下弦

这下弦的弯月长久地被云层所包围，过了一会，才射出皓光。

The moon in its last quarter , and was long beset with clouds , but after a while , shone out .

在上弦、下弦和望月夜，蠓的活动和月光的变化相关，月光似能促进蠓的活动。

The activities of both the midges are highly related to moonlight at the first quarter , the last quarter and the full-moon .

下弦能够产生雄壮浑厚的音响效果。

The lower strings contribute a splendid richness of sonority .

带托架H型钢屋架厂房结构的实用计算方法以高强钢丝代换预应力砼托架下弦冷拉Ⅳ钢筋的设计与施工

A PRACTICAL CALCULATING METHOD FOR H ROOF BEAM STEEL INDUSTRIAL BUILDINGS WITH THE LATTICE GIRDERS Design and construction of the using hight strength cable to replace cold drawn bar ⅳ in bracket member of prestressed concret

选取了一个带竖杆Warren桁架左边第一个下弦KT型节点，按照桁架中节点各支杆内力比例对所研究节点的支杆施加轴力。

The loading proportion of the branchs is got from the first KT-type joint in the lower chord of a Warren truss from the left side .

深圳市民中心大屋盖为曲面钢网架结构，网架下弦标高在30～50m之间。

The large roof of Shenzhen Citizen Center is a large curved steel grid structure , and the level of lower chords of the grid structure is from 30 meters to 50 meters .

15.9m、20.9m标高处楼层通过高强钢棒吊挂于屋盖钢结构桁架下弦，钢棒为传力关键构件。

The floors of 15.9m and 20.9m hang in the steel roof truss bottom chords through the high-strength steel bars .

屋顶与立面次结构可以有效减小主结构弦杆面外的计算长度，提供ETFE膜结构、下弦声学吊顶与屋面排水系统的支承条件，并形成结构的抗侧力体系。

Roof top and facade secondary structure can effectively reduce the out-of-plane calculated length of the primary chords , and provide support conditions for ETFE cladding structure , acoustic ceiling at the bottom chord and roof drainage system , forming the lateral force resisting system for the structure .

下弦管内预应力梭形空间桁架结构施工分析

The Construction Analysis of Prestressed Bottom Chord Shuttle Shape Spatial Truss

之后，对钢吊车桥架的下弦节点板进行了疲劳强度验算。

Fatigue strength checking computations are carried out for this crane .

大跨度下弦管内预应力空间管桁架结构的试验分析

Experimental Study in the Long Span Bottom Pipe Pre-stressed Truss Structure

下弦为预应力索的协同网架的构想

A Conception of Cooperative Grid with Lower Chord Members Replaced by Prestressed Cables

主楼和裙房间采用大跨鱼腹桁架，桁架下弦采用高强度预应力钢棒。

The bottom chord of the truss is used by pre-stress steel bar .

降低并且停下弦内部分，例如帆船的桅杆。

Lower and bring partially inboard , as of a mast on a sailboat .

双箱梁下弦钢拉杆施工技术研究与应用

Study and Application for Steel Tension Rod of Double Box - beams Rod Structure

大跨屋盖在强风压作用下，会产生向上的风吸力，当风吸力大于屋盖的荷载时，张弦梁结构的上弦就会受拉，下弦受压。

Uuder the stronge wind-stress , a wind suction will happen on the long-span roof .

郑州黄河桥边桁下弦杆制孔工艺研究

Institute on The Hole Drill Technique of Bottom Chord Bar of Zhengzhou Yellow River Bridge

发生在上弦月和下弦月的涨落最小的潮。

A less than average tide occurring at the first and third quarters of the moon .

上、下弦为预应力拉索的索-杆协同网架静力计算与可靠性分析

The Statics Calculation and Applicability Analysis of Cooperative Grids Composed of Prestressed Cables and Pole Members

15米跨梯形钢屋架在下弦荷载作用下的结构试验与性能分析

The papers deal with the structural testing and the property analysis on 15m span trapezoidal steel roof-truss

脉动风荷载作用下弦支穹顶结构的疲劳分析半挂牵引车承受的最大静载荷

FATIGUE ANALYSIS OF SUSPEND-DOME UNDER FLUCTUATING WIND LOAD maximum design static laod borne by semi-trailer towing vehicle

水动力荷载；吊车荷载对梯形钢屋架下弦杆内力的影响

The influence of crane load to the internal force of bottom chord bar of trapezoid steel roof truss

网架支承方式，采用“上、下弦铰支”可显著提高厂房的整体刚度。

The global stiffness of the powerhouse can be improved remarkably by thesupporting with hinged upper and lower chords .

分析了上下弦梁刚度对机车车体结构强度的影响。

I analyzed the stiffness of the upper and lower chord beam affecting the strength of locomotive car-body structure .

钢屋架下弦平台梁疲劳与断裂分析

Analysis of fatigue and fracture on the bottom chords used as a platform beam in a steel roof truss

小潮：出现在每个月上弦或下弦时期，潮差特别小的潮汐。

Neap tides : tides of small range occur when the moon is at its first or last quarter .

广州体育馆屋盖辐射桁架上下弦节点试验与节点设计

Test and design on the joint of upper and down chords of radial truss for the roof of Guangzhou gym

天黑得很快，偏巧这天又是下弦月，月亮不会很快升起。

As the night was fast falling , the moon , being past the full , would not rise early .

以高强钢丝代换预应力砼托架下弦冷拉Ⅳ钢筋的设计与施工

Design and construction of the using hight strength cable to replace cold drawn bar ⅳ in bracket member of prestressed concret

网络拱结构系由上弦拱、下弦杆及交叉倾斜的系杆组成的一种新型结构形式。

Network arch structure is a new type of structure composed of upper chord arch , lower chord members and diagonal members .