摘要
研究水电站厂房屋架与上下游排架柱在不同连接方式下的动力特性,分别采用虚拟介质法(方案一)以及上游端简支、下游端铰支座(方案二)的两种螺栓连接模拟方式进行对比分析,计算厂房自振、在机组以及地震荷载作用下的动力响应。自振特性分析得出方案二提高了上部结构的刚度,但整体频率小,方案一更符合实际;在机组振动荷载作用下,上部观测点采用方案二时总位移最小,其余观测点采用方案一时总位移最小。对于厂房整体结构,方案一有利于减小结构的拉应力;在双向地震荷载作用下,方案一发电机层楼板以下最大动位移大于方案二,其余观测点小于方案二。综合比较厂房结构的振动反应,当屋架和排架结构间采用虚拟介质法模拟螺栓连接时,在机组和地震荷载作用下位移和应力响应峰值总体较小,抗振性能更好。
In order to analyze the dynamic characteristics of different connection methods of roof truss of hydropower station and the bent columns of upstream and downstream, two bolt connection simulation methods of the virtual medium method(scheme I) and upstream end simple support, downstream end hinge support(scheme II) are used respectively, the dynamic response of the power house under the action of the natural vibration, the unit and the earthquake load is calculated. According to the analysis of the natural vibration characteristics, scheme II improves the rigidity of the upper structure, but the overall frequency is small, so scheme I is more practical;under the vibration load of the unit, the total displacement of the upper observation point is the smallest when scheme II is adopted, and the total displacement of the other observation points is the smallest when scheme I is adopted. For the overall structure of the plant, scheme I is beneficial to reduce the tensile stress of the structure;Under the action of two-way seismic load, the maximum dynamic displacement under the generator floor of scheme I is greater than that of scheme II, and the other observation points are less than that of scheme II. When the virtual medium method is used to simulate the bolt connection between the roof truss and bent structure, the peak value of displacement and stress response under the action of unit and earthquake load is smaller and the anti-vibration performance is better.
作者
冯振松
马震岳
FENG Zhensong;MA Zhenyue(Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian,Liaoning 116024,China)
出处
《水利与建筑工程学报》
2020年第1期187-192,共6页
Journal of Water Resources and Architectural Engineering
基金
国家重大研发计划资助项目(2016YFC0401900)。
关键词
水电站厂房
虚拟介质法
动力响应
抗振性能
hydropower plant
virtual medium method
dynamic response
anti-vibration performance
