摘要
通过对6种新型墙体材料和烧结普通砖在不同冻融循环次数(0,25,50和75次)下的试验,研究新型墙体材料的质量损失率、强度损失率与循环次数的关系,结合新型墙体材料冻融损伤失效过程,建立新型墙体材料的冻融损伤时变可靠度计算模型。研究结果表明:以混凝土实心砖为例,随着时间的推移,混凝土实心砖的冻融循环时变可靠指标逐渐变小,变化趋势呈抛物线型。通过模型可预测新型墙体材料的冻融循环寿命,为新型墙体材料的冻融损伤计算提供依据,为维护部门提供决策依据,降低失效风险。
Freeze-thaw tests were made for six kinds of the new wall materials and clay brick,and the number of freeze-thaw cycles is 0,25,50 and 75.By studying relationship of rate of mass loss and cycle numbers or rate of strength loss and cycle numbers,calculating damaging model of new-type walling materials was found based on time-depending reliability under action of freeze-thaw cycle.The result shows that time-depending reliability index of concrete solid brick in freeze-thaw cycles is gradually changing smaller,with time going by,and changing tendency is parabola.Using the model,the freeze-thaw cycle life of the new type wall materials can be predicted,which supplies basis of freeze-thaw damaging calculation for the new-type wall materials,and reduces risk.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第11期3342-3346,共5页
Journal of Central South University:Science and Technology
基金
国家"十一五"科技支撑计划重点项目(2009BAK58B03)
住房和城乡建设部2009科技计划攻关项目(2009-K1-16
2009-R1-3)
沈阳建筑大学省级重点实验室2009年度开放基金资助项目(CL-200903)
辽宁省2010年科学计划项目(2010401031)
沈阳市人才资源开发专项资金资助项目(2009040403020)
沈阳市科学技术计划项目(F10-177-8-00)
关键词
新型墙体材料
冻融循环
寿命
时变可靠性
new-type walling materials
freeze-thaw cycle
life
time-depending reliability
