摘要
本文介绍了一种计算钢筋混凝土/ECC叠合梁受弯起裂荷载的新方法。即按照弹性力学方法,以混凝土材料为等效基体,将钢筋混凝土/ECC叠合梁截面上等高度处的钢筋和ECC按弹模比进行折算,得到等效的匀质弹性截面。在此基础上,利用静矩公式求得等效截面的中和轴高度和惯性矩,并参照混凝土结构设计规范,考虑ECC受拉时的应变硬化特性,对截面抵抗矩塑性影响系数进行了相应修正,最后得出钢筋混凝土/ECC叠合梁正截面受弯情况下起裂荷载的计算公式。将本理论推导得出的计算结果与相关文献结果和课题组的试验结果进行比对,发现均能很好地吻合。
This paper reports a new calculation method for the cracking load of steel reinforced concrete/ECC composite beams. Based on the elasticity mechanicsand according to the elastic modulus ratio, steel and ECC were converted into concrete based section, by which composite beam has been equivalented into homogeneous elastic section. After that, the equivalent section＇ s neutral axis and inertia moment could be calculated with the formula of static moment. Finally, after taking reference to the concrete structure design code and considering the strain hardening behavior of ECC, plastic influence coefficient of sectional resistance moment has been revised and thus results to the formula for the composite beams. Comparison between the calculated and experimented results confirmed the feasibility of the formula.
作者
高淑玲
郭亚栋
吴耀泉
GAO Shu-linga GUO ya-dongb WU Yao-quanb(a. School of Civil and Transportation Engineerin b. Civil Engineering Technology Research Center of Hebei Province, Hebei University of Technology, Tianjin 300401, Chin)
出处
《土木工程与管理学报》
北大核心
2017年第4期14-18,共5页
Journal of Civil Engineering and Management
基金
国家自然科学基金(51108151)
关键词
叠合梁
正截面受弯
弹模比
起裂荷载
composite beams
normal section bending
elastic modulus ratio
craking load
