Mechanical Properties Of Large Diameter Circular Silos Based On Holistic Analysis

Concrete shallow cylindrical bin has been widely used in mineral transport, food collection and storage, logistics and other industries because of its environmental advantages, large capacity and small space occupied. At present, the development of the silo structure is toward to the directions of large capacity, light structure, fully enclosed green storage and automation, automation, electrification and multi-function. With the expansion of concrete application of shallow cylindrical bin, its diameter and height are also increasing, the huge reinforced concrete shallow cylindrical bin with the diameter greater than 100 meters. The study of silo structure studied by domestic and foreign scholars and researchers is also in growed, but the research of structure temperature effect under solar radiation of non-uniform temperature field and the temperature field, and most of the research are short of the comprehensive consideration of the influence factor of silo structure under the whole model because of separating the structure into two parts. Therefore, the distribution of non-uniform temperature field and the effect of temperature on silo structure analysis is of great significance, which is under the condition of solar radiation and heat exchange in the nature.The models of the huge concrete silo wall with the diameter of 120 m are established to analyze and compare with by using the finite element analysis method, including the upper net shell, the lower concrete structure and the whole model with the major foundation. Considering the three conditions of non-uniform temperature field, temperature field uniformity and permanent load to analyze and compare the static of silos overall finite element model finite element, which is on the basic of using the Fluent to analyze the radiation silos- flow- solid coupled thermal to obtain the results of the overall non-uniform temperature field under the condition of solar radiation. In addition, the mechanical properties of the silo affected by warehouse wall thickness parameters is discussed, which combine the overall model of the silo.The main results are as follows:1) Under conditions of solar radiation, at the same time,the temperature at the different positions of the silo; and in the same location, the temperature of the structure is not the same at different times. In the summer solstice, net steel shell gets the highest temperature at 12:00, which is 76.3 ?; the maximum temperature of warehouse wall concrete structure occurred at 16:00, which is 59.1 ?, the radiation reaction of the concrete structure is relatively slower than the steel.2) Non-uniform temperature field under the solar radiation is the most unfavorable temperature loads. The internal forces of silo ambient temperature can be considered as the 50% of the maximum tension ring of the permanent load in engineering in the absence of practical experience.3) With the increase of the thickness of the bulkhead, the bulkhead displacement and the ring axial force are significantly reduced, but the impact on the moment of the silo wall is smaller and the temperature effect will be enhanced. Appropriate to increase the thickness of the warehouse wall will help reduce the silo displacement and internal forces of the ring, but will also increase the influence of temperature effects.