|Table of Contents|

Shear behavior of composite girder with prestressed UHPC channel segments and monolithic concrete slab(PDF)

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

Issue:
2024年03期
Page:
54-64
Research Field:
建筑结构
Publishing date:

Info

Title:
Shear behavior of composite girder with prestressed UHPC channel segments and monolithic concrete slab
Author(s):
CHEN Baochun1;  CHEN Yicong1;  ZHOU Jialiang2;  LIU Yongjian3
(1. College of Civil Engineering, Fuzhou University, Fuzhou 350116, Fujian, China; 2. College of Civil Engineering, Putian University, Putian 351100, Fujian, China; 3. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China)
Keywords:
ultra-high performance concrete;  prestressed channel segmental girder;  monolithic concrete slab;  composite girder;  shear behavior
PACS:
TU378; U444
DOI:
10.19815/j.jace.2024.04031
Abstract:
Prefabricated ultra-high performance concrete(UHPC)channel segments are connected by dry joints and prestressed tension to form a channel girder, which is then combined with a cast-in-place concrete slab to form a composite girder, which is called as prestressed UHPC composite segments girder with monolithic concrete slab(PUCS-MCS composite girder). It is a new type of bridge structure that can fully utilize the performance of different materials, provide good overall performance, and is easy to be constructed. To explore its shear behavior, experimental study was conducted on the shear behavior of nine specimens with the parameters of dry joint number, number of the shear keys in the joint, shear-to-span ratio, steel fiber volume fraction of UHPC, stirrup ratio, and longitudinal reinforcement ratio. The effects of each parameter on the deflection, failure mode, and shear capacity of the specimens were analyzed. Based on the experimental study results, a formula was proposed for predicting the shear capacity of PUCS-MCS composite girder. The results show that the PUCS-MCS composite girders are all failed in shear compression. The load-deflection curves of all specimens are similar before cracking, and the stiffness of the PUCS-MCS composite girders weaken more significantly than that of monolithic girder without joint after cracking. The shear capacity of PUCS-MCS composite girders increases with the number of the shear keys in the joint, the steel fiber volume fraction of UHPC, the stirrup ratio, and longitudinal reinforcement ratio, and decreases with the dry joint number and shear-to-span ratio. Among these parameters, the most significant effects are induced by the number of shear keys and dry joints, and the least are the steel fiber volume fraction and the stirrup rate. Therefore, a PUCS-MCS composite girder can be made without stirrup, and the UHPC can be mixed with low steel fiber volume fraction.

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Last Update: 2024-05-20