求翻译：桥梁是复杂空间的结构。当采用横向拼接加宽方式后，若荷载作用于新桥时，由于横向联系的作用，旧桥也受到荷载作用，反之亦然。早期普通公路(国道、省道)的建设是在我国公路设计和施工规范还不很完善的情况下进行的，由于设计和施工经验的不足，设计和施工方面存在较多的缺陷。尤其随着交通量的急剧增长，重车、超载车辆的大量增加，这一问题更为突出。严重影响着车辆运营的安全。因而，拓宽改造往往需要对旧桥做使用性能和承载能力的提升，需要对拓宽方案、不同拼接方式下荷载横向分布特点及其对旧桥使用性能和承载力的影响进行研究，以结合拓宽方式直接提升旧桥的性能。是什么意思？

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Bridges are complex spatial structure. When using a horizontal towered patchwork manner, after loading role if the new bridge, the horizontal linkages, the old bridge was also affected by the role role load, and vice versa. Early ordinary (road, Provincial road) is in my highway design and construct

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Bridges are complex spatial structures. When using the horizontal concatenation widened after the way, if the load at the time of the new bridge, due to the effects of horizontal linkages, old bridge had also been loads, and vice versa. Early common Highway (National Highway, State Road) is the cons

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