Abstract: Cap-beams on the middle pier of continuous beam bridges in municipal cross roads are often omitted for the reason of beauty. But a plane analysis is often used in general designs. An actual two-span continuous beam bridge is calculated based on both plane analysis and spatial analysis and the results are contrasted in this paper. The reasons of cracks of the beams are discussed. A dangerous design result may be obtained for the continuous beam bridges which has no cap-beams on the middle pier if

Key words: continuous beam bridge, cap-beams, crack, plane analysis, spatial analysis

摘要： 现有城市立交桥中，常将连续梁桥中间桥墩的帽梁舍去，但设计中却通常作为平面问题进行主梁的受力分 析。笔者以某实际的两跨连续板桥为例，通过平面分析和空间分析及其对比，分析了该桥梁产生严重裂缝的原因， 指出对该类桥梁仅用平面分析会导致偏于危险的设计结果。

关键词: 连续梁桥, 帽梁, 裂缝, 平面分析, 空间分析