支座作为梁式桥的一个必不可少的组成部分,其功能应当是在维持上部构造力学稳定的前提下,允许梁体在支承处能有有限而又无法避免的移动式转动。对多跨简支连续桥面,很明显,在每一个连续段内,只能有一个固定支座,其余必须是活动支座,最低限度也应是滑动支座。如采用活动支座,则在桥面连续前,该连续段内除含有固定支座的那一跨外,其余各跨都将因二端全是活动支座而成为力学上的不 As an indispensable part of beam bridge, the bearing should function as a limited and unavoidable mobile rotation of the support at the bearing, while maintaining the mechanical stability of the superstructure. For a multi-span, simply supported continuous deck, it is clear that there can be only one fixed support in each continuous section, the rest must be a movable support and, at the very least, a sliding support. In the case of movable supports, before the continuous decks, except for the span with fixed supports in the continuous segments, the rest of the spans will be mechanically inactive due to the fact that both ends are all movable supports