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

Abstract

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 Comparison of the Known Hypotheses of the Lateral Buckling for Semi-Slender Pinned Columns

“…Virgens et al (2019) presented the experimental study of eccentrically loaded reinforced concrete columns with an added 35 mm self-compacting concrete jacket attached to the column's most compressed faces using wedge bolts. Zhou et al (2019) introduced the effective length factor and imperfection factor to the current stability factor formula to calculate the ultimate load of the lattice boom accurately. Zucco et al (2020) tested a 750×640×240 mm variable-stiffness unitized integratedstiffener out-of-autoclave thermoplastic composite wingbox for a combined shear-bending-torsion induced buckling load.…”

“…Johnson-Ostenfeld's simplification was described in the paper Murawski (2008b). Ylinen (1956) used the approximation of the function Et = d/d= Et() and obtained the equation:…”

“…The stability phenomenon of semi slender columns in elastic-plastic states was researched too, by (Tetmajer, 1886;Jasiński, 1894;Engesser, 1889;1895;Ostenfeld, 1898;Kármán, 1908;1910;Shanley, 1947;Stowell, 1948;Bijlaard, 1949;Bleich, 1952;Broszko, 1953;Ylinen, 1956;Radhakrishnan, 1956;Gerard and Becker, 1957;Gerard, 1957;1962;Seide et al, 1960;Vol'mir, 1965;Březina, 1966).…”

Stability, Stress and Strain Analysis of Very Slender Pinned Thin-Walled Box Columns according to FEM, Euler and TSTh

“…Tests were conducted for different values of slenderness. Zhou et al (2019) introduced the effective length factor and imperfection factor to the current stability factor formula to calculate the ultimate load of the lattice boom accurately. Abedini et al (2020) focused on investigating blast load parameters to design reinforced concretes columns to withstand blast detonation.…”

Technical Buckling, Stress and Strain Simplified Analysis of Semi-Slender Thin-Walled Cylindrical Pinned Column

“…Nine columns with a 2000 mm height were tested under compression and one-way bending until failure. Zhou et al (2019) introduced the effective length factor and imperfection factor to the current stability factor formula to calculate the ultimate load of the lattice boom accurately. Zucco et al (2019) tested a 750×640×240 mm variablestiffness unitized integrated-stiffener out-of-autoclave thermoplastic composite wing-box for a combined shearbending-torsion induced buckling load.…”