In the construction of a frame bridge under existing railway, the B type girder must be transformed into continuously supported state, and two system transformation schemes were proposed, their feasibility were studied through software Midas/Civil and ANSYS. By these comparisons and analysis, it can be drawn that after the system transformation of five B type girders from simply supported state into nine spans continuously girder, each component of the B type girders can bear the train load, and the forced state of frame bridge can also meet the standard requirements.%在某下穿框构桥施工中，通过体系转换将B型梁转变为连续受力状态，并采用Midas／Civil和ANSYS软件对两种体系转换方案进行对比分析，结果表明：将5片B型梁转换为9跨连续梁后，各构件受力能够满足列车通行要求，框构桥受力也能满足规范要求。
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