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Methods of Improving the Natural Vibration Characteristics of the Through Tied-Arch Bridge and Test Verification

机译：Methods of Improving the Natural Vibration Characteristics of the Through Tied-Arch Bridge and Test Verification

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摘要

A through tied-arch bridge with multi-point elastic constraints (MTAB) is proposed based on the truss structure concept to improve the natural vibration characteristics of the conventional through tied-arch bridge (CTAB). Rigid inclined rods are added between the main beam and arch ribs to form an integral truss structure with arch ribs as upper chords, rigid inclined rods as web members, and the main beam as a bottom chord to increase the rigidity of the structure. Through timely system transformation, arch ribs bear all dead loads and the integral truss structure bears all the live loads so that the advantages of arch ribs and web members are maximized. The pulsation test and finite element analysis (FEA) were carried out to verify the superiority of the natural vibration characteristics of the MTAB based on a 50 m span test bridge. Taking a 350 m span arch bridge as an example, the natural vibration characteristics and other mechanical characteristics of the MTAB were studied and compared with that of the CTAB. The results show the MTAB has better mechanical properties and economy, especially natural vibration characteristics and stiffness.

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