01663091

Component

For continuous steel-concrete girder bridge, the primary concern related to cast-in-place concrete deck is the cracking at the top fiber of concrete deck. In order to minimize the development of tensile stress and to minimize the cracking potential on top fiber of concrete deck at intermediate supports of continuous steel-concrete composite girder bridge, jack-up prior concrete pouring and jack-down after concrete curing is a popular method. However, limited studies have been performed to examine the stress development during jack up/down processes and to evaluate the safety and performance of jack up/down method. This study aims at evaluating the safety and performance of the jack up/down method based on filed monitoring data that collected during construction of a continuous steel-concrete composite girder bridge. It is observed that the steel girder was nonuniformly raised during step-by step jacking operation. Furthermore, the monitored prestresses in concrete suggested that jack-up distance, prestressing tendon position, prestressing force, and material properties are important factors to the safety and serviceability of the concrete deck. Moreover, finite element models were developed to evaluate the accuracy of design assumptions.

This paper was sponsored by TRB committee AFH40 Standing Committee on Construction of Bridges and Structures.

18-06475

English

15p

2018

Transportation Research Board 97th Annual Meeting

Digital/other

Figures; Photos; References; Tables

Bridge construction; Bridge decks; Composite materials; Concrete; Finite element method; Girder bridges; Jacks (Mechanical equipment); Monitoring; Prestressing; Steel

Siyuan Bridge

Beijing (China)

Bridges and other structures; Construction; Highways

Transportation Research Board Annual Meeting 2018 Paper #18-06475

TRIS, TRB, ATRI

Jan 8 2018 11:40AM