Analysis On The Stability Of Concrete Arch Bridge During Cable-hoisting Construction Process

By consulting a large number of literature, this paper expounds the development status quo of reinforced concrete arch bridge and the construction method of long-span reinforced concrete arch bridge, the cable hoisting construction technology are briefly introduced. Cable hoisting construction technology in the widely used at the same time, the stability of the arch rib in the process of construction has become an important subject is unable to avoid.This paper based on the actual engineering of the Longmen bridge from joining arch box installation phase and single arch rib after two construction stage has carried on the theoretical analysis to the stability of arch rib. Focus on analysis and research of arch rib in the process of hoisting disadvantageous status (arch foot section of arch box installed hanging state, arch foot section of arch box suspension status, times arch section installation suspension state), by setting up multiple arch rib by transverse offset Angle research the safety of the arch rib does not occur lateral instability of the range of deviation Angle.Analizing stability of concrete arch rib closure condition, two kinds of calculation method that calculating in accordance with the specification solution and finiting element modeling software to calculate were adopted. Get the following conclusions:①single arch rib after closure, arch rib under the weight of the longitudinal stability and lateral stability can meet the standard requirements;﹐n both sides of the arch rib setting waves wind cable, can significantly improve the lateral stability of arch rib.Analizing stability of arch box assembly stage, by changing wind waves research rib transverse wind loads by blot tension suffered changes. By calculation shows that the waves and wind cable tension bolt joints suffered1liner relationship between tensile; joints far from the wind waves affect the cable connector bolt force is more obvious.Analizing stability of concrete arch box assembly stage, adopt the finite element analysis method to study the lateral displacement of the arch rib on the stability of arch rib. And get the following conclusions:①in50years in a wind load, contact with the abutment of arch foot section of arch box concrete elastic deformation occurs, the connection joint bolt stress will also be able to meet the requirements of bearing capacity of arch rib and arch rib is not going to happen in hoisting phase instability;②lifting arch foot section arch, the angle of the scope of the lateral displacement that arch rib does not occur lateral instability is0～2°;③hoisting arch foot section of arch box, the Angle of the scope of the lateral displacement that arch rib does not occur lateral instability is0～0.9°;④hoisting arch section of box arch, the lateral offset Angle that arch rib does not occur lateral instability range from0to0.3°.