【正文】 footbridge is suspended on the leaning arch, and the very warp echoes to the stream of visitors from lower reaches of the river. Balance is achieved by properly setting leaning arch, which sustains most of the loads, and the horizontal curving deck. The arch is across the footpath, structurally supported by scattered cables, and at the same time, main beam is simplified into a steel wellproportioned shows. The record of design’s evolution showed how the typical arch is gradually weakened, and the geometrical form bee more and more plex, which emphasize the impression of movement. Along the interior side of its curving deck, there is a series of low weight cables, each of which links the arch and horizontal deck, weaving a beautiful curve by gradually changing the very angle. In a vertical plane, all cables extend outward, whose imaginary focus alludes a rotary trend different from the axis of the steel arch. The forces generate a curve at the top of arch. Additionally, straight side of arch and cables converging in the middle of the arch form a peculiar bination ultimately. The piers not only transfer the concentrated loads to the ground equably but also serve as circumscription between the location and the abstract space occupied by bridge itself. An apparent disequilibrium or rather a sense of frozen movement is heightened by the lightness of the structure. Scattered sunlight of Basque casts continuously varied shadow on these neat pressed bars, achieving dramatic effect. Truss Another representative is Wettstein Bridge across Rhine, in Basel, Switzerland. The main arches secedes other auxiliary elements to express separately, who sustain the all weight of bridge. The oblique truss arch dramatically eliminates both its own weight and the ponderosity of profile. It does reach one milestone of creating the opportunity to install thinner across section. In order to distribute the concentrated load into the sidepush load path and to strengthen the pressed arch, it is of structural importance to reinforce the longitudinal stiffness. This desired stiffness is provided by a pair of tetrahedrons, whose lower chords, constituting an even curve, properly serve as foil to the outline of main arch. As a whole, the details of this bridge explain more on how loads are transferred through nodes and how nodes influence stress shows. This design embodies a typical bridge aesthetic style of middle Europe. The bridge towers, the classical basic proportion and the details of steel structure all remind people of the ancient bridges in Vienna or Paris. Slope and curved bridge The giant volume of Kumamoto Bridge connects three islands of Amakusashoto in the South Japan. Fishery has a long history, which creates a harmonious relationship between local inhabitants and natural environment. So this emotional need must be properly responded to. The curved line can meets this demand, but it will generate a rotary trend of movement. As an important connect among three islands, the higher traffic capacity is a vital factor. What’s more, gale often appears in beachfront, which should be considered along with the expected traffic flow. The ultimate design is a slope and curved bridge with repetitive steel box section. The outlook is like a huge arch, which curves, contorts, and ascends. At the first glance, its appearance doesn’t measure up to the curve style highway engineers are used to, which is imposed on natural topography and results in discordance with surroundings in many American freeways executed. Fortunately, Kumamoto Bridge blends well with its location and echoes to the islands it connects in space. And the simplicity in both structure and appearance resists the danger to bee a daredevil manmade structure or to exaggeratedly express its show. Fulldepth box section is good at being contorted, and hence it can resist the rotary trend of movement of the huge prominent curve. The concave defense boards are set along the edge of deck. They have been adjusted according to wind tunnel results to make pavement and bikeway are in area where airflow stands almost still. Thus it protects passen