[提要]  某水库老闸交通桥是连接水库大坝与前方基地的惟一交通要道，原框架构件载重按照汽－13设计，现要求将原框架构件按照汽－15进行加固改造设计。在不影响正常交通的条件下，工程运用系统优化原理，选择了预应力人字形斜支柱加固的方法，并进行了设计及计算。

[关键词]  框架加固  预应力  斜支柱  系统优化

 

A certain traffic bridge by an old reservoir is the unique way connecting dam with frontal base. The frame structure is strengthened  as design loads changing from heavy vehicle  13 to heavy vehicle 1 5.Based on systematic optimization, design and application of prestressed herringbone diagonal stanchion strengthening are explored under normal traffic circumstances.The process of manufacturing and installing the bracing set is intrudced also.

Keywords:  frame strengthening; prestress; diagonal stanchion; systematic optimization