Indeed, if both constant and shifting weights are taken into consideration, the extreme curves of exerted pressures form two lenticular surfaces whose lower contours meet at an acute angle. The Salginatobel Bridge (photo D.Zastavni 2010) These working drawings, as well as another one detailing the foundation block [7], constitute the core of the structural definition and therefore support the first steps of the design process. The rocky walls of the ravine provide the arch support, obviating the need for stone abutments. The bridge was officially opened on 18 August 1930. They clearly differ from the later drawings or calculus devoted to the checking and analysis of sections eleven arch bridges (including the Salginatobel), one girder bridge, and several mushroom-slab buildings are by Maillart. Even the [Salginatobel Bridge] cannot lay claim to complete sincerity of form. [6], The falsework was built by the Graubünden carpenter Richard Coray in late summer 1929, and the rest of the construction started in 1930. The Salginatobel Bridge between Schiers and Schuders is the best known bridge of Robert Maillart, and is widely recognised today as a structural monument of international importance. His best-known structure is the Salginatobel Bridge, completed in 1930. These Maillart-type arch bridges only look good in special situations as here over a gorge and against a mountainous background. [4] This bridge was destroyed by an avalanche in September 1927. Writing in 2000, Heinrich Figi said:[6]. Maillart, pp. Title: Microsoft Word - Structural Study 6 9-10.doc Created Date: 1/28/2015 7:19:03 PM The waterproofing and drainage were replaced and amended, and most of the existing concrete surface removed and replaced by shotcrete. [8] The parapets were completely rebuilt. In 1991, it was declared an International Historic Civil Engineering Landmark, the thirteenth such structure and the first concrete bridge so designated.[3]. The self-weight of the bridge is assumed as a uniformly distributed load; two point loads are assumed at quarter span of the bridge. Salginatobel Bridge is a road bridge, three-hinged arch bridge and reinforced concrete bridge that was built from 1929 until 1930. © 2020, American Society of Civil Engineers, Access my purchased publications and downloads, Make a donation to support ASCE's activities. From a conceptual point of view, the Salginatobel Bridge is an excellent structure. Completed in 1998, this repair work cost 1.3 million US dollars. [6] It carries a roadway 3.5 metres (11 ft) wide, supported on reinforced concrete pillars above the ends of the arches. [5], The Salginatobel bridge arch is 133 metres (436 ft) long in total, and its main element is a hollow concrete box girder over the central part of the arch. In conjunction with contractor Florian Prader, Maillart's design was the least expensive of nineteen entries. In 1991, it was declared an International Historic Civil Engineering Landmark … "The Salginatobel Bridge looks as if it belongs in its magnificent setting. It is not an intrusion, but it is an elegant, serviceable, important structure." David P. Billington, "The Deck-Stiffened Arch Bridges of Robert Maillart," Journal of the Structural Division of the American Society of … The bridge includes reinforcement in both the spandrel (pillar) walls and the arch to control cracking. It was constructed across an alpine valley in Schiers, Switzerland between 1929 and 1930. The Salginatobel Bridge, spanning the Salgina Valley ravine, is the earliest surviving three-hinged, hollow box arch bridge designed by Robert Maillart. The project is located in Schiers and Schuders, Schiers, Grisons, Switzerland. The German bridge engineer Fritz Leonhardt has suggested that:[12]. In this design, the concrete arch ring and the concrete deck are joined by longitudinal concrete sidewalls, giving the structure the cross-section of a hollow box. Salginatobel Bridge is a reinforced concrete arch bridge designed by Swiss civil engineer Robert Maillart.It was constructed across an alpine valley in Schiers, Switzerland between 1929 and 1930. As with his Schwandbach Bridge and Vessy Bridge, the structure's fame among civil engineers is a consequence of the techniques involved and the elegance of its design rather than its prominent location: it serves a town of about 2,500 people but is often visited by designers. In the 51 metres (167 ft) span Tavanasa bridge, the arch is thinnest at its crown and springing points, thickening in between to reflect the shape of its bending moment diagram. Its visual elegance ... goes together with its technical brilliance. Maillart's 1901 invention of the concrete hollow box design became a major bridge building concept. Although Maillart didn't win the contract for a replacement bridge, he entered a competition the following year for the bridge at Salginatobel, with a three-hinged arch spanning 90 metres (300 ft) that used the same overall form as at Tavanasa. 4. 303-4, cited in Billington, 2003, p. 60, International Historic Civil Engineering Landmark, "World Monument Salginatobel Bridge - International Historic Civil Engineering Landmark", "#353, Robert Maillart, Engineer, June 24 - October 13, 1947", Swiss inventory of cultural property of national and regional significance, Sightseeing Graubünden, Switzerland, official tourism board suggestions and location, https://en.wikipedia.org/w/index.php?title=Salginatobel_Bridge&oldid=973424376, Articles with German-language sources (de), Infobox mapframe without OSM relation ID on Wikidata, Pages using infobox bridge with map caption without map type or map image, Creative Commons Attribution-ShareAlike License, 1947, the bridge was featured with other of Maillart's works in a four-month exhibit at the, Salginatobel Bridge was designated a Swiss, 1991, it was designated an International Historic Civil Engineering Landmark by the American Society of Civil Engineers, This page was last edited on 17 August 2020, at 04:09. Maillart's design ran contrary to the prevailing view that bridges should be massive. Salginatobel Bridge is a reinforced concrete arch bridge designed by Swiss civil engineer Robert Maillart. Maillart was not entirely satisfied with the bridge, writing after its completion that its soffit should have been a pointed rather than a pure curved arch, if it were properly to match his structural analysis:[13]. He believed massive structures would more easily crack and shrink from temperature fluctuations. [8], The bridge has received widespread attention since its innovative design and construction, including considerable praise from other bridge engineers, architects and architectural historians. David P. Billington has been particularly enthusiastic about the bridge:[7]. Such works at Maillart's, being at the very highest level of engineering achievement and being works of art, must be protected. [7], Although regarded as a pioneering work, several aspects of its construction lacked durability, such as the absence of bridge deck waterproofing, low concrete cover and poor drainage. Form finding of the Salginatobel bridge The design of the Salginatobel bridge is based on the superposition of the thrust lines for two load cases.