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应用在影响线上直接加载的方法确定无铵拱计算截面的活载内力,是编制拱桥电算程序的一个重要组成部分。 本文介绍将多元函数的极值问题,利用车辆荷载纵向按一定间距排列的关系,转化为求一元函数的极值问题、以优选法(0.618法)确定公路车辆荷载在无铵拱影响线上加载时的最不利位置的方法及程序总框图。所述方法已在湖南省交通规划勘察设计院编制双曲拱桥定型设计中应用。
It is an important part of the computer program for arch bridge calculation to determine the live load internal force of the calculation section of ammonium-free arch in the method of influencing the direct loading on the wire. In this paper, the extreme value problem of multivariate function is introduced. Using the relationship that the vehicle loads are arranged at a certain distance in the longitudinal direction, it is converted into an extremum problem of one-variable function, and the optimal method (0.618 method) is used to determine the load of the road vehicle during the loading of the ammonium-free arch impact line. The most unfavorable position of the method and the overall block diagram of the program. The method has been applied in the stereotyped design of a double-curved arch bridge prepared by Hunan Provincial Traffic Planning Survey and Design Institute.