Different techniques have been developed for strengthening R/C slabs against punching: enlargement of the support, gluing external fibre reinforced polymers or casting a bonded concrete overlay (BCO) on the slab's top surface, insertion of post-installed steel bolts, application of fibre reinforced polymers cords as shear reinforcement. Four full-scale RC slabs (1500×1500×120 mm) were tested under monotonic four-point bending. To assess the efficiency of the hybrid strengthening technique for the increase of flexural load carrying capacity of RC slabs, the slab strip specimens represented in Figure 1 were used. Structural Strengthening Method Of Beam Column Slab Ponent. This includes air temperature, humidity, concrete temperature, and wind speed. The first slab was an unstrengthened concrete slab which was used as a control. Texas Strengthening Technologies handles post-tension repairs, slab on grade and elevated, barrier cable-design and installation, carbon fiber design and installation, concrete repair, enlargements, form and pump pressurized form-work, and everything else needed to strengthen your existing concrete structures in North Texas. To assess the efficiency of the hybrid strengthening technique for the increase of flexural load carrying capacity of RC slabs, the slab strip specimens represented in Figure 1 were used. Based on international structural codes: ACI 440.2R-17 and ACI 318-14, TR55 and EUROCODE 2 and various local codes. Remove the concrete cover. October 4, 2020. Please note that we do not accept returns or grant refunds on any of our eBook/digital products. Bonded Slab Post-Tensioning; Stay Cable Systems. One of the important structural elements is slab which is may crack due to overloading, change of building function, or fabrication errors. slab also increases after BRCO strengthening ( , ), with usually the flexural capacity ( ) also increasing. Clean the reinforcing steel bars using a wire brush or a sand compressor. Clean the reinforcing steel bars using a wire brush or a sand compressor. The used method depends on several factors, such as the strengthening required, the location where strengthening is required, and architectural requirements. This suggests that all initial stiffness values are similar regardless of the type of strengthening method used. An experimental program was carried out to investigate the effectiveness of a novel near surface mounted (NSM) technique using innovative manually made CFRP rods (MMRs) and manually made CFRP strips (MMSs) for flexural strengthening of reinforced concrete (RC) two-wayslabs with low clear cover thickness. 10.3. Installing dowels at 25-30cm spacing in both directions using an appropriate epoxy material. Cleaning and roughening the concrete surface. The main advantages of this technique over the traditional prestress strengthening systems that use mechanical anchorages are that it does not need external permanent anchorages, meaning that the forces are introduced into the concrete gradually instead . 2. Repair and strengthening applications include column wrapping, beam strengthening, floor slab strengthening, and reinforcement around new openings. His initial foray in the sleep field involved applying machine learning and signal processing techniques on EOG data to detect the presence of Rapid Eye Movements. The flexural members of beams and slabs are strengthened by insufficient bearing capacity, including two aspects of the positive and inclined section.The appearance of insufficient bearing capacity is too large deflection, too wide cracks . Our products can be used stand-alone, or combined together, to solve nearly any project requirement. This paper discusses different techniques for strengthening of R/C slabs against punching: insertion of post-installed shear reinforcement, application of external fibre reinforced polymers or a bonded reinforced concrete overlay (BRCO) on the slab top surface, enlargement of the support, application of a post-tensioning system. These methods are used to: Coat the steel bars with an epoxy material that prevent corrosion In Block III, the section sizes of frame columns are 300 mm *350 mm, 350 mm *350 mm, and the section sizes of frame beams are 250 mm *450 mm and 250 . Flat slab strengthening techniques against punching-shear Highlights•Punching strengthening is required due to design/construction errors, load increase, etc.•Strengthening techniques are compared using the Critical Shear Crack Theory.•A case study is dealt with to give indications for strengthening pre-dimensioning.•Predicted punching strength of strengthened slabs agrees with . 