Calculation of transverse bending moments of shear key of assembled concrete hollow slabs(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2019年05期
- Page:
- 88-96
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Calculation of transverse bending moments of shear key of assembled concrete hollow slabs
- Author(s):
- YI Hanbin; YU Bo
- (1. School of Civil Engineering, Changsha University of Science and Technology, Changsha 410076, Hunan, China; 2. Jiangxi Longspan Bridge & Tunnel Research and Design Institute Co. Ltd., Nanchang 330025, Jiangxi, China)
- Keywords:
- bridge engineering; hollow slab; shear key; orthotropic plate method; transverse bending moment
- PACS:
- -
- DOI:
- -
- Abstract:
- Amid at the traditional articulated plate method regarded the hinge joint structure as a hinge without transverse bending stiffness, the transverse bending moment of the hinge joint cannot be solved，and there was no calculation method for the transverse bending moment of the hinge joints in existing codes. Therefore, based on the orthotropic plate method, the precast concrete hollow slab structure was compared to the orthotropic plate. The orthotropic plate deflection differential equation and an analysis of transverse bending of the rectangular plate simply supported edges of the solution formula were derived. MATLAB was used as the corresponding calculation program. Taking spans of 10, 13, 16, and 20 m of prestressed concrete hollow slabs as examples, through parametric analysis of different span L and bridge width B, the distribution regularity of the hinge moment of the hollow slab were discussed. Because the theoretical calculation of the horizontal bending moment of the joint was complicated, so according to the results of the parametric analysis, the calculation method of the doublefold design of the transverse bending of the joint was proposed. Based on the calculation of the midsection bending moment design value, the design calculation method obtains the maximum transverse bending moment of the other section joints according to the recommended design curve. The results show that the maximum lateral bending of the joint is under the vehicular load. The moment is divided into a positive and negative bending moment. The theoretical calculation method proves that the lateral positive bending moment effect of the joint seam is not much different from the negative bending moment effect. When the load laterally changes from one center position to the other side, the transverse negative bending moment of joint seam forms, and the maximum value appear at the center of the bridge width. The ratio of the transverse bending moment of the midspan section of the hollow span in the same span is the same as that of the other sections. The curve of the transverse bending moment along the longitudinal direction is difference with the sinusoidal halfwaves assumed by the traditional hinge plates. The proposed method can provide a theoretical reference for joint bending design. 4 tabs, 15 figs, 25 refs.
Last Update: 2019-10-16