This work theoretically investigates the nonlinear behaviour of
reinforced concrete dee aimed topcantilever beams with concentrated loads
at their free ends The study is aimed to in investigate the behaviour
and respnse of such deep cantilever bea
ms, and to help structural
engineers to design and adopt appropriate reinforcement detailing of
such elements. A complete review of literature on this subject is
made.
This research study the impact of additions to improve
limestone mortar properties to become comparable to hydraulic
lime which is used in other countries, by using additions relative
to that were used in the old mortar, also used modern additions
like fiber glass to limit unwanted contraction in the use of
limestone mortar, , especially in arid environments.
It is considered the foundation is the structural element which transfers
loads applied in all load conditions to soil incorporation, thus achieving
stability and resistance and landings allowed economic and testing the
appropriate requirements.
Thus this research will conduct a comprehensive study of cracks and
landings and trends that take place in the old facilities, and to identify the
reasons for their occurrence.
This research deals with analytical study of exterior Beam-Column
connections behavior under seismic load.
Tow parameters were considered: axial load on the column and
confinement of joint region with stirrups.
Ansys program was used to analytica
l study of three types of exterior
Beam-Column connections under cyclic load.
The results were shown a good agreement with general behavior of
three types.
The analytical results indicate that the tow parameters will improve
the behavior of the connections delay cracking at joint core and
increasing connection stiffness in rotation and displacement with
decreasing shear value at joint.
Our Paper is a laboratory modeling research to evaluate the efficiency of finite element model in emulation the behavior of R.C. beams with shear deficiencies (ultimate load, mechanism of cracking and failure, load-deflection behavior) strengthened w
ith GFRP strips.
We tested nine R.C. beams 200x30x16 cm in three groups, the first consists of three R.C.beams for comparing, the second consists of three strengthened R.C. beams with two sides vertical GFRP strips, and the third also consists of three strengthened R.C. beams with two sides inclined (45°) GFRP strips.
We modeled these beams by advanced finite element program Ansys10, and we get results agreed with our laboratory study.
The mixed use of steel bars and carbon rods in concrete beams can offer beams with different behaviour from that of steel reinforcement only. This paper studies the case of reinforcing concrete beams with two layers of bars, and the main parameters
investigated are the proportion and the distribution of carbon rods in the cross-section. Four groups containing 12 beams are tested, and each is reinforced with 4 bars located in two layers. The first group includes three control beams reinforced with steel bars, while the second includes three beams reinforced with carbon bars. Each of the third and fourth groups includes three beams reinforced with two steel bars and two carbon bars, whereas in the third group, steel bars are located above carbon ones, but in the fourth group, steel bars are located under carbon ones. Concrete beams reinforced with carbon rods in the second group exhibit a higher load carrying capacity and deflections, compared with other beams. However, the beams in the third and fourth groups have approximately the same load carrying capacity and the same behaviour up to the load level equal to 75% of their load carrying capacity. But after that, the beams in the fourth group become more deformed, compared with those of the third group.
تناول البحث تصنيفاً معلوماتياً للتشققات في مقاطع البيتون المسلح استناداً إلى مبادئ المعلوماتية
و بالتحديد علاقة شينون في دراسة هذه التشققات ، و استنتاج مدى احتمال حدوث كل نوع من
التشققات المدروسة في كل مرحلة من مراحل عمل المادة (المرحلة المرنة و ال
مرحلة اللدنة). كما
أنه تم تحديد عوامل الأمان لمقاومات البيتون على الضغط و على الشد حسب نوع التشقق المراد
الحصول عليه و أبعاد المقطع العرضي . و هذا يعطي آفاقاً جديدةً لإدخال علم المعلوماتية ضمن علوم
الهندسة الإنشائية لتصميم مقاطع البيتون المسلح بتشكل التشققات .
