|Table of Contents|

Experimental study on crack resistance of steel-UHPC composite beams in negative moment zone(PDF)

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

Issue:
2025年03期
Page:
15-25
Research Field:
建筑结构
Publishing date:

Info

Title:
Experimental study on crack resistance of steel-UHPC composite beams in negative moment zone
Author(s):
LI Lifeng1;  PENG Hao1;  ZOU Deqiang2;  HUANG Xinyi1;  LI Lingxiao2
(1. College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China; 2. China Construction Fifth Engineering Bureau Co., Ltd., Changsha 410004, Hunan, China)
Keywords:
steel-UHPC composite beam;  negative moment zone;  crack resistance;  crack width
PACS:
TU375
DOI:
10.19815/j.jace.2023.10088
Abstract:
In order to solve the cracking problem of bridge deck slab in the negative bending moment zone of steel-concrete continuous girders, it was proposed to use ultra-high performance concrete(UHPC)to replace part of normal concrete(NC)of bridge deck slab in the negative bending moment zone. The ultra-high mechanical property of UHPC was used to solve the cracking problem of bridge deck slab in the negative bending moment zone, and its crack resistance was studied. Three steel-UHPC composite beams were designed and tested for crack resistance in the negative bending moment zone, obtaining experimental data on crack load, mid-span displacement, crack width, and strain. A simple formula for calculating the crack width of bridge deck slab suitable for steel-UHPC composite beams was proposed based on domestic and foreign crack width calculation formulas. The reliability and applicability of the proposed formula for calculating the crack width of bridge deck slab were verified based on crack width test data from existing literature on steel-UHPC composite beams. The results show that UHPC can increase the cracking load in the negative bending moment zone of composite beams, and has the ability to suppress the development of cracks in bridge decks, which can significantly improve the crack resistance of bridge deck slab in the negative bending moment zone and effectively solve the cracking problem of bridge deck slab in the negative bending moment zone. The nominal stresses calculated based on the experimental results are all greater than the actual design values of the project, indicating that the structure using UHPC instead of NC in the negative bending moment zone has excellent crack resistance performance. It is recommended that the longitudinal laying length of UHPC in the negative bending moment zone of composite beams should be 0.2L-0.25L(L is the calculated span)and the laying thickness should be 60-70 mm.

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Last Update: 2025-06-01