This paper analyzes the effect of longitudinal prestressed beams on main span baseplates of some large-span wide box PC continuous rigid frame bridge on box-girder baseplates in sections close to main midspan, and proposes addition of transverse unbonded prestressed steel beams on baseplates to prevent longitudinal cracks and even breakup on box-girder baseplates in this section, and is recognized by design institute and construction unit. The preventive measures for cracks can provide a reference for design of bridges of the same kind.%分析某大跨宽箱PC连续刚构桥主跨底板纵向预应力钢束对主跨跨中附近区段箱梁底板的作用效应,提出增设底板横向无粘结预应力钢束,以防止该区段箱梁底板出现纵向开裂甚至崩裂,该裂缝预防措施可供同类桥梁设计参考.
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