摘要
空冷凝汽器支架结构是一种新型的火电厂结构体系,该体系由钢筋混凝土管柱和上部钢桁架组成,质量和刚度沿竖向分布严重不均,抗震措施单一。该类结构体系与电厂能否正常运作关系紧密,若震后结构发生破坏会引起极大危害。为提高该类结构的抗震能力,本文在钢桁架和管柱连接处加设铅芯橡胶隔震支座。采用SAP2000分析软件,验证了隔震支座的可行性,并进行8度罕遇地震作用下的弹塑性时程分析,获得了强震作用下钢桁架与管柱的加速度、隔震支座的变形及受力、管柱的塑性发展状况。研究结果表明:隔震支座在地震发生时能够充分发挥作用,减震效果良好;在保证柱子本身安全的前提下,采取隔震支座后的柱顶水平剪力较普通结构明显变小;上部钢桁架整体加速度值减小,这对上部布置大量设备的空冷支架结构体系是有利的,能够满足高烈度区大容量机组的抗震要求。
Air-cooled condenser support structure system is a new structural system of thermal power plant, which is formed by reinforced concrete pipe column and steel truss, and because of the uneven distribution of quality and stiffness in vertical direction, earthquake measures of the structure is poor. The structure has a close relationship with the running of power plant, so great harm would be caused if the structure collapsed under earthquake. This paper uses software SAP2000 to verify the feasibility of lead rubber bearings which are set up between reinforced concrete pipe column and steel truss, and through elastoptastic time-history analysis under seldom occurring earth- quake of Intensity 8 （400 Gal ） , we obtain the acceleration of pipe column and steel truss, the deformation and stress of isolation bearings, plastic development of pipe column under strong earthquake action. The results show that： damping effect of isolation bearings is good and could play an important role in the earthquake; taking the safety of pipe columns themselves as the premise, horizontal shear of top of the column becomes smaller obviously with help of the isolation bearings ; acceleration of upper steel truss is significantly reduced which is favorable to the air-cooled condenser structure system that bearing the numerous devices, and the seismic requirements could be satisfied in the high earthquake intensity area.
出处
《世界地震工程》
CSCD
北大核心
2017年第2期232-240,共9页
World Earthquake Engineering
基金
国家自然科学基金(50978216)
关键词
空冷支架结构体系
铅芯橡胶隔震支座
弹塑性地震分析
时程分析
减震系数
air-cooled condenser support structure system
lead-plug rubber isolation bearings
elastoplastic seismi-canalysis
time history analysis
seismic reduction coefficient
