强震区高拱坝的两种抗震措施效果研究
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摘要
为研究拱坝在坝体上部跨横缝配筋和设置阻尼器两种抗震措施效果,以大岗山拱坝为例,基于在有限元软件ABAQUS平台上二次开发的有限元模型分析,采用限制缝面切向滑移的接触单元模型模拟切向完全约束的高拱坝横缝在地震动荷载作用下张开、闭合的非线性力学行为,并采用点点接触的弹簧单元模型表示横缝插筋的作用,应用ABAQUS中的阻尼器模型考虑设置阻尼器的作用。计算结果表明,两种措施均可控制强震区高拱坝在强震作用下横缝开度,但设置粘滞阻尼器后抗震作用不明显。
Two kinds of aseismic measures,collocating steel bars across the transverse joints and installing dampers at transverse joints on the upper of arch dam,are studied based on the finite element model of arch dam developed by the ABAQUS software.The type of contact elements which limit the joint surface slip in the tangential direction are used to simulate the nonlinear mechanical behaviors,i.e.open and close,of the transverse joints constrained fully in tangential direction under dynamic load response.The point to point contact spring element is applied to express the steel bar across transverse joints.A damper model is used to simulate the damper located in the transverse joints.Two kinds of the seismic reinforcements have been proposed to reduce the maximum dynamic openings of transverse joints.However,the seismic effect of the damper located in the transverse joints is insignificant.
Two kinds of aseismic measures,collocating steel bars across the transverse joints and installing dampers at transverse joints on the upper of arch dam,are studied based on the finite element model of arch dam developed by the ABAQUS software.The type of contact elements which limit the joint surface slip in the tangential direction are used to simulate the nonlinear mechanical behaviors,i.e.open and close,of the transverse joints constrained fully in tangential direction under dynamic load response.The point to point contact spring element is applied to express the steel bar across transverse joints.A damper model is used to simulate the damper located in the transverse joints.Two kinds of the seismic reinforcements have been proposed to reduce the maximum dynamic openings of transverse joints.However,the seismic effect of the damper located in the transverse joints is insignificant.
引文
[1]陈观福,徐艳杰,张楚汉.强震区高拱坝横缝配筋抗震措施[J].清华大学学报(自然科学版),2003,43(2):266-269.
[2]王品江,王进廷,周元德,等.强震区高拱坝抗震措施比较[J].水利水电科技进展,2006,26(4):15-17,20.
[3]罗秉艳,徐艳杰,王光纶.大岗山拱坝考虑阻尼器抗震措施的非线性动力反应分析[J].水力发电学报,2007(1):67-70.
[4]姜淑梅,王丹,金峤,等.高混凝土重力坝抗震配筋效果的模型试验研究[J].水电能源科学,2009,27(4):97-99,83.
[5]孙万泉,吕爱钟.高拱坝横缝间布设SMA耗能棒材的减震分析与研究[J].水力发电学报,2011,30(2):96-99,106.
[6]徐艳杰,张楚汉,王光纶,等.小湾拱坝模拟实际横缝间距的非线性地震反应分析[J].水利学报,2001(4):68-74.
[7]中国水利水电科学研究院,电力工业部昆明勘测设计研究院,电力工业部西部勘测设计研究院,等.水工建筑物抗震设计规范(DL5073-2000)[S].北京:中国电力出版社,2001.
[2]王品江,王进廷,周元德,等.强震区高拱坝抗震措施比较[J].水利水电科技进展,2006,26(4):15-17,20.
[3]罗秉艳,徐艳杰,王光纶.大岗山拱坝考虑阻尼器抗震措施的非线性动力反应分析[J].水力发电学报,2007(1):67-70.
[4]姜淑梅,王丹,金峤,等.高混凝土重力坝抗震配筋效果的模型试验研究[J].水电能源科学,2009,27(4):97-99,83.
[5]孙万泉,吕爱钟.高拱坝横缝间布设SMA耗能棒材的减震分析与研究[J].水力发电学报,2011,30(2):96-99,106.
[6]徐艳杰,张楚汉,王光纶,等.小湾拱坝模拟实际横缝间距的非线性地震反应分析[J].水利学报,2001(4):68-74.
[7]中国水利水电科学研究院,电力工业部昆明勘测设计研究院,电力工业部西部勘测设计研究院,等.水工建筑物抗震设计规范(DL5073-2000)[S].北京:中国电力出版社,2001.
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