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Article
EXPERIMENTAL STUDY OF SHORT COLUMNS BEARING CAPACITY SUBJECTED TO UNIAXIAL LOADING
دراسة عملية لسعة التحمل للأعمدة القصيرة المعرضة لأحمال لامركزية باتجاه واحد

Author: Assim Mohammed Lateef عاصم محمد لطيف
Journal: DIYALA JOURNAL OF ENGINEERING SCIENCES مجلة ديالى للعلوم الهندسية ISSN: 19998716/26166909 Year: 2016 Volume: 9 Issue: 4 Pages: 11-23
Publisher: Diyala University جامعة ديالى

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Abstract

Columns can be defined as individuals that carry loads mainly in compression. Frequently, columns carry bending moments as properly, about one or each axis of the cross section. The bending moment action may produce tensile stresses over a part of the cross section. In this research, twenty-four column samples distributed into eight groups were cast to investigate the structural behavior under loading with varying bar diameter, clear cover of vertical reinforcement and concrete strength. Samples designed to fail by tension. The loading rate was set to be from fifteen to twenty percent of designed capacity. The results showed that increasing concrete strength leads to increase in bearing capacity, the load that needs to cause the first crack and decreasing in crack width. Increasing steel bars size showed rising in a column bearing capacity, the load that needs to occur the first crack, crack width and decreasing the number of cracks in tension area. While the large concrete cover caused increasing in bearing capacity, the crack width and reduce the load that needs to produce the first crack.

تعرف الأعمدة بأنها تلك الأعضاء الإنشائية التي تتحمل بصورة رئيسية قوى الانضغاط والعزوم حول أحد أو كلا محوري مساحة المقطع. عزم الانثناء يؤدي الى توليد اجهادات الشد على جزء من مساحة المقطع. في هذا البحث تم صب أربعة وعشرين عمود موزعة على ثمان مجاميع لتحري السلوك الانشائي تحت تأثير التحميل مع تغيير أقطار قضبان حديد التسليح المستخدم، الغطاء الخرساني الصافي للقضبان العمودية ومقاومة الخرسانة، العينات صممت لتفشل نتيجة الشد. نسبة التحميل كانت تتراوح ما بين خمسة عشر الى عشرين بالمئة من الحمل التصميمي. أظهرت النتائج ان الزيادة في مقاومة الخرسانة تؤدي الى زيادة تحمل العمود، الحمل اللازم لحدوث اول تشقق ونقصان في عرض الشق. الزيادة في قطر حديد التسليح أظهرت زيادة في تحمل العمود، الحمل اللازم لحصول اول تشقق، عرض الشق ونقصان في عدد الشقوق في منطقة الشد. بينما استعمال غطاء خرساني كبير سبب زيادة في تحمل العمود، عرض الشق ونقصان في مقدار الحمل اللازم لحصول اول شق.


Article
Mechanical Properties of Self-Compacted Concrete

Authors: Ammar SaleemKhazaal --- Alyaa Abbas Ali --- Assim Mohammed Lateef
Journal: Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية ISSN: 1813162X 23127589 Year: 2016 Volume: 23 Issue: 1 Pages: 40-52
Publisher: Tikrit University جامعة تكريت

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Abstract

In this research, trial mixes were conducted according to Self-Compacted Concrete (SCC) specifications, a mix that gave a higher compressive strength to the age of seven days has been selected. Then after selecting the appropriate mix, concrete samples had poured and were distributed into five groups; each group consists of six cubes, six cylinders, and six prisms. The samples of each group are testing for compressive, tensile splitting, and flexure strengths respectively for the ages of 7, 14, 28, 60, and 90 days respectively. Before of conduction of destructive tests, the samples were tested using ultrasonic waves to determine the relationship between the concrete strength and pulse velocity and in the same way for all ages in above. Experimental results showed that, all concrete mechanical properties have improved, and the maximum improve was in flexural strength followed by compressive strength and tensile splitting strength. The cube compressive strength increased according to (G1 at 7 days curing) from 34.3% to 71.8%, the percentage of increase of tensile strength according to (G1 at 7 days curing) from 16.8% to 64.3% , modulus of rupture increased according to (G1 at 7 days curing) from 34.6% to 98.7% for ages (14, 28, 60, 90 days) respectively. Pulls velocity increased according to (G1 at 7 days curing): For cube from 5.1% to 23.9%, for cylinder from 21.4% to 40.3%, for prisms from 7.1% to 29.2%.

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