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رفتار برش منگنه یی دال های تخت تقویت شده با بتن ecc
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نویسنده
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هاشمی سالانقوچ بهداد ,اصفهانی محمدرضا
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منبع
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مهندسي عمران شريف - 1399 - دوره : 36-2 - شماره : 4/2 - صفحه:133 -142
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چکیده
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در این پژوهش، ساخت و تقویت دالهای تخت با استفاده از بتن ecc و تاثیر آن برروی برش منگنهیی دالها بررسی میشود. نه عدد دال بتن مسلح به ابعاد 1000x 1000 میلیمتر با ضخامتهای متفاوت و درصد فولاد یکسان ساخته و آزمایش شدند. سایر پارامترهای متغیر در نمونهها شامل وجود برشگیر در اتصال لایهی تقویتی به دال، نوع بتن و نوع آب مصرفی هستند. بارگذاری بر روی سکوی بتنی دال با استفاده از یک جک فشاری انجام شده است و تکیهگاهها بهصورت سادهاند. نتیجههای آزمایشها بهصورت نمودارهای بار تغییرمکان هستند که نشان میدهند استفاده از بتن ecc در ساخت و تقویت دالها موجب افزایش سختی خمشی و برشی و مقاومت برش منگنهیی دالها میشود. از طرفی استفاده از آب مغناطیسی باعث بهبود روانی بتن ecc شده است.
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کلیدواژه
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برش منگنهیی، دال بتنی، تقویت، آب مغناطیسی، ecc
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آدرس
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دانشگاه فردوسی مشهد, دانشکده ی مهندسی عمران, ایران, دانشگاه فردوسی مشهد, دانشکده ی مهندسی عمران, ایران
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پست الکترونیکی
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esfahani@um.ac.ir
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PUNCHING SHEAR BEHAVIOR OF FLAT SLABS STRENGTHEND WITH ECC CONCRETE
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Authors
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Hashemi Salamghouch B. ,Esfahani M.R.
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Abstract
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The present study investigates the punching shear behavior of flat slabs strengthened by ECC concrete. In addition, it studies the effect of magnetic water in a mixture of ECC concrete. In the experimental part of the study, nine reinforced concrete slab specimens with the dimensions of $1000times1000$ mm with the same reinforcement ratio were constructed and tested. The reinforcement ratio of the slabs was . The slab thickness varied in different specimens. One specimen with mm thickness was made of plane concrete. Six specimens were made by combining the plane concrete and ECC concrete layers with different thicknesses of and mm. Two of the specimens were made by ECC concrete with mm thickness. The mixture of plane concrete incorporated an ordinary Portland cement with a watercement matrix ratio of . This ratio was for ECC Concrete. In some specimens, the Ushaped shear studs were used for a better connection between the ECC concrete and plane concrete layers. ECC concrete has been used on the tension side of the slabs. Both punching shear strength and displacement of each specimen were measured by a Linear Variable Displacement Transducer (LVDT). During the punching shear tests, the load and maximum deflection were recorded by a data acquisition system and onsequently, the loaddisplacement curves were drawn. The tests were conducted using a testing machine to apply the load at an average rate of kg/sec. A hydraulic jack was fixed to the frame and used to apply the concentric load on the column stub. The hydraulic jack had a maximum capacity of kN. The results of the tests indicated that the ECC concrete enhanced the punching shear strength of slabs. The magnetic water improved the ECC concrete flow and loadcarrying capacity of the slabs. Ushaped shear studs increased the loadcarrying capacity of the specimens.
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Keywords
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