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-  2016 

考虑炉体作用的塔式锅炉钢结构抗震性能分析

DOI: 10.11918/j.issn.0367-6234.2016.06.007

Keywords: 塔式锅炉钢结构,支撑钢框架,炉体作用,抗震性能,炉体止晃杆,偏心支撑
tower
,type,boiler,steel,structure,braced,steel,frame,action,of,boiler,seismic,behavior,steel,bar,used,to,inhibit,sway,of,boiler,eccentric,brace

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Abstract:

针对某1 000 MW褐煤塔式锅炉钢结构,为研究抗震分析中采用无炉体的简化结构模型(炉体对主钢架的地震作用通过在主钢架上施加炉体质量来实现)的可行性,重点考察了有、无炉体的结构抗震性能的差别.当有炉体时,还考察了主钢架与炉体间有、无止晃杆件两种情况下结构的抗震性能.分析表明:多遇地震下,结构均处于弹性.与有炉体结构相比,无炉体结构中主钢架的杆件应力较大;罕遇地震下,部分中心支撑受压失稳并有塑性发展,主钢架的偏心支撑无塑性发展,部分钢梁有轻微塑性发展,柱子基本处于弹性;止晃杆附近部分杆件受力较大,甚至有塑性发展,建议这些杆件的设计中考虑止晃杆传力的影响.多、罕遇地震下,主钢架层间侧移均小于规范限值.总体上,与有炉体的结构相比,无炉体的结构主钢架层间侧移和楼层侧移响应较大,表明采用无炉体的简化结构模型基本可行.
A simplified model for seismic analysis of a 1 000 MW tower type lignite boiler steel structure was studied, in which the mass of boiler is added to main steel structure replacing its seismic action. The seismic behavior differences among the simplified model and two models with boiler are studied. One of the two models with boiler used steel bars to inhibit sway of boiler. All of the models remain elastic under small earthquake actions, and the stress responses are the largest in simplified model. Under strong earthquake actions, some concentrically compression steel braces are buckling with plastic deformation and some beams have plastic deformations while eccentrically steel braces in the main steel structures and steel columns remains elastic. Some members near the steel bars develop plastic deformations due to the increased loads applied by the bars, which should be considered in design. Under both small and strong earthquake actions, inter-story deformations of the main structures are much smaller than the design code limits. Both lateral deformations and inter-story deformations of the main structures in the simplified model are the largest.

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