青龙RCC拱坝封拱温度对拉应力的影响  

Influences of Joint Closure Temperature for Qinglong RCC Arch Dam on Tensile Stress

作　　者：查龙青 王均星[1] 杨舒涵[1] 周招 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072

出　　处：《水电能源科学》2016年第3期80-83,共4页Water Resources and Power

摘　　要：青龙RCC拱坝在施工过程中多次调整封拱温度,针对不同的封拱温度方案,利用ANSYS有限元软件计算了温降工况下坝体的应力,并编写APDL程序导出了各方案下上、下游面两拱端及拱冠的等效应力,分析了拉应力的分布规律。结果表明,不同封拱温度方案下青龙拱坝坝体拉应力分布差距较大,当局部高程坝体的实际封拱温度高于设计值时,坝体的拉应力分布范围较设计工况有所扩大,应力值增大;在高温季节施工时,若不采取温控措施,坝体会产生过高的拉应力而影响安全。The joint closure temperature of Qinglong RCC arch dam was constantly adjusted during the process of its construction.The dam stress in the condition of temperature drop was calculated by using the ANSYS software for different joint closure temperature programs.The paper wrote the APDL program to figure out the equivalent stress of arch abutment and crown on the upstream face and the downstream face under each program.And the rule of tensile stress distribution was analyzed.The results show that the distribution of the tensile stress in the dam was different under different joint closure temperature programs.When actual joint closure temperature was higher than the design value on local elevation of dam body,the range of tensile stress distribution and its value were larger than the design conditions.If the temperature measures were not taken in the season of high temperature,the large tensile stress would be produced to impact the safety of the dam.

关 键 词：RCC拱坝 封拱温度 等效应力 拉应力 

分 类 号：TV642.4[水利工程—水利水电工程] TV31