Load Paths Visualization in Plane Elasticity Using Load Path Function Method

2016 ◽  
Author(s):  
Kaveh Gharibi ◽  
Ali Tamijani
Keyword(s):  
Function Method ◽  
Plane Elasticity ◽  
Load Path ◽  
Load Paths

scholarly journals Load paths visualization in plane elasticity using load function method

2018 ◽  
Vol 135 ◽  
pp. 99-109 ◽  
Author(s):  
Ali Y. Tamijani ◽  
Kaveh Gharibi ◽  
Marcelo H. Kobayashi ◽  
Raymond M. Kolonay
Keyword(s):  
Function Method ◽  
Plane Elasticity ◽  
Load Paths ◽  
Load Function

Load Path Transmission in Joining Elements

2021 ◽  
Vol 883 ◽  
pp. 73-80
Author(s):  
Christian Steinfelder ◽  
Sven Martin ◽  
Alexander Brosius ◽  
Thomas Tröster
Keyword(s):  
Path Analysis ◽  
Fe Model ◽  
3D Analysis ◽  
Tensile Shear ◽  
Load Path ◽  
Element Analysis ◽  
Transmission Path ◽  
Future Design ◽  
Load Transmission ◽  
Load Paths

The mechanical properties of joined structures are determined considerably by the chosen joining technology. With the aim of providing a method that enables a faster and more profound decision-making in the spatial distribution of joining points during product development, a new method for the load path analysis of joining points is presented. For an exemplary car body, the load type in the joining elements, i.e. pure tensile, shear and combined tensile-shear loads, is determined using finite element analysis (FEA). Based on the evaluated loads, the resulting load paths in selected joining points are analyzed using a 2D FE-model of a clinching point. State of the art methods for load path analysis are dependent on the selected coordinate system or the existing stress state. Thus, a general statement about the load transmission path is not possible at this time. Here, a novel method for the analysis of load paths is used, which is independent of the alignment of the analyzed geometry. The basic assumption of the new load path analysis method was confirmed by using a simple specimen with a square hole in different orientations. The results presented here show a possibility to display the load transmission path invariantly. In further steps, the method will be extended for 3D analysis and the investigation of more complex assemblies. The primary goal of this methodical approach is an even load distribution over the joining elements and the component. This will provide a basis for future design approaches aimed at reducing the number of joining elements in joined structures.

scholarly journals Mode Stresses for the Interaction between an Inclined Crack and a Curved Crack in Plane Elasticity

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
N. M. A. Nik Long ◽  
M. R. Aridi ◽  
Z. K. Eshkuvatov
Keyword(s):  
Integral Equations ◽  
Function Method ◽  
Quadrature Rule ◽  
Plane Elasticity ◽  
Mode Iii ◽  
Inclined Crack ◽  
Complex Variable Function ◽  
Curved Crack ◽  
Variable Function ◽  
Complex Variable Function Method

The interaction between the inclined and curved cracks is studied. Using the complex variable function method, the formulation in hypersingular integral equations is obtained. The curved length coordinate method and suitable quadrature rule are used to solve the integral equations numerically for the unknown function, which are later used to evaluate the stress intensity factor. There are four cases of the mode stresses; Mode I, Mode II, Mode III, and Mix Mode are presented as the numerical examples.

An Educational Elasticity Problem With Friction, Part 3: General Load Paths

1983 ◽  
Vol 50 (1) ◽  
pp. 77-84 ◽  
Author(s):  
J. Dundurs ◽  
M. Comninou
Keyword(s):  
Elasticity Problem ◽  
Exact Nature ◽  
Load Path ◽  
Initial State ◽  
Concentrated Force ◽  
Load Paths

This concluding paper treats general load paths when the two components of the concentrated force are allowed to change independently with time. It is shown that there are two kinds of dependence on the load path. For certain directions of the forward tangent, the dependence is strict in that the deformations depend on the full details of the path. For other directions, however, the dependence is loose, and the deformations do not depend on the exact nature of the path as long as the forward tangent falls within given bounds. The problem also shows that, given an initial state, the load space can be subdivided into different regions each corresponding to a certain mode of deformations.

