【摘要】 铁路提速后,大量的铁路平交道口已经改为下穿立交或上跨立交的结构形式.在下穿立交的结构形式中,单孔、双孔或三孔连续的框架桥的结构形式已经比较普遍,设计施工等技术已经很成熟了.但四孔连续的框架桥结构形式还是不多见,在设计和施工中,还存在一些需要研究的问题.本文根据厚板有限元原理,提出了四孔连续框构桥的设计方法,并用面向对象的程序设计方法实现了四孔框构桥的自动设计、分析计算及绘图等过程,将极大提高框构桥设计的工作效率.更多还原

【Abstract】 As the speed of train increases,a great deal of railroad level crossings have already been changed into the structure form of overpass or underpass.In the structure form of underpass,the single bore,double bores or three bores continuous frame bridge is widely used,and the technique of design and construction has been mature already.However,the structure of four bores continuous frame bridge is infrequent.There are still some problems in the process of design and construction.According to the theory of thick slab finite element,the method of designing four bores continuous frame bridge is proposed.In addition,the process of design,analysis,account and plot have been automatically carried out by using the object-oriented programming method,and the efficiency of designing the frame bridge will be increased prodigiously.更多还原