什么是正交异性钢桥面板？
What is an orthotropic steel deck?
正交异性钢桥面板是用纵肋和横肋加劲的薄钢板，既当桥面又当主梁上翼缘，自重轻、承载力高。它广泛用于大跨钢桥，但焊缝疲劳是常见病害。设计需仔细控制细节以抗疲劳。
An orthotropic steel deck is a thin steel plate stiffened by longitudinal and transverse ribs; it serves both as the roadway and the top flange of the girder, so it is light yet strong. It is widely used in long-span steel bridges, but weld fatigue is a common problem. Detailing must be carefully controlled for fatigue resistance.
难度 专业 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Chen 与 Duan 主编,《Bridge Engineering Handbook》,CRC Press,2000
W.-F. Chen and L. Duan eds., Bridge Engineering Handbook, CRC Press, 2000
独立核验依据 · Independent verification: 核验依据 1 ISBN 9780367253318 (2000)
#钢桥 #桥面板 #疲劳
什么是桥梁的颤振？
What is flutter in bridges?
颤振是风作用下桥梁扭转与弯曲振动相互耦合、振幅自我放大的一种发散性失稳。1940年塔科马大桥就因颤振坍塌。现代设计用风洞试验和气动外形来抑制它。
Flutter is a divergent instability in which torsional and bending vibrations of a bridge couple under wind and amplify each other. The 1940 Tacoma Narrows Bridge collapsed due to flutter. Modern designs use wind tunnel tests and aerodynamic shaping to suppress it.
难度 专业 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Chen 与 Duan 主编,《Bridge Engineering Handbook》,CRC Press,2000
W.-F. Chen and L. Duan eds., Bridge Engineering Handbook, CRC Press, 2000
独立核验依据 · Independent verification: 核验依据 1 ISBN 9780367253318 (2000)
#桥梁 #颤振 #风致振动
什么是桥梁健康监测系统？
What is a bridge health monitoring system?
桥梁健康监测系统在桥上布置传感器，长期采集应变、位移、温度和振动等数据。通过模型比对判断结构是否损伤或退化。它帮助养护部门在事故前发现隐患。
A bridge health monitoring system places sensors on the structure to continuously collect strain, displacement, temperature, and vibration data. By comparing with models it judges whether damage or deterioration has occurred. It helps maintenance teams find hazards before accidents happen.
难度 专业 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Chen 与 Duan 主编,《Bridge Engineering Handbook》,CRC Press,2000
W.-F. Chen and L. Duan eds., Bridge Engineering Handbook, CRC Press, 2000
独立核验依据 · Independent verification: 核验依据 1 ISBN 9780367253318 (2000)
#监测 #传感器 #养护
什么是风-车-桥耦合振动？
What is wind-vehicle-bridge coupled vibration?
风-车-桥耦合振动研究强风下行驶车辆、桥梁结构和风三者互相作用引起的振动。它关系到行车安全和舒适，尤其在跨海大桥上突出。分析需用多体动力学与风洞、数值结合的方法。
Wind-vehicle-bridge coupled vibration studies how a moving vehicle, the bridge structure, and wind interact to cause oscillations under strong wind. It affects driving safety and comfort, especially on sea-crossing bridges. Analysis combines multibody dynamics with wind tunnel and numerical methods.
难度 专业 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-04
来源 · Source
Wu, Qiu, Wu, Yao, Guo,《Coupled Vibration Analysis of Ice–Wind–Vehicle–Bridge Interaction System》,Journal of Marine Science and Engineering,2023 (DOI: 10.3390/jmse11030535)
Wu, Qiu, Wu, Yao, Guo, 'Coupled Vibration Analysis of Ice–Wind–Vehicle–Bridge Interaction System', Journal of Marine Science and Engineering, 2023, DOI: 10.3390/jmse11030535
独立核验依据 · Independent verification: 核验依据 1 Crossref DOI 10.3390/jmse11030535
#耦合振动 #风工程 #行车
大跨度桥梁的弯扭颤振失稳是怎样发生的？流线型扁平钢箱梁靠什么手段抬高颤振临界风速？
What mechanism drives bending-torsion flutter instability in long-span bridges, and how does a streamlined flat steel box girder push the critical flutter speed upward?
