Experimental and Numerical Studies on Efficiency of Hybrid Overlay and Near Surface Mounted FRP Strengthening of Pre-cracked Hollow Core Slabs

Kankeri, Pradeep; Prakash, Shamsher; Pachalla, Sameer Kumar Sarma

doi:10.1016/j.istruc.2018.05.003

Cited by 24 publications

(3 citation statements)

References 23 publications

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“…Беннегади [13], исследовали методы усиления многопустотных плит на основе композитов. Напряженное и деформированное состояние железобетонных плит с предварительно напрягаемой арматурой представлено в исследованиях П. Канкери [14], Аль-Негхаймиш [15], В. Альберо [16]. В работе Канкери большое внимание уделялось усилению многопустотных плит после образования трещин в бетоне.…”

Section: строительные конструкции здания и сооруженияunclassified

Numerical Study of Multi-Cavity Overlap Panels of Various Length

Vasilyev¹,

Plehanova²

2020

build

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Известно, что многопустотные панели для упрощения при расчетах представляют в форме двутавровых (тавровых) балок и считают по балочной теории. Однако такое представление тем не менее может искажать результаты расчетов. Цель данной работы-изучить, как форма поперечного сечения многопустотных панелей для образцов различной длины влияет на несущую и деформативную способность, а также на нагрузку начала трещинообразования. Рассматривались образцы панелей различных длин, свободно опертых и работающих на изгиб, с поперечным сечением в естественной форме, в сопоставлении с образцами аналогичных длин в двутавровой форме. На образцы последовательно прикладывалась нагрузка с шагом 1 кН до достижения предела текучести арматурой в растянутой зоне. Выполнено численное исследование многопустотных панелей в нелинейной постановке с образованием пластического шарнира в середине пролета. Получены графики нагрузкапрогиб при моделировании соответствующих длин образцов с естественной и двутавровой формой сечения. Получены и сопоставлены результаты для нагрузки появления трещин, прогибов в середине пролета при разрушающей нагрузке. Выяснено, что длина панели оказывает влияние на результаты расчетов рассматриваемых форм, и чем длина меньше, тем более ярко выражено отклонение в графиках нагрузка-прогиб. С увеличением длины образцов коэффициент корреляции растет и стремится к единице, что говорит об увеличении связи между графиками нагрузка-прогиб. Предложены поправочные коэффициенты для уточнения расчетов плит по образованию трещин, деформациям и разрушающим нагрузкам. Ключевые слова: многопустотные панели перекрытия, форма поперечного сечения, нагрузка образования трещин, разрушающая нагрузка, прогиб.

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Section: строительные конструкции здания и сооруженияunclassified

Numerical Study of Multi-Cavity Overlap Panels of Various Length

Vasilyev¹,

Plehanova²

2020

build

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“…Increasing the a/d ratio leads to decreasing the peak load of the uncracked HCS and decreasing its peak displacement. Also, using shear keys to connect a bonded overlay concrete layer to a pre-cracked HCS leads to increasing peak load and decreasing peak displacement [14]. Using steel anchors for connecting the topping concrete layer to precast prestressed HCS decreased the deflection and increased moment capacities and stiffness as it avoids slippage.…”

Section: Introductionmentioning

confidence: 99%

Structural behavior of Lightweight and High strength Layered Hollow Core Slabs

Ghamry

Esia

Aboul-Nour

2022

Frattura Ed Integrità Strutturale

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A new technique of Layered Hollow Core Slab (LHCS) has been used to obtain a slab with an optimum weight-to-strength ratio. Specimens with a 90 mm top layer of High Strength Concrete (HSC) and a 90 mm bottom layer of Lightweight Aggregate Concrete (LWAC) were examined. Nine full-scale slabs with dimensions of 1600* 450* 180 mm were tested under a 4-point loading test. The %core, a/d, RFT ratio, and connection method were the different studied parameters. A push-out test was conducted on triplet specimens to study the bond strength at the interface between HSC jacket and LWAC cubes using bond agent material or shear dowels, or without treatment, to determine which method of them is suitable for connecting the two layers of the tested slabs. Load, deflection, ductility, strain, crack pattern, and mode of failure were studied. The results indicate that ultimate strength is enhanced with decreasing a/d and %core and with an increasing RFT ratio of the LHCS specimens. Using shear dowels ensures an efficient bond between the two layers of the tested slabs. ANSYS program used for modelling the slab. The numerical study accepted the experimental data with a variation of less than 10% for all slabs.

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“…The appearance of scratches will usually require taking special measures to prevent further deterioration of the technical condition of the slabs by implementing appropriate reinforcement solutions. The strengthening can be performed on the slabs' upper surface, in the space of free channels or from the outside on the bottom surface [3,4,5]. Each of the solutions, if properly designed and documented by meeting the standard conditions, can be applied in such a case.…”

Section: Introductionmentioning

confidence: 99%

Reinforcement of cracked hollow-core slabs during the construction of the building

Szeląg¹

2022

iboa

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During the implementation of investment processes with the use of ready-made prefabricated elements, undesirable situations may occur that cause scratches, excessive deflections or damage. This is due to the fact that defects occur during transport, storage or incorrect loading of the elements. The conducted tests and technical assessments often allow the use of built-in elements, however, under the conditions of the need to make their reinforcements. This may be due to the scale of damage or defects made during molding and, as a consequence, the implementation of prefabricated elements with too low load capacity. Taking action each time should allow for the implementation of reinforcements of the elements, limiting the need to dismantle them, which would result in their irretrievable destruction. The implementation of reinforcements allows to reduce the generation of waste from new elements and allows for the proper management of already produced prefabricated elements. Used elements with reinforcements should be subject to technical inspection in the same periods as other structural elements. Proper implementation of repairs allows for the final effect to be similar to the parameters of elements free of technical defects. Due to the existing problem of damage to new elements of prefabricated channel ceilings, solutions have been developed that can be used to reinforce the elements without the need to dismantle them from the places of installation, while reducing the time spent on the process.

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Experimental and Numerical Studies on Efficiency of Hybrid Overlay and Near Surface Mounted FRP Strengthening of Pre-cracked Hollow Core Slabs

Cited by 24 publications

References 23 publications

Numerical Study of Multi-Cavity Overlap Panels of Various Length

Numerical Study of Multi-Cavity Overlap Panels of Various Length

Structural behavior of Lightweight and High strength Layered Hollow Core Slabs

Reinforcement of cracked hollow-core slabs during the construction of the building

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