非常感谢大舍建筑予gooood分享以下内容。更多关于他们: Atelier Deshaus on gooood。
Appreciation towards Atelier Deshaus for providing the following description:

日晖港人行桥跨越约70m宽的黄浦江支流，将徐汇与黄浦区的公共开放空间连接在一起，在功能上接通浦西沿江公共空间的断点，承担人行交通的功能。桥梁两岸分属不同的区管辖，其场所特征也风格迥异，徐汇区一侧延续西岸公共开放空间的宽阔平坦，犹如广场般的公共尺度，而对岸黄浦区南园则是以园林尺度呈现的公园，地形起伏复杂，道路蜿蜒，桥梁的置入需转换两种空间尺度并恰当的连接不同的标高和流线，与此同时桥梁本身亦不能阻挡河流上的船只通行及岸边的人行通道，功能要求颇为复杂。

Rihui River Footbridge spans 70m of the width of one branch of Huangpu River, lacing the public space of Xuhui District and Huangpu District. It provides the pedestrian route that bridges a gap in the Puxi waterfront. The two ends of the footbridge are taken charge by different districts, with distinct site characteristics. Xuhui side is broad and flat, the scale of which is almost a public plaza; while Huangpu side is more like traditional Chinese garden with all the complex topography and wandering lanes. The footbridge must take into account the two scales on both sides and manage the human flow and connection of different levels properly. Plus, it shall not interfere with the passage of vessels on the river, as well as that of passers-by on the bank.

▼航拍步行桥，bird view

▼远眺步行桥，view from distance

在前期的方案分析阶段，一跨过河，多跨过河及曲折浮桥等常规桥梁模式在应对这样的环境时均会遇到阻挡通行，体量过大或地形改造过多等实际问题，在摸索过程中逐渐发现需要一种更为轻巧灵活的布局模式轻盈而准确地立足于这个复杂的场地，Y形三叉布局应运而生，一方面平面岔开的形式将徐汇区一侧的空间尺度分解为两个小尺度分支与黄浦区南园尺度相衔接，实现空间尺度上的转化，另一方面三落点将一根线性梁转变为三梁拼接，使落点标高的灵活适应成为可能，而任意两桥段形成相互支撑的体系为结构形式的生成提供了可能性。

During the phase of site analysis and initial design, we already realized that conventional bridge designs, like single-span, multi-span and pontoon, have problems under this particular circumstances (blocking the passage, too bulky or too much modifications of topography etc.). We reckoned that a lighter and more flexible layout is needed for the complex site; therefore, we went for a Y-shape proposal. On the one hand, the fork of the footbridge breaks the big scale of Xuhui District into two smaller-scale branches connected to the Huangpu District; on the other hand, the three footings of this proposal convert single beam to three beams that meet together, leaving room for height difference of footings. The system of three bridge segments supporting each other gives a hint to the structural model.

▼建成方案，the bridge

在与日本结构师大野博史以及国内结构师张准逾年的反复推敲和讨论中，我们先后考虑过四种相对合理轻便的方案。单索单撑和单索V撑在结构的视觉表达上呈现效果较好，相对干净利落且有韵律感，但对施工水平和节点设计要求较高。力学合理性弱于单索桁架和大野博史方面提出的三叉索结构。然而，后两个方案也有各自的弱势，一是施工难度较大；二桁架结构略显杂乱缺乏美感，而三叉索又存在影响水上净空的问题。四下相较，考虑到上海地区地基较软，三叉索结构方案因其最小的支座反力（可减小一半），成为建筑师下决心发展的方向。

Over the course of more-than-one-year careful discussions with structural engineers Ohno Hirofumi and Zhang Zhun, we have considered four possible structure systems. Single-rib single-sided bracing and Single-rib V-shape bracing have better visual effects, but they both demand much more for construction quality and detail design. The mechanical performance of these systems are inferior than Single-rib truss bracing and three-way ribs proposed by Ohno. However, the last two systems also have their own weaknesses. For one thing, the difficulties of construction increase. For another thing, the structure of truss lacks aesthetic values while three-way ribs may affect the headroom above water. In light of relatively loose earth condition in Shanghai, the system of three-way ribs is preferred for its almost half-reduced counter-force at the footings.

