Influential laws of concrete shrinkage and creep of composite girder cable-stayed bridge

被引：0

作者：

Chen, Liang ^{[1
,2
]}

Shao, Chang-Yu ^{[2
]}

机构：

[1] Department of Bridge Engineering, Tongji University, Shanghai,200092, China

[2] Shanghai Municipal Engineering Design Institute (Group) Co. Ltd., Shanghai,200092, China

来源：

Bridge Construction | 2015年 / 45卷 / 01期

关键词：

Creep - Box girder bridges - Composite beams and girders - Finite element method - Shrinkage - Bridge decks;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

To study the mechanism and time-dependant chrematistics of influences of the concrete shrinkage and creep on the composite girder cable-stayed bridge, the Second Zhangshu Ganjiang River Bridge (a semi-floating system composite girder cable-stayed bridge with double pylons, double cable planes and with a main span of 400 m) was taken as an example and was analyzed. The bridge professional software RM2006 was used to build up the finite element model for the whole bridge of the bridge, the time-dependant influential mechanism of the bridge, time-dependant influential factors of the different components of the bridge in operation period and the time-dependant responses of the different structural systems were studied. The results of the study show that the for the composite girder cable-stayed bridge, the initial axial strain in the cross section of the main girder caused by the concrete shrinkage and creep of the deck slabs is the main cause leading to the midspan deflection of the central span of the main girder and to the relaxation of the stay cables at the side spans. The initial flexural strain in the cross section of the main girder caused by the shrinkage and creep is the main cause leading to the negative moment occurrence in the main girder. The concrete shrinkage of the deck slabs and the concrete creep of the slabs under dead load are the main factors causing the relaxation of the stay cables at the side spans and the midspan deflection of the central span. The concrete shrinkage and creep of the pylons cause the relaxation of the stay cables nearby the pylons and cause the main girder to produce the local negative moment peak values. The arrangement of the vertical bearings at the pylons and the arrangement of the auxiliary piers may cause certain adverse influence to the time-dependant effect of the composite girder bridge. As judged from the above-mentioned, it is considered that the full floating system is more reasonable than other systems. ©, 2015, Wuhan Bridge Research Institute. All right reserved.

引用

页码：74 / 78