The Effect of Topping on Hollow Core Slab Floor Plates on Comfort Criteria Due to Vibration by Human Activities

Due to the large increase in the use of precast concrete structures in multistory buildings, this work covers a study on the behavior of beam-column connection with emphasis on the continuity provided by the slab reinforcement. Two prototypes were tested, each one with a different detail of the continuity reinforcement distribution. In both connections, the steel area used on the concrete cover of the hollow core slab was the same, varying the amount of bars that passed through the column and the ones that were placed adjacent to the column. The experimental results showed that the connection with bars adjacent to the column presented stiffness increase and a better cracking control. According to the classification the two tested connections can be considered semi-rigid.

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Determination of reinforcing bars for tests of hollow core slabs with continuity

Revista IBRACON de Estruturas e Materiais ◽

10.1590/s1983-41952013000600005 ◽

2013 ◽

Vol 6 (6) ◽

pp. 903-932

Author(s):

A. P. Santos ◽

M. A. Ferreira ◽

R. C. Carvalho ◽

L. M. Pinheiro

Keyword(s):

Shear Strength ◽

The Other ◽

Hollow Core ◽

Reinforcing Bars ◽

Simply Supported ◽

Resistance Moment ◽

Hollow Core Slab ◽

Maximum Shear Strength

The structural designs of floors formed by hollow core slabs usually consider these as simply-supported slabs. In recent years there have been project changes and hollow core slabs with continuity are widely used. The objective of this study is to suggest a way to calculate the reinforcement bars to be used in tests with continuity provided by a structural topping. Thus, this paper presents a method based on the maximum positive resistance moment and maximum shear strength of a hollow core slab. The method is applied to a test in hollow core slab specimens which have the following dimensions: 2 m width, 6 m long, and 21 cm high. The results indicated that the method was satisfactory to the performed test, and can therefore be applied to the other test configurations or even designs.

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Calculation of prestressed structure strengthon the basis of nonlinear deformation model (on the example of multi-hollow core slab without using formwork technology)

Вестник гражданских инженеров ◽

10.23968/1999-5571-2019-16-6-93-110 ◽

2019 ◽

Vol 16 (6) ◽

pp. 93-110

Author(s):

E. K. Opbul ◽

◽

D. A. Dmitriev ◽

Keyword(s):

Nonlinear Deformation ◽

Deformation Model ◽

Hollow Core ◽

Hollow Core Slab ◽

Nonlinear Deformation Model

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Optimization of Geometrical Parameters of Hollow-core Slabs by Formwork-free Shaping for Construction in Seismic Areas

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.f9192.038620 ◽

2020 ◽

Vol 8 (6) ◽

pp. 4973-4977

Keyword(s):

Cross Section ◽

High Strength ◽

Geometrical Parameters ◽

Hollow Core ◽

Constructive Solution ◽

Industrial Buildings ◽

Operational Load ◽

Wide Range ◽

Hollow Core Slab ◽

The Cross

The building norms and standards of Uzbekistan on the reinforced concrete structures do not regulate the design of hollow-core slabs of formwork-free shaping, reinforced with prestressed wire reinforcement. The manufacturing technology of such slabs allows creating a wide range of products that increase the possibility of their use in various structural systems in residential, civil and industrial buildings, but in non-seismic areas only. The aim of this work is to develop a constructive solution for the cross section of a prestressed hollow-core floor slab of bench formwork-free shaping, reinforced with high-strength wire reinforcement, in order to create a wide range of products intended for construction in seismic areas. To achieve the goal, the problem of determining the optimal combination of height and configuration parameters of the cross section of such a slab is solved, meeting the normalized operational requirements and limitations of earthquake-resistant building standards. The main variable parameters are the height and the void degree of the section, characterized by the size and shape of voids. In calculating the cross-section of a hollow-core slab when substantiating the theoretical basis for the calculation, the cross section is reduced to the equivalent I-section. As a result of research, a constructive solution was developed for the slab cross section of the maximum parameter values (the span, operational load) set by the customer. The parameters of the slab cross-section are: the height 190 mm, the hollowness 38%, the height of the upper thickened flange (compared with the height of the lower flange) of the given section is 0.27h, the height of the lower flange is 0.17h, the reduced (total) thickness of all ribs “b” is 0.32 of the width of the upper flange. The voids in the section along the height of the slab are arranged asymmetrically. A patent for a utility model has been received for the proposed constructive solution of the slab cross section.

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Longitudinal Joint Performance of a Concrete Hollow Core Slab Bridge

Transportation Research Record Journal of the Transportation Research Board ◽

10.1177/0361198118781653 ◽

2018 ◽

Vol 2672 (41) ◽

pp. 196-206 ◽

Cited By ~ 2

Author(s):

Diego Maria Barbieri ◽

Yuechi Chen ◽

Enrico Mazzarolo ◽

Bruno Briseghella ◽

Angelo Marcello Tarantino

Keyword(s):

Finite Element ◽

Design Method ◽

Concrete Strength ◽

Element Model ◽

Active Role ◽

Hollow Core ◽

Hinge Joint ◽

Longitudinal Joint ◽

Hollow Core Slab ◽

Longitudinal Cracks

Hollow core slab bridges are constructed by placing prefabricated or prestressed box beams adjacent to each other, grouting the small longitudinal space (hinge-joint) between the slabs and casting a reinforced concrete deck. The longitudinal cracking appearing at hinge-joint locations leads to a premature deterioration of the deck. This paper presents a theoretical and experimental study of a hollow core slab bridge composed of three beams and a cast-in-place deck. A real-size specimen was built according to Chinese code specifications. The behavior of the longitudinal joints was investigated by applying the standard vehicle load. The tests do not highlight any longitudinal cracks. A finite element model was created from the experimental data. A finite element parametric analysis revealed some practical design indications regarding the following inputs: deck thickness, concrete strength, and hinge-joint steel bars. Furthermore, these analyses testify that C-shape and X-shape stirrups do not play an active role in preventing the joint longitudinal cracks. This research confirms the reliability of the design method, at least for static loads, while further studies are needed to investigate the effect of both periodical loadings and different temperatures on upper and lower surfaces of the beams.

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