American Society of Civil Engineers

Parameter Models for Estimating In-Situ Tensile Force in Tie-Rods

by Stefano Sorace, (Asst. Prof., Inst. of Energetics, Facu. of Engrg., Perugia Univ., 06125 Perugia, Italy)

Journal of Engineering Mechanics, Vol. 122, No. 9, September 1996, pp. 818-825, (doi:

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Document type: Journal Paper
Abstract: Two analytical models are presented for the identification of the actual static scheme and tensile force of metallic tie-rods included in masonry arches and vaults. The reference structural system consists of a moment-resistant tie-beam with elastic rotational springs at the extremities. Symmetrical restraint conditions are initially hypothesized, thus obtaining a two-parameter model in which the unknowns are the springs’ rigidity along with the axial force. The preceding assumption is then removed by defining a more general, three-parameter model in which two different spring rigidities are considered. The mutual experimental data are the middle-section vertical displacement under a concentrated load and the fundamental vibration frequency; the second vibration frequency is adjunctively assumed for the three-parameter model. Closed-form equations are formulated in both cases. Laboratory tests show a notable agreement between analytical estimates and experimental measures. A statistical balance of the application of the proposed models to over 200 rods belonging to several Italian monumental as well as common ancient buildings is presented along with more-detailed information about a significant case study.

ASCE Subject Headings:
In situ tests
Metals (material)