【摘要】 空冷支架结构体型独特,属典型的上刚下柔型结构,且质量80%集中在上部,抗震及抗风计算非常重要,虽然结构物的固有频率及振型可以通过结构动力学的原理计算得到,由于实际结构受组成材料、周围结构等因素影响,经过简化的计算简图与实际结构总有一定的差异,因而计算值与实际值一般有较大的误差。文中对神木的三跨结构采用脉动法进行现场测试,得到结构实际的动力特性数据,包括结构的自振频率、振型等,并和计算数据进行对比,提出了在抗震设计中应注意的问题。更多还原

【Abstract】 The calculation of seismic and wind resistance capacity is very important for a direct dry-cooled condenser structure system,which is a typical up-rigid-down-soft structure with 80% mass lumped at top.Although the frequency and vibration mode of the structure can be obtained from the structural dynamics,there are always some difference between the calculating results and actual testing results of the structure due to the affection of composing materials and surrounding structures.The real dynamic characteristics of the three span wind-cooled condenser structure were measured by using microtremor method in field tests.The data are compared with calculation results,and some suggestions are also presented for seismic design of the structure.更多还原