Effect of longitudinal reinforcement and prestressing on stiffness of composite beams under hogging moments

被引：30
作者：
Sun, Qili [1 ]
Yang, Yue [1 ]
Fan, Jiansheng [1 ]
Zhang, Yanling [2 ]
Bai, Yu [3 ]
机构：
[1] Tsinghua Univ, China Educ Minist, Key Lab Civil Engn Safety & Durabil, Dept Civil Engn, Beijing 100084, Peoples R China
[2] Shijiazhuang Tiedao Univ, Sch Civil Engn, Shijiazhuang 050043, Peoples R China
[3] Monash Univ, Dept Civil Engn, Melbourne, Vic 3800, Australia
来源：
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH | 2014年 / 100卷
基金：
中国国家自然科学基金;
关键词：
Composite steel-concrete beam; Prestressing; Experiment; Hogging moment; Crack; EXTERNAL TENDONS; STEEL; GIRDER;
D O I：
10.1016/j.jcsr.2014.04.017
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
To investigate the stiffness of steel-concrete composite beams subjected to hogging bending moments and their enhancement through prestressing using external tendons, laboratory experiments were conducted on five steel-concrete composite beams. Three of the beams were two-span continuous composite beams with box steel girders and the others were simply supported. The parameters investigated included the amount of longitudinal reinforcement and the arrangement of prestressing. From the experimental results, it was found that prestressing significantly improved the cracking moment of composite beams, and crack spacing was dominated by the transverse reinforcement spacing. The stiffness enhancement and crack control suggest the advantages to the mechanical performance of composite beams prestressed by external tendons. A theoretical model is proposed to estimate the effective stiffness of a composite beam subjected to hogging bending moments, taking into account the tension stiffening effect of concrete cracking. (C) 2014 Elsevier Ltd. All rights reserved.
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页码：1 / 11
页数：11
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