| 朱伯芳.有限厚度带键槽接缝单元及接缝对混凝土坝应力的影响[J].水利学报,2001,32(2):0001-0008 |
| 有限厚度带键槽接缝单元及接缝对混凝土坝应力的影响 |
| Joint element with keys and the influence of joint on stresses in concrete dams |
| |
| DOI： |
| 中文关键词: 混凝土坝 接缝单元 键槽 初始间隙 灌浆质量 横缝不抗拉 |
| 英文关键词: concrete dam joint element initial clearance transverse joints |
| 基金项目: |
|
| 摘要点击次数: 2315 |
| 全文下载次数: 152 |
| 中文摘要: |
| 本文给出了有限厚度的带键槽三维实体接缝单元，它可以较好地反映接缝附近的应力和接触条件。文中分析了接缝的初始间隙问题，分析结果表明，经过灌浆以后，由于浆体收缩而产生的初始间隙是很小的，一般可以忽略。文中还分析了灌浆质量对坝体应力的影响，分析结果表明，只要浆体灌进了接缝，虽然浆体质量差一些，带有键槽的接缝对坝体应力和变形的影响是很小的。本文最后分析了横缝不抗拉对拱坝应力的影响，分析结果表明，这个问题与横缝受拉深度a和横缝间距L的比值a/L有关，a/L越大，横缝不抗拉对坝体应力的影响越大，此外，还与坝体厚度及气候条件有关。 |
| 英文摘要: |
| A 3-D isoparametric joint element with keys of finite thickness in concrete dams for simulation calculation is introduced. It is pointed out that the magnitude of the initial clearance of joints due to shrinkage of grout is very small which can be neglected. Joints with keys can resist compression and shear but cannot resist tension. Since the horizontal stress in arch dam may be tensile or compressive the transverse joints, which can not resist tensile stress, will influence the distribution of stress in an arch dam. It is explained how this problem is related to the following factors:(1)depth of tensile stress region; (2)ratio of depth of tensile stress to spacing of transverse joints; (3)thickness of the dam and (4) climate condition at dam site. In cold region, the upper part of a thin arch dam may subject to tensile stress in full cross section during winter. In this case, the influence of transverse joints on the stress distribution in the dam is remarkable. On the contrary, the depth of tensile stress region is small for a thick arch dam in mild region, in this case the influence of transverse joints is little. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |