摘要
为研究“卜”形月牙肋钢岔管的抗震性能,利用大型通用有限元软件建立了某水电站钢岔管三维有限元模型,进行了静力和动力数值计算分析。通过对不同荷载作用下“卜”形岔管应力分布,岔管的动态特性,以及不同动力分析方法对岔管应力影响等计算结果的分析,研究了“卜”形钢岔管的受力特征及抗震性能。研究结果表明;该水电工程的岔管在正常运行时以及地震情况下应力水平较低,具有较大的安全裕度。由于岔管的振动频率较大,地震荷载对岔管的应力影响不大。由于振型分解反应谱法考虑了结构的动态特征,相对于拟静力法计算结果,在岔管肋板和岔管的焊接部位也出现较高的应力。
A three-dimensional finite element model of a steel bifurcated penstock was established to research its seismic performance and stress distribution under earthquake excitation.Quasi-static method and mode-superposition response spectrum method were utilized to analyze the response of steel bifurcated penstock under earthquake load.The stress distribution and amplitude of the steel bifurcated penstock and the outer concrete under different loads were compared.The results show that the stress level is not very high when the steel bifurcated penstock suffers to earthquake.The main reason is that the basic vibrational frequency is higher than the site predominate frequency.The frame bracket of the steel bifurcated penstock is the weakness position under earthquake exciting.This research provides the reference for steel bifurcated penstock aseismic design.
作者
赵飞
范书立
ZHAO Fei;FAN Shuli(National Disaster Reduction Center of China,Beijing 100124,China;School of Hydraulic Engineering,Dalian University of Technology,Dalian,Liaoning 116024,China)
出处
《水利与建筑工程学报》
2020年第3期223-227,共5页
Journal of Water Resources and Architectural Engineering
基金
国家重点研发计划项目“大都市区重大自然灾害损失与社会影响评估技术”(2017YFC1503002)。
关键词
水工结构工程
岔管
地震
三维有限元
hydraulic structure engineering
steel bifurcated penstock
earthquake
3D finite element
