1) П-shaped cross section
Π形截面
1.
To study the shear lag effect in cable-stayed bridge with П-shaped cross section,a parametric analysis using finite element analysis was carried out,in which the parameters,such as prestress,transverse slope of bridge deck and little longitudinal beams were considered.
结果表明:预应力对Π形截面斜拉桥主梁轴向应力的横向分布规律有明显影响,计算中不可忽略预应力束的影响;桥面横坡也是影响Π形截面主梁斜拉桥剪力滞效应的一个重要因素,尤其是对顶板中央处的纵向正应力影响较大;在桥面板沿纵向增设小纵梁是减小剪力滞效应的一种有效方法,对于高度较小的纵梁可以显著改善应力分布。
2.
In order to analyze the shear lag effect of cable-stayed bridge with П-shaped cross section girder,the axial stress distribution of test sections of a newly-built cable-stayed bridge with П-shaped cross section girder was tested by the steel string strain sensors,which were embedded in main girder during construction.
为研究Π形截面斜拉桥主梁的剪力效应,通过在一新建Π形截面斜拉桥主梁中预埋钢弦式传感器,全程跟踪实测了主梁各施工阶段以及成桥状态下各测试截面的轴向应力;建立了该桥的三维实体有限元模型,并将计算结果与实测值进行了对比。
2) Π cross-section main girder
Π型截面主梁
1.
A model for a prestressed concrete cable-stayed bridge with a Π cross-section main girder was established in a scale of one to five for a concrete cable-stayed bridge over the Jinsha River in Yibin City.
针对宜宾中坝金沙江斜拉桥,按1∶5的几何尺寸制作了Π型截面主梁预应力混凝土斜拉桥模型,对其剪力滞效应进行了试验研究,并与有限元分析结果进行了比较,两者吻合。
3) Π-shaped cross section
Π形板梁断面
4) cross section shape
截面形状
1.
Effect of cross section shape of interlacer yarn duct on quality of interlaced yarn
网络器丝道截面形状对网络丝质量的影响
2.
The influential factors on cross section shape of PAN fiber were studied during dry-jet-wet spinning.
对干湿法纺丝中PAN纤维的截面形状影响因素进行了研究。
3.
Thus,it is necessary to study the relationship between the welding parameters and weld cross section shape.
通过改变聚焦电流、其余参数不变,能够得到聚焦电流与焊缝截面形状、焊缝横截面面积、熔深、表面熔宽、半熔深处熔宽、余高等焊缝截面几何参量之间的关系,对优化电子束填丝焊接工艺参数具有积极参考意义。
5) irregular section
异形截面
1.
A kind of irregular section carbon fiber and its epoxy composite were involved.
介绍一种异形截面碳纤维,并对其环氧复合材料的力学性能进行研究。
6) section shape
截面形状
1.
Influence of windowpane airproof bar section shape on locomotive airproof performance;
窗玻璃密封条截面形状对机车密封性能影响的探讨
2.
Numerical simulation of the effect of channel section shape on the inner flowing of vortex pump;
流道截面形状对旋涡泵内部流动影响的数值模拟
补充资料：π, π-conjugation
分子式：
CAS号：
性质：单键和双键相互交替排列的共轭体系。最简单的为1,3-丁二烯，而苯分子则是一个具有高度对称结构的闭合共轭体系。除碳碳双键外，碳碳叁键、碳氧双键等，都可组成π,π-共轭。例如：CH2＝CH—C≡CH；CH2＝CH—CH＝O。由π,π-共轭引起的使分子内能降低、键长发生平均化等电子效应，称为π,π-共轭效应。
CAS号：
性质：单键和双键相互交替排列的共轭体系。最简单的为1,3-丁二烯，而苯分子则是一个具有高度对称结构的闭合共轭体系。除碳碳双键外，碳碳叁键、碳氧双键等，都可组成π,π-共轭。例如：CH2＝CH—C≡CH；CH2＝CH—CH＝O。由π,π-共轭引起的使分子内能降低、键长发生平均化等电子效应，称为π,π-共轭效应。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条