000			04114namaa22004211i 4500
003			OSt
005			20250223033202.0
008			2310s2023 da frm 000 engnd d
040			_aEG-GICUC _beng _cEG-GICUC _dEG-GICUC _erda
041	0		_aeng _beng _bara
049			_aDeposit
082			_a624 _221
092			_a624 _221
097			_aPh.D
099			_aCai01.13.05.Ph.D.2023.Sh.S
100			_aShereen Mahmoud Mohamed Ibrahim, _epreparation.
245	1	0	_aScale down modelling investigating shear and torsion capacity of miniatures beams with continuous spiral ties as transverse reinforcement / _cShereen Mahmoud Mohamed Ibrahim ; Hamed Salem, Ahmed Youssef.
246			_aتحسين سلوك القص والالتواء للكمرات الخرسانية باستخدام تسليح عرضي متصل حلزوني
264		0	_c2023.
300			_a85 Pages : _bCharts, Illustrations ; _c30 cm. + _eCD.
336			_2rda content _atext
337			_2rdamedia _aUnmediated
338			_2rdacarrier _avolume
502			_aThesis (Ph.D)-Cairo University, Faculty of Engineering, Department of Civil Engineering, 2023.
504			_aBibliography: Pages 82-85.
520			_aيتناول هذا البحث دراسة سلوك القص والالتواء للكمرات الخرسانية باستخدام نماذج مصغرة. أربعة وثلاثون نموذج مصغر بمقياس ثُمن الحقيقي تم اختبارهم في القص والالتواء. .المتغيرات الرئيسية في هذا البحث شكل الكانات والمسافة بين الكانات ونسبة ذراع القص إلى العمق. الشكل النهائي للانهيار وحمل القص عند الانهيار وكذلك عزم الالتواء بالإضافة الى الترخيم تم تسجيلها حتى نلقى الضوء على آلية انهيار القص. النتائج المعملية أوضحت أن استخدام كانات متصلة تؤدى إلى تحسين أحمال القص القصوى وكذلك الممطولية وتؤدى إلى تحويل شكل الانهيار إلى سلوك أكثر ممطوليه.
520			_aThe nonlinear shear and torsion failure mechanism of small-scale (RC) miniatures beams with staggered spiral stirrups is inspected. Thirty-four miniatures RC beams were tested for shear and torsion. The significant parameters were stirrup’s interval, shear arm ratio a/d, and shear RFT shape. All miniatures inspected in this experimental study were reduced in size to one-eighth the prototypes size. Small scale RC miniatures were used because of their economic feasibility and ease of manufacture. Mortar was applied instead of normal concrete to reduce the size effect through using small scale models. The staggered spiral rectangular stirrup is formed and used in a rectangular section RC miniature beam as an alternative to normal stirrups. The primary objective of this experimental study was to improve shear capacity, ductility, shear crack propagation, and torsional moment capacity. It was discovered that using staggered spiral reinforcement instead of closed reinforcement could result in a considerable increase in shear and torsion capacity by 33% and 41%, respectively. As a result, the expected capacity of the prototype RC model were calculated in detail, taking into account the scale down factor used by the authors. Calculated values based on international standards and specifications were used to compare the experimental finding.
530			_aIssues also as CD.
546			_aText in English and abstract in Arabic & English.
650		0	_aStructural Engineering.
653			_aReinforced Concrete _aReinforcement _aSmall scale modeling
700			_aHamed Salem, _ethesis advisor.
700			_aAhmed Youssef, _ethesis advisor.
856			_uhttp://172.23.153.220/th.pdf
900			_b01-01-2023 _cHamed Salem _cAhmed Youssef _dHatem Mostafa Mohamed _dAlaa Ali El Sayed _UCairo University _FFaculty of Engineering _DDepartment of Civil Engineering
905			_aMohamady _eHanan
942			_cTH _2ddc
999			_c165538 _d165538