查询词典 natural arch

In this thesis, overlying strata structure combined"voussoir beam"with"half arch"have been put forward for first time, and mechanism and control features of different forms of"half arch"structure and"S—R"stability for the voussoir beam are analysed.

本文在现场实测研究的基础上，采用相似模拟实验、有限元数值模拟和理论分析方法对综放采场上覆岩层的变形和破坏发展过程进行了系统深入的研究。

Continuum topology optimization method for arch axis design of arciform aqueducts;2. The effects of deformation and internal forces produced by transverse bias of arch axis are analyzed by simulative computing.

针对某上承式钢筋砼箱板拱桥建成后的拱轴线与设计拱轴线发生横桥向偏离，通过计算仿真分析探讨拱轴线偏离对主拱内力和变形的影响，提出了几种改善主拱受力状态的措施，为同类拱桥的施工偏差和加固维修提供借鉴。

The Dongping Bridge is a new arcuated built-up system bridges. Half through steel box tied arch and prestressed concrete continuous beam were connected directly, and then the bridge becomes the Cooperation System Bridge with vice-arch.

东平大桥是一种新型的拱梁组合桥，由中承式钢箱系杆拱与预应力混凝土连续梁直接连接形成协作体系，并保留施工过程中的拉杆形成副拱。

Based on the further study of deformation rule of MgO-mixed concrete, the theory of 3-D finite element simulation analysis of MgO-mixed concrete arch dam is discussed in this dissertation combining with the example of YangChun MgO-mixed concrete arch dam. Moreover, the pertinent simulation analysis software is developed by the author and his colleagues. The main contents are as follows.( 1 ) Transformation rules of MgO-mixed concrete are studied. Hyperbola model of MgO-mixed concrete"s autogeny deformation, especially deduce of the model"s parameter and building process of the model are analyzed in detail.

本文结合阳春外掺MgO混凝土拱坝，在深入研究外掺MgO混凝土变形规律的基础上，详细论述了外掺MgO混凝土拱坝三维有限元仿真分析的原理，与相关人员一起研制了有关仿真分析软件，其主要研究内容如下：(1)研究分析了MgO混凝土的变形规律，并重点对MgO混凝土的自生体积变形的双曲线模型，尤其对模型中参数变量的推求及模型的建立过程作了详细分析。

The result indicated that reasonably designing of the cable in the cable-stayed arch bridge can reduce the axile force of the entire arch and obviously reduce the hogging moment and the shearing force the skew back.

分析结果表明：与普通拱桥相比，合理的设计斜拉拱组合桥中斜拉索的参数，能够一定程度地降低整个拱肋的轴力，减小拱脚的负弯矩和剪力。

These data suggest that arotic arch and arch of azygos vein are the key structures to identify the superior aortic recess and lymph nodes. They are essential for understanding the related pathologic changes depicted on CT and MR images.

主动脉弓和奇静脉弓是识别主动脉上隐窝、淋巴结等结构的重要标志，它们在CT和MRI影像学上具有重要的意义。

This is supposed to be a rock arch, not a twisty, branchy, tree arch.

这应该是个石拱门，而不是一个弯来扭去的，全是叶子的树门

The resolute indicates that the entire bridge is reasonable.(2) By establishing another two commeasurable model, the influence of vice-arch and beam-arch cooperation on dead load、live load and tension force of tie-bar was analyzed.

结果表明活载作用下协作体系拱桥边拱拱顶段表现为梁的工作性能，弯矩显著增大；副拱的约束作用能减小结构的变形，弥补拱梁协作对结构受力带来的不利影响。

A linear programming model for the shape optimization of arch dams is established to minimize the maximal t ensile stress of the arch dam.

摘要以最大主拉应力最小作为目标函数，建立了拱坝体型优化设计的线性规划模型。

Vault sedimentations basically happen in buckle arch and phase of excavate of bottom land system, be out of shape with the earth's surface corresponding, if buckle excavate of system of land of arch construction, bottom, steel to prop up timbering,compare seasonable, construction technology is sound, can prevent earthy system effectively to be out of shape flabbily continuously.

拱顶沉降主要发生在扣拱以及下部土体开挖阶段，和地表变形相对应，假如扣拱施工、下部土体开挖、钢支撑支护比较及时，施工工艺合理，可有效防止土体持续松弛变形。

Under strong light intensity at noon, the functional photosystem Ⅱ reaction centers were decreased, which resulted in conspicuous photoinhibition in rice varieties.

进一步系统研究上述品种在孕穗期连体倒二叶片功能叶）的荧光参数的日变化，并解析了它们与耐光氧化和耐荫特性的关系。

As far as free proline content was concerned, that of EI plants was less than EF plants due to higher water-holding ability of EI plants (such as in field plot and field pot sustained drought stress), or due to less damage of membrane of EI plants (such as field pot cyclic drought stress and greenhouse osmotic stress).

至于脯氨酸含量的变化，或是由于感染植株保持体内水分的能力更强（固定样地和田间盆栽持续性干旱胁迫下），或是由于感染植株叶细胞膜结构受到的伤害程度更小（田间盆栽周期性干旱胁迫和温室渗透胁迫下），感染植株的游离脯氨酸含量均低于非感染植株。