摘要
火电厂中的脱硝钢架由于其高度较高、外形不规则,风荷载是其承受的主要荷载之一。为确保该类结构风荷载的正确评估,以某典型脱硝钢架为研究对象,基于流固耦合理论,利用数值风洞方法对脱硝钢架结构表面体型系数及风致响应进行了研究。根据刚度与质量等效的原则,提出了复杂脱硝钢架结构连续体模型的简化方法,模型简化前后的1阶自振周期与振型接近,可近似模拟原结构的平动情况。风向角的变化对迎风面及变截面处体型系数的影响较大,可以忽略风向角对侧面及顶面体型系数的影响。在0°风向角工况下,结构的位移与应力极值均显著大于90°风向角工况。因此,0°风向对于结构而言为相对较不利风向,在脱销钢架整体结构方向布置时应予以避免。
In thermal power plants,the height of the denitration steel frame is high and the shape is irregular,and wind load is one of the main loads on the denitration steel frame.In order to ensure the correct assessment of the wind load of the structure,a typical denitration steel frame structure was taken as a study subject.Based on the fluid-solid coupling theory,the shape coefficient and wind-induced response of the denitration steel frame structure were studied using the numerical wind tunnel method.According to the principle of equivalence of stiffness and mass,a simplified method for the continuum model of complex denitration steel frame structure is proposed.The first-order natural period of the simplified model is close to that of the original model.The simplified model can be used to simulate the translation of the original structure.The change in wind direction angle has a great influence on the shape coefficient of the windward face and the variable cross-section.The influence of wind direction angle on the shape coefficient of the side and the top can be ignored.The maximum displacement and stress of the structure under the condition of 0°wind direction angle are significantly greater than those under the condition of 90°wind direction angle.Therefore,0°is a relatively unfavorable wind direction for the structure.When the denitration steel frame is arranged in the direction of the overall structure,0°should be avoided.
作者
劳俊
王希慧
宋波
李陈阳
LAO Jun;WANG Xihui;SONG Bo;LI Chenyang(China Energy Longyuan Environmental Protection Co.,Ltd.,Beijing 100039,China;School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;Beijing International Cooperation Base for Science and Technology-Aseismic Research of the Rail Transit Engineering in the Strong Motion Area,Beijing 100083,China)
出处
《防灾减灾工程学报》
CSCD
北大核心
2022年第3期534-541,共8页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家自然科学基金项目(52078038)资助。
关键词
脱硝钢架
风向角
数值风洞
体型系数
风致响应
denitration steel frame
wind direction
numerical wind tunnel
shape coefficient
wind-induced response
