Evaluation of the stabilizing thin-shell roof system state by means of dynamic characteristics

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Abstract

The paper presents the results of the stabilizing thin-shell roof system technical survey of the St. Petersburg Sports and Concert Complex. To assess the technical condition of the stabilizing system, the free-oscillation method was used and dynamic tests of half-truss cables were carried out. Based on the results, an assessment of the dynamic characteristics was carried out: the first and second natural-vibration frequencies were identified. As a result, the conclusion was made about the uniformity of the cable tension, and problem areas were identified through the comparison of the obtained characteristics.

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About the authors

P. А. Bakusov

OOO «ISP Georekonstruktsiya»; Saint-Petersburg State University of Architecture and Civil Engineering

Author for correspondence.
Email: bakusovpavel@gmail.com

Lead Engineer, Teacher-Researcher

Russian Federation, 4, Izmaylovsky prosp., Saint Petersburg, 190005; 4, 2nd Krasnoarmeyskaya Street, Saint Petersburg 190005

References

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Supplementary files

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2. Fig. 1. Saint Petersburg Sports and Concert Complex, 1980–1982

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3. Fig. 2. Thin-shell roof installation, 1978

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4. Fig. 3. Layout of thin-shell roof and «petal» with thicknesses by zones

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5. Fig. 4. Structural elements of the thin-shell roof: a – units for fastening the thin-shell roof to the external supporting reinforced concrete ring; b – units of thin-shell roof attachment to the central steel load-bearing ring; c – connection of thin-shell roof «petals» through T-beam

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6. Fig. 5. Stabilizing cable plan and cross section along axis

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7. Fig. 6. Structural elements of semi-trusses: a – units for fastening cables to the column; b – units for attachment of cables to the intermediate stabilizing steel ring; c – general view of stabilizing system

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8. Fig. 7. Example of vibrometer installation on the semi-truss cable

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9. Fig. 8. Normalized spectral densities: a – unclamped cables; b – clamped cables

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10. Fig. 9. Histogram of the distribution of natural frequencies along the axes: blue columns - the first natural frequency, red - the second natural frequency

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11. Fig. 10. Results of geodetic survey: a – deviation of columns from vertical, mm; b – outer support ring levelling, mm; c – levelling of the central steel load-bearing ring, mm

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12. Fig. 11. Displacement of the unit along the cable (damage to the paint layer)

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13. Fig. 12. Example of embedded pipes through which elements of the stabilizing coating system were to pass

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14. Fig. 13. Examples of clamping of stabilizing system elements

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