| 1. | In recent years , with the rapid development of large span prestressed concrete bridge in our country , the time dependent factors are becoming more and more important for engineering personnel , especially the shrinkage , creep of concrete and the relaxation of prestressed reinforcing bar , which depend on the time
近年来，随着大跨径预应力桥梁在我国的蓬勃发展，混凝土的收缩、徐变以及预应力钢束的松弛等时效因素对大跨径桥梁的影响也越来越受到人们的重视。 |