当气动刚度和气动阻尼随风速增长把竖弯与扭转两个模态耦合成一体，结构从风中净吸收能量时，振幅按指数发散，即发生弯扭颤振。流线型断面借助风嘴推迟气流分离、压低升力矩斜率，中央稳定板又进一步削弱两模态耦合，使颤振临界风速稳定高于设计检验风速。
Flutter erupts when aerodynamic stiffness and damping fuse the vertical-bending and torsional modes so the section draws net energy from the flow and vibration amplitudes diverge exponentially. A streamlined profile uses nose fairings to delay separation and shrink the lift-moment slope, while central stabilizers decouple the two modes further, holding the critical speed above the design checking value.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
R. H. Scanlan、J. Tomko,《Theoretical and Experimental Studies of Bridge Deck Aerodynamic Stability》,Journal of the Engineering Mechanics Division (ASCE),1971年,第97卷第1期
R. H. Scanlan & J. Tomko, Theoretical and Experimental Studies of Bridge Deck Aerodynamic Stability, Journal of the Engineering Mechanics Division, ASCE, 97(1), 1971
#弯扭颤振 #主梁气动外形
大桥怎么知道自己「生病」了?桥梁健康监测系统在听什么?
How does a bridge know it is sick? What do structural health monitoring systems listen for?
大跨桥普遍埋入成百上千个传感器:应变计记录构件受力,加速度计捕捉振动模态——结构的固有频率像指纹,某根拉索松弛或裂缝扩展会让特定频率漂移;位移计与GNSS追踪塔顶摆动,温度计区分真实损伤与热胀冷缩的伪装。数据经边缘计算压缩上传,损伤识别算法比对健康基线发出分级预警。港珠澳大桥与苏通桥都装备了此类系统。挑战在于噪声中分离信号:交通、风、温度都在振动里掺假,统计模式识别与物理模型融合是当前主战场。
Long-span bridges now embed hundreds of sensors: strain gauges log member loads; accelerometers track vibration modes — natural frequencies are fingerprints, and a slackened cable or growing crack drifts them; displacement sensors and GNSS watch tower sway while thermometers unmask fakes from thermal expansion. Edge computing compresses streams, damage-identification algorithms compare against healthy baselines, issuing graded alerts. Hong Kong-Zhuhai-Macao and Sutong both run such systems. The hard part is signal versus noise — traffic, wind and temperature all pollute vibrations, so statistics fused with physics models is the battleground.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Farrar 与 Worden,《Structural Health Monitoring: A Machine Learning Perspective》,Wiley,2013
C. R. Farrar and K. Worden, Structural Health Monitoring: A Machine Learning Perspective, Wiley, 2013
独立核验依据 · Independent verification: 核验依据 1 ISBN 9781118443200 (2012)
#结构健康监测 #固有频率 #损伤识别
什么是悬索桥的垂度？
What is the sag of a suspension bridge?
垂度指悬索桥主缆在塔间自然下垂形成的弧线最低点与塔顶的高度差。垂度越大，主缆水平拉力越小但所需锚碇和塔高增加。设计时要平衡材料用量与受力。
Sag is the vertical drop from the tower tops to the lowest point of the main cable's natural curve between towers on a suspension bridge. Greater sag reduces the cable's horizontal tension but needs larger anchorages and taller towers. Designers balance material use against the forces.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-03
来源 · Source
Hibbeler《结构分析》；AASHTO 桥梁规范；悬索桥工程（Leonhardt）
Hibbeler, Structural Analysis; AASHTO bridge specifications; suspension bridge engineering (Leonhardt)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9781292247137
#悬索桥 #主缆 #垂度
什么是斜拉索的锚固？
What is cable anchorage in a cable-stayed bridge?
斜拉索两端分别锚固在塔柱和桥面梁上，把拉力可靠传递进去。锚固区应力集中，需用特殊构造和高质量混凝土防止开裂。锚具失效会危及整桥安全。
The stay cables are anchored at both ends into the tower and the deck girder to reliably transfer tension. The anchorage zones have stress concentration and need special detailing and high-quality concrete to prevent cracking. Failure of an anchor could endanger the whole bridge.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Chen 与 Duan 主编,《Bridge Engineering Handbook》,CRC Press,2000
W.-F. Chen and L. Duan eds., Bridge Engineering Handbook, CRC Press, 2000
独立核验依据 · Independent verification: 核验依据 1 ISBN 9780367253318 (2000)
#斜拉桥 #锚固 #拉索
什么是可动桥？
What is a movable bridge?
可动桥能在船只通过时开启或旋转，让出航道空间。常见有开启桥、升降桥和旋转桥。它适合河面通航但两岸空间有限的地点。
A movable bridge can open or rotate to let ships pass, giving way to the navigation channel. Common types are bascule, lift, and swing bridges. They suit locations with river traffic but limited space on the banks.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Chen 与 Duan 主编,《Bridge Engineering Handbook》,CRC Press,2000
W.-F. Chen and L. Duan eds., Bridge Engineering Handbook, CRC Press, 2000
独立核验依据 · Independent verification: 核验依据 1 ISBN 9780367253318 (2000)
#桥梁 #可动桥 #通航
什么是拱桥？
What is an arch bridge?
