| With the development of electric power,chemical industry,coal and other industries in China and the improvement of the state environmental protection requirements,large capacity of dry coal shed or totally enclosed coal storage yard has become a necessary product.The high and low span cylindrical roof structure has always been the first choice of design application,because it can meet the operation space of stacker and the unit area cost is relatively low.However,due to the limitation of span and length,the capacity of a single building structure is within a certain range,which cannot meet the requirements of coal heap capacity of large units and large coal mines.Therefore,the layout scheme of using two single dry coal shed is adopted to solve the problem.At present,the wind resistance studies of cylinder roof have focused on single span roof and the double span cylinder roof of equal height.In the case of the less existing research of the unequal-height cylindrical roof about wind load,it is necessary that it was taken as the research object,and use wind tunnel test method to explore the wind load characteristic of the unequal-height cylindrical roof in this paper.At the same time,for the wind resistance design of roof area was carried out more accurately,the internal pressure of roof structure is studied by numerical simulation,and the method of connecting k-means clustering algorithm with SD validity index is used to partition the wind pressure of the roof.The main content has the following aspects.(1)The wind tunnel test is used to test and study the average wind pressure,pulsating wind pressure and the extreme wind pressure at the full wind direction angle on the surface of the cylindrical roof,and were compared and analyzed with wind pressure of the single-span and equal-height double-span cylindrical roof.For the unequal-height span cylindrical roof structure,it found that the high span part and the low span part have significant influence on each other.In addition,there will be reciprocating positive pressure area at the junction of unequal-height roof,which should be noted in the design.(2)Based on the large-scale unequal-height cylindrical roof structure,at the same time,the numerical simulation is used to study the wind pressure distribution rule of the single-span cylinder roof,and the result of the simulation is contrasted with the related wind tunnel test result,studying the distribution characteristics of internal pressure in single-span and unequal-height span cylindrical roof.(3)In this paper,k-means clustering method and the SD effectiveness index are used to determine the optimal k value for the wind pressure partition study of the high and low span cylindrical roof,and conclude the partition type numbers,partition form and the wind pressure coefficient of each area about the average wind pressure,extreme wind pressure coefficient of this kind of roof surface,and the partitioning method can be applied to other structures. |
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