摘要
以某大型水电站为工程实例,为研究板梁结构、等方量厚板结构和等静力刚度厚板结构三种形式楼板结构振动特性的差异,建立地下厂房三维有限元模型进行不同楼板结构动力特性的对比分析。结果表明:在机组动荷载作用下,不同形式楼板结构的动力响应差别并不明显;在脉动水压力作用下,当荷载频率接近楼板低阶自振频率时,板梁结构振幅较小,有一定优越性,但从总体上评价,特别是在高频区域,厚板结构的振幅更小,抗振性能更好。
Taking a large hydropower station as an example,in order to study the differences between the dynamic characteristics of beam-slab structure,thick-slab structure with the same concrete volume and thick-slab structure with the same static stiffness,a three dimensional finite element model of the underground powerhouse was established to analyze the dynamic characteristics of different types of floor slab.The results show that,under the action of units＇ dynamic loads,differences between dynamic responses of each type floor slab are not obvious.Under the pulsation pressure,when the load frequency is close to the low order natural frequencies of the floor slab,vibration amplitude of beam-slab structure is lower than that of thick-slab structure,however,in general,especially in highfrequency region,the anti-vibration performance of thick-slab structure is better than that of beam-slab structure.
出处
《水利与建筑工程学报》
2016年第3期177-181,191,共6页
Journal of Water Resources and Architectural Engineering
基金
国家自然科学基金项目(51379030)
