受压区局部约束塑钢纤维轻骨料混凝土梁的抗弯性能

doi:10.11896/cldb.20020062

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Abstract In order to improve the flexural performance of the beam, six reinforced plastic steel fiber reinforced lightweight aggregate concrete beams were designed by using rectangular hoops to restrain the local compression area. The influence of the longitudinal reinforcement ratio and the concrete strength on the flexural mechanical properties of the beam was analyzed and the finite element analysis was carried out. The results show that when stirrups are used to restrain the concrete in the compression zone, the ultimate compressive strain in the local compression zone increases, and the bearing capacity and ductility of the specimen increase significantly; with the increase of reinforcement ratio, the bearing capacity of the specimen increases significantly, and the over reinforcement failure of the beam with high reinforcement ratio is improved obviously; with the increase of concrete strength in the restraint zone, the bearing capacity of the beam increases, while the ductility decreases. The results of finite element analysis show that the ultimate compressive stress of the concrete in the compression area becomes larger after the stirrup is placed locally in the compression area, which greatly improves the stress concentration in the compression area in the middle of the beam span, thus inhibiting the crushing failure of the concrete at the edge of the compression area of the beam, and improving the bearing capacity and ductility of the beam.

Key words： plastic steel fiber lightweight aggregate concrete bearing capacity ductility

Published: 10 May 2021

CLC number:

TU528.2

Fund:National Natural Science Foundation of China (51368042), Program for Young Talents of Science Technology in University of Inner Mongolia Autonomous Region (NJYT-18-A06).

About author:: Jiangang Niu received his Ph.D. in structural engineering from the School of Civil Engineering, Xi'an University of Architecture and Technology in December 2008. Since January 2009, he has been engaged in teaching and scientific research in the School of Civil Engineering, Inner Mongolia University of Science and Technology. His main research direction is fiber lightweight aggregate concrete, durability of concrete structure and sustainable development of building structure. After returning to school, he presided over four projects of National Natural Science Fund and two projects of Inner Mongolia Natural Science Fund.
Wenming Xu graduated from Qingdao University of Science and Technology in June 2017 with a bachelor of engineering degree. Since September 2018, has been studying inInner Mongolia University of Science and Technologyfor master's degree, mainly engaged in fiber lightweight aggregate concrete, durability of concrete structure and sustainable development of building structure.

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Cite this article:

NIU Jiangang,XU Wenming,LIANG Jian. Flexural Behavior of Plastic Steel Fiber Reinforced Lightweight Aggregate Concrete Beams Confined Locally in Compression Zone[J]. Materials Reports, 2021, 35(8): 8056-8063.

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http://www.mater-rep.com/EN/10.11896/cldb.20020062 OR http://www.mater-rep.com/EN/Y2021/V35/I8/8056

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