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LS-DYNA MODELING OF FOLSOM DAM FOR PIER MODIFICATION DESIGN LOADS

机译：码头修改设计载荷的FOLSOM DAM的LS-DYNA建模

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摘要

In order to obtain loadings and behaviors for existing spillway pier modification designs at Folsom Dam, a 3-D LS-DYNA finite element model was created. The model includes the foundation, abutment sections, and most of the width of the concrete dam. Because loadings were being obtained only at the piers, it was not necessary to model the full extent of the concrete dam and abutments. The model contains nearly 1 million elements and incorporates shell, beam and solid elements. The gates were modeled as curved shell elements with the same radius as the prototype gates. Water was modeled upstream of the gates in each spillway bay (water surface elevation of 466.0). Gate arms, trunnion anchors and sliding trunnion bearing pads were also modeled, to ensure that loadings would travel through the structure as realistically as possible. Brick elements were used to model the bridge decks, piers, monoliths and foundation. Proposed design modifications were included in the model (with the exception of the steel wrap downstream of the trunnion anchors) in order to obtain design loadings as well as to determine the efficacy of the modification designs. The contact between the piers and the surface of the monoliths is a tiebreak surface, to allow more realistic behavior of the anticipated crack along the surface. The tiebreak value was set at 650 lb/in~2, the documented tensile strength of the concrete in Folsom Dam. Crossing the interface below the piers are the modeled passive anchors. The bracing system was included in the model, but was in place primarily to represent the appropriate weight of the braces and not to obtain loads. A very low modulus of elasticity (2.9×10~3 lb/in~2) was assigned to the beam elements. This allowed them to pick up only a very small amount axial load (i.e. in the model all of the cross canyon loading is carried by the bridge deck, although in reality the braces would serve this purpose rather than the bridge deck) while still contributing to the inertia of the piers by their weight. Additionally, relative behavior of the beams can be assessed if necessary. The overall behavior of the model appears to be reasonable under seismic excitation.
机译：为了获得Folsom大坝现有溢洪道闸墩改造设计的荷载和性能，创建了3-D LS-DYNA有限元模型。该模型包括基础，桥台截面以及混凝土坝的大部分宽度。由于仅在码头获得荷载，因此无需对混凝土坝和桥台的整个范围进行建模。该模型包含近一百万个元素，并包含壳，梁和实体元素。闸门被建模为弯曲外壳元素，其半径与原型闸门相同。对每个溢洪道闸门上游的水进行了建模（水面高度为466.0）。还对门臂，耳轴锚和滑动耳轴支座进行了建模，以确保载荷尽可能真实地通过结构。砖块元素被用来对桥面，桥墩，整体和基础进行建模。为了获得设计载荷并确定修改设计的效果，模型中包括了拟议的设计修改（耳轴锚下游的钢制包裹除外）。墩与整料表面之间的接触为平缓决断表面，以使预期裂缝沿表面的行为更加真实。拉断值设定为650 lb / in〜2，这是在Folsom大坝中记录的混凝土抗拉强度。穿过桥墩下方的界面是模型化的被动锚。模型中包含了支撑系统，但主要是为了代表适当的支撑重量而不是为了获得载荷而安装的。分配给梁单元的弹性模量非常低（2.9×10〜3 lb / in〜2）。这样一来，他们只能承受很小的轴向载荷（即，在模型中，所有跨峡谷的载荷都由桥面板承担，尽管实际上，撑杆将用于此目的而不是桥面板），同时仍会码头的惯性由其重量决定。另外，如有必要，可以评估光束的相对行为。在地震激励下，模型的整体行为似乎是合理的。

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  • 来源
  • 会议地点 Sacramento CA(US)
  • 作者

    Anastasia Johnson; Phoebe Percell;

  • 作者单位

    U.S. Bureau of Reclamation, Waterways and Concrete Dams Group (86-68130), Denver Federal Center Bldg 67, 80225;

    rnU.S. Bureau of Reclamation, Structural Analysis Group (86-68110), Denver Federal Center Bldg 67, 80225;

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  • 正文语种 eng
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