Reliability of Single-Layer Steel Space Domes under the Effects of the Changes in the Height-to-Span Ratio

Document Type : Research Article


1 Department of Civil Engineering, University of Sistan and Baluchestan, Zahedan, Iran.

2 Department of Civil Engineering, Zabol Branch, Islamic Azad University, Zabol, Iran.

3 School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran.


In space domes, geometrical changes are the main factors that determine the forces in the structural members. This paper has addressed the effects of the height-to-span ratio variations on the reliability of space domes. Applied loads, nodes coordinates, member’s cross-section, modulus of elasticity, and yield stress are the random variables, and FORM (first-order reliability method), SORM (second-order reliability method), MCS (Monte Carlo sampling) and IS (importance sampling) were the methods used to evaluate the reliability of such structures. Results showed that FORM yielded better solutions; reliability increased with an increase in the height-to-span ratio, and a change in the performance function changed the reliability index and sensitivity coefficient. Hence, for domes with height-to-span ratios less than 0.3, the displacement performance function is the effective function and for ratios greater than 0.3, the stress performance function should be considered as the critical function.


Main Subjects

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