scholarly journals Shear Performance for Prestressed Concrete Hollow Core Slabs

2020 ◽  
Vol 10 (5) ◽  
pp. 1636 ◽  
Author(s):  
Yong-Jun Lee ◽  
Hyeong-Gook Kim ◽  
Min-Jun Kim ◽  
Dong-Hwan Kim ◽  
Kil-Hee Kim
Keyword(s):  
Compressive Strength ◽  
Shear Strength ◽  
Prestressed Concrete ◽  
Hollow Core ◽  
Loading Test ◽  
Cross Sectional ◽  
Simply Supported ◽  
Shear Performance ◽  
Compressive Strength Of Concrete ◽  
The Web

This study evaluated the shear performance of prestressed concrete hollow core slabs (HCS), which are convenient to use as floor structures of flexible spaces. A total of 18 specimens, with cross-sectional height and presence of topping concrete as variables, were fabricated by extrusion. A four-point loading test was conducted using simply supported beams. The results showed that shear performance satisfied the requirements of ACI 318-19 regardless of cross-sectional height or presence of topping concrete. Through comparison with past studies, the web-shear strength of HCS was found to be influenced by compressive stress due to prestress at the centroid, compressive strength of concrete, and shear span-to-depth ratio.

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

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.

scholarly journals Cyclic Shear Performance of Reinforced Concrete Columns Strengthened by External Steel Rods

2021 ◽  
Vol 13 (23) ◽  
pp. 13224
Author(s):  
Hyeong-Gook Kim ◽  
Yong-Jun Lee ◽  
Kil-Hee Kim
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Analytical Approach ◽  
Concrete Columns ◽  
Loading Test ◽  
Rc Structures ◽  
Cyclic Shear ◽  
Flexural Failure ◽  
Shear Performance ◽  
Strengthening Method

This study presents a strengthening method for reinforced concrete (RC) columns. The proposed method, which consists of a pair of steel rods, two reverse-threaded couplers, and four corner blocks, is feasible and straightforward. A quasi-static cyclic loading test was performed on the columns externally strengthened by the steel rods. It was found that the corner blocks and the external steel rods with a low prestress level effectively confined the concrete on the compression side of plastic hinges, which eventually induced flexural failure with a ductility higher than three in the strengthened columns. In addition, an analytical approach to predict the shear strength and ultimate flexural strength of the externally strengthened columns was applied. The comparison of analytical and experimental results showed that the analytical approach provided highly accurate predictions on the maximum strength and the failure mode of the externally strengthened columns. It is expected that the application of the proposed method will improve the seismic performance of damaged or deteriorated RC structures, thereby increasing their lifespan expectancy and sustainability.

scholarly journals Evaluation of Residual Compressive Strength and Behavior of Corrosion-Damaged Carbon Steel Tubular Members

Materials ◽  
2018 ◽  
Vol 11 (7) ◽  
pp. 1254
Author(s):  
Jin-Hee Ahn ◽  
Seok-Hyeon Jeon ◽  
Young-Soo Jeong ◽  
Kwang-Il Cho ◽  
Jungwon Huh
Keyword(s):  
Compressive Strength ◽  
Failure Modes ◽  
Compressive Loading ◽  
Steel Structures ◽  
Corrosion Damage ◽  
Local Corrosion ◽  
Structural Behavior ◽  
Loading Test ◽  
Element Analysis ◽  
Cross Sectional

Local corrosion damage of steel structures can occur due to damage to the paint-coated surface of structures. Such damage can affect the structural behavior and performance of steel structures. Compressive loading tests were, thus, carried out in this study to examine the effect of local corrosion damage on the structural behavior and strength of tubular members. Artificial cross-sectional damage on the surface of the tubular members was introduced to reflect the actual corroded damage under exposure to a corrosion environment. The compressive failure modes and compressive strengths of the tubular members were compared according to the localized cross-sectional damage. The compressive loading test results showed that the compressive strengths were affected by the damaged width within a certain range. In addition, finite element analysis (FEA) was conducted with various parameters to determine the effects of the damage on the failure mode and compressive strength of the stub column. From the FEA results, the compressive strength was decreased proportionally with the equivalent cross-sectional area ratio and damaged volume ratio.

