导言在以两片主梁或两个箱梁构成而以桥面板作为其上弦板的桥梁中,设计者的习惯作法,对此种桥式设置一些中间横撑。虽则在某些类型的桥梁中,普遍感到中间横撑是受到欢迎或确实必要的,而在参考文献[8],[10],[19] Introduction It is a designer’s practice in bridges consisting of two girders or two box girders, with the bridge deck as its upper chord, to provide some kind of intermediate bolster for such bridges. Although in some types of bridges, it is commonly felt that middle bolsters are welcome or indeed necessary, and in references [8], [10], [19]