Speed ​​the Route Steel Truss Bridge Cwr Vertical Additional Force

With the advance of the special railway for passengers and the high-speed railway, speeding of existed railway and the development of the city track traffic, the super long continuously welded rail (CWR) has already been the main form of track structures. The interrelated action principle of beam and rail of continuously welded rails on bridge is the pivotal technique of track engineering. Basing on interrelated action principle of beam and rail, it puts forward a new finite element method calculation model of additional longitudinal force CWR on bridge, which regards track-ballast-beam-pier and abutment as an integrated system. Program which calculates CWR on bridge additional longitudinal force of steel truss bridge is organized with the "set-in-right-position" rule. Loading thin step incremental method is used to solve nonlinear equation party. Calculating program language is C++. The results of additional longitudinal force compared with results of differential equation method, the results of Ritz method which bases generalized variational principle and results with finite element method. Comparison validates the results is exact, so the CWR on bridge additional longitudinal force of steel truss bridge calculation model is reasonable.CWR on many spans steel truss bridge additional longitudinal force is calculated in track-ballast-beam-pier and abutment system, and studies influence to additional longitudinal force of different number span, longitudinal rigid of pier and abutment, different bearing decoration. Unequal span simply supported concrete beam and steel truss beam combination bridge whose form same property is studied, and contrasts against the same concrete beam or steel purlin beam bridge. The paper studies influence to additional longitudinal force because of brake truss setting location, setting number, longitudinal beam cut and their combination. The computing method and the distribution regulation of longitudinal force of special design simply supported concrete beam bridge is studied. The paper discusses continuous steel truss beam bridge influence to additional longitudinal force whether sets rail expansion adjusters or not, setting location. When rail breaks off, the represent of the interrelated action principle of beam and rail, calculation method of break joint and break force is analyzed. Continuous steel truss beam bridge whose temeprature span is enough long should sets rail expansion adjusters on the kinetic port is advised.