A method for calculating loss of cable clamp bolt pretightening force of a suspension bridge considering main cable creep

Abstract

The present application relates to a kind of suspension bridge cable clamp bolt pre-tightening force loss calculation method considering main cable creep, comprising the following steps: S1, obtains the relaxation test data of suspension bridge main cable and the cable clamp bolt at the position of interest, the characteristic parameters based on time hardening model are obtained by using multiple exponential function fitting to test data;S2, calculate the creep strain of suspension bridge main cable at each time in the process of pre-tightening force loss;S3, calculate the direct loss of main cable creep to cable clamp bolt pre-tightening force at each time in the process of pre-tightening force loss;S4, calculate the bolt pre-tightening force loss amount at each time under the indirect influence of main cable creep;S5, the result in S3 and S4 is superimposed, obtains the pre-tightening force loss of suspension bridge cable clamp bolt considering main cable creep at any time.The present application can comprehensively reflect the long-term influence of main cable creep on cable clamp bolt pre-tightening force, improve the evaluation accuracy of the safety of suspension bridge structure, optimize maintenance strategy, with wide engineering application prospect.

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