scholarly journals An accurate method for the calculation of ultimate load in lattice boom

2019 ◽  
Vol 11 (11) ◽  
pp. 168781401988677 ◽  
Author(s):  
Liming Zhou ◽  
Jinghao Tang ◽  
Weijie Wang ◽  
Erfei Zhao ◽  
Shuhui Ren ◽  
...  
Keyword(s):  
High Strength Steel ◽  
Ultimate Load ◽  
Design Method ◽  
High Strength ◽  
Accurate Method ◽  
Effective Length ◽  
Stability Factor ◽  
Steel Tubes ◽  
Effective Length Factor ◽  
The Stability

To calculate the ultimate load of the lattice boom accurately, the effective length factor and imperfection factor are introduced to the current stability factor formula. First, we propose a stability factor formula by conducting a series of tests of high-strength steel tubes under axial compression and analyzing the experimental data. Second, the effective length factor of the chord which is caused by braces is calculated on the basis of different effective length factors and stability curves. Then, the correctness of the proposed effective length factor and the stability factor formula are proved by destructive tests under three loading modes. Using the modified stability factor formula, the accuracy of ultimate load of lattice boom is enhanced. These findings will be of great value for improving the design level of lattice boom and providing a theory and test basis for the completion of the buckling design method of the high-strength steel tubes.

Experimental Study on Bearing Capacity of Q690 High-Strength Steel Tubes under Axial Load

2014 ◽  
Vol 638-640 ◽  
pp. 101-104
Author(s):  
Yi Liang Peng ◽  
Guo Tian Li ◽  
Xuan Min Han ◽  
Lei Chen
Keyword(s):  
Experimental Study ◽  
Bearing Capacity ◽  
High Strength Steel ◽  
Axial Load ◽  
High Strength ◽  
Steel Grade ◽  
Stability Factor ◽  
Steel Tubes ◽  
Steel Members ◽  
The Stability

With the rapid development of power transmission and transformation projects in China, steel supporting structure has already became the most popular structural form for these structures. However, the limit of steel grade used for current substation supporting structures is normally Q420, compared with that of Q690 used in other countries. When the high-strength steel is used, the geometric parameters of section for members become smaller, and the stability of members is the most important factors to influence the bearing capacity of structures. The stability factor for axial loaded steel members in current 《Code for design of steel structures》(GB50017-2003) was derived based on the experimental results for steel members with lower steel grade, the results are inevitably different from those for high-strength steel members. To make the calculations of Q690 high-strength steel tubes more accurate and reasonable, this paper conducts experimental study on the bearing capacity of Q690 high-strength steel tubes under axial load to provide scientific basis for practical design of these structures.

Crash response of advanced high-strength steel tubes: Experiment and model

2009 ◽  
Vol 36 (8) ◽  
pp. 1044-1057 ◽  
Author(s):  
Nader Abedrabbo ◽  
Robert Mayer ◽  
Alan Thompson ◽  
Christopher Salisbury ◽  
Michael Worswick ◽  
...  
Keyword(s):  
High Strength Steel ◽  
High Strength ◽  
Advanced High Strength Steel ◽  
Steel Tubes ◽  
Crash Response

Influence of Lubricants on Advanced High Strength Steel Tubes in Bending Process

2009 ◽  
Author(s):  
Ramakrishna Koganti ◽  
Sergio Angotti ◽  
Isadora van Riemsdijk ◽  
Robert C. Nelson ◽  
Jill Smith
Keyword(s):  
High Strength Steel ◽  
High Strength ◽  
Steel Tube ◽  
Application Site ◽  
Structural Components ◽  
Advanced High Strength Steel ◽  
Steel Tubes ◽  
Automotive Body ◽  
Bending Process ◽  
Lubricant Performance

To reach safety, emissions, and cost objectives, manufacturers of automotive body structural components shape thin gauge, high strength steel tube using a series of manufacturing steps that often include bending, preforming and hydroforming. Challenging grades and bend severity require a sensitive optimization of the tubular bending process. Lubricants play a significant role in establishing a successful bending process. In this study, the performance of two lubricants, Hydrodraw 551 and HFO 20, were investigated for bending Dual Phase 780 (DP780) and High Strength Low Alloy 350 (HSLA350) thin-walled steel tubes. Formability success was evaluated in terms of wrinkling, thinning strain and final geometry. Lubricant performance was found to be sensitive to grade and application site. HFO 20 was found to be a poor choice for bending DP780 tube.

Strength Optimization of Infant Pop-Up Seat Frame Using Discrete Material and Thickness Optimization

2021 ◽  
Vol 11 (3) ◽  
pp. 1-20
Author(s):  
YeongJo Ju ◽  
Euysik Jeon
Keyword(s):  
Optimal Design ◽  
High Strength Steel ◽  
Design Method ◽  
High Strength ◽  
Optimization Method ◽  
Design Criterion ◽  
Thickness Optimization ◽  
Element Analysis ◽  
Strength Design ◽  
Seat Frame

In this paper, the authors proposed an optimal design method for the strength design of infant pop-up seat frame combined with rear seats for infants, children, and adults, not removable booster seats or car seats. Frame strength design was performed using discrete material and thickness optimization (DMTO) method considering high strength steel (HSS) and advanced high strength steel (AHSS). Structural design using the Section 4 link mechanism was performed, and the weakness of the seat frame due to static load was confirmed through finite element analysis. An optimal design criterion was established by carrying out a case study to derive the limiting conditions according to static and dynamic loads. In consideration of these criteria, the optimal design according to d-optimal and discrete Latin-hypercube (DLH) was performed among the design of experiments (DOE). And the strength of the pop-up seat frame for infants according to each DOE was checked, and the strength optimization method was suggested by comparing the lightweight ratio.

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