塑性铰区采用纤维增强混凝土柱变形能力计算方法研究_秦玮琳_梁兴文_徐洁

塑性铰区采用纤维增强混凝土柱变形能力计算方法研究_秦玮琳_梁兴文_徐洁_段小东

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发布时间：2022-05-03

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采用简化的纤维增强混凝土应力-应变关系，根据截面力的平衡方程和截面变形的平截面假定，推导出塑
性铰区采用纤维增强混凝土柱不同极限状态时的曲率。根据柱的曲率分布规律，推导出由柱弯曲变形所引起的柱
顶水平位移; 采用 Sezen 模型推导出由柱底纵筋与混凝土粘结滑移所引起的柱顶水平位移，再考虑柱剪切变形引起
的柱顶水平位移就得到总的柱顶水平位移。与试验结果对比表明，塑性铰区采用纤维增强混凝土柱在开裂荷载、
屈服荷载、峰值荷载、极限荷载作用下的位移计算值与试验值吻合较好。［关键词］纤维增强混凝土; 钢筋混凝土柱; 变形能力; 位移
中图分类号: TU377. 9 + 4 文献标识码: A 文章编号: 1002-848X( 2015) 20-0063-06
Study on calculation method for deformability of reinforced concrete
columns with fiber reinforced concrete in plastic hinge region
Qin Weilin1，Liang Xingwen1，Xu Jie2，Duan Xiaodong3，Zhang Bo3 ( 1 School of Civil Engineering，Xi'an University of Architecture and Technology，Xi'an 710055，China;
2 School of Civil Engineering，Shaanxi Polytechnic Institute，Xianyang 712000，China;
3 China Northwest Architecture Design and Ｒesearch Institute Co．，Ltd．，Xi'an 710018，China)
Abstract: The curvatures of reinforced concrete columns with fiber reinforced concrete in plastic hinge region in different
ultimate limit states were derived according to the simplified fiber reinforced concrete stress-strain relationship as well as
section force static equilibrium equation and plane cross-section assumption of section deformation． According to the
curvature distribution law of the column，the top horizontal displacement caused by the column bending deformation was
derived． The Sezen model was used to derive the top horizontal displacement caused by the bond-slip between longitudinal
reinforcement and concrete at column bottom． The top horizontal displacement caused by shear deformation was considered
as well． Above all，the total horizontal displacement was obtained． Compared with the test results，the calculated
displacements under the actions of cracking load，yield load，peak load and ultimate load are in good agreement with the
test results when the fiber reinforced concrete is adopted in plastic hinge region of reinforced concrete columns．
Keywords: fiber reinforced concrete; reinforced concrete column; deformability; displacement
* 国家自然科学基金项目( 51278402，51078305) 。
作者简介: 秦玮琳，硕士研究生，Email: 13228060426． com@ 163． com。 0 引言
基于性能的抗震设计要求对结构的变形能力
进行定量评价，以满足具体量化的多重性能目标
要求。框架结构中柱的变形能力决定着结构的变
形能力，为了改善钢筋混凝土柱的变形能力及抗
震性能，文献［1］～［3］提出了一些改进措施，如
采用高强箍筋柱、改善箍筋形式、采用钢纤维混凝
土等。
纤维增强混凝土( Fiber Ｒeinforced Concrete，简称 FＲC) 是一种高韧性的混凝土。研究［4，5］表明，
FＲC 在各种荷载作用下呈现出高延展性，并表现
出显著的应变硬化特性和多裂缝开展特性。耗能
减震是高层建筑常用的抗震方法之一，通常是在
结构的某些部位，如节点、连接处装设阻尼器。
FＲC 的超高韧性使之成为一种很好的耗能减震材
料，故本文尝试在柱的塑性铰区采用 FＲC，在柱的
其余部位仍采用普通混凝土。通过对 9 根塑性铰
区采用 FＲC 的柱( 简称 FＲC 柱) 的验证性试验，并
重点对其变形能力与钢筋混凝土柱的变形能力进
行对比分析，研究塑性铰区采用 FＲC 的柱的变形
计算方法。