Shear ductility of reinforced lightweight concrete beams of normal strength and high strength concrete

Ahmad, Shuaib H.; Xie, Yongchun; Yu, Tian Lai

doi:10.1016/0958-9465(94)00029-x

Cited by 40 publications

(26 citation statements)

References 3 publications

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“…e shear and exural de nition of ductility index μ consist of the ratio of the area of the load-de ection response. Shear ductility should only be measured on shear deformation [19].…”

Section: Fiber-cement Bondmentioning

confidence: 99%

“…Moreover, the lightweight reduced the dead load on buildings supported by low bearing capacity soil [17]. Also, the low weight and higher ductility of LWAFRC make structural members such as marine structures, slabs, joist, bridge girders, and bridge decks very desirable and cost e cient [19]. In addition, LWAFRC is increasingly being used in precast concrete structures, providing higher strength members and facilitating its transportation.…”

Section: Applicationsmentioning

confidence: 99%

“…Moreover, its lightweight characteristic makes this concrete useful in reducing the dead load on high-rise buildings, slabs, and joists, permitting a direct reduction in the foundation size, especially in soils with low bearing capacity [17]. In fact, the lightweight and higher ductility of lightweight aggregate ber-reinforced concrete make structural members such as marine structures, slabs, joists, bridge girders, and bridge decks both desirable and cost e cient [19]. In addition, lightweight aggregate ber-reinforced concrete is increasingly being used in precast concrete structures, providing higher strength members and facilitating transportation.…”

Section: Applicationsmentioning

confidence: 99%

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State-of-the-Art Report on Fiber-Reinforced Lightweight Aggregate Concrete Masonry

Rico

Farshidpour

Tehrani

2017

Advances in Civil Engineering

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Masonry construction is the most widely used building method in the world. Concrete masonry is relatively low in cost due to the vast availability of aggregates used within the production process. ese aggregate materials are not always reliable for structural use. One of the principal issues associated with masonry is the brittleness of the unit. When subject to seismic loads, the brittleness of the masonry magni es. In regions with high seismic activity and unspeci ed building codes or standards, masonry housing has developed into a death trap for countless individuals. A common approach concerning the issue associated with the brittle characteristic of masonry is addition of steel reinforcement. However, this can be expensive, highly dependent on skillfulness of labor, and particularly dependent on the quality of available steel. A proposed solution presented in this investigation consists of introducing steel bers to the lightweight aggregate concrete masonry mix. Previous investigations in the eld of lightweight aggregate ber-reinforced concrete have shown an increase in exural strength, toughness, and ductility. e outcome of this research project provides invaluable data for the production of a ductile masonry unit capable of withstanding seismic loads for prolonged periods.

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“…e shear and exural de nition of ductility index μ consist of the ratio of the area of the load-de ection response. Shear ductility should only be measured on shear deformation [19].…”

Section: Fiber-cement Bondmentioning

confidence: 99%

Section: Applicationsmentioning

confidence: 99%

Section: Applicationsmentioning

confidence: 99%

See 1 more Smart Citation

State-of-the-Art Report on Fiber-Reinforced Lightweight Aggregate Concrete Masonry

Rico

Farshidpour

Tehrani

2017

Advances in Civil Engineering

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“…에 의한 연구를 시점으로 여러 연구자 [7][8][9][10][11] 들에 의해 진행되고 있지만, 경량콘크리트 연속보의 전 단전달에 대한 골재맞물림 작용을 파악하기 위한 유용한 자료는 매우 부족하다.…”

Section: 서 론unclassified

Effect of Aggregate Size on the Shear Capacity of Lightweight Concrete Continuous Beams

