1.混凝土桥的发展桥梁的历史可以追朔到纪元以前。但混凝土桥的历史则很短,在1900年前后,代替石砌桥的混凝土桥不过是刚刚兴起。最初钢筋混凝土只用于桥面板,不久又用于拱肋。由弗莱西奈设计跨越爱伦河的布尔加斯特桥 1. The development of concrete bridges The history of the bridge can be traced back to the era before. However, the history of the concrete bridge is very short. Before 1900, the concrete bridge instead of the stone bridge was just emerging. Initially, reinforced concrete was used only for deck slabs and soon for arch ribs. Designed by Fricision on the Burgaster Bridge across the River Ellen