【摘要】 本文借助《起静定刚架的影响线函数》的原理，准确地画出结构在活载作用下的影响线，确定最不利的荷载位置，在此基础上提出一种比较合理的城市立交桥的结构——框架结构。更多还原

【Abstract】 The influence lines for overpass structure are precisely calculated by virtue of theprinciple of infIuence-Iine function for statically indeterminate rigid-jointed frames,and the worst load-position is detcrmined by the lines;then a kind of reasonable strucrure foroverpasses is developed in the paper.更多还原