Research On The Key Technology Of Trussed Combination Arch Bridge Strengthened

The trussed combination arch bridge was first created in China in the eighties of the last century. it has many advantages, such as beautiful lightness structure, large spanning ability, saving labor and material, comparison of simple construction and etc. In the past 20 years it has been strongly promote and have achieved very good results. However, after 20 years of development and use, this bridge type gradually revealed numerous shortcomings and disease is becoming more serious.At present, research results in trussed combination arch bridge reinforcement are very few. Therefore, the study Truss Arch Bridge reinforcement key technology is of great practical significance.First, by collecting the existing trussed combination arch bridge research data, to identify the major diseases of trussed combination arch bridge. based on the first design and construction drawing, using Dr. bridge plane finite element analysis software, establishing plane finite element model of Fade bridge to simulate the construction process, and through static analysis under constant load, the live load and load combinations, the author reached the result that the main reasons why diseases and deficiencies appear in trussed combination arch bridge are the type of the bridge system itself birth defects, excessive pursuit of technical indicators for the economy,these caused many cases of partial bridge collapse component strength can't meet the requirements of design, safety reserves low, structure durability poor.Then this paper analysed and summarized the reinforcement situation of trussed combination arch bridge, and researched the reinforcement key technology. the author reached the result that starting from changing the structural system, increasing the last quarter roof,making the solid-web section return to traditional arched bridge; based on the energy-released method reinforcement technology,imprive bearing capacity; strengthen the structure horizontal contact,enhance integrity.Finally, the author took Fade bridge for application example, established reinforced plane and finite element model, and analyzed its static and dynamic performances for a practice example .It could be reached that Fade bridge can meet the Road-â…¡-strength requirements after been reinforced, and it has greater safety reserves. Also, the vibration frequency bands reinforcement than before, the whole bridge has increased stiffness, reinforced significantly, improved dynamic performance.