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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.
For a 1 000 MW lignite steel tower boiler structure, in order to study the seismic analysis using a simplified structure model without furnace (furnace body on the main steel frame seismic effect by applying the furnace body mass to achieve) is feasible The difference of the seismic performance of the structure with and without the furnace body is investigated emphatically.When there is a furnace body, the anti-seismic performance of the structure under both the presence of the main steel frame and the furnace body and the non-stop beam are also investigated. The results show that the structure is elastic under the frequent earthquakes.Compared with the furnace structure, the stress of the rod of the main steel frame in the furnaceless structure is larger than that in the case of rare earthquakes. Development, the eccentric support of the main steel frame has no plasticity development, some of the steel girders have slight plasticity development, and the posts are basically in elasticity; part of the rod near the stop rod is subject to greater force and even plasticity development. It is suggested that the design of these rods be considered The effect of stopping force of stopping rod is more than that of rare earthquakes, and the lateral displacement of main steel frame is less than the standard limit in rare earthquakes.In general, compared with the structure with furnace body, Sideshift and floor sideshift response is larger, indicating the use of simplified structure model without the basic body Row.