某宋代砖塔结构整体损伤识别分析

为研究陕西省蒲城县崇寿寺宋代古塔的动力特性及结构整体损伤,应用动态测试系统对该塔在环境激励下的振动响应进行测试,对测试结果进行时域及频域分析,得到了结构沿水平方向振动的前3阶频率、振型及阻尼比;建立崇寿寺塔的有限元模型计算结构的动力特性,通过调整计算参数,使计算结果与测试结果一致,得到了结构的宏观等效弹性模量,依据该模量通过模态刚度定义损伤判别指标,对崇寿寺塔结构损伤进行评定。结果表明,当结构楼层弹性模量随高度增加逐渐增大时,数值计算各阶频率均与测试结果接近,表明崇寿寺塔结构宏观损伤在首层较为严重。因此,通过对比古塔动力特性测试结果与数值计算结果,可实现对结构整体损伤进行评定。

Analysis of Integrated Damage for a Masonry Pagoda Built in Song Dynasty

In order to solve the problems of secondary contamination of sampling ports, single monito-ring parameters, difficulty in continuous on-line monitoring, and labor cost, the on-line monitoringsystem was modified by installing on-line monitoring instruments in the lubricating oil system. Thelubricating oil on-line monitoring system of steam turbine has been reformed to realize the on-linemonitoring function of steam turbine lubricating oil system. The improvement reduced the personnelworkload of oil quality inspection , changed the replacement method of lubricating oil, saved the costof oil products, and provided a reference for the optimization of lubrication system of the same type of unit.