Therefore, the fiber model needs only two uniaxial constitutive models, one for concrete and the other for steel bars. For the numerical analysis of repaired columns, the key point is to simulate the original and unrepaired damage in the repaired columns. However, the damage for individual elements is
Numerical Modeling of Earthquake-Damaged Circular Bridge Columns Repaired Using Combination of Near-Surface-Mounted BFRP Bars with External BFRP Sheets Jacketing Xing-Gui Zeng, 1, 2 Shao-Fei Jiang, 3, * Xin-Cheng Xu, ...
expansion of the structural steel in the vicin-ity of the ﬁ re, the assembly will perform bet-ter and is considered to be restrained. There is a table contained within the ASTM E119 standard (Table X3.1) that gives guidance in evaluating if an assembly is restrained or unrestrained. If steel beams are welded, riveted, or bolted to other steel
REPAIR OF PRE-LOADED R.C. COLUMNS USING EXTERNAL CFRP SHEETS AND EMBEDDED LONGITUDINAL STEEL REINFORCEMENT ALAA M. MORSY* and EL-TONY M. EL-TONY** *Construction & Building Engineering Department, College of Engineering & Technology, Arab Academy for Science, Technology and Maritime Transport, Egypt.
Professor Background Research Interests Publications Teaching Contact Background Professor Shamim Sheikh’s current research is in the areas of seismic resistance of concrete structures and the use of fiber reinforced polymers as a replacement for steel to develop corrosion-free concrete structures. Steel corrosion is one of the biggest drains on the economy and our infrastructure resources ...
For circular steel columns, an additional thin layer of steel confinement is provided at the bottom of the pier to restrain the progress of out-of-plane deformation after local buckling. However, in the mean time, the tentative design specifications suggest filling steel bridge piers with concrete for reconstruction and repair.
corrugated steel jacket. The behavior of the strengthened or repaired square columns was investigated experimentally on twenty seven real concrete column models. Response of the columns before and after being strengthened or repaired with steel jackets was examined. Four variables were considered in this experimental study;
Apr 30, 2018 · This columns are thus isolated and their foundations are referred to as pad. These kind of footings are generally square or rectangular or circular in shape which are provided under each column independently. Flat or Footing is one of the Shallow Foundation. It is circular, square or rectangular slab of uniform thickness.
been damaged at different damage level and were repaired using the newly proposed concrete repair technique by using SSTT. The repaired reinforced concrete columns were retested under axial load. The test results show that the load carrying capacity and the ductility of repaired columns were improved significantly at cer-tain levels of damage.
Push-out test on the interface bond-slip behavior and calculation on bond strength between steel tube and recycled aggregate concrete in RACFST structures Chen Zongping1,2 Xu Jinjun1 Xue Jianyang1 Su Yisheng1,2(1.Guangxi University,Nanning 530004,China; 2.Key Laboratory of Disaster Prevention and Structural Safety of the Ministry of Education ...
This paper presents the test results of fire-exposed concrete-filled steel tubular (CFST) beam columns repaired by unidirectional carbon fibre reinforced polymer (CFRP) composites.
Closure To Discussion On "Repair And Rehabilitation Of Concrete Structures Using Confinement: A Review" By Chau-Khun Ma, Nazirah Mohd Apandi, Sofrie Chin Siew Yung, Ng Jen Hau, Lo Wen Haur, Abdullah Zawawi Awang, Wahid Omar [Construction And Building Materials 133 (2017) 502-515]
In an experimental and analytical study on the mechanical behavior of circular steel–concrete composite stub columns, 13 specimens were tested. To examine different mechanical behaviors of the columns, three loading conditions were studied.
Strengthening steel structures using carbon fiber reinforced polymer (CFRP) has attracted the attention of many researchers in recent years. Most previous research in this area has carried out on the behavior of the steel members without deficiency in bending, shear, and compression.
An experimental study was conducted to evaluate the compressive behavior of damaged circular hollow section (CHS) steel columns repaired by carbon fiber-reinforced polymer (CFRP) or high-strength grout.
Kou kouzou rombunshuu Vol. 18(2011) No. 72 Cyclic flexural behavior of thickness-reduced steel pipe repaired by welded patch plate Kazuo FURUNISHI, Yasuo KITANE, Naohiko WATANABE, Yoshito ITOH
Emergency repair of severely damaged reinforced concrete columns using active confinement with shape memory alloys. Moochul Shin and Bassem Andrawes. Published 25 May 2011 • IOP Publishing Ltd Smart Materials and Structures, Volume 20, Number 6
Field and Lab performance of Bridge Columns Repaired with Wrapped GFRP sheets (Shamim A. Sheikh), 2007. Investigation of Glass-Fibre-Reinforced-Polymer shells as Formwork and Reinforcement for Concrete Columns (Shamim A. Sheikh, S.A.D. Jaffry, and Ciyan Cui), 2007
and ductility of reinforced concrete slab column connection subjected to cyclic load and strengthened with steel shear bolts. The study has been shown that shear bolts reinforcement in flat reinforced concrete slabs can substantially increase the strength and ductility of the slab-column connection. Post-peak
Dr. Jim Nau joined the Department of Civil, Construction, and Environmental Engineering in 1982 after receiving his Ph.D. degree from the University of Illinois at Urbana-Champaign. At the undergraduate level, he teaches statics, solid mechanics, reinforced concrete design, structural steel design, and the senior design project course.
