Abstract
The main objective of this research is to investigate the structural behavior and strength of reinforced reactive powder concrete beams with a hollow section subjected under two point concentrated loading. The experimental work consist of ten beams with dimensions (150mm width×200mm height×1000 mm length), eight of them are hollow beams and two solid beams were cast and tested up to failure. The major parameters adopted in the current research includes the hollowness ratio (10% and15%), hollow location (at top or at bottom), and hollow shape (circle or square). The amount of longitudinal and transverse reinforcement, concrete strength and the other parameters were kept constant for all the specimens. The comparisons between all specimens (hollow and solid) are based on the load carrying capacity, deflection, crack pattern and mode of failures. Results showed that the strength capacity of hollow beam when the hollow lies in the bottom is much higher than for top hollow, and the square hollow will lead to more decrease in the beam strength compared with the circular hollow and this is more evident when the hollowness ratio increases from (10% to 15%).
Highlights
البرنامج العملي.الهدف الرئيسي من هذا البحث هو التحري في سلوك ومقاومة عتبات خرسانة المساحيق الفعالة ذات المقطع المجوف تحت تأثير احمال مركزة ) ثماني منها مجوفة واثنتان منها صلدة تم اختبارها حتى1000 mm( ) وطول150mm×200mm(يشمل فحص عشر عتبات ذات مقطع عرضي بأبعاد ) وموقع التجويف (في الأعلى أو الأسفل) وشكل التجويف (دائري٪15 و٪10( شملت المتغيرات الرئيسية المعتمدة في البحث الحالي نسبة التجويف.الفشل من خلال الفحص العملي. المقارنة بالنتائج بين جميع العينات (المجوفة والصلبة) اعتمدت على قابلية التحمل والهطول وانماط التشقق واطوار الفشل.)أو مربع وان التجويف المربع يقلل من قابلية التحمل،أوضحت النتائج أن قابلية تحمل العتبات المجوفة في الموقع الاسفل أعلى من تلك الحاوية على التجويف في الاعلى
The results showed that the hollow beam providing by PVC pipe led to decrease in load capacity about (6.5-9%) and an increase in deflections about (33- 35%) at bottom and top respectively compared with the solid beams
The objective of this study is to investigate the strength and behavior of a supported reinforced concrete hollow beams cast from Reactive powder concrete Reactive Powder Concrete (RPC) under effect of static loads
Summary
In several fields, such as buildings, bridges, marine structures, halls and towers [1]. Hollow cross section beams has been widely used in building and bridge structures. Hollow cross sections may be used for the beauty of their shape and for the purposes of the architectural requirement, or in some cases where their use is determined by their engineering characteristics. Applications of hollow structural sections covered various fields. Using of RPC decreases the beams dimensions, and offers a stronger structural elements. It is classified as a form of Ultra High Performance Concrete (UHPC) [2] which is characterized by a dense mixture of high cement content, superior mechanical properties, excellent environmental resistance (high durability), toughness of fracture, fire resistance, and in most cases containing a steel fiber to reduce its brittleness [3]. Homogeneity of the mix and reducing the different tensile strain in the concrete and subsequently lead to an increase of load carrying capacity and great durability of RPC [4]
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