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Experiment on direct shear performance of socket connection between precast pier and pile cap(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2025年2期
Page:
60-74
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Experiment on direct shear performance of socket connection between precast pier and pile cap
Author(s):
JIANG Hai-bo1;  XIE Si-yuan1;  LI Ming-yi1;  CHEN Ming-zhu1;  ZHOU Zhi-guo2;  SUN Xiao-li3
(1. School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006,Guangdong, China; 2. Guangzhou Institute of Building Science Group Co. Ltd., Guangzhou 510440, Guangdong,China; 3. Guangzhou Municipal Engineering Testing Co. Ltd., Guangzhou 510520, Guangdong, China)
Keywords:
bridge engineering;  direct shear performance;  push-out test;  wet-joint;  socket connection
PACS:
U444
DOI:
10.19721/j.cnki.1671-8879.2025.02.006
Abstract:
To investigate the effects of different parameters on the direct shear bearing capacity of socket connection, the types of grouting material and joint interface, width of joint and number of key-joints at the socket connection were taken as research objects. The influencing mechanism of direct shear performance of the socket connection was investigated based on experiment and finite element model. Twelve push-out specimens of socket connections were designed. The experiment on direct shear performance of socket connection was conducted by using the double-sided direct shear, and the specimens' cracking loads, crack patterns, failure modes were obtained. The research results show that the direct shear bearing capacities of specimens with corrugated steel pipe shear grooves are 24.9%-46.4% lower than those with key-joint shear grooves, indicating that the interface connection performance of corrugated steel pipe shear groove structure is not conducive to structural integrity.Three C90 high-performance grouting materials have little effect on the direct shear bearing capacity of key-joint specimen, but affect the development of cracks of corrugated steel pipe shear groove specimen. When the steel fiber reinforced concrete(SFRC)was used as the grouting material, the bending resistance of the specimen is better, it is beneficial to restrain the narrow crack development. For key-joint shear groove specimens, when the width of joint increases from 5 cm to 10 cm, the direct shear bearing capacities of specimens decrease by 12.2%-36.5%. When the number of key-joints increases from single key-joint to double key-joints, the direct shear bearing capacities of specimens increase by 19.4%-47.6%. After increasing the single key-joint to multi key-joints, the direct shear bearing capacities of specimens increase by 51.45%-118.13% according to the extensive analysis of local push-out finite element models. The direct shear bearing capacities of specimens with corrugated steel pipe shear grooves reduce by 12.06%-33.58%, compared to those with key-joint shear grooves. The average direct shear bearing capacities of specimens calculated using the American Association of State Highway and Transportation Officials(AASHTO)specification is 45.9% lower than experiment results, while the average direct shear bearing capacities of specimens calculated using the Japanese Society of Civil Engineers(JSCE)specification is 11.3% higher than experiment results. Therefore, the calculated results of the AASHTO specification are conservative, while the calculated results of the JSCE specification are closer to experiment results. 7 tabs, 17 figs, 30 refs.

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Last Update: 2025-04-01