Simulation Of Thermal Stress Of Lock Floor In Changsha Integrated Hub

Large lock concrete temperature crack problem is more outstanding, wish is usually due to temperature stress of concrete structure beyond the tensile strength.hydraulic structure concrete once appear rifts, that will affect the structure of integrity and durability, even interfere with their normal operation and use of hydraulic concrete structure. so the temperature stress has been engineering problems concern. Specification for concrete temperature stress computation USES is influence line method, i.e. assume foundation piece temperature stress for ChanLianYu linear elastic stress problem, and separately calculated temperature and stable temperature casting the difference of temperature stress and caused by hydration heat temperature drop caused by the temperature stress, then obtained superimposed. This method has been used in many projects and have a good effect. But as the development of modern water, lock design model becomes more and more complicated; Boundary conditions considered in factors such as climate changeful become more, the engineering personnel hope to learn area, atmospheric temperature change process of temperature stress of concrete structure effect, etc.; Design of important parameters, such as the consideration and more subtle concrete creep stress influence of temperature is fairly large, and creep influence is a process of changing with time, in the early days of the larger, produced creep later smaller. These aspects with the standard method is difficult to all considering, and finite element method in this respect has its unique advantage.Temperature stress computation finite element method, many scholars by a large amount of research, academician of Chinese academy of engineering ZhuBoFang of finite element method of temperature stress theoretical till, that make our country temperature stress computation finite element theory to mature. This paper USES Compaq Visual Fortran 6.6 C language compiled the temperature stress of concrete creep finite element program, and calls the program in ansys, realizing the finite element calculation of concrete creep, comprehensive hub for changsha construction of shiplock floor temperature stress obtained as follows simulation analysis of main conclusions:(1) the construction process of changsha hub of concrete soleplate for 39.9°C highest temperature. Optimization scheme floor for maximum stress value of soleplate, edge 1.37 MPa for 1.65 MPa of concrete, less than maximum tensile value 1.78 MPa, meet the design requirements specification.(2) this paper recommend at 350 days (nearly 12 months) jointcolse, at bottom when internal temperature 13.0°C only. But if engineering have other factors considered, also it can choose in 120 days (4 months) when jointcolse.(3) changsha hub for two-lane locks, the two-lane locks are between the structure of 20mm wide set the seam. Caused by temperature bottom of maximizing the deflection of the 1.5 mm, temperature load cause displacement is smaller than structure seam spacing, structure joints is safe; Air temperature pelter for 7°C the critical. According to the situation of shiplock region temperatures, if appear as 7°C temperature pelter, suggested in the concrete surface cover straw, plastic film, etc, timely insulation measures arrangement and inspection insulation situation.