多层钢筋混凝土筛分车间振动问题的一般处理方法

发布时间：2018-01-11 15:01

本文关键词：多层钢筋混凝土筛分车间振动问题的一般处理方法　出处：《西安建筑科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：筛分车间承受内部和外部两类激振源的共同作用,结构工作环境不同,两类激振源对结构响应的影响程度不同。由于生产工艺布置及工作环境的要求,筛分车间结构型式为多层钢筋混凝土框架结构。动力设备的运转会引起结构整体水平方向振动和局部楼盖振动,导致结构安全和使用性能丧失,经济效益下降等。如何快速有效的解决多层钢筋混凝土筛分车间的振动问题,目前没有统一、适用的方法和解决思路。另外,应经济增长和发展的需要,实际工程中同一楼层布置多台动力设备的现象已比较普遍,多台设备的振动合成问题值得探究。本文旨在为解决实际工程振动问题提出一个可靠、可行的解决方法,并且探究了多台设备相互影响的振动合成。以典型代表形式武钢焦化炼焦三分厂的筛焦楼为例,采用定性和定量两步骤分析方法,在实测结构动力特性和动力响应的基础上,利用SAP2000建立结构整体和局部楼盖两阶段有限元模型,分析筛焦楼结构动力特性,初步判断结构振动问题出现的原因;结构承受的主要激励为两台振动筛运转产生的简谐扰力,通过对有限元模型的动力时程分析,定量分析结构动力响应量,与实测结果比较吻合,表明利用SAP2000分析多层钢筋混凝土筛分车间的振动问题是可行的。对于多台设备相互影响下,某点的振动合成问题可以通过振幅叠加的概率方法确定,供结构设计人员参考。由于楼盖结构构件截面尺寸偏小,振动筛运转频率与楼盖自振频率相差7%,且振动筛激振力较大和连接不可靠,使得结构动力响应过大。采用增大截面法和外包钢法对楼盖进行加固,增大楼盖刚度以有效抵抗激振力,且楼盖频率远离设备的运转频率,降低激振力对结构的影响。实际使用也表明,此方法是行之有效的,加固后筛焦楼使用良好,楼盖振动满足容许标准,现场操作人员无振感。
[Abstract]:The sieve workshop bears the common action of the internal and external exciting sources, the structure working environment is different, the influence degree of the two kinds of exciting sources on the structure response is different, because of the production process arrangement and the working environment request. The sieve workshop structure type is multi-story reinforced concrete frame structure. The operation of power equipment will cause the whole horizontal vibration and local floor vibration of the structure, resulting in structural safety and loss of performance. How to solve the vibration problem of multi-story reinforced concrete sieving workshop quickly and effectively, there are no unified, applicable methods and solutions. In addition, the needs of economic growth and development should be met. The phenomenon that multiple power equipment is arranged on the same floor in practical engineering is quite common, and the problem of vibration synthesis of many equipments is worth exploring. This paper aims to put forward a reliable solution to the vibration problem of practical engineering. The feasible solution, and explore the vibration synthesis of the interaction of many equipment. Taking the typical representative form of the third coking plant of WISCO as an example, the qualitative and quantitative two-step analysis method is adopted. Based on the measured dynamic characteristics and dynamic response of the structure, a two-stage finite element model of the whole and local floors of the structure is established by using SAP2000 to analyze the dynamic characteristics of the sieve coke building structure. The causes of structural vibration problems are preliminarily judged. The main excitation of the structure is the harmonic disturbance produced by the operation of the two vibrating sieves. Through the dynamic time history analysis of the finite element model, the dynamic response of the structure is quantitatively analyzed, which is in good agreement with the measured results. It shows that it is feasible to use SAP2000 to analyze the vibration problem of multi-story reinforced concrete sieving workshop. The vibration synthesis problem of a certain point can be determined by the probability method of amplitude superposition, which can be used as a reference for structural designers. Because of the small section size of floor structure members, the operating frequency of vibrating screen is 7% different from that of floor natural vibration frequency. Moreover, the vibration force of the vibrating screen is large and the connection is unreliable, which makes the dynamic response of the structure too large. The reinforced floor is strengthened by the method of increasing cross section and the method of external steel, and the stiffness of the floor is increased to effectively resist the exciting force. The floor frequency is far away from the operating frequency of the equipment and the influence of the exciting force on the structure is reduced. The practical application also shows that this method is effective, the reinforced screen coke building is in good use, and the floor vibration meets the allowable standard. Site operator without vibration.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU375;TU311.3

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