Temperature Load And Storage Material Load Finite Element Analysis Of Large-diameter Reinforced Concrete Silo

In modern production practice of many fields, reinforced concrete silos have been widely used due to its predominance such as warehouse capacity, the small size of land occupied and high economical efficiency in use. In recent years, with the great development of design technique and construction technique, reinforced concrete silos have been greatly improved in its diameter and depth. However, up to the present, the stressed state of silo thermal stress as well as temperature load-storage material load static force coupling analysis have not been adequately researched. Based on a actual project of large-diameter reinforced concrete silo, the author principally carry out a research as following, by means of a large amount of document and information:1) According to the actual project, a finite element model is formed by use of the finite element analysis software ANSYS. In accordance with the details of 'Code for Design of Reinforced Concrete Silos', with the addition of some appropriate calculation parameters that are conscientiously selected, silo finite element analysis of overall structure static force caused by bin storage, has been carried out.2) With the help of some documents about thermal analysis, two types of ansys thermal-structural material load static force coupling finite element analysis in case of inside and outside differences in temperature for large reinforced concrete silo, have been emphasizedly carried out. Afterward, each solution result is respectively analyzed and compared.3) With respect to three typical operating modes in case of seasonal temperature difference and solar radiation temperature difference, ansys thermal-structural static force coupling finite element analysis has also been carried out. Afterwards, each solution result is also respectively analyzed and compared.The results showed that:In some cases, silo thermal stress and the influence caused by it on structure can not be ignored in the actual construction practice; For silo structures which have inside and outside differences in temperature , if difference value of inside and outside temperature gets larger, the caused displacement will be larger, as well as the state of stress becomes also greater. Some measures should be taken to adjust to real situation in design. For silo structures which have seasonal temperature difference, compared with the former inside and outside differences in temperature, the caused displacement is larger, however, the influence on stress is much lower. If the silo lies in a place with heavy sunlight, solar radiation temperature difference can not be neglected, especially for displacement and external wall stress. With respect to temperature load-storage material load coupling finite element analysis results of all above three types of differences in temperature, some conclusions can be made by a analysis and comparison: a great inside and outside differences in temperature is the mainest one among all of the temperature loads. Not only is it widely distributed, but also circumferential reinforcement of silo-wall should be enhanced. At the same time, according to the local actual climatic situation, as influence of other types of thermal loads on whole structure or some of parts can be taken into account totally, the most unfavorable working condition will be got by comprehensive application.Based on temperature load-storage material load static force coupling analysis of the large diameter concrete silos, some suggestions can be provided for the research of the similar project in future.