Hell Gate sild New York 296m, Harbour Sydney (kõige laiem 49m). 10. Raudbetooni areng sillaehituses kuulsamad tegijad ja nende parimad tööd Terasest sai ehitada suurema sildega sildasid, kuid raudbetoon on odavam, lihtsamini hooldatav ja arhitektuurselt nägusam. Esimene 1860 Inglismaal Seedmouthi sild. Üldiselt rajati esimesed 1875-77 R/b leiutaja Monier 1876 16m pikkune 4m laiune sarrusbetoonsild jalakäiatesild. Tõeline meister oli Robert Maillart 34 silda Salginatobeli sild 1930 ava 90m tee laius 3,8m Eugene Freyssinet Plougastelli sild Prantsusmaal 1926-1930 pikkus 888m ava 188m. Sama mees leiutas ka pingebetooni. 11. Rippsildade areng (kuulsamad ja nende üldiseloomustused) Esimene ehitati Euroopasse 1741 üle Teesi jõe 21m avaga jalakäijate sild. Tee rippus kettide küljes. 19 saj saadi aru, et rippsild on odavaim, saleda konstruktsiooniga, lihtne ehitada, kuid seda teatud piirini, sest liiga pikad avadetailid olid ebastabiilsed.
compressive stresses in the arches. The Vauvray Bridge over the Seine was the record span at 430ft (131m), the deck being hung from hollow cellular arch ribs on wire hangers, coated with cement mortar, and supporting the road on light concrete deck trusses. The Vauvray Bridge was destroyed in World War II, leaving the Plougastel Bridge (1930) over the River Elon at Brest, with three spans of 567ft (173m), as the longest reinforced concrete arch span until 1942. Swiss engineer Robert Maillart designed three-hinged arches in which the deck and the arch ribs were combined to produce closely integrated structures that evolved into stiffened arches of very thin reinforced concrete and concrete slabs, as at the Schwandbach Bridge (1933), near Schwarzenbach (Switzerland). Maillart's early apprenticeship with Hennebique sharpened his awareness of the plastic character of the material. His profound understanding of reinforced concrete
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