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首页> 外文会议>Transportation Research Circular no.E-C104; TRB(Transportation Research Board) Annual Meeting; 200601; Washington,DC(US) >The Interstate Highway System and the Development of Prestressed Concrete Bridges
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The Interstate Highway System and the Development of Prestressed Concrete Bridges

机译：州际公路系统与预应力混凝土桥梁的发展

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摘要

When the Highway Act was passed in 1956, prestressed concrete was an emerging technology and the application of that technology to bridges was still in its infancy. In the decade prior to the passage of the act only 2% of the bridges built in the United States utilized prestressed concrete as their primary superstructure elements. By the beginning of the new millennium, the number had grown to just under 49%. Of the 47,000 Interstate system bridges built since the passage of the act, 29% have utilized prestressed concrete and 25% utilized reinforced concrete. It is clear that concrete has played a major role in the construction of interstate bridges. It is also clear that the construction of the Interstate system has played a major role in the utilization and development of prestressed concrete in bridges since 29% of all bridges built since the passage of the act use prestressed concrete. Because of its importance as a material component of the interstate system, an examination of the evolution of the technology in the United States is presented. This paper presents the general historical development of prestressed concrete bridges from the early 1940s to the present. This paper also presents some of the challenges that have to be faced by today's prestressed concrete bridge designers as well as some of the needs anticipated for the future.
机译：1956年通过《公路法》时，预应力混凝土是一种新兴技术，该技术在桥梁上的应用仍处于起步阶段。在法案通过之前的十年中，在美国建造的桥梁中，只有2％的桥梁使用预应力混凝土作为主要的上部结构元素。到新千年之初，这一数字已增长到不足49％。自法案通过以来建造的47,000个州际系统桥梁中，有29％使用了预应力混凝土，而25％使用了钢筋混凝土。显然，混凝土在州际桥梁的建设中发挥了重要作用。同样清楚的是，州际体系的建设在桥梁中预应力混凝土的利用和发展中起了重要作用，因为自通过法案以来建造的所有桥梁中有29％使用了预应力混凝土。由于它作为州际系统的重要组成部分，因此对美国技术的发展进行了考察。本文介绍了预应力混凝土桥梁从1940年代初期到现在的总体历史发展。本文还介绍了当今的预应力混凝土桥梁设计人员必须面对的一些挑战，以及对未来的预期需求。

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