scholarly journals Load-bearing capacity of crane beams with fatigue cracks in the compressed belt zone

2021 ◽  
Vol 18 (3) ◽  
pp. 164-169
Author(s):  
A. E. Kubasevich ◽  
Keyword(s):  
Crack Length ◽  
Bearing Capacity ◽  
Local Stability ◽  
Fatigue Cracks ◽  
Critical Parameters ◽  
Normal Stresses ◽  
Load Bearing Capacity ◽  
Numerical Studies ◽  
Wall Flexibility ◽  
Crack Position

The method of determining the critical parameters of stability of the crane beam walls with fatigue cracks in the compressed belt zone is briefly described. The dependences of the bifurcation critical and limit stresses in the wall on the crack length, the crack position in the section, and on the wall flexibility are shown. The results of numerical studies of the effect of cracks on the increase in normal stresses in the compressed belt are presented. A method for assessing the local stability of the beam wall with a crack is proposed.

Experimental Research on Load-Bearing Capacity of Frame Columns with Construction Joint under Low-Cyclic Reversed Loading

2013 ◽  
Vol 351-352 ◽  
pp. 363-366
Author(s):  
Xi Kang Yan ◽  
Cheng Dong ◽  
Pei Chen ◽  
Kang Ma
Keyword(s):  
Bearing Capacity ◽  
Experimental Research ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Construction Joint ◽  
Axial Compression Ratio ◽  
The Third ◽  
Simple Processing ◽  
Reversed Loading ◽  
Crack Position

In this paper,in order to study the load-bearing capacity of frame columns with construction joint under low-cyclic reversed loading, nine specimens were made, divided into three groups.Every group had three specimens, the first were made without construction joint, the second had fine processing construction joint, the third had simple processing construction joint. The three groups were loaded in axial compression ratio of 0.23,0.34,0.46 respectively.The results show that the influence of different processing with construction joint to crack position ultimate bearing capacity,skeleton curves.

scholarly journals Stability of crane beam walls with fatigue cracksin the compressed belt zone

2020 ◽  
Vol 17 (4) ◽  
pp. 47-53
Author(s):  
A. E. Kubasevich ◽  
Keyword(s):  
Crack Length ◽  
Bearing Capacity ◽  
Critical Stress ◽  
Fatigue Cracks ◽  
Limit State ◽  
Bending Moment ◽  
Limit States ◽  
Stress Strain ◽  
Beam Bending ◽  
Stress Parameters

The paper describes a method for assessing the bearing capacity of the crane beam walls with fatigue cracks. There has been developed and implemented an algorithm for evaluating the stress-strain and limit state of the beam with a crack in the wall under a compressed belt. There has been established the dependence of the stress-strain and limit states of the beam wall on the value of the initial relative beam bending and the crack length in the section under the action of the bending moment and transverse force. The author presents the results of numerical studies of the effect of cracks on the bearing capacity of the beam wall. The influence of the amplitude of the initial beam wall deflection on the critical stress parameters is revealed. The dependence of the values of critical stress parameters on the relative crack length is considered.

IMPROVING CONSTRUCTIVE SOLUTION OF BEAM WITH CORRUGATED WALL

2016 ◽  
Vol 6 (2) ◽  
pp. 4-9 ◽  
Author(s):  
Aleksey O. LUKIN ◽  
Vadim Yu. ALPATOV ◽  
Dmitriy D. CHERNYSHEV
Keyword(s):  
Bearing Capacity ◽  
Carrying Capacity ◽  
Local Stability ◽  
Local Resistance ◽  
Preliminary Assessment ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
The Stability ◽  
Corrugated Wall ◽  
Corrugated Beam

The analysis of improving ways to test for load-bearing structures - metal beams with corrugated wall was conducted. Weak places, limiting their load-bearing capacity were determined. It was found that the criterion for determining the carrying capacity of thin-walled corrugated beam is its local resistance. The author's solution to increase the local stability of the corrugated wall beams was suggested. Author's solution is to give the corrugated wall of further extruded profile of different geometry. The influence of the shape and size of punching the wall on the carrying capacity of corrugated beams was determined. The studies confirming the effectiveness of the proposed constructive solutions increase the stability of the corrugated wall are conducted. Preliminary assessment of the degree of increase of the bearing capacity of the beam by punching its wall is obtained.

