead loads is derived. Itis shown that the stiffness of plate increases when the effect of dead loads isincluded in the calculations. The validity of the proposed method is confirmedby numerical example and the results show a good agreement when comparedwith that obtained from the closed-form solutions. The proposed methodbased on a finite elements formulation is more easily applied to plate’sstructures under different support conditions and various types of dead loads

في هذا البحث تم اقتراح عنصر صفائحي مستطيل لطريقة العناصر المحددة والذي ياخذبنظر الاعتبار تاثير الاحمال الميتة . ان مصفوفة الجساءة لهذا العنصر مع ادخال تا ثير الاحمالالميتة قد تم اشتقاقه ا. وقد لوحظ بان جساءة الصفيحة تزداد عند اخذ تاثير الاحمال الميتة فيالحسابات. وقد جرى اختبار الطريقة المقترحة بامثلة عددية وقد اظهرت النتائج تطابقا جيدا معتلك المستحصلة من صيغة الحل المغلق . ان الطريقة المقترحة وباستخدام صيغة العناصرالمحددة تكون سهلة التطبيق للمنشات الصفائحية تحت مختلف حالات الاسناد وتحت مختلفالاحمال الميتة.


Article
Building Information Modeling (BIM) as Economical and Properties Assessment Tool for Building Units Alternatives Made with Lightweight Foamed Concrete

Authors: Abbas M. Abd عباس مهدي عبد --- Dunya S. Jarullah
Journal: DIYALA JOURNAL OF ENGINEERING SCIENCES مجلة ديالى للعلوم الهندسية ISSN: 19998716/26166909 Year: 2018 Volume: 11 Issue: 2 Pages: 33-41
Publisher: Diyala University جامعة ديالى

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Abstract

Lightweight foamed concrete brick is new construction materials. It gives a prospective solution to building construction industry, this research aims to study the cost, dead loads, environmental issues and energy consumption from using lightweight foam concrete bricks as construction materials by utilizing building information modeling technique. The results obtained from this modelling proved that the cost of brick work using lightweight foamed concrete units of grade A (2000 kg/m3) and B (1800 kg/m3) is higher by (19.4% and 11.9%) respectively than the activity cost using traditional fired clay bricks. For grade C (1600 kg/m3) that cost was very close to fired clay bricks (+2.9%). while the construction of brick work using light weight foamed concrete units of grade D (1400 kg/m3) and E (1200 kg/m3) was lower by (8% and 18.6%) than fired clay bricks. Besides that, the dead load generated by building units was decreased by (7.7-38.5%) for grade (B, C, D, E) than the load of fired clay bricks, while the load generated from used lightweight foam concrete bricks grade is very closed to fired clay bricks (+2.5%). There was a reduction in energy consumption by the rate of (4.1-62.2%) for heating and (9.8-73.4%) for cooling as wall sharing in energy consumption. Environmental analysis showed sustainable potential so that the production of lightweight foamed concrete units reduces CO2 emission by (46.5-67.9%) compared with the fired clay bricks. Finally; it can be concluded that building units produced in this research with LWFC, characterized with properties can efficiently compete the fired clay bricks.

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