scholarly journals The Route That Forces Take

2008 ◽  
Vol 130 (09) ◽  
pp. 39-42
Author(s):  
James G. Skakoon
Keyword(s):  
Human Factor ◽  
Mechanical Design ◽  
Design Tool ◽  
Engineering Analysis ◽  
Force Transmission ◽  
Load Path ◽  
Analytical Design ◽  
Load Paths ◽  
Potential Problems ◽  
Factor Design

This article discusses that visualizing the load path in a design can uncover areas open to improvement. Planning the force transmission path during mechanical design is hardly dazzling engineering analysis, but explicitly doing so will improve your designs. By visualizing the transmission of forces, one can eliminate unnecessary parts, strengthen the design, and identify potential problems for further analysis or correction. Visualizing the path of transmitted forces for cables is pretty easy; forces follow the tension cables. But it is only slightly more complex with compression and shear involved. Although design is never a strictly linear progression, reviewing and refining the load path should be a formal part of the design process. Troubles with the load path in user-centered device design may become obvious with testing, but thinking about load paths as a human factor design issue can save time and effort. It is not a highly analytical design tool, but visualizing and refining load paths in structures and mechanisms is extraordinarily useful for designers, and it’s simple.

scholarly journals Alternative Load Path Analysis for Assessing the Geometric Agreement of a Cable-Stayed Bridge with Steel Truss Girders

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Xiaobo Zheng ◽  
Gang Zhang ◽  
Yongfei Zhang ◽  
Leping Ren
Keyword(s):  
Computer Software ◽  
Element Model ◽  
Load Path ◽  
Brittle Damage ◽  
Cable Stayed Bridge ◽  
Load Paths ◽  
Vehicle Loading ◽  
Bridge Collapse ◽  
Steel Truss ◽  
Collapse Behavior

The geometric agreement, commonly hailed as load-transferring paths withinbridge structures, is significantly crucial to the bridge structural mechanicalperformance, such as capacity, deformation, and collapse behavior. This paperpresents a methodology dependent on alternative load paths to investigate thecollapse behavior of a double-pylon cable-stayed bridge with steel truss girderssubjected to excess vehicle loading. The cable-stayed bridge with steel trussgirders is simplified using a series-parallel load-bearing system. This researchmanifests that the enforced vehicle loading can be transferred to alternativepaths of cable-stayed bridges in different load-structure scenarios. A 3-Dfinite element model is established utilizing computer software ANSYS to explorethe collapse path of cable-stayed bridge with steel truss girders, taking intoaccount chord failure, loss of cables together with corrosion in steel trussgirders. The results show that chord failures in the mid-portion of the mainspan result in brittle damage in truss girders or even sudden bridge collapse. Further,the loss of long cables leads to ductile damage with significant displacement.The corrosion in steel truss girders has a highly slight influence on the collapsebehavior of cable-stayed bridge. The proposed methodology can be reliably usedto assess and determine the vulnerability of cable-stayed bridge with steeltruss girders during their service lifetime, thus preventing structural collapsesin this type of bridge.

Background information for some of the proposed earthquake design provisions for the 2005 edition of the National Building Code of Canada

2003 ◽  
Vol 30 (2) ◽  
pp. 279-286 ◽  
Author(s):  
Ronald H DeVall
Keyword(s):  
Structural Design ◽  
Building Code ◽  
Background Information ◽  
Load Path ◽  
Special Design ◽  
Load Paths ◽  
Irregular Structures ◽  
Earthquake Design ◽  
Importance Factor ◽  
Design Requirements

There are many changes proposed for the Earthquake Design Provisions of the 2005 edition of the National Building Code of Canada (NBCC). Among them are requirements for complete load paths, separation of stiff nonstructural elements, and the introduction of definitions of irregular structures and special design requirements associated with these irregularities. A new requirement for direction of loading is introduced, along with requirements for elements common to more than one lateral load resisting system. The effects of displacements are emphasized throughout the document, and revised provisions for drift limits are proposed. Revisions to the importance factor that integrate it into the proposed revised format for Part 4, Structural design, of the NBCC are given. Background information is presented.Key words: load path importance factor, irregular structures, direction of loading, special requirements, drift limits.