▼方案分析图，concept

▼方案筛选，programs

在日晖港桥的最终呈现上，由于中途对于支座选址位置的变更，“Y”形岔口出现了细微改变，原先的结构方案无法直接采用，于是有了现在的Y形张弦梁方案。三桥段依据弯矩与受力形成两端小中间大的三角形纵断面，它们在结构概念上相互铰接支撑形成推力结构，这一方面对转化弯矩控制梁高有利，另一方面却必须考虑如何平衡平缓起拱对基础造成的巨大推力，拉索在此承担了重要的作用。常规而言在拉索连接三段脚部形成约束的环箍既能平衡所有推力，但这样做不但影响船舶和行人通行，也使争取来的结构高度失去意义，因此拉索转而拉结各梁的中部即梁高最大的三角形顶角位置，虽在结构上损失部分平衡活载推力的能力，却使桥下通行成为可能，工程上也为拉索锚固创造条件，结构与功能场所取得第一次平衡。

Because the position of the footings slightly changed in the interim design, the original structure cannot be applied directly. Instead, we formulated Y-shape beam string structure system. The bridge segments have triangular sections to resist bending moments according to force analysis. They are hinged together and support each other in thrust. The structure, on the one hand, is beneficial in terms of restricting beam height; on the other hand, the strings play an essential role in lessening and balancing the thrust at the foundations. The strings are usually arranged at the bottom; in this particular case, such treatment will not only block the traffic of people and vessels but also make the reduced beam height meaningless. As a result, the strings connect the middle part of each beam where the section is the deepest. This system may not be the best option to balance the thrust, but it enables the passage underneath the footbridge.

▼依据弯矩与受力形成三角形纵断面，the bridge segments have triangular sections

▼桥下通行， the passage underneath the footbridge

▼台阶，stairs

▼俯瞰步行桥，bird view

而当我们研究桥下空间时，发现笔直的拉索横档在园路上方会对桥下的通行造成阻碍。虽然净高能够满足，却会在心理上给人禁止通行的消极印象，我们认为似乎还缺少一种使之由结构转变为立足于空间和场所中的“桥”的因素，一种让结构真正转化为空间要素的时刻。最后我们决定在拉索中部设置连接桥段交汇处的拉杆，将拉索轻轻上提形成弯折，为桥下尤其是分叉点下的沿河道路争取到符合规范要求和通行舒适度的高度。这一微小的拉拽的动作犹如将拉索掀起，由阻拦变成欢迎的姿态，倾斜的索形与倾斜的桥面也取得了形式上的一致性，在受力形态上，桥梁变得更为整体和富有力度，并且强化了桥梁的结构作为架构对其下方城市空间的覆盖和限定；这一结构上的复杂化使桥转变为空间意义上的结构，结构与空间和场所达成了第二次平衡。结构意图逐渐隐匿，却在空间和场所层面获得了更丰富的意义。

Nevertheless, the straight strings would discourage the human flow under bridge even though the headroom is within acceptable range. We were still looking for a way to really turn the structure into space. At last, we placed a tie rod at the middle point of the string to slightly pull it up, in order to make the whole construction more welcoming. In doing so, the footbridge becomes more integrated and powerful. Intricate in thinking, the structure of the footbridge appears to be effortless. It really converts the architecture into a comfortable urban place above water.

▼将拉索轻轻上提形成弯折，a tie rod at the middle point of the string to slightly pull it up

▼拉锁细节，the tie rod

▼模型图，model

建筑师: 大舍建筑设计事务所
方案设计小组: 柳亦春 / 王伟实 / 大野博史（结构）/ 张准（结构）
深化设计单位:上海市城市建设设计研究总院
建造地点:上海市日晖港与黄浦江交界处
桥梁跨度: 70米
设计时间: 2012.10-2015.12
竣工时间: 2016.9
摄影/视频:田方方
Project name: Footbridge on Rihui River
Architect: Atelier Deshaus
Project team: Liu Yichun, Wang Weishi; Ohno Hirofumi, Zhang Zhun (Structure)
Construction detailing:Shanghai Urban Construction Design and Research
Institute
Location: Intersection of Rihui River and Huangpu River
Design Period: 2012.10-2015.12
Completion: 2016.9
Photography: Tian Fangfang

More: Atelier Deshaus，更多关于他们: Atelier Deshaus on gooood。

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Atelier Deshaus

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