Research On Demolition Technology Of Span Prestressed Poncrete Combined Truss Arch Bridge

1980s, the combined truss arch bridge by the independent research anddevelopment of our country, relative to the other bridge type has the advantage oflight weight, low cost and simple construction, so it has developed rapidly in a veryshort time. But in its use and the promotion, people found that it also produces cracksat the rod node and the fasting period, solid web links and shows large crossedbecause of not enough stiffness at the double vertical bar between the foot and brokenjoints or individual Truss Arch Bridge. In recent years, more and more bridge havebeen into the ranks of the dangerous bridges, most of which have been implementedtraffic restrictions and have had an impact on the local traffic. They face the harshreality of the demolition. The demolition of the old bridge is often used blasting orremoved in accordance with the construction of a bridge in reverse chronologicalorder. If reversing order of construction, to ensure that demolition be successful, youneed to the rational design demolition construction program and demolitionconstruction engineering controls.Old Bridge has been in operation for many years, so they have a significantlylower their overall strength, stiffness, stability and mechanical properties. In this case,many indeterminate factors such as a single bridge member and fatigue’s damage inthe joints, plastic deformation, damage partly makes full-bridge stress analysisbecomes more complex and difficult to achieve accurate calculation of thedeformation and stress state of the bridge. At the same time, we have the lack ofnormative guidance and literature in accordance with the construction of a bridge inreverse chronological order demolition, especially the lack of practical engineeringexperience for large-scale demolition of the bridge, so doing some research andexploration is very necessary.In this paper, choose the combined truss arch bridge (ShiZhu YanXi bridge)’sframe construction demolition which has main span of180meters constructed in2002,as a research object. Combined with its experience in the construction of bridgeconstruction and theoretical analysis, the author developed a more reasonabledemolition construction program. The author made the bridge model, simulated theremoval process, analyzed its static force in demolition in order to ensure the safety ofthe entire process of the demolition and successfully achieved large-span the combined truss arch bridge demolition control. This article can provide a reference forsimilar bridge demolition.