Experimental Study on Shear Resistance of Existing Prestressed Concrete Hollow Slabs

Authors

LU Youfu, Shandong Hi-Speed Group Co ., Ltd., Jinan , Shandong 250098 , ChinaFollow
DI Jin, School of Civil Engineering , Chongqing University , Chongqing 400045 , China
QIN Fengjiang, School of Civil Engineering , Chongqing University , Chongqing 400045 , China
SUN Yifei, School of Civil Engineering , Chongqing University , Chongqing 400045 , China

Abstract

Prestressed concrete hollow slabs are widely used in small- and medium-sized span highway bridges in China.With the increase in load ratings,many hollow slab bridges built in early periods fail to meet the current specifications for shear bearing capacity.Nevertheless,these hollow slabs continue to function adequately under existing vehicle loads,making it essential to conduct an in-depth investigation into their shear bearing capacity.Shear bearing capacity tests were conducted on five 16 m-span hollow slabs dismantled from a renovation and expansion project,including three top slabs with a 15 cm cast-in-place concrete structural layer.Various parameters,such as load-displacement curves,web concrete strain,cracking loads,crack development patterns,failure modes,and ultimate loads of the hollow slabs,were determined.The findings reveal that the 16 m hollow slabs without the added concrete layer developed diagonal cracks followed by shear compression failure.For 16 m hollow slabs with the added concrete layer,the cracking load increased by 32%,and the shear bearing capacity increased by 22%.A comparison between the experimental results and the results according to the design code highlights the overly conservative nature of the current method for calculating the shear bearing capacity of hollow slabs.

Publication Date

8-15-2025

DOI

10.14048/j.issn.1671-2579.2025.04.019

First Page

152

Last Page

157

Submission Date

August 2025

Recommended Citation

Youfu, LU; Jin, DI; Fengjiang, QIN; and Yifei, SUN (2025) "Experimental Study on Shear Resistance of Existing Prestressed Concrete Hollow Slabs," Journal of China & Foreign Highway: Vol. 45: Iss. 4, Article 19.
DOI: 10.14048/j.issn.1671-2579.2025.04.019
Available at: https://zwgl1980.csust.edu.cn/journal/vol45/iss4/19

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