Abstract
The work is dedicated to research of the thermal stresses state of massive concrete and reinforced concrete structures in construction period. The article examines the results of the analysis of the thermal stress state, which occurs in massive concrete ground slab with thickness of 1 m. The study was conducted with using analytical models, which include the factor of diurnal temperature range in comparison with simplified methods. Authors established that solving the problem of thermal stressed state of the massive foundation slabs in the building period without taking into account the influence temperature changing during the month might not cause to significant deviation of the real diagram of the thermal stresses and elongation deformations in the structures body: error is less than 0.5%.
Highlights
Calculation of thermal fields is often based on the heat equation solution as well as thermal stresses definition, linked with calculation of cracking resistance massive of concrete in construction period [1,2]
The article examines the results of the analysis of the thermal stress state in construction period, which occurs in massive concrete ground slab height 1.0 m
According to the work [3,4,5, 9,10, 20,21,22] it is important to have knowledge of aspects having the greatest influence on data calculated while researching the thermal stressed state of massive concrete and reinforced structures
Summary
Calculation of thermal fields is often based on the heat equation solution as well as thermal stresses definition, linked with calculation of cracking resistance massive of concrete in construction period [1,2]. Basic data for describing and calculating the distribution of heat in a real structure consist of the following seven parameters: geometric shape and size of the structure; thermal performance of the material; the law of heat propagation inside the structure; initial conditions (block temperature at the time of the beginning of the calculation of the process of heat release); ambient temperature; conditions of heat exchange on the surface; cement exotherm [20]. N.A. Malinin [3] proposed a type of concrete relaxation function, which is used to record creep; I.D. Zaporozhets [9] described the process of heat dissipation of concrete by the equation, which is used when calculating the temperature change of hardening; A.V. Chekalkin [20] solved the problem of determining the thermally stressed state and the crack resistance of the foundation of a turbine unit using MCS, etc. Most authors agree that not taking into account one factor or another leads to significant errors in the calculations [1, 2, 8, 10, 13, 14, 20,21]
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