适用于核电厂常规岛汽机主厂房的型钢混凝土框排架混合结构是一种新型主厂房结构体系。由于工艺的要求，其在结构布置、荷载大小与分布等方面与传统火电厂“三列式”主厂房有较大差异。因此，对该种结构体系电厂汽机主厂房的动力特性进行研究，可以作为后续确定模型结构抗震性能拟动力试验加载比的依据，同时也是解决工程共振、结构抗震计算、判断建筑结构累积损伤的基础。首先，以某1400MW电厂型钢混凝土框排架混合结构汽机主厂房为原型结构，选取含有汽机跨、除氧间两跨三榀子结构，按照1/7缩尺比制作试验模型，并通过锤击法获得模型结构的周期、振型、阻尼比等；其次，动力特性实测开始之前，采用ABAQUS建立了试验结构的有限元模型，预估了模型结构的动力特性参数，试验后通过对比表明：有限元计算结果与试验实测结果吻合，验证了有限元计算方法与动力特性试验的正确性；最后，建立了12榀原型结构的有限元模型，进行了模态分析，验证了模型结构与原型结构相似关系的正确性，研究了整体结构的动力特性以及结构基本周期与阻尼的变化规律。相关研究结果可为型钢混凝土框排架混合结构汽机主厂房的推广应用提供基础。
Abstract
A Steel reinforced concrete(SRC)framebent hybrid structure which is suitable for conventional island of nuclear power plant is a new kind of turbine main factory building structure. Compared with the traditional “threerow” main factory building of a thermal power plant，the structural layout, load magnitude，load distribution and other aspects of the main factory building of the nuclear power plant are distinctly different due to the requirements of technological process. Therefore, researches on the dynamic behavior of the turbine main factory buildings which adopt the steel reinforced concrete framebent hybrid structure can be used as the guidance to determine the load ratio of the model pseudodynamic test and to solve some engineering problems such as structure resonance，aseismic calculation, and cumulative damage. First of all, a 1 400 MW steel reinforced concrete framebent hybrid main factory building structure was taken as the prototype and the representative substructure which included deaerator bay and turbine house was chosen as the model structure. Then, the model structure was manufactured according to the 1/7 scale and dynamic characteristic parameters such as period, vibration mode, damping ratio were tested through the hammering method. Before the test, a finite element model of the test specimen was established by ABAQUS and its dynamic characteristic parameters were calculated as well. The test results demonstrate that the finite element calculation results agree well with the test results and the finite element modeling method is reasonable. Finally, finite element model of the prototype structure was established and the dynamic behaviors of the overall structure were calculated. In addition, the correctness of the scale factors between the model structure and the prototype structure was verified and the changing rule of the fundamental period and damping were analyzed. Related research results can provide basis for the application of steel reinforced concrete framebent hybrid main factory building structure.
关键词
型钢混凝土框排架混合结构 /
汽机主厂房 /
动力特性 /
模态试验 /
有限元分析
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Key words
steel reinforced concrete frame-bent hybrid structure /
main factory buildings /
dynamic characteristics /
model test /
finite element analysis
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