Positive vertical temperature gradient in concrete and steel superstructures.

混凝土和钢筋上部结构正垂直温度梯度。

It's not easy to say exactly how superstructures will change, and in what direction.

上层建筑要怎么变，朝什么方向变，不是能简单说清楚的。

It is one of the planet's newest awe-inspiring superstructures - the Hoover Dam Bridge.

这是这颗星球上令人敬畏惊叹的最新超级建筑之一——胡佛大坝桥。

Tunable superstructures were obtained in hydrothermally etched iron-passivated porous silicon (IPS).

采用水热腐蚀技术制备的铁钝化多孔硅表面具有可调超结构。

The superstructures of cable-stayed bridge mainly include three parts:tower, main girder and stay cable.

斜拉桥上部结构包括三个主要部分：索塔、主梁和斜拉索。

Manufacturers of the early 1900s were using steel pipe, angle or channel for the greenhouse superstructures.

二十世纪初期制造商们就已用钢管、角铁以及槽钢之类的材料建造温室的上部结构。

Other applications for fibre composites within ship-building are found in superstructures and secondary structures.

另外，在造船业中纤维增强复合材料也被用于上层建筑和二级结构中。

Due to the atmosphere temperature change, the bridge superstructures' thermal deformation exist impersonality which is a fact.

由于周围大气温度的变化，桥梁上部结构产生的温度变形是一个客观存在的事实。

Recently the collisions between over-high trucks and bridge superstructures have become a serious threaten to the safety of city traffic.

摘要近年，超高车辆撞击桥梁上部结构问题成为城市交通安全的重要威胁。

Abstract: Recently the collisions between over-high trucks and bridge superstructures have become a serious threaten to the safety of city traffic.

摘要：近年，超高车辆撞击桥梁上部结构问题成为城市交通安全的重要威胁。

Then by ignoring the unimportant influencing factors, a simplified model for the collision between over-high trucks and bridge superstructures is developed.

进而通过忽略次要影响因素，对车辆、桥梁受力行为进行合理简化，建立了超高车辆-桥梁上部结构碰撞的简化计算模型。

Study results show that the damage modes of bridge superstructures impacted by over-high trucks include global deformation damage, local damage and girder-falling.

分析结果表明，超高车辆撞击使桥梁上部结构产生整体变形损伤、局部破坏甚至落梁破坏，撞击荷载包括撞击冲量和局部冲击力，不同车型撞击荷载差别较大。

Recently, accidents of collisions between over-high trucks and bridge superstructures happen frequently, which seriously threaten the safety of Bridges and city traffic system.

近年，超高车辆撞击桥梁上部结构的事故频繁发生，严重威胁桥梁结构安全与城市交通运行。

The pair became interested in energy-generating skyscrapers on moving to the United Arab Emirates, where there are superstructures in spades but few that are any greener than their brochures.

这对夫妇来到阿联酋以后开始对供能的摩天大厦产生兴趣，因为那里建筑的上层结构十分出色，但很少能像建筑宣传册上表现得那样环保。