Analysis of Shear Lag of Compression-bending Π-shaped Girder Considering Axial Displacement(PDF)
《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]
- Issue:
- 2017年05期
- Page:
- 196-202
- Research Field:
- Publishing date:
Info
- Title:
- Analysis of Shear Lag of Compression-bending Π-shaped Girder Considering Axial Displacement
- Author(s):
- ZHOU Shi-jun; SONG Gang
- School of Civil Engineering, Chongqing University
- Keywords:
- Π-shaped girder; shear lag; axial displacement; solid element; flexural stiffness
- PACS:
- -
- DOI:
- -
- Abstract:
- In the longitudinal displacement function of cross section, the axial displacement of cross section was introduced to describe the section deformation state of Π-shaped girder under axial compression and bending. Based on energy variation method, the governing differential equations coupled with axial displacement, vertical displacement and shear lag displacement were deduced, and the displacement solution of Π-shaped girder under axial compression and bending and its corresponding boundary conditions were obtained. Combined with ANSYS software, the simply supported girder and cantilever girder were analyzed by using solid element, the derived displacement solutions and its boundary conditions, and the validity and reliability of the method were verified. The results show that the shear lag effect makes the separation between neutral axis and centroidal axis on the section of Π shaped girder, and the section no longer rotates around the centroidal axis. Under the action of bending, the shear lag decreases the flexural stiffness of the section of simply supported girder and the section within quarter span on the cantilever fixed side, and increases the flexural stiffness of the section within three quarter span on the cantilever free side. Under the action of axial compression and bending, the shear lag caused by axial compression decreases the flexural stiffness of the section near the end of simply supported girder, and increases the flexural stiffness of the section near cantilever free end.
Last Update: 2017-09-11