Analysis of Construction Process Control of Single-Tower Double-Stay Semi-Suspended Prestressed Concrete Cable-Stayed Bridge
The main purpose of cable-stayed bridge construction monitoring is to achieve the geometric alignment and stress state designed after the completion of the bridge by adjusting the elevation of the beam and the tension of the cable-stayed cable at each stage of construction,which ensures that the bridge alignment and internal forces meet the design and code requirements,while also ensuring structural safety during bridge construction.The Xiyi Bridge is 578 meters in total length,with a main beam structure of 120 m+120 m prestressed concrete.The bridge tower is in a single tower double cable-stayed form.Stress and cable force of the main bridge section are monitored during con-struction,and the monitoring results are analyzed to provide real-time data for construction.Any anomalies are promptly corrected and adjusted to ensure that the bridge meets design requirements upon completion.The results show that the maximum stress on the bottom plate of the main beam is-14.73 MPa,and the maximum stress on the top plate of the main beam is-9.76 MPa.The compressive strength of the main beam cross-section meets the requirements of the specifications.Both the bottom plate and top plate of the main beam exhibit local tensile stress,with a maximum tensile stress of 0.40 MPa,meeting the requirements for section crack resistance;The middle con-struction error of the cable is within 5%,and the final cable force error is within 2%,meeting the construction tech-nical specifications and design requirements.The monitoring analysis method for Xiyi Bridge provides reference for similar bridge monitoring.
NETL
NSTL
万方数据
维普
