ABSTRACT
Compared with a corrugated steel culvert, an arch bridge, and other structures that rely on the soil-structure interaction to bear the load, the mechanical performance of a corrugated steel box structure is completely different. It mainly depends on the flexural strength of the box corrugated steel structure to resist the external load. To explore the mechanical properties of a corrugated steel box bridge, in this paper, the mechanical performance of a double-span corrugated steel box bridge with a single span of 13m under static and dynamic vehicle load is tested by outdoor real vehicle test. The following conclusions can be drawn: (1) The two adjacent spans of the double-span corrugated steel bridge interact with each other. When a vehicle acts on one span, the span will generate vertical and transverse deformation, and the lateral deformation will cause the soil to squeeze the other span, creating deformation and the internal force in that span; (2) The vault strain does not always increase with the increase of vehicle speed, but there is a critical speed at which the vault strain will reach the maximum. In this test, the vehicle speed is 80km / h, which is related to the vehicle action frequency. The closer the frequency is to the natural vibration frequency of the structure, the greater the dynamic response will be; (3) The dynamic increasing strain coefficient is less than 1; (4) The damping effect of embedded bridge structures such as corrugated steel box bridges is more obvious than that of beam bridges, which helps to reduce the structural resonance amplitude caused by vehicle load driving; (5) The double-span corrugated steel box bridge shows a larger axial force under the vehicle load, and the one span structure loaded later has a larger axial force, which is mainly in the tensile state. The pavement structure is beneficial to the stress of the box corrugated steel bridge beam and plays a role similar to the decompression plate to diffuse the live load and reduce the structural bending moment.
