Copyright © 2018 Authors. This is an open access article distributed under the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. International Journal of Engineering & Technology, 7 (4.19) (2018) 843-848 International Journal of Engineering & Technology Website: www.sciencepubco.com/index.php/IJET Research paper Structural Behavior of Continuous Steel-Reactive Powder Concrete Composiate Beams Under Repeated Loads Rasha Yassien Dakhil* 1 , Mustafa B. Dawood 2 2 Prof, 1,2 Engineering College, Babylon University *Corresponding Author Email: rashaalrakaby@gmail.com Abstract A study for the continuous composite steel-reactive powder concrete beams under repeated loads were executed experimentally and analytically. In the experimental part, six continuous composite sections were constructed as test beams. " The ‘“ decks slab concretes " was connected tos steel I-beams by headed steel studs welded to the top flanges “ ofs “ thes ‘‘ steel I-beams. “ T,he dimensions “ of “ the “ deck slab is (2200×250×80mm), while the type of I-beam is (IPE 140) with length of (2200mm). For the present work, the experimental work includes also examining the shear in the links by creating two models (push out) and tested to determine the properties and behavior of the studs. The behavior of the studs were conducted by " getting load-slip curves. In the part of the,oretical, ‘‘. tested beams.was numericallysmodeled then analyzed using thesfinite element method. ‘“ Thes “ numerical models were carried out in three dimensionss bys “ the software package (ANSYS 16.1). Verifi,cationsof thesnumericalsresults “ was donesbyscompari,ngs thems with the experimentals results. “Thesresultssof thesfiniteselementsanalysissshowed good agreements ‘ with the results ofsthe experimental tests. The maximumsandsminimum difference ‘‘ in ultimate loa,ds for beams ‘‘ were (5.85% and 1.33%) respectively. The results show that stiffenerssof beamssandsstrengthening with CFRP shall increase the ultimate load capacity ‘ and affects on ‘‘ mode of failure “ of theses beams. ‘ Keywords: Continuous composite member, " Reactive Powder Concrete " ,repeated loads and CFRP. 1. Introduction Continuous composite " construction as one " of the common methods of construction in " bridges and buildings. Composite member is " connecting different materials together inorder to build a composite structural member with desirable properties of the materials. The reason behind that is to make full advantage of the construction materials since there is no material that can provide all the structural requirements. Continuous composite steel- concrete beams have been widely used because of the satisfactory utilization.of the two materials, steel and concrete. Reducing ors “ preventing thesrelative displacement of concrete and steel section guaranteessthe composite action. Shear connectors are useds “ tos provides this composite action. " Composite action is “ the “ degree of the connection “ (or bond) between thesconcrete deck slabsandssteelsI-beasm. " Thesdegree " ofscomposite action is mainly affected by mechanical and geometrical properties of shear connectors. The degreesof the "“ composite action is ranging between thescase “" of zero bond when there is no shear connectors between the integrated material and case of full bond when there is enough number of shear connectors. In case of full bond, one can assume there will be no “" relative slip “" occurred “ between concrete " slab “ and " steel beam " and the two components will act as one unit. Non-deformable connectors may cause excessive bearing stresses which may cause crushing in concrete, due that complete connection is not preferable in the composite sectionAl- Thebhawi (2005). Shear connectors are used to resist longitudinal slip along the contact surface and consequently resist shear forces, in addition to that resist the vertical splitting forces which try to separate the composite materials. when used CFRP, thes ultimates loads capacitys was enhanced by 6% ands thesload-deformation curve was enhanced by about 75% whens compareds withs unstrengtheneds specimenss..Alis(2014). 2. Reactive Powder Concrete Onesof thesachievementssof thesrecent revolutionsof concrete is Ultra-high performance concretes(UHPC)”like “ reactivespowder concrete RPC " sChandra (2014). “ Reactives powdersconcreteis an ultra-high strengths and highsductility compositesmaterials with advancedsmechanical propertiesswhichsis developeds in 1990’s by French companysBouygues. “ The disadvantages of RPC are “ that its ingredients are expensive and require special attention in preparing, mixing, handling, casting and curing, therefore using RPC in a structural application requires special analysis to use smaller section size to reduce the overall cost. “ Thes producers expect thatsas RPC becomes more common inpractice, the cost of useswillsdecrease and they suggeststhat savings will “ be achievedsoversthe lifescycle whenscomparedsto conventional solutions.  “ Itss superiors strengthscombineds withs high shears capacity results in significantsdead loadsreductionsand less “ limitedsshapes of structsuralmesmbers O’Neil and Dowd(1995).  “ RPC hassthesabilitysto restrictsthe directstensilesstressess “ so rebar shear indispensable.  "RPCs “ providessimproveds “ seismic performancesby “ reducing inertiasloads with lightersmembers, “ allowingslarger deflections withsreduced