地震作用下散体堆料与结构的相互作用研究

发布时间：2018-07-24 08:57

【摘要】：脱硫脱硝工程建筑结构与一般的工业建筑不同,存在其特定的功能性和结构特殊性。在火力发电厂脱硫工艺厂房中,通常用于贮存脱硫石膏的石膏库与脱水楼框架结构一起建设。湿法脱硫的副产品石膏作为一种常见的散粒体材料,与结构相互作用具有普遍性。目前国内外对散粒体与筒仓结构相互作用研究较多,而对散粒体与挡料墙结构相互作用研究较少。本文考虑散粒体堆料与结构相互作用,对脱硫工程中的石膏库挡料墙的设计常见和关键问题进行深入研究。本文采用有限元数值模拟软件ANSYS,对散粒体与结构相互作用进行了分析与探究。研究了静力及动力作用下,墙柱一体式挡料墙、配筋地坪挡料墙和组合受力无基础钢筋混凝土挡料墙三种型式挡料墙,上部框架结构受力特性及墙体受力特性的差异,并研究了地震作用下堆料对上部框架结构受力及墙体受力性能的影响。主要研究结论如下:(1)静力作用下,改变挡料墙的结构型式对上部框架结构的受力几乎无影响,但对墙体以及与墙体连接的底部框架柱影响很大。墙柱一体式挡料墙与组合受力无基础挡料墙相比,框架柱底部剪力减小近1倍。而配筋地坪挡料墙与组合受力无基础挡料墙相比,框架柱底部剪力减小约25%,可在一定程度上改善底部框架柱截面过大的问题。(2)水平地震作用下,堆料的存在影响上部框架结构的受力及变形,但随着结构高度的增加,堆料产生的影响逐渐减小,对于挡料墙上部15 m以上框架结构的影响可以忽略不计。但堆料对底部框架柱受力影响很大,堆料使得底部框架柱剪力极值增大了近3倍,弯矩极值增大了2倍左右。(3)由于挡料墙抗侧刚度很大,水平地震作用下,改变挡料墙结构型式对上部框架结构的影响很小,但对于和挡料墙浇筑在一起的底部框架柱影响明显。配筋地坪挡料墙底部剪力极值比组合受力无基础挡料墙减少了约1/3,墙身拉应力极值减小了约50%,压应力极值减小40%左右。
[Abstract]:The building structure of desulphurization and denitrification project is different from the general industrial building, and has its special function and structure particularity. In the desulfurization plant of thermal power plant, gypsum storehouse which is usually used to store desulphurization gypsum is built together with the frame structure of dehydration building. As a common granular material, gypsum, a by-product of wet desulfurization, has universal interaction with structure. At present, there are more researches on the interaction between granular and silo structure, but less on the interaction between granular and retaining wall structure. In this paper, the common and key problems in the design of retaining wall of gypsum depot in desulphurization engineering are studied by considering the interaction between bulk material and structure. In this paper, the finite element numerical simulation software ANSYSis is used to analyze and explore the interaction between particle and structure. Under static and dynamic action, the differences of three types of retaining wall, I. e., integrated retaining wall of wall and column, reinforced concrete retaining wall and reinforced concrete retaining wall under combined force, the stress characteristics of upper frame structure and the mechanical characteristics of wall are studied. The influence of pile material on the mechanical behavior of upper frame structure and wall is also studied. The main conclusions are as follows: (1) under the static action, changing the structure type of the retaining wall has little effect on the force of the superframe structure, but it has great influence on the wall and the bottom frame column connected with the wall. The shear force at the bottom of the frame column is nearly twice less than that of the composite retaining wall without foundation. Compared with the composite retaining wall without foundation, the shear force at the bottom of the frame column is reduced by about 25%, which can improve the problem that the section of the bottom frame column is too large to some extent. (2) under horizontal earthquake, The influence of stowage on the stress and deformation of the upper frame structure decreases gradually with the increase of the height of the structure, and the influence on the frame structure above 15 m on the retaining wall can be neglected. However, the pile material has a great influence on the stress of the bottom frame column, which makes the shear extreme value of the bottom frame column increase nearly 3 times, and the bending moment extremum increase about 2 times. (3) because of the great lateral stiffness of the retaining wall, under the horizontal earthquake, the shear extreme value of the bottom frame column is increased by nearly 3 times, and the bending moment extreme value increases by about 2 times. Changing the type of retaining wall has little effect on the upper frame structure, but it has an obvious effect on the bottom frame column which is casted together with the retaining wall. The shear extreme value at the bottom of the reinforced floor retaining wall is about 1 / 3 less than that of the combined force without foundation retaining wall, the maximum value of the wall body tensile stress is reduced by about 50%, and the compressive stress extreme value is reduced by about 40%.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU318

【参考文献】