Investigation on the Flexural Behaviour of Steel Cold Formed Built Up Sections

For the past few decades, substantial progress has been made in material properties and construction methodology, which demands in need of development of stronger and lighter members in structural steel applications. The demands of increase in strength and reduction in weight of sections leads to development of structures which are slender and also stability plays a major role in design. The main goal of this study is to develop and investigate the performance of build-up steel I beam sections with corrugated webs. This study focuses on analysis of flexural behaviour and failure modes of plain web, rectangular, trapezoidal web and triangular web in beams by experimental investigations using three-point load test and analytical investigations using ANSYS software. From experimental and analytical analysis, triangular corrugated web beam performs better compared to all section. The experimental results obtained are more similar to analytical results obtained by ANSYS software with only slight deviations. The failure modes in both experimental investigation and analytical analysis are similar.

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An experimental approach to evaluate the role of rock failure modes in mechanical characterization of metabasalts

10.21203/rs.3.rs-413898/v1 ◽

2021 ◽

Author(s):

Sreyashi Bhowmick ◽

Bikash Kumar Ram ◽

Tridib Kumar Mondal

Keyword(s):

Failure Mode ◽

Triple Junction ◽

Failure Modes ◽

Mechanical Characterization ◽

Point Load ◽

Rock Failure ◽

Load Test ◽

Single Plane ◽

Testing Conditions

Abstract A detailed understanding on rock failure modes testifies the competence of support designs for engineering work. Studying such failure modes using physical models of rock samples under laboratory conditions can be time efficient, informative and economically viable. In this study, the mechanical behavior of massive metabasalts were characterized with reference to rock failure modes through index tests such as point load and Brazilian testing conditions. Rock failure modes under point load test are categorized as i) single plane failure mode, ii) triple junction failure mode, iii) twisted failure mode and iv) single plane (inclined). It is observed that twisted and triple junction failure modes are observed for the samples with higher point load strength values (> 6 MPa). A total of five types of rock failure modes were observed in metabasalts under Brazilian testing conditions such as i) central multiple, ii) central, iii) non-central, iv) central multiple + layer activation and v) conjugate failure modes. Central multiple failure mode is found to be the most common failure mode in metabasalts due to its massive nature. It is also observed that all failure modes under Brazilian test are transpired in the range of 8 to 12 MPa. Among all other perceived rock failure modes, single plane (inclined) and conjugate failure modes under point load and Brazilian tests respectively are introduced in this study. It is evident that rock failure modes, which lead to control the strength of the rocks, should be considered as an important aspect for mechanical characterization of rock materials.

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Influence of Corrugated Web Geometry on Mechanical Properties of I-beam: Laboratory Tests

Materials ◽

10.3390/ma15010277 ◽

2021 ◽

Vol 15 (1) ◽

pp. 277

Author(s):

Marcin Górecki ◽

Krzysztof Śledziewski

Keyword(s):

Mechanical Properties ◽

Laboratory Tests ◽

Failure Modes ◽

Geometric Parameters ◽

Experimental Investigations ◽

Web Geometry ◽

Four Point Bending ◽

Corrugated Webs ◽

Corrugated Web

This paper presents the results of experimental investigations performed on beams with corrugated webs. The aim of the research was to determine the effect of the geometric parameters of the sinusoidal web on the behavior of I-beams subjected to four-point bending. Special attention was paid to the effects of web thickness and wave geometry on the deflection of beams. The obtained failure modes of particular test samples are presented. Reference has also been made to the determined standard load capacities based on Annex D of the EC3 standard. In order to compare the performance of beams with corrugated webs, the results for beams with flat webs of the same thickness of web sheets are also presented.

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Behaviour of Reinforced Concrete Beams With Circular Transverse Openings Under Static Loads

JOURNAL OF SCIENCE AND APPLIED ENGINEERING ◽

10.31328/jsae.v3i1.1288 ◽

2020 ◽

Vol 3 (1) ◽

Author(s):

Ling Jen Hua ◽

Howe Sheng Tang ◽

Wen Kam Leong ◽

How Teck Sia

Keyword(s):

Reinforced Concrete ◽

Failure Modes ◽

Concrete Beams ◽

Reinforced Concrete Beam ◽

Equation Model ◽

Point Load ◽

Load Test ◽

Reinforced Concrete Beams ◽

Structural Behaviour ◽

Beam Height

Transverse opening in a reinforced concrete beam allows the crossing of mechanical and electrical services through the beam. However, it affects the strength of a beam. Understanding its structural behaviour is crucial to ensure a safe design of the beam. For that, an experimental study was carried out on reinforced concrete beams with circular transverse openings. The four-point load test was conducted to study the effects of the size and the position of the opening on the beam performance under the shear and flexural loads. In addition, three reinforcing methods for the opening were tested. The beams were evaluated in terms of the load-displacement responses, mechanical properties, deflections, and failure modes. The opening with the diameter not exceeding 0.25 times beam height affected about 20% of beam strength (without reinforcements at the opening). The diagonal bar reinforcing method effectively restored the beam strength for the opening size not exceeding 1/3 of beam height. The equation model proposed conservatively predicted the ultimate capacity of the beam with a transverse opening.

