Starting from the perspective of sustainable development, it is advisable to reserve more than 10 cable channels within the bridge. On the basis of satisfying the cross-sectional requirements for cable arrangement, the selection of general steel structure trusses for cable trays with spans of 30m and 40m can meet the requirements for bearing capacity and stiffness. It is recommended to use a prestressed steel truss structure system for cable trays with a span of more than 40m, which can reduce the height of the truss section. The working condition that controls the load-bearing capacity of the truss is the combination of dead load and live load. Therefore, for simply supported prestressed steel trusses, the use of double line prestressed arrangement method has a better effect. Afterwards, some suggestions for standardized creation were proposed.
With the rapid growth of the national economy, the demand for power supply in various regions has further advanced. However, due to the large-scale development of land, it is often difficult to select the transmission line route, and high-voltage power cables often cross rivers. When crossing wide rivers, cable tray structures are commonly used, with concrete aqueducts and steel structure trays being common. The concrete aqueduct bridge scheme requires the installation of formwork on the river surface, pouring of trench concrete, and protection and shaping. Its defects are that the formwork is difficult to support, the construction period is long, and the construction difficulty is relatively high. If constructed on the waterway, it will affect navigation for a long time, which is greatly affected by the season and local shipping and transportation conditions. Nowadays, the planning and construction technology of steel structures is becoming increasingly advanced. The use of steel structure bridges can directly cross large spans without the need for supporting points in the middle of the river, and the construction speed is fast.
The snow load is considered to be a maximum of 0.65kN/m2 with a 50 year return period in Jiangsu Province (Nanjing City); Earthquake effect: The seismic effect is considered based on two conditions: 7 degrees (0.10g) and 8 degrees (0.2g). The first group of planned earthquake groups is selected, and the site soil category is Class III site soil. 8 degrees (0.3g) only appear in Sucheng and Suyu in Suqian. Based on practical experience, a detailed analysis of the situation will be conducted. At 7 degrees, only the impact of horizontal seismic effects is considered, while at 8 degrees, the vertical seismic effects of steep water should be considered together.
Your message must be between 20-3,000 characters!
