1.College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China;
2.School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Abstract:Long-span CFST arch bridges often suffered from serious vehicle-induced dynamic responses during service, but the reasons and effects of the increased vehicle-induced dynamic response were unclear. Taking a typical long-span CFST arch bridge as research object, typical diseases were investigated. Based on field testing and theoretical analysis, the typical diseases and the effects of the viod of supports were studied. Field investigation and test results show: the void of main girder supports caused differential settlement on both sides of expansion joint, and aggravated the vehicle impact of main girder and suspenders. Impact factor of displacement near expansion joint and midspan reached 1.52 and 1.15, respectively. The variation rate of stress amplitude of suspender force is between -28.0% and 18.5%. The numerical results show: vehicle-induced dynamic response of steel box girder and suspenders change significantly after supports were void. The void of the supports cause obvious along-bridge displacement of the main girder, which reaches the same magnitude as the vertical displacement. The peak value of vehicle-induced acceleration of steel box girder increase significantly after supports were void, and the impact will be more significant when the support and steel box girder still collide with each other under vehicle load. Stress amplitude of suspender force changes remarkably after the support was void, and its effect on short suspender is more remarkable. The void of support is one of the main reasons for the significant change of vehicle-induced impact response of steel box girder, suspender and other components of this type of bridge.
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