Yang¹,

Mun²

2009

Journal of the Korea Concrete Institute

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Twenty-four beam specimens were tested to examine the effect of the maximum aggregate size on the shear behavior of lightweight concrete continuous beams. The maximum aggregate size varied from 4 mm to 19 mm and shear span-to-depth ratio was 2.5 and 0.6 in each all-lightweight, sand-lightweight and normal weight concrete groups. The ratio of the normalized shear capacity of lightweight concrete beams to that of the company normal weight concrete beams was also compared with the modification factor specified in ACI 318-05 for lightweight concrete. The microphotograph showed that some unsplitted aggregates were observed in the failure planes of lightweight concrete beams, which contributed to the enhancement of the shear capacity of lightweight concrete beams. As a result, the normalized shear capacity of lightweight concrete continuous beams increased with the increase of the maximum aggregate size, though the increasing rate was lower than that of normal weight concrete continuous beams. The modification factor specified in ACI 318-05 was generally unconservative in the continuous lightweight concrete beams, showing an increase of the unconservatism with the increase of the maximum aggregate size. In addition, the conservatism of the shear provisions of ACI 318-05 was lower in lightweight concrete beams than in normal weight concrete beams. 들에 의해 진행되고 있지만, 경량콘크리트 연속보의 전 단전달에 대한 골재맞물림 작용을 파악하기 위한 유용한 자료는 매우 부족하다.

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“…Numerous studies have provided very valuable information on the deformation and strength characteristics of shear-critical RC members of NWC concrete in addition to LWC concrete (Ahmad et al, 1994;Ahmad et al, 1995;Ramirez et al, 2004;Mphonde and Frantz, 1984;Elzanty and Nilson, 1986;Ahmad et al 1986;Salandra and Ahmad, 1989). On the other hand, these studies are limited to the maximum load stage and diagonal cracking as well as the post-peak deformation behavior of shearcritical RC members.…”

Section: Introductionmentioning

confidence: 97%

Satisfactory margin of safety against shear failure of lightweight reinforced concrete beams: 3D finite element modeling

Al-Rousan

2015

KSCE J Civ Eng

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In concrete structures a satisfactory margin of safety should be ensured against shear failure that might occur under the forces that act upon the structure during its lifetime. Therefore, knowledge of the design and construction guidelines for shear of normal and high strength Lightweight Concrete (LWC) beams is desirable to better understand the structural design and performance of LWC beams. Thus, research is required to address and investigate the contribution of concrete compressive strength, shear span to depth ratio, tensile reinforcement ratio, and shear stirrups spacing as well as the failure mechanisms in situation of using LWC beams. As a result, this paper presents Nonlinear Finite Element Analysis (NLFEA) results of reinforced LWC beams because of the main benefits of NLFEA by providing substantial savings in the cost, time, and effort compared with the fabrication and experimental testing of structure elements as well as the ability to change any parameter of interest and the capability of demonstrating any interesting behavior at any load value and at any location in the system. After reasonable validation of NLFEA with the experimental test results, the NLFEA was expanded to provide a parametric study of fourteen hundred LWC beams that correlates the ultimate shear stress to studied parameters. Results indicated that the lower bound was for the beams with shear span to depth ratio, concrete compressive strength, and tensile reinforcement ratio of 5, 27.5 MPa, and 0.71%, respectively, and the upper bound was for the beams with shear span to depth ratio, concrete compressive strength, and tensile reinforcement ratio of 1, 68.8 MPa, and 2.21%, respectively. In addition, the performance of simulated models was investigated in terms of ultimate load capacity, ductility and energy absorption. Finally, a new parametric model is introduced in this paper to compute the shear strength of reinforced LWC beams without stirrups. The proposed equation was compared with numerous previous analytical models and founded that some models to be in a good agreement.

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Shear ductility of reinforced lightweight concrete beams of normal strength and high strength concrete

Cited by 40 publications

References 3 publications

State-of-the-Art Report on Fiber-Reinforced Lightweight Aggregate Concrete Masonry

State-of-the-Art Report on Fiber-Reinforced Lightweight Aggregate Concrete Masonry

Effect of Aggregate Size on the Shear Capacity of Lightweight Concrete Continuous Beams

Satisfactory margin of safety against shear failure of lightweight reinforced concrete beams: 3D finite element modeling

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