Efficiency of CFRP torsional strengthening technique for L-shaped spandrel reinforced concrete beams

Noor Ayaad; Nazar K. Oukaili

doi:https://doi.org/10.1515/jmbm-2022-0243

Details

Publication Date

Sun Jan 01 2023

Journal Name

Journal Of The Mechanical Behavior Of Materials

Volume

32

Issue Number

1

DOI

https://doi.org/10.1515/jmbm-2022-0243

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Efficiency of CFRP torsional strengthening technique for L-shaped spandrel reinforced concrete beams

L-shaped spandrel beams

CFRP strengthening

shear and torsion stresses

load–rotation angle response

Noor Ayaad

Nazar K. Oukaili

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AbstractThe present study aims to get experimentally a deeper understanding of the efficiency of carbon fiber-reinforced polymer (CFRP) sheets applied to improve the torsional behavior of L-shaped reinforced concrete spandrel beams in which their ledges were loaded in two stages under monotonic loading. An experimental program was conducted on spandrel beams considering different key parameters including the cross-sectional aspect ratio (<italic>i.e.</italic>, web height/web thickness), and the availability of the CFRP strengthening system. The ledge of the spandrel beams was exposed during testing to a very high eccentric load, which was transferred to the web of the spandrel beam causing high shear, torsion, and bending moments. Consequently, the applied load resulted in in-plane and out-of-plane deformations of the web accompanied by flexural and shear cracks. This article demonstrates the advantage of using CFRP sheets to strengthen the mentioned members. The applied CFRP sheets increased the failure torsional load by about 37% compared to the identical L-spandrels without strengthening. The outcomes indicate that using CFRP sheets show improvement in restricting the deflections and rotation of L-spandrels due to increasing spandrel stiffness. The reduction in the degree of rotation attained more than 33% in comparison to the spandrel beams without strengthening. The experimental program confirmed the applicability of the proposed strengthening technique for compacted and slender L-shaped spandrel-reinforced concrete beams.

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Publication Date

Mon Jul 01 2024

Journal Name

Journal Of Food Process Engineering

Artificial intelligence‐based modeling of novel non‐thermal milk pasteurization to achieve desirable color and predict quality parameters during storage

Ali Wali M.

Asaad R.

Azhar J.

Mohsen

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Abstract<sec><label></label>This study proposed using color components as artificial intelligence (AI) input to predict milk moisture and fat contents. In this sense, an adaptive neuro‐fuzzy inference system (ANFIS) was applied to milk processed by moderate electrical field‐based non‐thermal (NP) and conventional pasteurization (CP). The differences between predicted and experimental data were not significant (<italic>p</italic> > 0.05) for lightness (<italic>L</italic>*), redness‐greenness (<italic>a</italic>*), yellowness‐blueness (<italic>b</italic>*), total color differences (∆<italic>E</italic>), hue angle (<italic>h</italic></sec> ... Show More

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(5)

Publication Date

Sun Dec 01 2019

Journal Name

Regenerative Therapy

In vitro periodontal ligament cell expansion by co-culture method and formation of multi-layered periodontal ligament-derived cell sheets

Keywords: Collagen graft

Mesenchymal stem cells

Periostin

Isolation PDL

Scaffold

Three-dimension culture

Ihab Nabeel

Basima

Ahmed Majeed

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Objective: Per-implantitis is one of the implant treatment complications. Dentists have failed to restore damaged periodontium by using conventional therapies. Tissue engineering (stem cells, scaffold and growth factors) aims to reconstruct natural tissues. The paper aimed to isolate both periodontal ligament stem cells (PDLSCs) and bone marrow mesenchymal stem cells (BMMSCs) and use them in a co-culture method to create three-layered cell sheets for reconstructing natural periodontal ligament (PDL) tissue. Materials and methods: BMMSCs were isolated from rabbit tibia and femur, and PDLSC culture was established from the lower right incisor. The cells were co-cultured to induce BMMSC differentiation into PDL cells. Cell morphology, stem cel

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Publication Date

Mon Apr 06 2020

Journal Name

Asian Journal Of Civil Engineering

Integrated project delivery (IPD) method with BIM to improve the project performance: a case study in the Republic of Iraq

Ahmed Mohammed Raoof

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Publication Date

Tue Mar 28 2017

Journal Name

Archives Of Polish Fisheries

Meristic character variability among populations of Silurus triostegus Heckel, 1843 from the Euphrates, Tigris, and Shatt al-Arab Rivers, Iraq

Laith A.

