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Mass concrete equipment foundations Experimental research force

Author: LiaoXiuFeng
Tutor: LaiMing
School: Chongqing University
Course: Engineering Mechanics
Keywords: Mass concrete Equipment foundation Reinforcement ratio Temperature Mechanical behavior Study
CLC: TU476
Type: Master's thesis
Year: 2008
Downloads: 59
Quote: 0
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Abstract


Equipment foundation is widely used in metallurgical industry engineering fields, such as mass concrete foundation often based pouring heat of hydration due to the release and have a greater high temperature stress, the device runs on the basis of the impact of high temperature can not be ignored, Furthermore foundation also bear a larger external load, working conditions more complicated. But there is no corresponding equipment foundation design specifications, design is often based on general considerations, reinforced with reference to the current \the remaining parts of the press structure reinforcement, which inevitably with the large volume of concrete equipment base is inconsistent characteristics. Based on this, the basis for the device by the force characteristics of the pre-trial research. This foundation completed 3 blast stove specimens and base 2 of the test specimens. Design, each test piece full advantage of its symmetry, the layout of the reinforcement ratio but with different diameters or grade of steel; experiment, considering the temperature and the type of ground conditions on the properties of the specimen. Through comparative analysis of steel and concrete strain curve, to carry out the law as well as cracks in the specimen damage, initial grasp of the impact of temperature on the specimen, and the different situations based on the mechanical properties. The main conclusions are: ① heat of hydration of the specimen through monitoring, preliminary exploration of the internal heat of hydration in the distribution of the specimen; ② from the test shows that the external temperature of the specimen in contact with the heat source only parts of the overall mechanical properties have little effect; ③ blast round the top of the specimen base station based on the outside temperature and the hot stove action position, structural reinforcement configurations in addition to considering heat of hydration, shrinkage, etc. cracking of the specimen, also in consideration of the influence of the external temperature, strengthening reinforcement; ④ phenomena through experiments and data analysis of the specimen transfer mechanism, base and blast stove based power transmission sector can be approximately equivalent to a beam and truss model space consisting of power transmission sector; ⑤ at the position of the specimen holder upper easily there is a big negative moment and variable cross-section of the specimen at the specimen is often the weak link in the top like a blast furnace base and cap frustum intersection area; In view of the above points, this paper put forward the following equipment foundation design recommendations: According to the distribution of heat of hydration, the internal layout of the base steel mesh is necessary; may be appropriate to reduce the minimum reinforcement ratio of the current design values, reinforcement underside of the specimen should not be used even fabric reinforcement approach should be based on the theory of STMs optimized layout, proposed within the scope of the pile diameter steel strengthening; top of the structural reinforcement in the negative moment should be larger and variable cross-section of the site to enhance reinforcement.

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Foundation > The basis of the special form
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