Impact behavior of rehabilitated post-tensioned slabs previously damaged by impact loading

Baalbaki, Oussama; Darwiche, Mohamad; Chaaban, Sandy; Jahami, Ali; Temsah, Yehya; Khatib, Jamal

doi:10.18720/mce.93.11

Cited by 6 publications

(3 citation statements)

References 13 publications

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“…This wider aim of this research is to study the effect of adding waste plastic straw (WPS) fibers on the structural performance of reinforced concrete beams. Future research will attempt to examine the effect this type of fibers on the behavior of reinforced concrete beams and slabs when subjected to dynamic and impact loads [24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Structural Assessment of Reinforced Concrete Beams Incorporating Waste Plastic Straws

et al. 2020

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The behavior of reinforced concrete beams containing fibers made of waste plastic straws (WPSs) under the three point bending test is examined. The effect of WPS fiber addition on the compressive and split tensile strength is reported. Four concrete mixes were prepared. The control mix PS-0 had a proportion of 1 cement: 1 sand: 2 coarse aggregate and a water cement ratio of 0.4. In the other three mixes PS-0.5, PS-1.5 and PS-3, 0%, 0.5%, 1.5% and 3% of WPS fiber (by volume) was added respectively. The results show that at 0.5% WPS, there is slight increase in compressive strength. However, beyond 0.5% addition, a decrease in compressive strength is observed. The split tensile strength shows a systematic increase with the addition of WPS fibers. The reinforced concrete beams containing WPS fibers show higher ductility as demonstrated by the larger ultimate tensile strain and ductility index (Δu/Δy). There is a tendency to have more fine cracks with the presence of WPS fibers.

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Section: Introductionmentioning

confidence: 99%

Structural Assessment of Reinforced Concrete Beams Incorporating Waste Plastic Straws

et al. 2020

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“…Reference [2]: This research aimed to study the efficiency of shear reinforcement as rehabilitation techniques for PT "post-tensioned" slabs damaged by falling rocks. Two simply supported PT slabs were considered in this study.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Structural Performance of Single Span Hollow Core Slab under Successive Impact Loading

Chebo

Temsah

Saleh³

et al. 2022

Materials

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In Lebanon and many other countries where structures are vulnerable to impact loads caused by accidental rock falls due to landslides, specifically bridges with hollow core slab, it is mandatory to develop safe and efficient design procedures to design such types of structures to withstand extreme cases of loading. The structural response of concrete members subjected to low velocity high falling weight raised the interest of researchers in the previous years. The effect of impact due to landslide falling rocks on reinforced concrete (RC) slabs has been investigated by many researchers, while very few studied the effect of impact loading on pre-stressed structures, noting that a recent study was conducted at Beirut Arab University which compared the dynamic behavior of reinforced concrete and post-tensioned slabs under impact loading from a 605 kg impactor freely dropped from a height of 20 m. Hollow core slabs are widely used in bridges and precast structures. Thus, studying their behavior due to such hazards becomes inevitable. This study focuses on these types of slabs. For a better understanding of the behavior, a full scale experimental program consists of testing a single span hollow core slab. The specimen has 6000 mm × 1200 mm × 200 mm dimensions with a 100 mm cast in a place topping slab. Successive free fall drops cases from 14 m height will be investigated on the prescribed slab having a span of 6000 m. This series of impacts will be held by hitting the single span hollow core slab at three different locations: center, edge, and near the support. The data from the testing program were used to assess the structural response in terms of experimental observations, maximum impact and inertia forces, structural damage/failure: type and pattern, acceleration response, and structural design recommendations. This research showed that the hollow core slab has a different dynamic behavior compared to the post tensioned and reinforced concrete slabs mentioned in the literature review section.

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“…The impact test was performed following the repairs, and both punched shear capacity and normal stresses were measured 26 . The explosion in Beirut on August 4, 2020, is regarded as a case study in a structural engineering technique using nonlinear computational finite element modeling of the silos.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on existing RC circular section members under unequal impact collision

Liu

Al-Bukhaiti

Zhao

et al. 2022

Sci Rep

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Traffic accidents and derailed train-related incidents have occurred more often than ever in recent years, resulting in some economic damage and casualties. Reinforced concrete (RC) constructions often involve derailed train and vehicle accidents. Rarely are such side collisions studied in previous studies. To do this, high-fidelity simulation-based finite-element (FE) models are created in this paper to accurately simulate the collision of circular RC members with a derailed train. The reinforced concrete member structure is common in high-speed railway stations. The impact energy of the impact body is significant, causing structural member failure. It analyses the dynamic behavior of reinforced concrete members under unequal span impact loads. Numerical implementations of impact issues are discussed from the perspective of geometric, contact, and material properties. The reliability and precision of the ABAQUS code to solve impact issues are verified by comparing failure modes, impact, and deflection time history experimental outputs. By analysing the impact response characteristics, used the control variables to study the failure process and mode (including the characteristics of impact and reaction forces, deflection time history curve, impact force–deflection curve, and bearing reaction force–deflection curve). The reinforcement ratio, impact velocity, concrete strength, and slenderness ratio significantly affect shear crack pattern and development. Changes in impact velocity and slenderness ratio also affect member failure modes.

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Impact behavior of rehabilitated post-tensioned slabs previously damaged by impact loading

Cited by 6 publications

References 13 publications

Structural Assessment of Reinforced Concrete Beams Incorporating Waste Plastic Straws

Structural Assessment of Reinforced Concrete Beams Incorporating Waste Plastic Straws

Experimental Investigation on the Structural Performance of Single Span Hollow Core Slab under Successive Impact Loading

Numerical study on existing RC circular section members under unequal impact collision

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