Reasonable arch axis of open web deck type arch bridge and determination method thereof

Abstract

The invention relates to reasonable arch axis of an open web deck type arch bridge and a determination method thereof. The determination method comprises the following steps: dividing a dead load of the open web deck type arch bridge into dead weight of a bridge deck system, dead weight of a column and dead weight of a main arch ring; serializing the discrete dead weight of the column to a continuous load in a linear relationship with coordinates of the main arch ring by equivalent membrane tension assumption; serializing a discrete concentrated force transferred to the main arch ring by the bridge deck system to a horizontal uniformly distributed load; and linearly combining three pressure lines of the dead weight of the bridge deck system, the dead weight of the column and the dead weight of the main arch ring according to the proportions of the thrusts in total thrust by analyzing the pressure lines of the dead weight of the bridge deck system, the dead weight of the column and thedead weight of the main arch ring and the thrust of the main arch to obtain the reasonable arch axis of the open web deck type arch bridge. The reasonable arch axis is clear in mechanical concept andsimple in method, and the reasonable arch axis of the open web deck type arch bridge can be determined quickly, so that the workload of bridge designers is reduced greatly. The arch bridge is reasonable in stress and economical in material utilization amount.

Description

technical field [0001] The invention relates to a reasonable arch axis of an arch bridge and a determination method thereof, and is particularly suitable for determining the reasonable arch axis of an empty-bellied top-supporting arch bridge composed of various types of dead loads. Background technique [0002] From the birth of ancient arch bridges to the construction of various modern arch bridges, from the concept of a reasonable arch axis to the widespread use of actual pressure lines based on various line fittings, basically experienced arc lines, parabolas, suspensions, etc. Five development stages of chain line, suspension cable line, high-order parabola fitting actual pressure line and arch axis optimization. [0003] arc line. The ancient arch bridges in various countries in the world use circular arcs as the arch axis. The calculation of the arc line is simple, the curvature of each point of the whole span is the same, and the construction is convenient. However...

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is that it is difficult for the known type of arch axis to coincide with the pressure line of the main arch ring of the hollow vertical arch bridge with complex and discontinuous dead load, that is, it is difficult to determine the reasonable arch axis

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