高强螺旋筋约束活性粉末混凝土局压承载力试验

发布时间：2018-03-07 03:09

本文选题：螺旋筋　切入点：活性粉末混凝土　出处：《土木工程学报》2014年08期 　论文类型：期刊论文

【摘要】：应用高强螺旋筋使活性粉末混凝土局压区形成约束核心区,以避免活性粉末混凝土局压区突然脆性劈裂破坏,可达到改善局压区正常使用性能、提高其延性与局压承载力的目的。以局压面积比、局压面积与核心混凝土面积比、螺旋筋率为基本参数,完成了12个970MPa级高强螺旋筋约束约束活性粉末混凝土轴心局压承载力试验,结果表明50%的试件破坏时螺旋筋不小于其比例极限,反映出高强螺旋筋强度较充分利用;试件的初裂荷载较小、开裂后至破坏前表面裂缝发展缓慢,破坏导致承压面附近局部崩裂但试件相对完整,说明螺旋筋对核心混凝土的约束显著。分析了主要参数对局压承载力提高系数的影响,结合未配筋活性粉末混凝土局压试验结果,提出高强螺旋筋约束活性粉末混凝土局压承载力实用计算方法。
[Abstract]:The confined core area of reactive powder concrete (RPC) is formed by using high strength spiral reinforcement to avoid sudden brittle splitting failure in the RPC local compression zone, and the normal service performance of RPC can be improved. The purpose of improving its ductility and local compression capacity is to take the ratio of local pressure area to core concrete area and the ratio of spiral reinforcement as the basic parameters. The experimental results show that the strength of 50% specimens is not less than its proportional limit, which shows that the strength of high strength spiral bars is fully utilized. The initial crack load of the specimen is small, and the crack develops slowly from the crack to the front surface of the failure, which results in the local crack near the bearing surface, but the specimen is relatively intact. The effect of main parameters on the coefficient of local compressive capacity is analyzed, combined with the test results of unreinforced reactive powder concrete. A practical method for calculating the bearing capacity of high strength spiral reinforced concrete confined by reactive powder concrete (RPC) is presented.
【作者单位】：哈尔滨工业大学;
【基金】：黑龙江省自然科学基金(E200835) 国家自然科学基金(51108124) 中央高校基本科研业务费专项资金(HIT.KISTP.201428) 黑龙江省应用技术研究与开发计划项目(2013G0763)
【分类号】：TU528

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