Serviceability of Post-fire RC Rafters with Openings of Different  Sizes and Shapes

Abdulkareem, Bashar F.; Izzet, Amer F.

doi:10.31026/j.eng.2022.01.02

Cited by 10 publications

(5 citation statements)

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“…The porosity of solid cement paste decreases when it is dried, and water evaporates from the particles [11]. These groups were separated based on the temperature range chosen for the heating exposure (ambient, 400, and 700°C) [12].…”

Section: Performance Of Concrete In Firementioning

confidence: 99%

Experimental Studies on the Fire Flame Behavior of Reinforced Concrete Beams with Construction Joints

Abbood,

Kharnoob

2023

E3S Web Conf.

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This study was experimentally investigated experimentally, investigating the effect of such mechanical properties and deflection behavior on the performance of reinforced concrete beams with construction joints exposed to fire flame. These beams were built using a slanted connection at a 45° angle in the middle of the beams. Four beams were for a wide temperature range (25–800°C) for the fire flames used on the concrete beams. Two temperature levels (600°C and 800°C) were chosen, with (1 and 2) hrs. period time, respectively. One beam wasn't burnt (Reference specimen). When put through a fire, flexural strength drastically decreased. The experimental program's results suggested the worst effect on construction joint beam for temperature 800°C with 2 hrs. period time because that heating reduces the bonds between two surfaces in the joint and makes like slip and disconnect between the joint after exposure to load. After 1 and 2 hours in a fire at 600°C, the residual flexural strength was 85% and 72%, respectively, whereas, after 1 and 2 hours in a fire at 800°C, it was 41% and 28%, this is showed that the stiffness of beam its decrease when exposed to fire flam with raising temperature and time and increase the deformation by cracks that appear on the beams. It was noticed that the load-deflection relation to beams exposed to fire flame is flat, representing softer load-deflection behavior than that of the control beam.

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Section: Performance Of Concrete In Firementioning

confidence: 99%

Experimental Studies on the Fire Flame Behavior of Reinforced Concrete Beams with Construction Joints

Abbood,

Kharnoob

2023

E3S Web Conf.

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“…Insertion openings in this type of beam have various advantages, including arithmetic flexibility, ease of shipment, and the construction of a structure where service pieces of machinery can pass during the web of beams, and, most importantly, the decrease in overall weight. Concrete is also relatively inexpensive and has good fire resistance (Abdulkareem et al, 2022). It's also low-maintenance to support the roofs of warehouses, industrial facilities, and aeroplane hangars instead of steel parts (Hassan et al, 2019a;Alkhafaji et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

3D- ABAQUS Modelling of Prestressed Concrete Hunched Beams with Multi-Openings of Different Shapes

Al-Hilali,

Izzet

2023

jcoeng

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A long-span Prestressed Concrete Hunched Beam with Multi-Opening has been developed as an alternative to steel structural elements. The commercial finite element package ABAQUS/CAE version 2019 has been utilized. This article has presented the results of three-dimensional numerical simulations investigating the flexural behaviour of existing experimental work of supported Prestressed Concrete Hunched Beams with multiple openings of varying shapes under static monotonic loads. Insertion openings in such a beam lead to concentrate stresses at the corners of these openings; as a result, extensive cracking would appear. Correlation between numerical models and empirical work has also been discussed regarding load displacement and crack development, and the obtained outcomes demonstrate a good agreement with the experiments. The ratio of ultimate loads and deflection of the beams tested in the investigation to those of numerical models was 0.98 and 0.97, respectively. So, finite element analysis can be regarded as a behaviour-trustworthy technique for simulating the non-linear behaviour of prestressed concrete rafters with multi-openings from the point of view of complexity, hardly, time-keeping, human effort, and cost.

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“…During the last three decades of the previous century, the utilisation of carbon fibre-reinforced polymer (CFRP) composites for strengthening reinforced concrete (RC) structures has emerged as a highly promising technology to address the rehabilitation of infrastructure. CFRP strengthening can be used in various ways, including to build new buildings and fix old ones [1][2][3]. In addition to analysing the general failure criterion of CFRP-RC beams, other researchers have focused on the local behaviour at the bond interface.…”

Section: Introductionmentioning

confidence: 99%

Shear Performance of Reinforced Concrete T Beams Strengthened by Carbon Fiber-Reinforced Polymer Bars

Alhilli,

Al-Farttoosi

2023

Civ Eng J

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The primary purpose of this work is to investigate the shear response of T-reinforced concrete beams strengthened for shear using the embedded through section (ETS) technique when subjected to a monotonic one-point load till failure. The experimental approach included an examination of the twelve reinforced concrete T-beams, including two reference beams without any strengthening and ten strengthened beams. The twelve beams were divided into two main groups, with and without stirrups. The main variables in every group were the spacing and angle of inclination of the carbon fibre-reinforced polymer (CFRP) bars. The beams were strengthened in shear with CFRP bars inserted in the centre line of the section with different spacings and angles of inclination. The experimental analysis was performed to study the effect of spacing and angle of inclination of the CFRP bars on the ultimate load capacity, load-strain relationships, and load-deflection relationships. Results showed that the ultimate load of the beams in group one with inclined CFRP bars (45°) increased by 29.7, 22.4, and 15.5% for beams with CFRP bar spacings of 10, 15, and 20 cm, respectively, compared with the reference beam. In group one (with stirrups), the beam with inclined CFRP bars (45°) and a spacing of 10 cm has an ultimate load higher than that with vertical CFRP bars (90°) with a similar spacing by 2.6%. By contrast, the beam with inclined CFRP bars (45°) and a spacing of 10 cm in group two (without stirrups) has an ultimate load higher than that with vertical CFRP bars (90°) with a similar spacing by 2.5%. Doi: 10.28991/CEJ-2023-09-10-04 Full Text: PDF

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Serviceability of Post-fire RC Rafters with Openings of Different Sizes and Shapes

Cited by 10 publications

References 0 publications

Experimental Studies on the Fire Flame Behavior of Reinforced Concrete Beams with Construction Joints

Experimental Studies on the Fire Flame Behavior of Reinforced Concrete Beams with Construction Joints

3D- ABAQUS Modelling of Prestressed Concrete Hunched Beams with Multi-Openings of Different Shapes

Shear Performance of Reinforced Concrete T Beams Strengthened by Carbon Fiber-Reinforced Polymer Bars

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