拱桥把荷载通过弯曲的拱圈传递到两端桥台，主要承受压力。拱形能跨越较梁桥更大的跨度且造型优美。石材、混凝土和钢材都能建造拱桥。
An arch bridge transfers loads through a curved arch to the abutments at both ends, mainly under compression. The arch shape can span longer than a beam and looks elegant. Stone, concrete, and steel can all be used to build arches.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Chen 与 Duan 主编,《Bridge Engineering Handbook》,CRC Press,2000
W.-F. Chen and L. Duan eds., Bridge Engineering Handbook, CRC Press, 2000
独立核验依据 · Independent verification: 核验依据 1 ISBN 9780367253318 (2000)
#桥梁 #拱桥 #受压
什么是桥面系？
What is a bridge deck system?
桥面系是桥梁上部直接承受车辆和行人荷载的部分，包括桥面板、铺装层和排水设施。它把荷载传给主梁并保障行车舒适与安全。桥面铺装还要耐磨、防水、抗冻。
The deck system is the upper part of a bridge that directly carries vehicles and pedestrians, including the deck slab, surfacing, and drainage. It transfers loads to the main girders and ensures comfortable, safe riding. The surfacing must also resist wear, water, and freezing.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Chen 与 Duan 主编,《Bridge Engineering Handbook》,CRC Press,2000
W.-F. Chen and L. Duan eds., Bridge Engineering Handbook, CRC Press, 2000
独立核验依据 · Independent verification: 核验依据 1 ISBN 9780367253318 (2000)
#桥梁 #桥面 #铺装
大跨度桥梁的涡激振动为什么多发生在较低风速下,而且振幅不会无限发散?
Why does vortex-induced vibration of long-span bridges appear at fairly low wind speeds yet never diverge without bound?
气流绕过主梁断面按斯特劳哈尔数确定的频率周期性脱涡,当脱落频率逼近某阶固有频率时发生锁定,结构进入共振状态。锁定区内负气动阻尼有限,振幅收敛于一个上限值而非像颤振那样发散,工程上常用调谐质量阻尼器、导流板或优化主梁断面外形加以抑制。
Flow past the deck sheds vortices periodically at a frequency fixed by the Strouhal number, and once shedding approaches a natural frequency the response locks in and the structure resonates. Within the lock-in range the negative aerodynamic damping is bounded, so amplitudes settle at a finite limit instead of growing as in flutter; engineers curb the effect with tuned mass dampers, fairings or reshaped deck cross-sections.
难度 进阶 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：作者 / 书名 / 版次 / 出版社 / 年份齐备，仅缺独立比对证据；已在可信度报告单列披露，不再重复核验。
E. Simiu & R. Scanlan《风对结构的作用：基础与应用》第2版,Wiley,1999
E. Simiu & R. H. Scanlan, Wind Effects on Structures: Fundamentals and Applications, 2nd ed., Wiley, 1999
#涡激振动 #锁定现象
悬索桥和斜拉桥都是「绳子拉着桥面」,受力方式有什么本质不同?
Suspension and cable-stayed bridges both hang decks from cables — how does the load path truly differ?
悬索桥的主缆是抛物线,锚死两岸,吊杆竖直向下只承担「提」的力,桥面荷载经由主缆传入巨大的锚碇,塔主要承受竖向压力;刚度靠桥面自身桁架提供,所以适合千米以上超大跨度,但整体较柔。斜拉索则从塔顶直连桥面,呈扇形直线张拉,每根索既是吊点又是弹性支座,给桥面多点弹簧约束,梁以压弯为主、塔还要平衡两侧水平分力。简单说:一个靠「兜住再传走」,一个靠「多点直接拎起」,决定了各自的适用跨度与造型语言。
A suspension bridge's main cable drapes in a parabola anchored at both banks; vertical hangers merely lift, sending loads through the cable into massive anchorages while towers take compression — stiffness comes from the stiffening truss, suiting spans beyond a kilometer but staying flexible. Cable-stayed fanning runs taut straight lines from tower top to deck: each stay is simultaneously hanger and elastic spring support, putting the girder in compression-bending and forcing towers to balance horizontal components. One cradles and conveys away; the other lifts directly at many points — hence their different span sweet spots and silhouettes.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Chen 与 Duan 主编,《Bridge Engineering Handbook》,CRC Press,2000
W.-F. Chen and L. Duan eds., Bridge Engineering Handbook, CRC Press, 2000
独立核验依据 · Independent verification: 核验依据 1 ISBN 9780367253318 (2000)
#悬索桥 #斜拉桥 #传力路径
海底隧道是怎么在海底下挖出来的?水不会漏进来吗?
How do builders dig tunnels under the sea without water leaking in?