Estimation of Load-Bearing Capacity and Stiffness of Timber Beams with Through-Thickness Cracks

2013 ◽  
Vol 778 ◽  
pp. 361-368
Author(s):  
Anatoly Yakovlevich Naychuk
Keyword(s):  
Crack Length ◽  
Bearing Capacity ◽  
Cross Section ◽  
Span Length ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Crack Location ◽  
Crack Tips ◽  
Beam Height ◽  
Timber Beams

The results of experimental and theoretical study of the load-bearing capacity and stiffness of wooden beams with through-thickness cracks depending on their length and location throughout the height of cross-section are given. The analysis of the regularity of change of stress-strain state, stress intensity factors (SIF) and at crack tips, deflections and timber beams load-bearing capacity depending on beam span length versus cross-section height, crack length versus span length, crack location throughout beam height was made. It has been established that load-bearing capacity and stiffness of timber beams with through-thickness cracks depends not only on the crack length, but its location throughout cross-section height as well. Procedure of assessing load-bearing capacity and stiffness of timber beams with through-thickness cracks based on fracture mechanics methods is given.

scholarly journals Thin-walled profiles and their joint assembly units built with screws: numerical studies of load bearing capacity

2018 ◽  
Vol 196 ◽  
pp. 01008 ◽  
Author(s):  
Vadim Alpatov ◽  
Alexey Soloviev
Keyword(s):  
Bearing Capacity ◽  
Three Dimensional ◽  
Load Bearing Capacity ◽  
Thread Cutting ◽  
Load Bearing ◽  
Thin Walled Structures ◽  
Numerical Studies ◽  
Thin Walled ◽  
With Screws ◽  
Joint Assembly

There is a tendency to reduce weight of load-bearing metal structures being developed and successfully realized in modern building construction. This idea serves as a basis for a whole scientific direction, named Development and application of light steel thin-walled structures (LSTS). Among them, LTST built with pop-rivets and thread-cutting screws are most widespread due to their simplicity and relative cheapness This paper presents numerical studies of LSTS joint assembly units built with screws and their load bearing capacity. The peculiarity of these units consists in misalignment of joint elements. The calculation was performed in the SolidWorks Simulation System. The modeled node is a three-dimensional assembly consisting of solid components. The results of the study are as follows: 1) thin-walled profiles have a significant sensitivity to eccentricity; 2) it is unacceptable to disregard eccentricities for thin-walled profiles and their joint connections; 3) eccentricities should be compensated by measures to improve reliability in joint connections design.

scholarly journals Analysis of the load-bearing capacity of timber members exposed to fire

2018 ◽  
Vol 247 ◽  
pp. 00009
Author(s):  
Kamil Kmiecik ◽  
Tomasz Domański
Keyword(s):  
Bearing Capacity ◽  
Cross Sections ◽  
Environmental Influence ◽  
High Energy ◽  
Building Structures ◽  
Safety Requirement ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Finite Element Software ◽  
Numerical Studies

Members of building structures are often made of wood. There are many advantages of using timber, such as quick erection time, good environmental influence and high energy efficiency. But the fire safety requirement is one of the most important issues concerning the design of timber structures. Safe use in structures depends on a proper knowledge and modelling of the chemical and physical reactions related to the increase of temperature inside the timber members. This paper presents a summary of results from numerical studies on the heat transfer through timber members exposed to fire from different sides. The finite element software SAFIR was used to make two-dimensional thermal models of the timber elements. Then the FE models were used to analyze the heat flow within the members under standard ISO-fire exposure interacting from different sides. On the basis of the 300 °C isotherms, residual cross-sections were determined. Then, the load-bearing capacity of the elements exposed to fire from different sides was determined. The obtained results showed that the location of construction members against the fire has a significant impact of the temperature distribution in the cross-section and, as a result, on the load-bearing capacity of the timber members.

Increased load bearing capacity of mechanically joined FRP/metal joints using a pin structured auxiliary joining element

2020 ◽  
Vol 62 (1) ◽  
pp. 55-60
Author(s):  
Per Heyser ◽  
Vadim Sartisson ◽  
Gerson Meschut ◽  
Marcel Droß ◽  
Klaus Dröder
Keyword(s):  
Bearing Capacity ◽  
Load Bearing Capacity ◽  
Load Bearing

Load-Bearing Capacity of Direct Inlay-Retained Fibre-reinforced Composite Fixed Partial Dentures with Different Cross-Sectional Pontic Design

2017 ◽  
Vol 68 (1) ◽  
pp. 94-100
Author(s):  
Oana Tanculescu ◽  
Adrian Doloca ◽  
Raluca Maria Vieriu ◽  
Florentina Mocanu ◽  
Gabriela Ifteni ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Fracture Pattern ◽  
Load Bearing Capacity ◽  
Cross Sectional ◽  
Load Bearing ◽  
Reinforced Composite ◽  
Polyethylene Fibre

The load-bearing capacity and fracture pattern of direct inlay-retained FRC FDPs with two different cross-sectional designs of the ponticwere tested. The aim of the study was to evaluate a new fibre disposition. Two types of composites, Filtek Bulk Fill Posterior Restorative and Filtek Z250 (3M/ESPE, St. Paul, MN, USA), and one braided polyethylene fibre, Construct (Kerr, USA) were used. The results of the study suggested that the new tested disposition of the fibres prevented in some extend the delamination of the composite on buccal and facial sides of the pontic and increased the load-bearing capacity of the bridges.

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