水电站厂房结构梁板柱系统动力特性研究

发布时间：2018-06-16 19:00

本文选题：水工结构 + 水电站厂房　；参考：《水利水电技术》2017年09期

【摘要】：为研究厂房不同楼板结构型式和立柱布置条件下梁板柱系统振动特性的差异,结合泸定水电站地面厂房的实际建立三维有限元模型,对梁板和厚板两种结构型式的自振特性和机组振动荷载下的振幅进行了研究。结果表明,在保证混凝土方量一致的前提下,梁板结构的自振频率略高于厚板结构。随着楼板厚度的增大或者立柱个数和截面尺寸的增加,楼板自振频率逐渐提高,机组动荷载作用下的结构振幅有所减小。但当楼板厚度达到一定值时,其自振频率的增加幅度和结构振幅的降低幅度越来越小。相对而言,增加立柱个数和截面尺寸比增加楼板厚度对楼板抗振更为有利,但有可能带来厂房布置上的困难。因此,实际工程中应综合考虑厂房结构混凝土方量、施工难度和结构布置等因素选择具体的楼板结构型式和立柱布置方案。
[Abstract]:In order to study the difference of vibration characteristics of beam-slab-column system under the conditions of different floor structure and vertical column arrangement, a three-dimensional finite element model is established for the ground powerhouse of Luding Hydropower Station. The natural vibration characteristics of beam plate and thick plate structure and the vibration amplitude of the unit under vibration load are studied. The results show that the natural vibration frequency of beam-slab structure is slightly higher than that of thick slab structure. With the increase of floor thickness or the number of columns and the size of section, the natural vibration frequency of floor increases gradually, and the vibration amplitude of the structure decreases under the dynamic load of the unit. However, when the floor thickness reaches a certain value, the increase of the natural vibration frequency and the decrease of the structure amplitude become smaller and smaller. In contrast, increasing the number of columns and section size is more favorable to the vibration resistance of the floor than increasing the thickness of the floor, but it may cause difficulties in the layout of the factory building. Therefore, concrete floor structure type and vertical column layout should be considered comprehensively in practical engineering, such as concrete square quantity, construction difficulty and structural arrangement.
【作者单位】：武汉大学水资源与水电工程科学国家重点实验室;中国电建集团成都勘测设计研究院有限公司;
【基金】：国家自然科学基金资助项目(51679175)
【分类号】：TV312

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