Behaviour of hollow circular section with multiple perforations under compression, flexure and torsion

Peen, Woo Yian; Choong, Kok Keong; Hassanshahi, Omid

doi:10.1590/1679-78255387

Cited by 8 publications

(4 citation statements)

References 11 publications

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“…This is mainly due to the prevailing belief that NSM FRP laminates are ineffective in compression, as highlighted by Fib Bulletin 14 [13], which states that the compression elasticity modulus of FRP is lower than its stress module. This perception has hindered the widespread utilization of NSM FRP laminates for enhancing the strength of concrete columns [14], [15]. These findings are in line with the guidelines put forth by ACI 440.2R [16] According to reports, it is not recommended to utilize FRP systems as a means to enhance compressive strength.…”

Section: Introductionmentioning

confidence: 74%

Assessment of Composite Bars and FRP Panels for Seismic Bridge Decks

Bakhtiari,

Harati

2023

jcer

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Seismic Strengthening offers a cost-effective and sustainable solution for constructing bridges in seismic zones. In these rehabilitation interventions, Fiber Reinforced Polymer (FRP) composites are often used instead of steel members due to their lightweight nature, high strength, and excellent corrosion resistance. Researchers are now focusing on creating innovative FRP-concrete hybrid structures. This study specifically investigates the numerical modeling of the response of a hybrid FRP-concrete jacket bridge pier subjected to quasi-static tests. The Finite Element Method (FEM) results demonstrated a significant correlation with the experimental response, particularly in terms of the load-displacement curve failure mode. Once the model was validated, various alternative designs were numerically tested to evaluate the impact of each model on the load-bearing capacity. These designs included altering the height of the CFRP sheet, adjusting the height and congestion of the CFRP bar, and comparing the performance of the concrete jacket with and without the CFRP sheet. After reinforcing the CFRP sheets and incorporating Near-Surface-Mounted (NSM)-CFRP bars, the reinforcement system, along with the new concrete jacket, effectively transferred the integrity of the broken pier area and maintained a constant load-bearing capacity for the bridge pier. However, when the CFRP sheet was added to the aforementioned system, the load capacity of the bridge pier increased by more than 60%. Therefore, it can be concluded that seismic enhancement techniques utilizing CFRP sheets and mounted NSM-CFRP bars are successful in enhancing the strength and resilience of the concrete bridge pier.

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Section: Introductionmentioning

confidence: 74%

Assessment of Composite Bars and FRP Panels for Seismic Bridge Decks

Bakhtiari,

Harati

2023

jcer

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“…The production of pebble blocks is such that first the items forming each pebble block (cluster) are produced together and the relative position of the items forming each pebble cluster remains constant during the simulation, unless the satisfaction failure criterion in this case, the spheres forming the cluster are separated from each other, and in this way, the simulation of particle failure is performed in this method. In order to simulate failure and create this capability in PFC3D software [32,33], the necessary subroutines in the FISH programming language (FISH) were added to the main coding software and added to it. For every 100 cycles of simulation, these subroutines are called and executed.…”

Section: Model Used For Gravel Materialsmentioning

confidence: 99%

Three-dimensional simulation of granular materials by discrete element method (DEM) by considering the fracture effect of particles

Mahboob,

Hassanshahi,

Sarabi Tabrizi

2023

jcer

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Coarse-grained materials, such as sand and gravel, exhibit a significant dependence on particle failure rate, which greatly influences their engineering behavior. This research focuses on the three-dimensional modeling of grain material behavior using the discrete element method (DEM) with PFC3D software and FISH programming language. The specific objective is to model the particle breakage phenomenon and its impact on resistance behavior and deformation. To accurately represent the non-spherical shape of the particles, an interconnected sphere approach was employed. The modeling of grain failure was achieved by establishing a failure criterion that considers two critical conditions: the heterogeneity of contact forces and stress within the particle. The proposed model and criteria were validated through comparison with triaxial experimental results obtained from the Purulia dam gravel. The results demonstrate that the developed model successfully captures the essential aspects of particle failure and its influence on the behavior of the granular environment. The simulations accurately represent the resistance behavior and deformation characteristics observed in the triaxial experiments. This validates the effectiveness of the proposed model in simulating the significant effects of particle failure on the behavior of coarse-grained materials. The findings of this study contribute to a deeper understanding of the complex behavior of coarse-grained materials, particularly in terms of their response to particle failure. The developed DEM model, incorporating the particle breakage phenomenon, provides a valuable tool for accurately predicting and analyzing the behavior of granular materials in various engineering applications.

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“…Such a lateral advantage might operate in electrical or mechanical management. HCS is mostly used as surface or roof deck systems but may also be used as members, partition sections, and bridge deck elements [7,8]. Including beams in the hollow slab reduces the dead load compared to a flat slab, the HCS is effective.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Performance of Hollow Core Slabs (HCS)-Concrete and Simplifying Their Implementation

Mahboob¹,

Hassanshahi²,

Hakimi³

et al. 2023

Recent Prog Mater

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The largest proportion of the material used in multistory buildings, and thus its carbon impact, is attributed to their slabs being the main contributor of weight. Because of their high strength and concrete self-weight reduction, composite beams with hollow-core slabs were created for their technical and economic benefits, making this system inexpensive and with a reduced environmental impact, thereby lowering carbon emissions. Geometrically, the hollow slab has a sequence of T and L form pieces on both sides. Hollow slabs are a newer roof feature with a little study undertaken in mechanical characteristics that prove its benefits and downsides in construction. It also has sufficient rigidity. In this work, numerous 19 hollow slabs and flat slabs are modeled using the finite element method, and the findings are compared in terms of hollow slab behavior and economic cost. It demonstrates that reducing the concrete beneath the hollow slab promotes cost-efficiency and the effective use of concrete and steel resources and various approaches for this form of the hollow slab are provided. Implementing a modern double-side beam slab is possible using the presented methods in this paper. It opens a door for creating structures with high stiffness and strength versus vertical and lateral load, along with low material volume.

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Behaviour of hollow circular section with multiple perforations under compression, flexure and torsion

Cited by 8 publications

References 11 publications

Assessment of Composite Bars and FRP Panels for Seismic Bridge Decks

Assessment of Composite Bars and FRP Panels for Seismic Bridge Decks

Three-dimensional simulation of granular materials by discrete element method (DEM) by considering the fracture effect of particles

Evaluating the Performance of Hollow Core Slabs (HCS)-Concrete and Simplifying Their Implementation

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