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Natural frequencies and modes of bridges are very important for wind-resistant design, seismic design and damage test. Natural characteristics of existing bridge in design stage cannot consider the initial complex stress conditions. Actually, the bridge bears the complex initial load (Gravity load, Vehicle load, etc.) in the operation stage, which will cause a certain initial deflection, especially for long span bridges. So, the natural characteristics of bridge get changed. According to the design data of Minpu bridge, the three-dimensional finite element model of Minpu bridge is established by using frame element system based on SAP2000. Result shows that the first and second natural frequencies of the Minpu bridge in design stage are 0.12 Hz and 0.33 Hz respectively. Natural characteristics of Minpu bridge in the operation state are tested by using the microtremor measurement, and the first and second natural frequencies and modes of it are obtained. Result shows that the first natural frequency is 0.39 Hz. The second natural frequency is not uniform, which is within 2.34 ∼ 3.70 Hz. The results reflect that the first and second natural frequencies of the Minpu bridge in operation stage increased greatly, which show that the initial loading state will have a great impact on the natural characteristics of long span bridges.

Natural characteristics of long span bridge under initial load: a case study of Minpu bridge