Alessandro

MUHAMMAD I.

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AbstractVariation in the numbers of pectoral fin spines and rays, pelvic fin rays, gill rakers on the first gill arch, anal fin rays, and the number of vertebrae of Silurus triostegus Heckel were examined in specimens from 16 localities that span its entire distribution range in the Tigris, Euphrates, and Shatt al-Arab rivers in Iraq. The mean number of the six meristic traits increases toward high latitudes with maximum and minimum values in the north and south of Iraq. Based on cluster analysis and PCA, the Mesopotamian river samples were clearly separated into three distinct groups. The upper Tigris populations were isolated from those of the middle and southern populations of this river and from those of ... Show More

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(9)

Publication Date

Wed Jun 20 2018

Journal Name

Bulletin Of Iraq Natural History Museum

GENOTYPE VERSUS PHENOTYPE TO DETERMINE THE DEFINITIVE IDENTIFICATION OF THE GENERA CHLORELLA BEIJERINCK, 1890 (CHLORELLACEAE) AND COELASTRELLA CHODAT, 1922 (SCENDESMACEAE)

Ghoson

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Publication Date

Mon Apr 01 2024

Journal Name

Egyptian Journal Of Basic And Applied Sciences

Exon 2 variants (rs3811046 and rs3811047) of the IL37 gene are associated with susceptibility to systemic lupus erythematosus

Rawan A.

Adnan A.

Ali H.

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Publication Date

Sun Jul 01 2018

Journal Name

Bulletin Of The Iraq Natural History Museum (p-issn: 1017-8678 , E-issn: 2311-9799)

GENOTYPE VERSUS PHENOTYPE TO DETERMINE THE DEFINITIVE IDENTIFICATION OF THE GENERA CHLORELLA BEIJERINCK, 1890 (CHLORELLACEAE) AND COELASTRELLA CHODAT, 1922 (SCENDESMACEAE)

Coccoid green algae

Coelastrella

Genotype

New record

Phylogenetic tree.

Ibrahim J.

Ghusoon A.

Ali M.

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Conventional identification of three coccoid green algae isolates was attempted to characterize the studied algae morphologically under compound microscope, which demonstrated confusional phenomenal convergence; all were classified microscopically as the green alga Chlorella vulgaris Beijerinck, 1890.

Phylogenetic studies were conducted to settle the argument about the phenotype by studying the genotype. Genotype the promising field in advance classification by using 18S rRNA and compared to GenBank database using to search the related sequences. The determined sequences showed high a similarity to the strains registered in GenBank.

&

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(10)

(4)

Publication Date

Tue Dec 31 2019

Journal Name

Journal Of Engineering

The Effect of Total Suspended Solids on the Electricity Generation in Microbial Fuel Cell Treating Actual Potato Chips Processing Wastewater

Microbial fuel cell

total suspended solids

potato chips processing wastewater

energy generation

Zainab z.

Ahmed Yasir

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This study aimed to investigate the effect of total suspended solids (TSS) on the performance of a continuously operated dual-chamber microbial fuel cell (MFC) proceeded by primary clarifier to treat actual potato chips processing wastewater. The system was also tested in the absence of the primary clarifier and the results demonstrated a significant effect of TSS on the polarization curve of the MFC which was obtained by operating the graphite anodic electrode against Ag/AgCl reference electrode. The maximum observed power and current densities were decreased form 102.42 mW/m² and 447.26 mA/m² to 80.16 mW/m² and 299.10 mA/m², respectively due to the adverse effect of TSS. Also

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(5)

Publication Date

Thu May 02 2013

Journal Name

Al-mustansiriyah

Synthesis, Spectroscopic and Biological Studies of a New some Complexes with N-Pyridine-2-Y1 methyl-benzene-1, 2-diamine.

Shaimaa

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Publication Date

Fri Dec 19 2014

Journal Name

Al-mustansiriyah

Synthesis, Spectroscopic and Antibacterial Studies of N (2-amino phenyl)-N-((pyridine-2-yl) methyl) Benzene-1, 2-Diamine Complexes

Shaimaa

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