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.
Highlights
Crawler cranes possess numerous advantages, such as the great lifting capacity, little ground pressure, small turning radius, excellent climbing ability, non-outrigger design, and ability to drive with load and exceptional stability
The modified formula is more practical in the calculation of ultimate load, which is helpful in improving the design level of the lattice boom and providing a theory and test basis to complete the buckling design method of the high-strength steel tubes
We proposed a practical stability factor formula
Summary
Crawler cranes possess numerous advantages, such as the great lifting capacity, little ground pressure, small turning radius, excellent climbing ability, non-outrigger design, and ability to drive with load and exceptional stability. The carrying capacity of lattice boom was studied in terms of chords’ effective length factor caused by the braces and the stability curve of highstrength steel tubes. The effective length factor was calculated by solving transcendental equation, and the ultimate loads of every lattice boom were determined with different effective length factors and stability curves, respectively. The modified formula is more practical in the calculation of ultimate load, which is helpful in improving the design level of the lattice boom and providing a theory and test basis to complete the buckling design method of the high-strength steel tubes. The failure loads of two intermediate sections were 395.0 and 360.0 kN, respectively, as shown in Figure 10(a) and (b), and maximum deformation occurred on chord b and c whose loads were larger. The failure loads were 378.0 and 369.0 kN, respectively, as shown in Figure 11(a) and (b), and maximum deformation occurred on chord a and b, whose loads were larger
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