Strengthening Bridge Structure

Tangli Middle Bridge is located next to Tangli Village, Fenggang Town, Dongguan City, on the S250 Highway in Dongguan City. The upper structure of the bridge is a reinforced concrete simply supported T-beam with a combined span of 3×16m and a bridge width of 31m. The original bridge design live load standard is car-15 class, trailer-80, crowd load 3.0kN/m². Due to the needs of traffic development, the design live load is increased to car-20 class, trailer-100, crowd load 3.0kN/m² .

Checking calculation of bearing capacity of original bridge structure

It can be seen that after the vehicle load level is increased, the bearing capacity of the bridge has changed from rich 6.5% to less than -6.6%. Insufficient bearing capacity will affect driving safety. The bridge needs to be reinforced and repaired to increase the bearing capacity.

T beam reinforcement measures

The T-beam of the full bridge is reinforced with carbon fiber wrap on the bottom of the web.

Checking calculation of bearing capacity after reinforcement

This time, the use of carbon fiber wrap reinforcement method effectively improves the load-bearing capacity of T beams and meets the requirements of bridge loading.

Due to the influence of long-term planning, construction and other factors in the bridge design process, many existing bridges in China can no longer meet the requirements for use and need to be reinforced. The introduction and application of the new material carbon fiber technology in my country to strengthen concrete with carbon fiber has not been long, but its excellent performance has been fully reflected in the bridge structure reinforcement project, and this technology will be applied in more and more reinforcement projects.