Diaphragm damage of precast concrete T-shape girder bridge: Analysis and strengthening

作者：Niu Yanwei^*; Liu Bangjun; Zhao Yu; Rong Shuai; Huang Pingming

来源：The Open Civil Engineering Journal, 2014, 8(1): 434-438.

DOI：10.2174/1874149501408010396

• Damage
• Failure process
• Field test
• Girder bridges
• Live loads
• Operation and maintenance
• Pre-cast
• T shapes

<jats:p>For advantage of economical and practical construction, precast T-shape girder bridge is commmonly used in
China. In recent years, damage of diaphragm became a serious problem in operation and maintenance. In this study, based
on finite element (FE) analysis of an actual bridge, stress distribution and failure process of diaphragm is demonstrated.
The result shows that the stress of middle diaphragms started to beyond the limit firstly, under heavey load of 1.5 times
equivalent Grade highway-I live load. Then, method of Double-K brace to strengthen the transveral connnection of the exist
bridges is proposed and applied on background bridge. Based on the field test, tensile stress of diaphragms concrete reduced
69.4% when Double-K brace were adopted, and the lateral integrity of precast T-beam bridge could be improved
effectively.</jats:p>

• 出版日期2014--
• 单位长安大学