Test And Research On Pre-stressed Effect About Curved Grider

Curved steel girder bridges are space structures. There are many differences between curved girder and straight bridge in force under external load. Linear transform theory lose its meaning in adjusting wires position because of"bend-twist"coupling. As pre-stressed wire, friction loss calculation can't accord to the formula and parameters suggested by the standard. And it is not enough that research about pre-stressed outburst from concrete. Combined with pre-stressed test, this article will study and research about the steel position, friction loss and radial force in inner concrete in pre-stressed effect of curved bridge.First, fundamental theories and computing methods in analysis will be introduced, such as equilibrium differential equation called the Vlasov and the girder method. And introduce how to calculate beam grillage's rigidty.Second, build up finite element model by MIDAS, analyse the reason which make support pressure, radial displacement, deflection, stress of inner or outer longeron. And study the influence of internal force and displacement when change the bend-up point position in positive bending district or negative one. It can be draw a conclusion that the change of quartile in span is more remarkable under the case.Third, anaslyse the force influence to ventral shield of box girder under radial force by building up ANSYS model and combined with site test. And anaslyse the influence when change the collapse steel's corss section area and protection thickness of concrete. As a result, it is available to prevent cracks by raising the collapse seteel's corss section area and protection thickness of concrete.Finally, compare parameters suggested by the standard with the friction parameters which is worked-out by the least squares technique and the assuming coefficient method in friction test. And anaslyse the different values of pareameters with finite element model. And when change one of the pareameters, anaslyse the influence to friction loss. According to the analysis,μor k increase can make results.increaseμmakes result variation increase, but k makes result variation descend.