Abstract
This article presents a space frame lattice model for the analysis of stress of entire cross-section of bridge. The authors focused on analyzing the relatively weaker position of stress in box-girder section, using as an example the Xintan Bridge over the Qijiang River in Chongqing, China. The Xintan Bridge has a continuous prestressed concrete rigid frame with 75+130+75 m span. They calculated and analyzed the shear stress and principle tensile stress of the box girder cross-section in this bridge, using an innovative layout method of mixed internal and external prestressed tendons. They conclude that the space frame lattice model is accurate for calculating the stress state of a bridge. This model can simulate the process of long-term cracking as well as deflection of large-span pre-stressed concrete girder bridges.
Highlights
Introduction about space frame lattice modelAt present, the common integral calculation models for bridge structure are as following: 3-freedom plane straight beam model, 6-freedom space beam element model, and Hambly Shear Flexible plane grillage model (Hambly 1991)
The space bridge structure can be figured by the space frame lattice (Chao et al 2009; Xu 2008)
The principal tensile stress of concrete in the vertical web of box-girder is composed of the shear stress and normal stress and it can be counteracted by the vertical compressive stress provided by vertical prestressed bars
Summary
The principal tensile stress of concrete in the vertical web of box-girder is composed of the shear stress and normal stress and it can be counteracted by the vertical compressive stress provided by vertical prestressed bars.
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