1 问题的提出 钢筋混凝土和预应力混凝土简支梁板桥,构造简单、施工方便,是一般中小型桥梁的常用形式之一。但是,在抵抗正弯矩方面空心板桥的受力性能没有T梁好。因此,跨径受到一定的限制,一般认为普通钢筋混凝土空心板桥的经济跨径为6～13m,预应力混凝土空心板桥的经济跨径为8～16m,也就是说,按照传统的做法,即使是采用预 1 PROBLEMS PROBLEMS Reinforced concrete and prestressed concrete simply supported slab-slab bridges are simple in construction and convenient in construction, and are one of the commonly used forms of common medium and small bridges. However, the mechanical properties of the hollow slab bridge are not as good in terms of positive moment as T-beams. Therefore, the span is subject to certain restrictions, generally considered the economic span of ordinary reinforced concrete hollow slab bridge 6 ~ 13m, prestressed concrete hollow slab bridge economic span of 8 ~ 16m, that is, according to the traditional approach, Even using pre-