49 This paper presents shear strengthening techniques that can be used on existing concrete thick 50 slab structures to improve the shear capacity (Fig. 3 Techniques for Efficient Concrete Curing. Four full-scale RC slabs (1500×1500×120 mm) were tested under monotonic four-point bending. The flexural performance of the slab can be improved by overlays or underlays. Column was placed under three condition eccentric, centric and edge. The main advantages of this technique over the traditional prestress strengthening systems that use mechanical anchorages are that it does not need external permanent anchorages, meaning that the forces are introduced into the concrete gradually instead . By using the CFRP sheet in RC slab increased the flexural ultimate load caring capacity of the central, Two of the tested slabs (one strengthened and one control) contained openings in the . Heavy Lifting, Lowering, & Sliding ; Bridge Erection & Construction Systems; Products for Existing Construction. Different configurations of the shear bolts around the column were tested. Structural strengthening may be required for existing concrete building structures for the increased load capacity of beams, columns, walls, and/or slabs, and for supporting additional live or dead loads not included in the original design. Clean the exposed concrete surfaces and steel reinforcement. V-Wrap™ FRP Composite Systems; Strengthening with Post-Tensioning; Tstrata Enlargement Systems™ DUCON® Micro-Reinforced . In order to ensure the durability of the frame beams and columns, a layer of epoxy resin adhesive can be coated on the surface, fine sand can be sprayed, and finally the painting can be completed. REVIEW OF STRENGTHENING TECHNIQUES USING EXTERNALLY BONDED FIBER REINFORCED POLYMER COMPOSITES Report 2002-005-C-01 The research described in this report was carried out by Project Leader Dr. Sujeeva Setunge Team members Prof. Arun Kumar, Dr. Abe Nezamian and Dr Saman De Silva (RMIT) Dr. Alan Carse, Mr. John Spathonis and Ms. Louise Chandler (QDMR) Mr. Dale Gilbert (QDPW) Mr. Bruce Johnson . The rest three specimens were strengthened using three different techniques Glass Fiber . However, most of the studies have focused on the strengthening of RC beams [7-10] or slab strips [11-15]. Strengthening of slab. STRUCTURAL TECHNOLOGIES offers an extensive line of products and technical services to restore or enhance the load-carrying capacity of reinforced concrete, masonry, timber and steel structures. Remove the concrete cover. The second slab was cast to mimic the first but featured an overlay of FRP and UHPC after installing shear connectors. Our in-house team of strengthening experts . The used method depends on several factors, such as the strengthening required, the location where strengthening is required, and architectural requirements. Stay Cables; Cable Armor; Bridge Armor; Force Protection; Construction Systems. Experimental Work Program 2.1. It was found that the single-web PHC slab This technique is used on vertical surfaces such as walls, columns and other combinations . Removing the concrete cover and after cleaning the reinforcement steel, coating it with the material which will prevent the corrosion. An experimental program was carried out to investigate the effectiveness of a novel near surface mounted (NSM) technique using innovative manually made CFRP rods (MMRs) and manually made CFRP strips (MMSs) for flexural strengthening of reinforced concrete (RC) two-wayslabs with low clear cover thickness. This paper discusses different techniques for strengthening of R/C slabs against punching: addition of post‐ installed shear reinforcement, gluing external fibre reinforced polymers, casting a bonded reinforced concrete overlay (BRCO) on the slab's top surface, enlargement of the support or application of a post‐ tensioning system. Experimental results of four-point bending tests, carried out in unstrengthened and strengthened concrete slab strips, are presented and analyzed. This paper discusses different techniques for strengthening of R/C slabs against punching: insertion of post-installed shear reinforcement, application of external fibre reinforced polymers or a. The authors . This paper presents an experimental and numerical study on reinforced (RC) slabs strengthened in flexure with prestressed CFRP strips as . hogging B.M.) The loading tests performed as well as the 51 comparison between shear capacities of concrete thick slab strips (beams) strengthened and 52 unstrengthened in shear are presented. The new strengthening technique consists of shear bolts externally installed in holes drilled through the slab thickness. This is called slab jacking when the slab is to be lifted by pressure injection. The main purpose of injections is to restore the . As the blows continue, the impact force tends to decrease, which indicates a reduction in the bearing strength of the test specimen. 