Load configuration, geometry and web reinforcement effects on failure modes of sandwich deep beams

2016 ◽  
Vol 20 (7) ◽  
pp. 811-830
Author(s):  
Leon Raj J ◽  
Appa Rao G
Keyword(s):  
Shear Strength ◽  
Failure Modes ◽  
Load Transfer ◽  
Deep Beams ◽  
Cross Sectional ◽  
Concentrated Load ◽  
Modes Of Failure ◽  
Web Reinforcement ◽  
Uniformly Distributed Loads ◽  
The Web

In this article, an experimental investigation is carried out to understand the behaviour of sandwich deep beams. The shear strength, load transfer mechanism, integral action and failure modes are reported. Primary variables of this study include distribution of web reinforcement, beam geometry and type of loading. Twelve full-scale beams were tested with simply supported end conditions classifying them into two groups. Each series consists of six beams with rectangular and I-shaped cross-sectional geometry. Two types of loading, i.e. concentrated and uniformly distributed loads, were adopted to understand the influence of distribution of horizontal reinforcement along the depth of beam in the web. Using both types of cross-sections, two beams were tested under uniformly distributed loads, and all the remaining beams were subjected to concentrated load with two different shear span-to-depth ratios (a/d). Observations of the study with respect to strength and serviceability include initial cracking load, ultimate load, crack width, transverse deflection and out-of-plane deformations. The test results indicated that confined or unconfined I-beams in the web failed due to punching shear under concentrated or distributed loads. The modes of failure of rectangular beams with web confinement were diagonal splitting and shear-compression, whereas the unconfined beams failed in flexure. Shear strength expression for conventional deep beams is refined for sandwich beams, and the predicted shear strength agrees well with the experimental results.

scholarly journals STUDY ON THE EFFECT OF POLYETHYLENE TEREPHTHALATE COMPRESSIVE STRENGTH OF CONCRETE

Neutron ◽  
2020 ◽  
Vol 19 (2) ◽  
pp. 73-81
Author(s):  
Umi Latifah ◽  
Syafwandi
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Mineral Water ◽  
Coarse Aggregate ◽  
Lightweight Concrete ◽  
Waste Plastics ◽  
Loading Test ◽  
The World ◽  
Compressive Strength Of Concrete ◽  
Mechanical Nature

Plastic waste is the largest contributor in the world and belongs to the class of materials that can not be broken down by organisms (non-bio-degradable) and durable (persistent) which does not rot. It can be seen directly from this waste that is lightweight and not easily deformed. Terephthalate polyethylene plastic types are widely used as mineral water bottles can be recycled as coarse aggregate for lightweight concrete manufacture. In this study, carried out the loading test compressive strength. To determine the properties of lightweight concrete, tested the modulus of elasticity, compressive strength, and strong Pull. The physical and mechanical nature of light concrete in the use of waste plastics PET instead of coarse aggregate must be following existing regulations. The compressive strength of concrete with the highest in the age of 28 daycare that is equal to 23.973 MPa. The highest tensile strength value contained in the concrete to the age of 28-day care is equal to 2,782Mpa.

scholarly journals Shear Tests of Deep Hollow Core Slabs Strengthened by Core-Filling

2020 ◽  
Vol 10 (5) ◽  
pp. 1709
Author(s):  
Hyo-Eun Joo ◽  
Sun-Jin Han ◽  
Min-Kook Park ◽  
Kang Su Kim
Keyword(s):  
Shear Strength ◽  
Resistance Mechanism ◽  
Hollow Core ◽  
Shear Reinforcement ◽  
Shear Cracks ◽  
Shear Strengthening ◽  
Strain Behavior ◽  
Long Span ◽  
Current Design ◽  
The Web

Prestressed hollow core slabs (PHCSs) have commonly been applied to long-span structures, due to their excellent flexural capacity and deflection control performance. However, in quite a few cases, the web-shear strength at member ends subjected to high shear forces is insufficient, because the web of the PHCS is very thin, making it difficult to place shear reinforcement, and the prestress is not fully effective in transfer length regions. Accordingly, a variety of shear strengthening methods have been proposed to improve the web-shear strength of PHCS ends. In this study, experimental research was conducted to investigate the shear resistance mechanism of PHCS strengthened by core-filling method, which has been most widely used in the construction field. The number of filled cores and the shear reinforcement ratio were set as the main test variables, and the patterns and angles of shear cracks that occurred in the PHCS units and filled cores, respectively, and the strain behavior of the shear reinforcement, were measured and analyzed in detail. This study also analyzed the test results based on the current design codes, and proposed a modified shear strength equation that can be applied to the core-filled PHCS.

scholarly journals UJI EKSPERIMENTAL GESER INTERFACE SUBSTRATE DAN TOPPING DENGAN VARIASI KEKUATAN TEKAN PADA LAPIS TOPPING

2018 ◽  
Vol 14 (2) ◽  
pp. 180-195
Author(s):  
Indah Nurrahman
Keyword(s):  
Compressive Strength ◽  
Shear Strength ◽  
Shear Test ◽  
Test Results ◽  
Normal Concrete ◽  
Shear Strength Test ◽  
Roughened Surface ◽  
Compressive Strength Of Concrete ◽  
Quantitative Descriptive ◽  
Cylindrical Samples

