梅山连拱坝抗震加固效果的分析
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摘要
本文对淮河梅山连拱坝9#、10#、11#垛及10#、11#两个全拱和9#、12#两个半拱用有限元数值计算方法,采用无质量弹性地基假定,并采用忽略库水可压缩性的动水压力附加质量的方法来表征库水的影响,计算分析加固前、后坝体动力特性的变化及结构的静动反应,重点考虑垛墙与拱上伸缩缝的影响。基于三维接触模型研究了伸缩缝的张开度及坝体变位情况,并确定坝体的高应力区范围。计算结果表明,加固后坝体在刚度及整体性能方面较加固前有所提高,但参考现行水工建筑物抗震设计规范的相关规定,尽管加固后坝体垛墙与拱上的最大主拉应力分布有所改变,拱与垛墙上局部仍存在拉应力较大的区域,需要采取进一步的加固措施。
Based on the hypothesis of the elastic massless foundation, the FEM is applied to analyze the effectiveness of reinforcement measure for improving the aseismic resistance of the Meishan Multiple Arch Dam, located in Huaihe River. The extra mass method in which the compressibility of water was ignored is adopted to characterize the effect of reservoir water. The dynamic characteristics and the static-dynamic response of the structure, especially the changes of the contraction joints on the buttresses and arches before and after the seismic rehabilitation were simulated using a 3D contact model. The displacements and the high-stress positions of dam body were obtained. The results show that the major stress field of the dam body is improved and the rigidity and integration gets better, but the tensile stress in some parts still exceeds the criteria of the Specifications for Seismic Design of Hydraulic Structures (China). The study on further reinforcement is needed.
Based on the hypothesis of the elastic massless foundation, the FEM is applied to analyze the effectiveness of reinforcement measure for improving the aseismic resistance of the Meishan Multiple Arch Dam, located in Huaihe River. The extra mass method in which the compressibility of water was ignored is adopted to characterize the effect of reservoir water. The dynamic characteristics and the static-dynamic response of the structure, especially the changes of the contraction joints on the buttresses and arches before and after the seismic rehabilitation were simulated using a 3D contact model. The displacements and the high-stress positions of dam body were obtained. The results show that the major stress field of the dam body is improved and the rigidity and integration gets better, but the tensile stress in some parts still exceeds the criteria of the Specifications for Seismic Design of Hydraulic Structures (China). The study on further reinforcement is needed.
引文
[1]潘家铮.连拱坝[M].上海:上海科学技术出版社,1959.
[2]张艳红,胡晓.梅山水库大坝动力分析和抗震安全复核[R].北京:中国水利水电科学研究院,2002.
[3]张艳红,胡晓.梅山水库大坝动力分析和抗震安全复核[R].北京:中国水利水电科学研究院,2008.
[4]张艳红,胡晓.连拱坝地震反应分析[C]//现代地震工程进展.南京:东南大学出版社,2002.
[5]DL5073-2000,水工建筑物抗震设计规范[S].
[6]张艳红,杜修力,张伯艳.考虑介质随机性的结构-地基系统地震反应分析[J].水利学报,2001(1):11~17.
[7]Klaus-Jrgen Bathe.Finite Element Procedures[M].PRENTICE HALL,Englewood Cliffs,NewJersey07632,1996.
[2]张艳红,胡晓.梅山水库大坝动力分析和抗震安全复核[R].北京:中国水利水电科学研究院,2002.
[3]张艳红,胡晓.梅山水库大坝动力分析和抗震安全复核[R].北京:中国水利水电科学研究院,2008.
[4]张艳红,胡晓.连拱坝地震反应分析[C]//现代地震工程进展.南京:东南大学出版社,2002.
[5]DL5073-2000,水工建筑物抗震设计规范[S].
[6]张艳红,杜修力,张伯艳.考虑介质随机性的结构-地基系统地震反应分析[J].水利学报,2001(1):11~17.
[7]Klaus-Jrgen Bathe.Finite Element Procedures[M].PRENTICE HALL,Englewood Cliffs,NewJersey07632,1996.
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