3.1 Strengthening Techniques for RC Slabs with Cut-Outs The addition of overlays/underlays will also increase the stiffness of the slabs and control the excessive deflections. In case of negative moment deficiency (i.e. slab jacking technique, strengthening of interior reinforcing. 49 This paper presents shear strengthening techniques that can be used on existing concrete thick 50 slab structures to improve the shear capacity (Fig. This research was focused on studying three of the most popular innovative slab strengthening techniques: GFRP sheets, carbon fiber laminate strips, and near surface mounted steel rebars. Strengthening Of Steel Structures With Fiber Reinforced Polymer Posites Sciencedirect. This strategy consists of applying CFRP laminates on the tensile bottom slab surface, according to the NSM technique, and bonding, with appropriate epoxy-based adhesive, a SFRC layer in the compression top slab surface (see Fig. On the strengthened slab, the FRP was installed on top of the slab, which is the compression side. All the strengthening techniques made an enhancement in the ultimate and cracking strength. The cross section dimensions and the test set up of the tested slab strip specimens are also illustrated in Figure 1. For strengthening of existing structures externally, FRP . The . As depicted in Figure 4, the dashed line represents the behaviour before strengthening. Grout and Epoxy Injection Grout injection is a popular strengthening technique, as it does not alter the aesthetic and architectural features of the existing buildings. 4 Pive Shear Strengthening Methods For Rc Beam A Extra Stirrups Scientific Diagram. various methods of strengthening of slabs. 109-1 10th International Conference on Short and Medium Span Bridges Quebec City, Quebec, Canada, July 31 - August 3, 2018 THICK CONCRETE SLAB BRIDGES: STUDY OF SHEAR STRENGTHENING Fiset, Mathieu1,3, Frédéric, Bédard1, Bastien, Josée1, Mitchell, Denis2 1 Université Laval, Canada 2 McGill University, Canada 3 Mathieu.Fiset.1@ulaval.ca Abstract: Efficient shear strengthening techniques . Two unstrengthened RC slabs formed a . To validate this novel strengthening technique at the positive moment section of RC slab, two one-way slabs were cast. In this research, efficiency of slab strengthening was judged by comparing the behavior of strengthened specimens from the point of view of cracking and ultimate loads, cracking mechanism, and mode of failure. The main advantages of this technique over the traditional prestress strengthening systems that use mechanical anchorages are that it does not need external permanent anchorages, meaning that the forces are introduced into the concrete gradually instead . Externally Bonded Reinforcement (EBR) technique has been widely used for flexural strengthening of concrete structures by using carbon fiber-reinforced polymers (CFRP). reinforcement strengthening technique [5,6], and the results have shown the effectiveness of this technique in improving the flexural and shear behavior of RC structural members. There are little Remove all cracked, spalled and loose concrete. In this research, efficiency of slab strengthening was judged by comparing the behavior of strengthened specimens from the point of view of cracking and ultimate loads, cracking mechanism . EBR technique offers several structural advantages when the CFRP material is prestressed. Coming from an engineering background, Ben's work blends Bayesian modeling and machine learning techniques with memory and sleep data. These holes are filled with cement mortar with low viscosity. reinforcement strengthening technique [5,6], and the results have shown the effectiveness of this technique in improving the flexural and shear behavior of RC structural members. The . In addition, the stiffness of RCS has increased and failure due to deflection occurred at 1.75% of the span length. The experimental program is composed of three series of three slab strips of two equal span length, in order to verify the possibility of . Coat the steel bars with an epoxy material that prevent corrosion advantages and disadvantages of slab jacking techniques, how . There are little 2. The loading tests performed as well as the 51 comparison between shear capacities of concrete thick slab strips (beams) strengthened and 52 unstrengthened in shear are presented. 