张望喜 胡彬彬 易伟建

摘 要：为完善钢筋和纤维增强复合材料（FRP）筋混合配筋混凝土偏心受压构件正截面 承载力计算方法，基于已有钢筋和玻璃纤维增强复合材料（GFRP）筋混合配筋混凝土偏压构件试验，通过试验现象和破坏形态归纳出三种典型的破坏类型，进而分析各破坏类型之间的界限，给出了相对界限受压区高度.利用ABAQUS进行参数分析，得到混合配筋混凝土偏压构件二阶弯矩增大系数表达式，考虑基本假定以及二阶效应的影响，推导了矩形截面偏压构件 正截面承载力计算公式.通过对比计算结果与试验结果，发现本文建议的计算公式具有很好的准确性和实用性（试验值与计算值之比Nu，t / Nu，e的均值为0.99，标准差为0.053），可为混合 配筋混凝土偏压构件在实际工程中的应用和推广提供一定的理论指导和设计借鉴.

关键词：混合配筋;偏压构件;正截面;承载能力;计算理论

中图分类号：TU375.4 文献标志码：A

Calculation Theory and Method of Normal Section Bearing Capacity of Eccentric Compression Member Reinforced with

Steel Bars and Fiber Reinforced Polymer Bars

ZHANG Wangxi1，2?，HU Binbin2，YI Weijian1，2

（1.Hunan Provincial Key Laboratory on Diagnosis for Engineering Structures（Hunan University），Changsha 410082，China;

2.College of Civil Engineering，Hunan University，Changsha 410082，China）

Abstract：To improve the calculation method of normal section bearing capacity of eccentric compression mem-ber reinforced with steel bars and Fiber Reinforced Polymer（FRP）bars，this study summed up three typical failure types，then analyzed the limit failures among each failure type，and gave relative-boundary compressive region′s height based on several tests of concrete members reinforced with steel bars and Glass Fiber Reinforced Polymer（GFRP）bars under eccentric compression.The second-order moment augmentation factor was obtained through pa-rameter analyses using ABAQUS.By considering the basic assumptions and the influence of the second-order bend-ing moment，the calculation formulas for the normal section bearing capacity of the rectangular section eccentric com-pression members were derived.By comparing the calculation results with the test results，it was proved that the cal-culation formulas proposed in this paper had good accuracy and practicability（the mean value of the ratio Nu，t/Nu，e between the experimental values and the calculated values was0.99and the standard deviation was0.053），whichcan provide a certain theoretical guidance and design reference for the application and promotion of concrete eccen-tric compression members reinforced with FRP bars and steel bars in practical engineering.

Key words：hybrid reinforcement;eccentric compression member;normal section;bearing capacity;calculation theory

钢筋混凝土結构耐久性问题引起了人们的广泛关注，钢筋锈蚀是造成钢筋混凝土结构过早失效的主要原因之一，各国每年花费大量的人力与物力用于结构加固或替换[1].目前，减少钢筋锈蚀的方法主 要有：增大混凝土的保护层厚度、提高混凝土的密实 性、在钢筋表面涂抹环氧树脂等[2-3]，虽然这些方法 延缓了钢筋的锈蚀，但难以从根本上解决混凝土结构耐久性问题.为此，必须找到一种耐腐蚀并且可以代替钢筋作用的材料.纤维增强复合……