behavior in circular and rectangular RC columns. Elsanadedy and Haraoun (2005) conducted an analytical study to predict the behavior of poor lap splices in circular bridge columns retrofitted with FRP jackets and proposed a retrofit design criteria. Harries et al. (2006) experimentally investigated the retrofit of poorly detailed lap splices in
After testing, the specimens were repaired using high performance fiber reinforced concrete (HPFRC) jacket, all around the joint column regions, and retested up to failure. Higher load levels were attained, more ductile behavior was achieved, substantial energy dissipation was observed, slower stiffness degradation was also noted.
Dec 18, 2015 · Repairs for the severely damaged columns used headed reinforcement, mechanical couplers, and newly cast concrete. The moderately damaged column was repaired by cover replacement and epoxy injection. The success of each scheme was evaluated by comparing the behavior of the repaired column with that of the original column as well as the repair ...
This webinar presents a new method to reinforce square concrete columns with steel equal angle (SEA) sections and aims to provide insight into the results of an experimental investigation, on the behaviour of square High Strength Concrete (HSC) columns reinforced longitudinally with either steel bars or Steel Equal Angle (SEA) sections under ...
systems. Therefore, the study of the behavior of columns strengthened with FRP sheets is a discussing topic which requires more research specially in slender columns. The strengthening of slender concrete columns using high modulus bonded longitudinal laminates have been investigated by Sadeghian et al. (2015) using a numerical approach.
RETROFITTING AND STRENGTHENING OF REINFORCED….. 567 Tied stirrups were chosen to confine the original rectangular and square columns meanwhile, either closed loop or spiral stirrups used with circular columns. Steel jackets used for
Repair of Fire-exposed Preloaded Rectangular Concrete Columns by Post-4 . compressed Steel Plates 5 . 6 Lu Wang. 1, Ray Kai-Leung Su. 2. 7 . 8 . 9 . Abstract 10 This paper describes aal study n experiment axialofly loaded, fire-exposed, rectangular reinforced 11 concrete (RC) columns repaired with -compressed spost teel plates.
Methods of Concrete Column Repair for Damages and Cracks Columns may be repaired by using one or more of the following methods: Encasement or enlargement of the column cross section (jacketing). Cathodic protection to stop reinforcing steel corrosion. Re
An experimental program is conducted in this research to investigate the influence of basalt fibers and steel fibers on the flexural behavior of RC beams. Reinforced concrete beams are constructed using steel fiber concrete and basalt fiber concrete.
FRP FOR EARTHQUAKE DAMAGED STRUCTURES - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online.
TY - JOUR T1 - Behavior of eccentrically loaded double circular steel tubular short columns filled with concrete AU - Ahmed, Mizan AU - Liang, Qing Quan AU - Patel, Vipulkumar Ishvarbhai AU - Hadi, Muhammad N.S. PY - 2019
This paper describes the varying material model, the analysis method and the software development for reinforced concrete circular columns confined by spiral or hoop transverse steel reinforcement ...
Behavior of partially defected R.C columns strengthened using steel jackets Ahmed Shaban Abdel-Hay *, Yasser Abdel Ghany Fawzy Structural Engineering Dept., Faculty of Engineering, Beni-Suef University, Egypt
Strength and ductility behavior of circular concrete columns reinforced with GFRP bars and helices Abstract Long-term durability is a concern for Reinforced Concrete (RC) structures. Instances of premature deterioration of concrete structures due to corrosion of
through laboratory tests; (2) to propose design guidelines for the corrosion damaged RC columns repaired by FRP sheet wrapping based on the obtained test results. RESEARCH SIGNIFICANCE Although the effectiveness of the repair/rehabilitation of RC columns by CFRP sheet wrapping has been widely investigated, the information on the long-term behavior
This paper addresses the evaluation of the efficiency of a FRP jacket with an innovative joining system and the behavior of damaged concrete columns repaired with jackets considering several parameters, that is, level of steel corrosion, level of concrete cover damage, and the shape effect.
In the recent years, a lot of researches have been done on how using FRP laminates affect the behavior of the concrete joints. There are also considerable experimental studies on the seismic parameters of the upgraded or repaired connections. (Lee et al., 2002) investigated the effect of the simultaneously using of carbon and glass composites.