摘要
为了研究高耸烟囱在竖向地震作用下的动力响应特性,对180m钢筋混凝土烟囱和45m砖烟囱分别进行了1:40和 1:15比尺的振动台模拟试验研究,并采用波动理论对试验模型进行了动力比较分析。试验和理论分析结果表明:竖向地 震作用下,高耸烟囱的地震响应以一阶竖向振动为主,最大应变随地震烈度的增加逐渐从顶部附近向下移动到1／3-1／2 高度附近;水平地震作用下高耸烟囱以二阶以上振型振动为主,最大应变部位在2／3高度附近。针对烟囱结构薄弱部位随 地震烈度的变化情况,进一步阐明了计算高柔结构和特定条件下某些结构的竖向地震作用的必要性。
To study the fracture phenomenon of highrise chimney subjected to vertical seismic action, a 1/40 resinous model for 180 m high concrete chimney and a 1/15 plaster model for 45 m high brick chimney were made with dynamic test performed. A wave motion formula was derived for comparison. The test results and the analytical study showed that the vertical seismic response can be obtained from the first order mode vibration whereas the horizontal dynamic response is mainly induced by second and higher order chimney modes. It was indicated that the maximum vertical strain varies from upper part to 1/3 to 1/2 height of chimney with the increasing of seismic intensity, and the necessity of taking vertical seismic action into account in highrise structure design is emphasized.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2005年第2期87-93,共7页
Journal of Building Structures
基金
辽宁省自然科学基金资助项目(20022130)
