1. Design
For any project, the core part is design, and its pros and cons greatly affect the cost, quality, construction difficulty and construction period of the project. Although there are some excellent designs in our country, most of them have certain design problems. The unreasonable design not only brings losses to the economy and increases investment, but also buryes hidden dangers to the quality of bridge engineering and seriously hinders bridge construction. advances in technology. In particular, the design of bridge steel structures basically follows the same model, using existing designs without innovative thinking, and rarely using new materials or new structures, and cannot be designed according to the actual geographical conditions and surrounding environment. In addition, in the design process, the performance parameters of the steel structure are not fully calculated, and the strength coefficient is often arbitrarily increased in order to pursue a stable effect, resulting in unnecessary waste of materials and materials. In addition, in the calculation of parameters, the actual use conditions are not considered enough, which makes the bridge unstable and stress yield during the use process. These are common problems in steel bridge design.
2. Quality
In the selection of materials for bridge steel structures, attention must be paid to quality issues, because for bridges, the main body of force is steel and concrete, so the decisive factor affecting the performance of bridges is the quality of steel structures. The standard design must be strictly followed during design, and the standard design must not be lowered arbitrarily. In addition, the steel structure must be operated in strict accordance with the specifications, and each process must be strictly implemented to ensure the engineering quality of the bridge and avoid accidents.
3. Corrosion phenomenon
The main component of steel is iron, so natural corrosion is inevitable for steel, which is also a factor that poses a hazard to bridge design. If the steel structure corrodes to a certain extent, it will seriously endanger the bridge and its service life. Corrosion will reduce the force-bearing capacity of the structure itself, making the overall force of the bridge unstable under the action of traffic load, and some parts with serious corrosion will appear bending phenomenon, and serious traffic accidents will be caused, with disastrous consequences.
4. Welding process
The welding quality has a strong dependence on the process method, and occupies a more important position among the factors affecting the quality of the process. Its influence mainly comes from two aspects: on the one hand, it is the rationality of the process formulation; on the other hand, it is the seriousness of the execution process. The steel structure is mainly combined by the welding process. If the welding process is strictly not carried out according to the reasonable process, welding defects will occur. Welding defects not only bring many difficulties to production, but also may cause catastrophic accidents. According to statistics, most of the steel structure accidents are caused by welding defects. This kind of welding defect is more likely to appear in the welding details of the steel structure. These welding details will affect the stability of the overall force of the steel structure. If it is not prevented, it will bury hidden dangers.
5. Bad detail structure
Poor structural details will lead to geometric stress concentration, which is easily overlooked in steel structure design, and it is also one of the reasons that are more likely to cause accidents. Due to the poor detail design of the steel structure of the bridge, the geometric stress of the bridge is concentrated and superimposed during the use of the bridge. Under the action of variable loads, these small damages continue to expand, leading to the expansion of fatigue stress, and eventually lead to accidents. The bridge is an integral structure, and some inconspicuous details may damage the stress system of the entire bridge. If stress concentration or stress fatigue occurs in a small structure, it is easy to deform and cause the steel structure to yield.
Post time: Apr-17-2023