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| Re:上海青浦步行桥，历时四年终告完工！ [精华] |
ykifoo
发贴: 36 
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 2008-10-27 23:19 
      步行桥项目简介（最好还是看英文哦） 不论是附近的朱家角地区，还是略远一点的苏州园林里，我们都可以找到一些曲折起伏的小桥，因而我们决定沿袭这一传统，用一座曲折的桥连接50米宽的淀浦河两岸，并通过折线桥型来对应两岸不同的基地条件：南岸平坦开阔安静的城市广场，北岸狭小繁忙的街区道路。 同时还来自江浙沪地区的历时人文参考——例如带有屋顶廊桥的想法——以及桥梁工程学、结构力学上的诸多考虑——例如弯矩、扭力图与立面的对应关系、支座支点与桥台的处理关系等等。 非对称的桥型带来一个最大的问题在于如何平衡桥身的巨大扭力，在这里我们应用了先进的立体空间桁架结构体系来解决这一问题，简单说来就是一根空间扭曲的桁架筒，并根据不同区域的受力情况而变化钢构件的疏密程度。 桥面及桥顶的木板铺装，除了对应上述廊桥的想法之外，还将是主要的景观表现要素：阳光下，它将映衬出鳞鳞波光；夜晚则在将安装与上部的景观灯反射至桥面，光芒遍布全桥内部，并在夜空中散漫开去。 DESCRIPTION OF THE PROJECT Learning from the bridges of the great water town of ZhuJiaJiao, or those from the delicate gardens in Suzhou, we decided to link both sides of the 50 meters wide river with a bent path. The bent axis responds to different access conditions and visually adapts to the surroundings. Our strategy of borrowing from local historical references and other varaibles of the site, together with the objective of revealing the structural performance of the bridge, will generate the final form of the project. The load-span relation recommends the use of the metal truss. In order to resist the strong torsion stress associated with the support-less winding shape of the bridge, we activate structurally all the sides of its distorted volume. Both shores of the river have a contrasting character. This fact is emphasized via designing asymmetric constraints for the structure. The bridge has a simple support on the transversal ramp that faces the rapid and narrow street at the northern access. On the contrary, there is a stiff connection with the longitudinal ramp that connects to the slow and large southern square. The elevation of the bridge adapts itself to the resulting asymmetric diagram of bending momentum. Trying to minimize the amount of different steel sections, we design a pattern that becomes denser according to the diagram of shear stress. As other samples from Chinese tradition, we understand that the bridge should provide for a dedicated space on the river, a room over the water, more than merely acting as an engineering device that solves a communication problem. The faces of both the roof and deck are covered with wooden skins. The contrast with the exposed steel profiles makes the structure appear lighter. Furthermore, the sloped ceiling serves as a large reflector for the artificial lighting that is embedded into the handrails. During the day as well, the inner surfaces will trap the glittering reflections of the sun on the water. |
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