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Experimental Investigations on Aluminium Ultrasonic Welding Parameters

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.657.306 ◽

2014 ◽

Vol 657 ◽

pp. 306-310

Author(s):

Lăcrămioara Apetrei ◽

Vasile Rață ◽

Ruxandra Rață ◽

Elena Raluca Bulai

Keyword(s):

Microstructural Analysis ◽

Base Material ◽

Welding Process ◽

Ultrasonic Welding ◽

Experimental Investigations ◽

Welding Parameters ◽

Material Structure ◽

Welding Temperature ◽

Wide Range ◽

Made In

Research evolution timely tendencies, in the nonconventional technologies field, are: manufacture conditions optimization and complex equipments design. The increasing of ultrasonic machining use, in various technologies is due to the expanding need of a wide range materials and high quality manufacture standards in many activity fields. This paper present a experimental study made in order to analyze the welded zone material structure and welding quality. The effects of aluminium ultrasonic welding parameters such as relative energy, machining time, amplitude and working force were compared through traction tests values and microstructural analysis. Microhardness tests were, also, made in five different points, two in the base material and three in the welded zone, on each welded aluminium sample. The aluminum welding experiments were made at the National Research and Development Institute for Welding and Material Testing (ISIM) Timişoara. The ultrasonic welding temperature is lower than the aluminium melting temperature, that's so our experiments reveal that the aluminium ultrasonic welding process doesn't determine the appearance of moulding structure. In the joint we have only crystalline grains deformation, phase transformation and aluminium diffusion.

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Analysis of point load test as a method for preliminary geotechnical classification of rocks

Bulletin of Engineering Geology and the Environment ◽

10.1007/bf02635318 ◽

1973 ◽

Vol 7 (1) ◽

pp. 37-52 ◽

Cited By ~ 15

Author(s):

Guidicini G. ◽

C. M. Nieble ◽

A. T. Cornides

Keyword(s):

Point Load ◽

Load Test ◽

Point Load Test

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THE STATUS OF TWO-NEUTRINO AND NEUTRINOLESS DOUBLE BETA DECAY SEARCHES

International Journal of Modern Physics E ◽

10.1142/s0218301393000200 ◽

1993 ◽

Vol 02 (03) ◽

pp. 507-546 ◽

Cited By ~ 33

Author(s):

M.K. MOE

Keyword(s):

Beta Decay ◽

Neutrinoless Double Beta Decay ◽

Double Beta Decay ◽

Experimental Activity ◽

The Past ◽

The Status ◽

Substantial Progress ◽

Direct Counting ◽

Made In

Substantial progress has been made in double beta decay experiments in the past few years, including the beginning of sensitive new searches for neutrinoless double beta decay, and several additional positive detections of the two-neutrino mode by geochemical, radiochemical, and direct-counting techniques. This review discusses the recent experimental activity.

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Point-load test and UPV for compressive strength prediction of recycled coarse aggregate concrete via generalized GMDH-class neural network

Construction and Building Materials ◽

10.1016/j.conbuildmat.2020.122143 ◽

2021 ◽

Vol 276 ◽

pp. 122143

Author(s):

Hossein Razzaghi ◽

Rahmat Madandoust ◽

Hassan Aghabarati

Keyword(s):

Neural Network ◽

Compressive Strength ◽

Coarse Aggregate ◽

Point Load ◽

Load Test ◽

Strength Prediction ◽

Aggregate Concrete ◽

Recycled Coarse Aggregate ◽

Point Load Test

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Point Load Test of Half-Cylinder Core Using the Numerical Model and Laboratory Tests: Size Suggestion and Correlation with Cylinder Core

Advances in Civil Engineering ◽

10.1155/2018/3870583 ◽

2018 ◽

Vol 2018 ◽

pp. 1-11 ◽

Cited By ~ 2

Author(s):

Fengyu Ren ◽

Huan Liu ◽

Rongxing He ◽

Guanghui Li ◽

Yang Liu

Keyword(s):

Numerical Model ◽

Laboratory Tests ◽

Failure Load ◽

Field Tests ◽

Point Load ◽

Diameter Ratio ◽

Load Test ◽

Index Test ◽

Point Load Test ◽

Calculation Procedures

The point load test (PLT) is intended as an index test for rock strength classification or estimations of other strength parameters because it is economical and simple to conduct in the laboratory and in field tests. In the literature, calculation procedures for cylinder cores, blocks, or irregular lumps can be found, but no study has researched such procedures for half-cylinder cores. This paper presents the numerical model and laboratory tests for half-cylinder and cylinder specimens. The results for half-cylinder and cylinder specimens are then presented, analysed, and discussed. A correlation of failure load between half-cylinder and cylinder specimens is established with a suitable size suggestion and correction factor. It is found that the failure load becomes stable when half-cylinder specimens have a length/diameter ratio higher than 0.9. In addition, the results show that the point load strength index (PLSI) of half-cylinder cores can be calculated using the calculation procedures for diametral testing on cylinder cores, and it is necessary to satisfy the conditions that the length/diameter ratio be higher than 0.9 and the failure load be multiplied by 0.8.

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