ABSTRACTThe study aims to: determine the shear strength of concrete connection with applying compressive strength variations plans on topping layer. Extra toppings on a substrate made 28 days (the concrete substrate) and shear test connection 56 days of age (age 28 days connection). The type of concrete used is normal concrete where the connection does not roughened surface and without addictive substances. The study was conducted using laboratory experiments. This study uses the compressive strength of concrete plans substrate 20 MPa (NCS20) and compressive strength of concrete plans topping is 20 MPa (NCT20), 25 MPa (NCT25) and 30 MPa (NCT30). The test object cuboid with dimensions of 20x20x20cm. In the concrete susbtrate has a thickness of 12.5 cm and for concrete topping with a thickness of 7.5 cm. Each specimen consists of 3 specimens with a total of 9 specimens. Data analysis using quantitative descriptive. The results of the study obtained compressive strength in the sample substrate with a mean NCCS20 notation is 18.51 MPa. Concrete topping cylindrical samples with notation NCCT20, NCCT25, and NCCT30 obtained a mean compressive strength is 22.21 MPa, 24.39 MPa and 30.93 MPa. Shear strength test results NCST20-20 connection with the notation, NCST20-25, and NCST20-30 ie 0.44 MPa, 0.45 MPa and 0.3 MPa. Value shear test connection is influenced by several factors, such as the connection surface texture, hydration process, aggregate functions, compressive strength, porosity of concrete, slump value and watertight.Keywords: shear strength of the connection, substrate, toppingABSTRAKKajian dilakukan untuk mengetahui kuat geser sambungan beton dengan menerapkan variasi kekuatan tekan rencana pada lapis topping. Penambahan topping pada substrate dilakukan umur 28 hari (umur beton substrate) dan uji geser sambungan umur 56 hari (umur sambungan 28 hari). Jenis beton yang digunakan adalah beton normal dimana permukaan sambungannya tidak dikasarkan dan tanpa bahan zat adiktif. Kajian dilakukan dengan metode eksperimen di laboratorium. Kajian ini menggunakan kuat tekan rencana beton substrate 20 MPa (NCS20) dan kuat tekan rencana beton topping yaitu 20 MPa (NCT20), 25 MPa (NCT25), dan 30 MPa (NCT30). Benda uji berbentuk kubus dengan dimensi 20x20x20cm. Pada bagian beton susbtrate memiliki ketebalan 12,5 cm dan untuk beton topping dengan ketebalan 7,5 cm. Setiap spesimen berjumlah 3 buah benda uji dengan jumlah keseluruhan 9 buah benda uji. Analisis data menggunakan deskritif kuantitatif. Hasil dari kajian didapat kuat tekan pada sampel substrate dengan notasi NCCS20 rerata yaitu 18,51 MPa. Beton silinder sampel topping dengan notasi NCCT20, NCCT25, dan NCCT30 didapat kuat tekan rerata yaitu 22,21 MPa, 24,39 MPa dan 30,93 MPa. Hasil uji kuat geser sambungan dengan notasi NCST20-20, NCST20-25, dan NCST20-30 yaitu 0,44 MPa, 0,45 MPa dan 0,3 MPa. Nilai uji geser sambungan dipengaruhi oleh beberapa faktor, seperti tekstur permukaan sambungan, proses hidrasi, fungsi agregat, kuat tekan, porositas beton, nilai slump dan kedap air  Kata kunci: kuat geser sambungan, substrate, topping

Experimental investigation of the web-shear strength of deep hollow-core units

PCI Journal ◽  
2011 ◽  
Vol 56 (4) ◽  
pp. 83-104 ◽  
Author(s):  
Keith D. Palmer ◽  
Arturo E. Schultz
Keyword(s):  
Experimental Investigation ◽  
Shear Strength ◽  
Hollow Core ◽  
The Web

Strength of Interior Reinforced Concrete Beam-Column Assembles

2011 ◽  
Vol 250-253 ◽  
pp. 3506-3509
Author(s):  
Jung Yoon Lee ◽  
Jong Wook Park ◽  
Sang A Cha
Keyword(s):  
Compressive Strength ◽  
Shear Strength ◽  
Reinforced Concrete ◽  
Axial Force ◽  
Reasonable Agreement ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Strength Deterioration ◽  
Force Ratio ◽  
Compressive Strength Of Concrete

This paper provides a method to predict the strength of interior reinforced concrete beam-column joints that fail in shear before the plastic hinges occur at both ends of the adjacent beams. The proposed method takes into account the axial force ratio, the compressive strength of concrete, and the shear strength deterioration in the beam-column joints. In order to verify the shear strength of the proposed method, the behaviors of 38 interior beam-column joints were compared. Comparisons between the observed and calculated shear strengths of the tested beam-column assembles, showed reasonable agreement.

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