2). Strengthening of the slab by post stressed reinforcement. connection as a strengthening technique. Complex calculations in minimum time. To assess the effectiveness of the near surface mounted (NSM) technique, in terms of load carrying and moment redistribution capacities, for the flexural strengthening of continuous reinforced concrete (RC) slabs, an experimental program was carried out. The technique of lifting a slab sitting on the soil by pressure ejection grout is called Slab Jacking Technique '. Applications of Slab Jacking Technique: Highway maintenance In comparison with the strengthening techniques, the impact force shows a similar strength at the first blow. This research was focused on studying three of the most popular innovative slab strengthening techniques GFRP sheets, carbon fiber laminate strips, and near surface : mounted steel rebars. Steel Plated Concrete Posite Technique And Ering Lications . Strengthening a slab by increasing its depth from the bottom. In this research, efficiency of slab strengthening was judged by comparing the behavior of strengthened specimens from the point of view of cracking and ultimate loads, cracking mechanism, and mode of failure. experimentally investigated. Structural Strengthening. Generally showed web-shear strength in end regions is much less than the one predicted by (ACI 318-14), V cw equation (ACI-22.5.8.3.2). Strengthening of Slabs on Existing RC Slab || Shotcreting. Steps of Isolated Footing Strengthening. 17373. Making holes the whole span of beam and to the full width under the slab with a spacing of about 150-250mm. In this article we explain how to do strengthening of existing slabs. steel ratio has been increased largely by 671%. Structural strengthening method of beam slab component. I wrote this eBook in 2009. Knowing The Design Load Capacity From The Drawing. This work aims to study a new flat slab strengthening technique based on post-tensioning with anchorages by bonding using an epoxy adhesive. An isolated footing is strengthened by increasing the size of the footing and the reinforcement steel bars as follows: Excavating around the footing. This paper discusses different techniques for strengthening of R/C slabs against punching: insertion of post-installed shear reinforcement, application of external fibre reinforced polymers or a bonded reinforced concrete overlay (BRCO) on the slab top surface, enlargement of the support, application of a post-tensioning system. This work aims to study a new flat slab strengthening technique based on post-tensioning with anchorages by bonding using an epoxy adhesive. But when only the holes are to be filled, it is called 'pressure grouting'. new openings but with strengthening of the slab required there are several common strengthening methods that can be considered. Includes full range of Sika Structural Strengthening Systems. Both slabs were treated as simple beams with a region that contained positive . Concrete beams and slab members are the most widely used structural members in the current project. The authors . Introduction One of these slabs was tested as reference (control) specimen. Jacketing is a method of structural retrofitting and strengthening It is used to increase bearing load capacity following a modification of the structural design or to restore structural design integrity due to a failure in the structural member. There are also some other techniques used for strengthening a reinforced concrete slab such as: Increasing the shear bearing capacity of the slab by adding steel plates strengthened by vertical screw bolts. Many factors affect the rate at which water evaporates from freshly placed concrete. Strengthening techniques were applied on the bottom surface of fifteen slab specimens. 2). Using FRPs for strengthening have turned out be an effective technique suitable for several structural elements such as beams, columns, walls, and slab. Though I'm much more knowledgeable now and a much greater scientist, I'm still very proud of this eBook. Strengthening Existing Concrete Structures . In recent years, several researchers have been studying the use of FRP sheets or laminates to strengthen concrete structural members. From the engineering drawings, specifications of the floor slabs such as the concrete thickness . Four slabs were strengthened and two slabs, used as control specimens, did not contain any shear reinforcement. In the paper, the authors apply the Critical Shear Crack . slab is strengthened by overlay while in case of positive moment . More recently, his work on sleep dynamics and big data has quantified the influence of . Apply shortcreting/polymer concrete for patch repair work and grouting for porous/honeycombed concrete. August 12, 2020 by Sanjay Singh. To assess the effectiveness of the NSM strengthening technique to 2. Four slabs were strengthened and two slabs, used as control specimens, did not contain any shear reinforcement. The