两种办法:沉管法在陆地造好巨大混凝土管,两端封门后拖到海上沉入挖好的沟槽,对接密封像海底拼乐高;盾构法用巨型盾构机像穿山甲一样边挖边砌圈。衬砌层层防水,加上排水泵站,海水被牢牢挡在外面。港珠澳大桥的海底隧道就是33节沉管接成的。
Two ways: immersed tubes — giant concrete segments sealed at ends, floated out, sunk into a dredged trench and joined like undersea Lego; or boring machines digging like pangolins while lining walls behind. Waterproof linings plus pump stations keep sea water locked out. The Hong Kong-Zhuhai-Macao tunnel joins thirty-three such tubes.
难度 进阶 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 2 条独立证据
来源 · Source
《十万个为什么》第六版建筑与交通分册,少年儿童出版社,2013
Ten Thousand Whys: Architecture and Transportation volume, 6th ed., Juvenile and Children Publishing House, 2013
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-7-5324-9328-9 · 核验依据 2 ISBN 9787532493289
#海底隧道 #沉管法 #盾构机
什么是梁桥？
What is a beam bridge?
梁桥是最简单的桥型，由平直的梁横跨在两岸桥墩上承受荷载。车辆重量通过梁传到桥墩再进入地基。它适用于中小跨度，施工简单、造价低。
A beam bridge is the simplest type, with a straight beam spanning between piers or abutments to carry loads. The weight of traffic passes through the beam to the piers and then into the ground. It suits small to medium spans and is cheap and simple to build.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Chen 与 Duan 主编,《Bridge Engineering Handbook》,CRC Press,2000
W.-F. Chen and L. Duan eds., Bridge Engineering Handbook, CRC Press, 2000
独立核验依据 · Independent verification: 核验依据 1 ISBN 9780367253318 (2000)
#桥梁 #梁桥 #桥墩
什么是赵州桥？
What is the Zhaozhou Bridge?
赵州桥是中国隋朝李春建造的石拱桥，距今约1400年，是世界上现存最古老的敞肩石拱桥。它在主拱两侧开小拱以减轻重量并泄洪。其结构至今仍基本完好。
The Zhaozhou Bridge is a stone arch bridge built by Li Chun in China's Sui dynasty about 1,400 years ago, and is the world's oldest surviving open-spandrel stone arch bridge. Small side arches lighten the weight and help discharge floodwater. Its structure remains largely intact today.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Lehner《完整的金字塔》；Jackson 等《PNAS》2013（罗马混凝土）；中国《赵州桥志》
Lehner, The Complete Pyramids; Jackson et al., PNAS (2013, Roman concrete); Zhaozhou Bridge Records
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL2757039W：The Complete Pyramids（首
#古桥 #拱桥 #赵州桥
什么是斜拉桥？
What is a cable-stayed bridge?
斜拉桥用一排斜拉的钢索把桥面直接拉在塔柱上，钢索像扇骨一样展开。它比悬索桥更适合中等到大跨度。钢索承受拉力，塔柱受压，整体刚度较好。
A cable-stayed bridge uses a fan of steel cables running directly from towers to the deck to hold it up. It fits medium to long spans better than many other types. The cables carry tension while the towers take compression, giving the bridge good stiffness.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Chen 与 Duan 主编,《Bridge Engineering Handbook》,CRC Press,2000
W.-F. Chen and L. Duan eds., Bridge Engineering Handbook, CRC Press, 2000
独立核验依据 · Independent verification: 核验依据 1 ISBN 9780367253318 (2000)
#桥梁 #斜拉桥 #拉索
塔科马海峡大桥通车四个月就被风吹塌了?风到底对桥做了什么?
The Tacoma Narrows Bridge collapsed four months after opening — what was the wind doing to it?
1940年11月7日,这座主跨仅268米、断面纤细的悬索桥在约19米每秒的风中扭转失稳,路面像拧麻绳般翻滚直至断裂。罪魁不是风的推力本身,而是气动自激颤振:H形断面抗扭刚度低,风引起的扭转又反过来改变桥面受到的气动力,形成正反馈,能量持续注入使振幅指数增长——这是扭转颤振,而非简单的涡激共振。事故催生了风洞试验制度与流线型断面设计,此后大跨度桥梁都必须先证明自己不会重演这场灾难。
On 7 November 1940 the slender suspension bridge, with a mere 268-metre main span, went torsionally unstable in roughly 19 m/s winds, the deck wringing itself apart like a rope. The culprit was not steady push but aerodynamic self-excitation: the shallow H-shaped section had little torsional stiffness, and wind-driven twist in turn reshaped the aerodynamic forces acting on the deck — positive feedback injecting energy until amplitudes grew exponentially. This is torsional flutter, not plain vortex resonance. The disaster made wind-tunnel verification routine and pushed streamlined deck design; every long-span bridge must now prove it will not repeat the dance.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Billington,《The Tower and the Bridge》,Basic Books,1983
D. P. Billington, The Tower and the Bridge, Basic Books, 1983
独立核验依据 · Independent verification: 核验依据 1 ISBN 9780691236933 (1983)
#桥梁风工程 #颤振 #塔科马