非饱水冻融作用下的古砖动弹性模量.pdf

第37卷第6期
土木建筑与环境工程
Vol 37 No 6
2015年12月
Journal of Civil, Architectural & Environmental Engineering
Dec.2015
doi:10.11835/j.issn.1674-4764.2015.06.001
ロロ
非饱水冻融作用下的古砖动弹性模量
汤永净,邵振东
(1.同济大学土木工程学院,教育部岩土与地下工程重点实验室,上海200092;
2.上海仰韶古建筑保护科技发展有限公司,上海200092)
摘要:弹性模蚤是反映材料刚度的重要指标。自然界中雨淋和冻融导致古建筑砌体砖处于非饱
水冻融状态。通过大气环境实验舱对古砖进行非饱水冻融作用下的饱和系数、饱水度、动弹性模
量、相对动弹性模量等技术参数实验,分析了非饱水冻融作用下古砖弹性模量变化规律。实验结果
表明,饱水度大于等于60%时,非饱水冻融导致古砖试件动弹性模量和相对动弹性模量数值均出现
明显下降趋势;饱水度小于60%时,非饱水冻融对动弹性模量和相对动弹性模量数值影响較小。非
饱水冻融作用下,古砖的初始抵抗风化能力大小是影响动弹性模量和相对动弹性模量数值的重要
因素。同时,对非饱水冻融作用下反映古破抵抗冻融损伤能力的极限饱水程度等关鍵参数进行了
讨论。
关键词:非饱和水;冻融;饱水度;动弹性模量;饱和系数
中图分类号:TU522
文献标志码:A文章编号:1674-4764(2015)06-0001-06
Dynamic elastic modulus based on unsaturated water
freeze-thaw action for ancient bricks
Tang Yongj/ing, Shao Zhendong
(1. College of Civil Engineering; Key Iaboratory of Geotechincal and Underground Engineering(Tongji University
Ministry of Education, Tongji University, Shanghai 200092, P. R. China; 2. Shanghai YANHSHAO Protection o
Ancient Building Technology Development Co, Ltd, Shanghai 200092, P. R. China
Abstract: Elastic modulus is one of the most important indexes to reflect material stiffness. Raining and
freeze-thaw lead brick masonry to be in the state of unsaturated water freezc-thaw. The experiment aims to
obtain the elastic modulus of ancient bricks under various unsaturated water freeze-thaw The brick
samples were put in the environmental chamber to carry out raining and freeze-thaw action. The experiment
including saturated coefficient, saturated degree, dynamic elastic modulus and relative elastic modulus were
carried out for these samples. Results show that the dynamic elastic modulus of the samples obviously
decreases when saturated degree is equal to or larger than 60%; the elastic modulus of the samples have no
significant change when saturated degree is less than 60%, and the samples break when their saturated
degree reached a certain value. This paper also discusses parameters like limit saturated degree, which
收稿日期:2015-07-30
基金项目:国家自然科学基金(52178359)
作者简介:汤永净(1965-),女,副教授,主要从事地下结构耐久性及历史建筑结构修复研究,(E-mail) tang@ tongj
Received. 2015-07-30
Foundation item: National Natural Science Foundation of China(No. 52178359)
Author brief: Tang Yongjing (1965-), associate professor, research interests: underground structural durability and
historicalbuildingrehabilitation,(e-mail)yang@tongji.edu.cn.