考虑装配块接缝影响的装配式混凝土坝结构分析
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摘要
装配式混凝土坝的装配块间存在接缝,在结构分析时是必须要考虑到的问题。采用Lagrange乘子法、罚函数非线性接触算法与ANSYS接触单元,针对结构接缝缝间规律,模拟了张开、滑移和接触挤压三种实际接触状况。结果表明:接缝接触面张开行为对结构影响很大,但是接触面滑移与接触应力对结构却影响较小;水平缝比竖直缝有更大的安全隐患。准确的结构计算为设计提供可靠依据。
The joint seam between the precast blocks must be considered in the structural analysis of the prefabricated concrete dam. The actual contact conditions, i.e. opening, slipping, contact extrusion, are simulated herein with Lagrange multiplier method, penalty function nonlinear contact algorithm and ANSYS contact element for the law among the seams of the structural joint. The result shows that the opening behavior of the contact-plane has a great impact on the structure, but the slipping of the contact-plane and the contact stress have less impacts on the structure, while the horizontal joint-seam has a larger potential safety hazard than that of the vertical one.Therefore, accurate structural calculation can provide a reliable basis for the design concerned.
The joint seam between the precast blocks must be considered in the structural analysis of the prefabricated concrete dam. The actual contact conditions, i.e. opening, slipping, contact extrusion, are simulated herein with Lagrange multiplier method, penalty function nonlinear contact algorithm and ANSYS contact element for the law among the seams of the structural joint. The result shows that the opening behavior of the contact-plane has a great impact on the structure, but the slipping of the contact-plane and the contact stress have less impacts on the structure, while the horizontal joint-seam has a larger potential safety hazard than that of the vertical one.Therefore, accurate structural calculation can provide a reliable basis for the design concerned.
引文
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[2] KARTAL M E,BAYRAKTAR A,BA.Nonlinear finite element reliability analysis of Concrete-Faced Rockfill (CFR) dams under static effects[J].Applied Mathematical Modelling,2012,36(11):5229- 5248.
[3] BAYRAKTAR A,SEVIM B,ALTUNI?IK A C.Finite element model updating effects on nonlinear seismic response of arch dam-reservoir-foundation systems[J].Finite Elements in Analysis & Design,2011,47(2):85- 97.
[4] 吴松樵,王国荣.预制安装筑坝的初步经验[J].人民长江,1965,1(1):18- 20.
[5] SULEIMANOV I A G,KIM V E.Method of analysis of prefabricated concrete dam[J].Hydrotechnical Construction,1992,26(4):220- 226.
[6] 刘川顺,朱以文.小型装配式混凝土重力坝的结构体系和结构分析[J].武汉水利电力大学学报,1996,29(5):26- 29.
[7] RAHMAN M U,et al.An iterative procedure for finite-element stress analysis of frictional contact problems[J].Comput Struct,1984(18):947- 954.
[8] 张冬霁.接触面薄层单元的研究及其应用[D].南京:河海大学,1997.
[9] 韩青,张毅刚,赵凯红.结构工程中接触问题的数值计算方法[J].北京工业大学学报,2006,32(4):321- 326.
[10] 郑宏,葛修润,岳中琦,等.界面问题的混合有限元法[J].岩石力学与工程学报,2002,21(1):1- 8.
[11] 陶磊,张俊发,刘云贺.最大可信地震下重力坝三维非线性灾变分析[J].水力发电学报,2014,33(1):132- 138.
[12] 何婷,汪卫明,张雄,等.复合接触单元及其在带缝高拱坝仿真中的应用[J].水力发电学报,2012,31(5):216- 222.
[13] 李同春,樊舒婕,刘晓青,等.非连续变形接触问题的分区有限元-块体界面元动力混合算法[J].水电与抽水蓄能,2018,4(2):37- 41.
[14] 苏超,赵业彬.水工结构接触问题的多体有限元法[J].岩土工程学报,2016,38(6):1051- 1056.
[15] WANG Z,GAO L,SONG W.Finite element analysis of 3-D friction-contact problems[J].Journal of Tsinghua University,2002,42:93- 96.
[16] 王新敏,李义强,许宏伟.ANSYS结构分析单元与应用[M].北京:人民交通出版社,2011.
[17] 赵兰浩.考虑坝体-库水-地基相互作用的有横缝拱坝地震响应分析[D].南京:河海大学,2006.
[18] CARPINTERI A,VALENTE S,FERRARA G,et al.Experimental and numerical fracture modelling of a gravity dam[J].Special Publication,1994,143:107- 122.