Advances in Constructional Engineering

Because the deformation control requirements of large-scale low-speed wind tunnel structures are much higher than the deflection limit of general concrete components, conventional design measures and construction methods can hardly guarantee such high completion accuracy. To ensure the reliability of project design methods and the feasibility of construction,and take into account the investment costs at the same time.We conduct structural model experiments to guide follow-up design and construction.The experiments takes the stable section of the largest wind tunnel span as the research object,and the test model of original size is made. The post-tensioning prestress method is used to control and adjust the deformation of the large-span high-precision general concrete tunnel body.After the comprehensive inspection on the spot,we find that the measured deformation at each measuring point is very close to the theoretical calculation value of the structure, and is far less than the limit figure, the result satisfies the index requirements of the wind tunnel with high precision. The model is made of steel structure core support system, so its strength, deformation and overall stability meet the test precision requirements. Technical solutions such as mold frame support will continue to be optimized, and efforts will be made to achieve the goal of optimizing the savings of 10% of the funds on the basis of 30.65 million yuan planned for the construction measures of the project.

Post-tensioning; Friction coefficient; Rebar shrinkage; Displacement of column top