求翻译：采用有限元分析程序，研究不同拓宽方案与横向拼接下，对相同荷载作用下旧桥的空间效应进行分析，包括旧桥的荷载横向分布、结构变形、应力状况及承载力的影响。是什么意思？

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Using FEM analysis programs to study under different expanding programmes and horizontal concatenation, the same loading space effect analysis of old bridge under, including old bridge transverse load distribution, structural deformation, stress situations and effects of bearing capacity.