古砖砌体冻融循环下轴心受压试验及超声波测试  

Axial Compression Test and Ultrasonic Test of Ancient Brick Masonry under Freeze-thaw Cycles

作　　者：孙磊 汤永净[1,2] SUN Lei;TANG Yongjing(Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Geotechnical and Underground Engineering(Tongji University),Ministry of Education,Shanghai 200092,China)

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]同济岩土及地下工程教育部重点实验室,上海200092

出　　处：《结构工程师》2018年第4期128-134,共7页Structural Engineers

基　　金：国家自然科学基金资助项目(51278359)

摘　　要：冻融作用会对寒冷地区的古建筑砖砌体造成不可逆的劣化,抗压强度和弹性模量的变化可以反映砌体的劣化程度。通过气候环境模拟室内对古砖砌体试件进行冻融循环试验,将试验后的砌体试件进行轴心受压试验,结果显示抗压强度和弹性模量随冻融次数的增加先增后减。同时对古砖砌体试件进行超声波测试,得到不同类型测点的超声波波速不同、冻融作用会导致古砖砌体的波速下降;根据测试结果,对超声波波速与古砖砌体弹性模量和抗压强度的关系进行了讨论。Freeze-thaw action might lead to irreversible deterioration on ancient brick masonry buildings in cold areas.The variation of compressive strength and elastic modulus reflects the deterioration of the masonry.The ancient brick masonry specimens were put in the environmental chamber to carry out freeze-thaw cycle test.After the test,axial compression test was conducted on each masonry specimen.With the growth of freeze-thaw cycles,compressive strength and elastic modulus firstly increase and then decrease.Ultrasonic test was conducted on ancient brick masonry as well.Its test data indicates that ultrasonic velocity changes in the position of testing point,and freeze-thaw action will result in the reduction of ultrasonic velocity.Besides,this paper discusses the relationship of ultrasonic velocity,compressive strength and elastic modulus.

关 键 词：冻融 古砖砌体 轴心受压试验 超声波测试 

分 类 号：TU364[建筑科学—结构工程]