Тhe method of calculation accuracy large-span metal rod systems

Бондарев, А. Б.; Yugov, Anatoliy

doi:10.5862/mce.61.6

Cited by 4 publications

(3 citation statements)

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“…We introduce a new parameter n = 2k -1. The displacement of the middle node of the lower belt is determined by the Maxwell-Mohr's formula 3 ( 2 It is indicated: i l -the length of the rods, () P i S -the forces in the rods from the given load, (1) i S -the forces from the unit force applied to the knot of the lower belt in the middle of the span, E is the modulus of elasticity of the rods, and F is the area of their cross sections.…”

Section: Fig 1 Truss Load On the Lower Belt N=5mentioning

confidence: 99%

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Inductive analysis of the deflection of a beam truss allowing kinematic variation

2018

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A scheme of a statically determinate planar truss is proposed and an analytical calculation of its deflection and displacement of the mobile support are obtained. The forces in the rods from the external load, uniformly distributed over the nodes of the lower or upper belt, are determined by the method of cutting out nodes using the computer mathematic system Maple. In the generalization of a number of solutions of trusses with a different number of panels to the general case, the general terms of the sequence of coefficients in the formulas are found from solutions of linear homogeneous recurrence equations. To compose and solve these equations, Maple operators were used. In the process of calculation it was revealed that for even numbers of panels in half the span, the determinant of the system of equations degenerates. This corresponds to the kinematic degeneracy of the structure. The corresponding scheme of possible speeds of the truss is given. The displacement was determined by the Maxwell-Mohr’s formula. The graphs of the obtained dependences have appreciable jumps, which in principle can be used in the selection of optimal design sizes.

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Section: Fig 1 Truss Load On the Lower Belt N=5mentioning

confidence: 99%

“…Numerical methods for calculating rod systems [1][2][3][4][5] have an alternative. With the advent of mathematical systems (Maple, Mathematica, Derive, Reduce) producing symbolic operations, it became possible to derive finite formulas for various characteristics of the stress-strain state of the trusses.…”

Section: Introductionmentioning

confidence: 99%

Inductive analysis of the deflection of a beam truss allowing kinematic variation

2018

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“…Фрикционные соединения на высокопрочных болтах -наиболее ответственный тип соединения в металлических конструкциях мостов. Особенность данного вида соединений заключается в том, что передача усилий осуществляется только силами трения, возникающими по контактным поверхностям соединяемых деталей вследствие натяжения болтов [8][9][10][11][12]. Для получения надежных сдвигоустойчивых болтовых соединений все работы на монтаже конструкций должны вестись так, чтобы болты имели проектное осевое натяжение P, а состояние соприкасающихся поверхностей (поверхностей трения) имело предусмотренный проектом коэффициент трения µ. Если поверхности деталей будут обработаны небрежно, с отступлениями от условий, обеспечивающих требуемое качество, величина коэффициента µ может снизиться, прочность болтовых соединений будет отличаться от проектной и все сооружение получится малонадежным [13][14][15][16].…”

Section: Introductionunclassified

Stress-strain state of friction joints with laser treatment of contact surfaces

et al. 2019

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Introduction. Researched is conducted to determine the possibility of using an alternative method - laser cleaning. Laser systems have proven themselves in many areas and are a high-tech and effective solution for many construction problems. Despite this nowadays sandblasting is the most common method of processing contact surfaces of high-strength bolted joints - an outdated technology, with high equipment wear and even dangerous to people’s health. Materials and methods. Sandblast and laser-treated specimens were tested for shear. Before testing, the roughness of the contact surfaces and the tension force of high-strength bolts were tested. During the test, the readings of the meter and dial-indicator were taken. The experiments were carried out on a hydraulic press IPS-500, the samples were provided in a processed form. Results. According to the data obtained, strain graphs were plotted and the shear forces of the samples were calculated. Calculated efforts were compared with standard values. The results show the compliance of samples with the requirements of SP 35.13330.2016 “Bridges and pipes” in terms of strength characteristics. Samples with laser surface cleaning have a safety margin value similar to sandblasted samples. Conclusions. Comparison of the strength characteristics proves the possibility of using laser cleaning of the contact surfaces of friction joints. After the transition from outdated technologies, the process of surface preparation can be made economical and environmentally friendly. The obtained values and data can be entered into a number of regulatory documents, including SP 35.13330.2016 “Bridges and pipes” for future research and the widespread application of the method.

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On the precision of assembly of complicated structures

Petelina

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Тhe method of calculation accuracy large-span metal rod systems

Cited by 4 publications

References 0 publications

Inductive analysis of the deflection of a beam truss allowing kinematic variation

Inductive analysis of the deflection of a beam truss allowing kinematic variation

Stress-strain state of friction joints with laser treatment of contact surfaces

On the precision of assembly of complicated structures

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