free field stress 中文意思是什麼
free field stress
解釋
自由場應力-
With an analysis of soil liquefaction potential for free field of nanjing metro line 1 under 7 degree earthquake, as well as for excavated field, in line with railway engineering anti - earthquake design specification, dynamic triaxial tests and theoretical analysis using efficient stress method, the author comes to the conclusion that, when metro plate is located at layer s and the layer is thick, liquefied area is at metro bottom plate ; in some local section liquefied area is at metro top plate, or arch sides at the top of metro in most places
摘要採用鐵路工程抗震設計規范、動三軸試驗及有效應力的理論分析相結合的方法，對南京地鐵南北線（ 1號線）區間隧道開挖后其地基土在7度地震情況下的土層液化情況進行分析得出：當隧道底板坐落在5層且5層較厚時的液化區出現在隧道襯砌底板處；局部地段液化區出現在隧道頂部及拱腰；大部分地段的液化區出現在隧道頂板上方。 -
The main results and academic contributions of the dissertation can be summarized as following : 1 ) for the difficulty to obtain the accurate analytical solution of the stress constraints around 3d cracks, detailed 3d fe analyses have been conducted to study the out - of - plane constraint factor tz around a straight through - thickness crack, a quarter - elliptical corner crack and a semi - elliptical crack embedded in an isotropic elastic plate subjected to uniform remote tension loading. the distributions of tz are minutely studied in the forward section of the cracks. strong 3d zones ( tz > 0 ) along the crack front were investigated despite the far field stress - free boundary conditions
全文主要研究內容和學術貢獻如下: 1 .針對一般三維裂紋端部場應力約束準確解析的困難，對均勻拉伸載荷作用下各向同性彈性板中穿透厚度中心直裂紋、半橢圓表面裂紋和1 / 4橢圓角裂紋進行了大量詳細的全場應力三維有限元分析，首次全面分析了非穿透裂紋端部場三維影響區范圍，給出了不同形狀三維裂紋前沿離面應力約束因子tz的數值解，並結合k場平面解給出了非穿透裂紋端部應力場k - tz雙參數描述。 -
The expressions can take into account some important aspects such as stress - free ground surface, incompression of soil, prebored hole and tubular pile. through the analysis of displacement field, the variation rules of horizontal and vertical displacements are obtained
由位移場的解析解分析可知，樁身整個深度內的水平向位移場是向外擠出，豎向位移場在表層土體表現為隆起，而深層土體表現為下沉。 -
Abstract : in this paper, the stress field in a concave plank being upset is resolved by analytic mathematical method of plastic mechanics, the relation between the geometric parameter ( dimension ratio, concave shape ) and friction shearing stress is determined for upsetting a plank free of tension stress
文摘:本文用塑性力學初等解析法求解了凹形板坯鐓粗時的應力場，確定了無拉應力鐓粗時坯料幾何參數（尺寸比、凹形形狀）與坯料端面摩擦剪應力的關系。 -
By use of the stress free conditions on crack and the continuity conditions of stress and displacement on ideal bonded material interface, the stress field of an bi - material infinite plate with an elliptical inclusion and a deminfinite interface crack are given on the base of the complex potentials solutions obtained above. and the corresponding stress intensity factor k is given
在該復勢解的基礎上，根據裂紋表面的零應力條件和理想粘接界面上的位移和應力連續條件，通過求解hilbert問題，得到了含有夾雜和半無限界面裂紋的無限大板的應力場，並由此給出了裂尖的應力強度因子k 。 -
Compared with free field, the peak acceleration decreases and the peak shear stress increases under the overload transmitted from superstructures either inside or outside improved area. at the same replacement ratio, the peak acceleration and the peak shear stress both increase with the increment of layers in superstructures
在上部建築結構中，復合地基置換率相同時，隨著層數增加，結構中的加速度和剪應力峰值都隨之增大;而置換率增大時，結構中的加速度和剪應力峰值也增大。
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