摘要
压、拉双作用预应力技术是通常采用的后张法(或先张法)与后加压力法两种预应力方式的组合,称为Bi-Prestressing System。用这种预应力方式制作的预应力混凝土梁(以下均称PC梁),既能抵消外荷载在梁下缘产生的过大拉应力,又能抵消由此产生的梁上缘的过大压应力,从而可使主梁达到最佳应力状态,高跨比减至1/25～1/40。该结构适用于高速公路和城市进出口立交工程。本文介绍该预应力方式的原理、计算方法、施工技术及实桥例。
With additional compression and tension (Bi-Prestressing System) a PC
girder can so well behave to counteract effects on both lower flange and upper
flange due to loading of the girder that an optimal stress condition in the
girder can be realized and height to span ratio of the girder can be reduced
to 1/25--1/40. This kind of structure is suitable for grade-separations on
freeway and at the entrance and egress of urban roads. The principle, calcu-
lating method and construction details on the system and case history are
presented in this paper.
出处
《公路交通科技》
CAS
CSCD
北大核心
1990年第2期23-35,共13页
Journal of Highway and Transportation Research and Development