LOAD PATH REFORMULATION AROUND MULTIPLE RESTRICTIONS FOR AN INDUSTRIAL RETROFIT

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Tim Hogue
Keyword(s):  
Structural Steel ◽  
Regulatory Compliance ◽  
Lessons Learned ◽  
Industrial Plant ◽  
Structural Members ◽  
Load Path ◽  
Moment Frames ◽  
Load Paths ◽  
Construction Schedule ◽  
Existing Structure

Process, operational, and electrical restrictions inherent in the design of a regulatory compliance upgrade for an industrial plant, and overburdened existing structure, required an unusual structural retrofit. There were multiple restrictions on placement of structural members and multiple needs for additional strength in the existing members. To manage the constraints, the load path was reformulated to bypass problem areas and focus upgrade work on just a few locations. The key in selecting upgrade locations was determining where there was reserve capacity in the existing foundation. Two such locations were identified and super-bents were formed there using existing moment frames. Horizontal trusses were built to bridge between the super-bents. A super-bent included a new grade beam, with end bulbs surrounding existing column pedestals, column section augmentation, new heavy anchor bolts and new diagonals to convert two parallel beams into a deep truss. Embedded structural steel was utilized in the grade beam end bulbs to distribute anchorage forces and develop reliable load paths around obstructed columns. Unusual uses of structural steel, work in obscured areas, unconventional structural systems and construction schedule interruptions led to an increase in construction management and inspection scope and complexity. CM lessons learned from the project involved better interaction of disciplines during design and greater input from engineering just prior to and during construction.

A New Method to Investigate the Failure Envelopes of Offshore Foundations

2016 ◽  
Author(s):  
Yinghui Tian ◽  
Tianyuan Zheng ◽  
Tao Zhou ◽  
Mark J. Cassidy
Keyword(s):  
Test Method ◽  
New Method ◽  
Combined Loading ◽  
Resistance Force ◽  
Flow Conditions ◽  
Load Path ◽  
Failure Envelope ◽  
Load Paths ◽  
Failure Envelopes ◽  
Probe Test

This paper presents an alternative numerical method in addition to the traditional ‘probe test’ to investigate the combined loading failure envelopes of foundations in soil. In the ‘probe test’ method, the foundation is displaced with a specified displacement path and eventually the soil resistance force reaches a stabilised point sitting on the failure envelope in the load space. While the displacement paths are arbitrarily or empirically set, the positions of the stabilised loads on the failure envelope can not be predetermined or planned. This paper’s new method, however, can specify the load paths, which directly shoot onto the failure envelope. This allows the investigation of the failure envelope can be better achieved with planned load paths. In addition, this new method is advantageous in checking the plastic flow conditions (i.e. normality of the failure envelope) as the load path directions are predetermined.

scholarly journals Analytical Simplify Models Of The Key Elements In The Alternative Load Path Within The Frame In Accidental Situation

2015 ◽  
Vol 15 (2) ◽  
Author(s):  
Nguyen Nam Hai Luu
Keyword(s):  
Global Behavior ◽  
Structural Elements ◽  
Load Path ◽  
Load Paths ◽  
Internal Forces

Abstract The present document is dedicated to global behavior of a frame further to the loss of a column, taking into account the redistribution of the internal forces. Structural elements, transfer the load to the foundation, are isolated as key elements. Two possible alternative load paths in the investigated event are described. The proposal on the local investigation of the important sub structure instead of full global frame’s assessment reveal the internal forces distribution along the alternative load path is demonstrated.

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