Bridge Engineering Blog & Technical Insights

Editor: Qin and Han Engineering Ye Ziyan Compiled

With the development of our country's economy, the increase of traffic flow, the increase of traffic pressure, the bridge is often due to the actual traffic load is greater than the original design standard level, the traffic traffic volume far exceeds the design, resulting in the imbalance of supply and demand, resulting in serious congestion of the bridge, often causing damage to the bridge components, in order to ensure its safety, it is necessary to carry out frequent maintenance to meet its use function and extend its service life.

Outsourcing concrete reinforcement methods

The outsourcing concrete reinforcement method, also known as the section reinforcement method, improves the strength, stiffness and stability of the component and reduces the crack width by increasing the cross-section and reinforcement of the component. It is used for beam bridges, arch bridges, rigid structure bridges, piers, foundations, etc. , this method can be used for reinforcement when conditions permit. Outsourcing concrete will increase the dead weight of the original structure. Therefore, when formulating the size of outsourced concrete, the structure under the outsourcing component should be considered at the same timeCarrying capacityThis is the premise of whether the outsourcing concrete scheme is established.

The wind-induced vibration of the bridge structure is divided into many types, such as the main girder (steel box girder) and the cable towervortex excitation vibrationIn addition, there are also different forms (or coupling) of wind-induced vibration such as cable-stayed cables and booms, such as vortex vibration, wind and rain excitation, wake vibration, etc.

It is necessary to fully understand the seismic conditions of the area where the bridge is located, including the intensity of the earthquake,Seismic wave spectrum、Seismic activityetc. At the same time, it is also necessary to determine the design according to the use function of the bridge, the environment and other factorsDesign seismic intensity levels.

Our country is in the world's two major seismic zones———Pacific Rim seismic zoneand the Eurasian seismic zone, it is a country prone to strong earthquakes, Wenchuan,An earthquake occurred in YushuIt shows that strong earthquakes will cause long-term socio-political and economic problems, and bring emotional trauma that is difficult to comfort.