To study the influence of construction interfaces on dynamic characteristics of roller compacted concrete dams(RCCDs),mechanical properties of construction interfaces are firstly analyzed. Then, the viscous-spring art...To study the influence of construction interfaces on dynamic characteristics of roller compacted concrete dams(RCCDs),mechanical properties of construction interfaces are firstly analyzed. Then, the viscous-spring artificial boundary(VSAB) is adopted to simulate the radiation damping of their infinite foundations, and based on the Marc software, a simplified seismic motion input method is presented by the equivalent nodal loads. Finally, based on the practical engineering of a RCC gravity dam, effects of radiation damping and construction interfaces on the dynamic characteristics of dams are investigated in detail. Analysis results show that dynamic response of the RCC gravity dam significantly reduces about 25% when the radiation damping of infinite foundation is considered. Hot interfaces and the normal cold interfaces have little influence on the dynamic response of the RCC gravity dam.However, nonlinear fracture along the cold interfaces at the dam heel will occur under the designed earthquake if the cold interfaces are combined poorly. Therefore, to avoid the fractures along the construction interfaces under the potential super earthquakes,combination quality of the RCC layers should be significantly ensured.展开更多
传统有限元法对大坝-不规则地基-库水系统进行建模时存在一定的局限性。基于ABAQUS二次开发接口,实现了比例边界有限元方法(scaled boundary finite element method,SBFEM)与八叉树网格的结合,建立了一种考虑真实地形的高拱坝-不规则地...传统有限元法对大坝-不规则地基-库水系统进行建模时存在一定的局限性。基于ABAQUS二次开发接口,实现了比例边界有限元方法(scaled boundary finite element method,SBFEM)与八叉树网格的结合,建立了一种考虑真实地形的高拱坝-不规则地基-库水系统自动建模方法。利用构建的八叉树比例边界有限元法对某重力坝地震响应进行了数值验证。随后对NG5拱坝系统分别基于平整地基和不规则地基进行线弹性和非线性动力响应分析。结果表明:在地震作用下,相较于简化的平整地基拱坝系统,不规则地基拱坝系统坝顶与坝底横河向相对位移以及第一主应力峰值变化较大,分别增加了73.5%和103.6%;考虑拱坝横缝以及材料非线性的情况下,坝顶与坝底横河向相对位移以及顺河向相对位移和相对速度分别增加了43.9%、32.0%和56.6%,同时边缝的法向开度增加尤为显著,增加了388.9%和381.8%,开度峰值增加了105%,在应力和损伤方面,第一主应力峰值增加了81.6%,损伤较大的区域也沿着坝体底部进行了扩展。展开更多
基金Projects(20120094110005,20120094130003)supported by the Research Fund for the Doctoral Program of Higher Education of ChinaProjects(51379068,51139001,51279052,51209077,51179066)supported by the National Natural Science Foundation of China+1 种基金Project(NCET-11-0628)supported by the Program for New Century Excellent Talents in University,ChinaProjects(201201038,201101013)supported by the Public Welfare Industry Research Special Fund Project of Ministry of Water Resources of China
文摘To study the influence of construction interfaces on dynamic characteristics of roller compacted concrete dams(RCCDs),mechanical properties of construction interfaces are firstly analyzed. Then, the viscous-spring artificial boundary(VSAB) is adopted to simulate the radiation damping of their infinite foundations, and based on the Marc software, a simplified seismic motion input method is presented by the equivalent nodal loads. Finally, based on the practical engineering of a RCC gravity dam, effects of radiation damping and construction interfaces on the dynamic characteristics of dams are investigated in detail. Analysis results show that dynamic response of the RCC gravity dam significantly reduces about 25% when the radiation damping of infinite foundation is considered. Hot interfaces and the normal cold interfaces have little influence on the dynamic response of the RCC gravity dam.However, nonlinear fracture along the cold interfaces at the dam heel will occur under the designed earthquake if the cold interfaces are combined poorly. Therefore, to avoid the fractures along the construction interfaces under the potential super earthquakes,combination quality of the RCC layers should be significantly ensured.
文摘传统有限元法对大坝-不规则地基-库水系统进行建模时存在一定的局限性。基于ABAQUS二次开发接口,实现了比例边界有限元方法(scaled boundary finite element method,SBFEM)与八叉树网格的结合,建立了一种考虑真实地形的高拱坝-不规则地基-库水系统自动建模方法。利用构建的八叉树比例边界有限元法对某重力坝地震响应进行了数值验证。随后对NG5拱坝系统分别基于平整地基和不规则地基进行线弹性和非线性动力响应分析。结果表明:在地震作用下,相较于简化的平整地基拱坝系统,不规则地基拱坝系统坝顶与坝底横河向相对位移以及第一主应力峰值变化较大,分别增加了73.5%和103.6%;考虑拱坝横缝以及材料非线性的情况下,坝顶与坝底横河向相对位移以及顺河向相对位移和相对速度分别增加了43.9%、32.0%和56.6%,同时边缝的法向开度增加尤为显著,增加了388.9%和381.8%,开度峰值增加了105%,在应力和损伤方面,第一主应力峰值增加了81.6%,损伤较大的区域也沿着坝体底部进行了扩展。
