日趋饱和的交通量和桥梁荷载等级的不断提高,使得前期设计桥梁早已超出原设计标准。如何通过对既有桥梁进行检测评估、在充分利用旧桥资源的基础上,进行加固、加宽,来提高桥梁的承载能力和通行能力,充分发挥旧桥的作用,己成为桥梁研究者的急迫任务。但是,到目前为止,国内对此类问题从理论上和实践上都缺少成熟的经验。本文以台州某高架桥为实例,从结构受力、施工方便、使用功能和后期维护、造价等几个方面综合分析比较后,对拼宽方案进行优化比选,以期为类似工程提供一定的参考价值。 Increasingly saturated traffic and bridge load levels continue to improve, making the pre-design bridge has already exceeded the original design standards. How to enhance the carrying capacity and capacity of the bridge by reinforcing and broadening the old bridge resources on the basis of making full use of the resources of the old bridge and how to give full play to the role of the old bridge has become an urgent issue for bridge researchers task. However, up till now, there is a lack of mature experience in theory and practice in China for such problems. Taking a viaduct in Taizhou as an example, this paper analyzes and compares several aspects such as force of the structure, convenience of construction, function of use, post-maintenance, cost and so on, and then optimizes and compares the plan of spell width so as to provide certain reference value for similar projects .