Behavior and strength of headed stud shear connectors in ultra-high performance concrete of composite bridges
作者机构：Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of EducationSchool of Civil EngineeringSoutheast UniversityNanjing 211189China
出 版 物：《Frontiers of Structural and Civil Engineering》 (结构与土木工程前沿（英文版）)
年 卷 期：2019年第13卷第5期
页 面：1138-1149页
核心收录：
学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学]
基 金：supported by the National Key R&D Plan the Fundamental Research Funds for the Central Universities
主 题：ultra-high performance concrete studs shear strength FE analysis push-out test
摘 要：This study presents an experimental and numerical investigation on the static behavior of headed stud shear connectors in ultra-high performance concrete (UHPC) of composite bridges. Four push-out specimens were tested. It was found that no cracking, crushing or splitting was observed on the concrete slab, indicating that UHPC slab exhibited good performance and could resist the high force transferred from the headed studs. The numerical and experimental results indicated that the shear capacity is supposed to be composed of two parts stud shank shear contribution and concrete wedge block shear contribution. The stiffness increment of a stud in UHPC was at least 60% higher than that in normal strength concrete. Even if the stud height was reduced from 6d to 2d, there was no reduction in the shear strength of a stud. Short stud shear connectors with an aspect ratio as small as 2 could develop full strength in UHPC slabs. An empirical load-slip equation taking into account stud diameter was proposed to predict the load-slip response of a stud. The reliability and accuracy of the proposed load-slip equation was verified by the experimental and numerical load-slip curves.
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