first specimen slab had no strengthening and considered as a control and the other six specimens were strengthened with either different embedded lengths of near-surface mounted bars; or using . Poor construction supervision. Different configurations of the shear bolts around the column were tested. Provide additional reinforcing bars, if the loss in reinforcement is more than 10%. CFRP sheets were installed on the tension side of the slab to increase the flexural capacity at the negative moment region. The design load capacity is the planned capacity specifically used for design purposes. The depth and shear demand limitations were defined on the research results that concluded that prestressed concrete hollow-core slabs with a depth greater than 12.5 in. Design Services All these strengthening techniques require careful consideration of the existing and desired loading regimes to establish what strengthening methods are feasible and to determine an economic and technically appropriate design. Two unstrengthened RC slabs formed a . It was conducted by a former master student (Wu, 2015). Free Sika® CarboDur® FRP Design Software. Strengthening a slab by increasing its depth from the bottom. Support the structural members properly as required. Strengthening a slab by increasing its depth from top . In addition, a control slab specimen without any strengthening was used for purpose of comparison. Procedure for strengthening. This paper discusses different techniques for strengthening of R/C slabs against punching: insertion of post-installed shear reinforcement, application of external fibre reinforced polymers or a bonded reinforced concrete overlay (BRCO) on the slab top surface, enlargement of the support, application of a post-tensioning system. Key Words: strengthening slab, CFRP products, EBR, RC slab. Nowadays, generally new techniques appear in strengthening field. This work aims to study a new flat slab strengthening technique based on post-tensioning with anchorages by bonding using an epoxy adhesive. It is also required to relieve stresses generated by design or construction errors or for the restoration . new openings but with strengthening of the slab required there are several common strengthening methods that can be considered. The new strengthening technique consists of shear bolts externally installed in holes drilled through the slab thickness. work in Phases I focused on applying the proposed shear strengthening technique to I-shaped single-web PHC slabs cut out longitudinally from full-width slabs to assess the feasibility and effectiveness of this shear strengthening technique. Methods of Strengthening 1. As a result, many techniques have been developed to help concrete retain moisture at the early ages. In the present work, the combined strengthening strategy, a SFRC overlay and NSM CFRP laminates, was applied to significantly increase the flexural resistance of existing RC slabs. Methods of Strengthening 1. The test results showed that both carbon fiber laminates and rods . Its strength depends on the strengthening layer thickness, the cement mortar strength, the reinforcement quantity and the means of its bonding with the retrofitted wall. The reaction force represents a load . Two of the tested slabs (one strengthened and one control) contained openings in the . However, most of the studies have focused on the strengthening of RC beams [7-10] or slab strips [11-15]. 3.1 Strengthening Techniques for RC Slabs with Cut-Outs Adding steel beams. This technique of strengtheninghas resulted in a decrease in the RCS maximum deflection by about 21%. Two full scale RC slabs were cast and tested to failure; the first as a control and the second using this new strengthening technique. Strengthening Of Reinforced Concrete Beam Rc Methods. Applying the BRCO on the tensile face of the slab leads to an increase of stiffness and flexural capacity, A thin UHPC overlay was cast above the FRP, forming an effective composite where the UHPC resisted all of the . This research was focused on studying three of the most popular innovative slab strengthening techniques: GFRP sheets, carbon fiber laminate strips, and near surface mounted steel rebars. Free software for advanced structural design. Strengthening a slab by increasing its depth from top . Procedure for strengthening. The cross section dimensions and the test set up of the tested slab strip specimens are also illustrated in Figure 1. Two general ways to determine the loading of the floor slab, which are: i. Updated on a regular basis. The terminology and concepts I coined, including load vector training, as well as the glut 1).

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