|Table of Contents|

Experimental study and theoretical calculation on flexural performance of UHPC-T beams(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2023年01期
Page:
65-74
Research Field:
建筑结构
Publishing date:

Info

Title:
Experimental study and theoretical calculation on flexural performance of UHPC-T beams
Author(s):
ZHU Qi;  YE Lihao;  CAI Wei;  XIE Wen
(School of Civil & Environmental Engineering and Geography Science, Ningbo University, Ningbo 315211, Zhejiang, China)
Keywords:
UHPC-T beam;  flexural performance;  cracking moment;  ultimate bending moment;  post-tensioned prestress
PACS:
TU375.1
DOI:
10.19815/j.jace.2021.08086
Abstract:
In order to study the influence of reinforcement ratio and prestress on the flexural performance of ultra-high performance concrete T-beam(UHPC-T beam), four UHPC-T beams and one ordinary concrete T-beam were designed and manufactured. The whole process characteristics of T-beam loading failure were studied by three-point bending test, and the key performance parameters such as cracking moment and ultimate bending moment of T-beam were calculated by theoretical formula. The results show that the reinforcement ratio has little effect on the cracking load of UHPC-T beam. Under the same reinforcement ratio, the ultimate bearing capacity of prestressed UHPC-T beam is about 1.4 times that of UHPC-T beam, and the ultimate bearing capacity of UHPC-T beam is about 2 times that of ordinary concrete T beam, indicating that both prestress and UHPC can significantly improve the ultimate bearing capacity of T beam. Compared with the ordinary concrete T beam, the cracks of UHPC-T beam are fine and dense, the maximum crack width develops slowly at the initial stage of loading, and the crack width and its number are significantly reduced. Compared with UHPC-T beam, prestressed UHPC-T beam can effectively inhibit the generation and development of cracks, indicating that prestress and UHPC can improve the crack resistance of T beam. The strain of normal section concrete in the mid-span of each test beam is basically proportional to the load, indicating that the plane section assumption is also applicable to prestressed UHPC-T beams and UHPC-T beams. The theoretical cracking moment and ultimate bending moment of T beam are in good agreement with the corresponding test results, and the relative error between them is less than 20%, which meets the engineering design requirements.

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Last Update: 2023-01-01