Reinforcement Stability and Fracture of Cover Concrete in Reinforced Concrete Members
Reinforcement Stability and Fracture of Cover Concrete in Reinforced Concrete Members
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DOI：
10.1061/(asce)0733-9445(2002)128:10(1253
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发表时间：
2002-10
期刊：
影响因子：
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通讯作者：
R. Dhakal;K. Maekawa
中科院分区：
文献类型：
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作者：
R. Dhakal;K. Maekawa
本研究的主要目的是提出一个简单可靠的方法来预测纵向钢筋的屈曲长度，也预测在钢筋混凝土构件中的保护混凝土的剥落。稳定性分析进行适当考虑的几何和力学性能的纵向钢筋和横向拉杆。根据能量原理推导出在不同屈曲模式下拉住纵向钢筋所需的拉结刚度，并与实际拉结刚度进行比较，确定稳定屈曲模式。屈曲长度计算为稳定屈曲模式和系杆间距的乘积。所提出的屈曲长度确定方法的实验验证了各种情况下。还推荐了一种避免屈曲引起的强度退化的横向拉杆设计方法。对纵筋横向变形的影响进行了定量评价，并将其纳入了保护层混凝土空间的模拟计算中。
The main aim of this study is to propose a simple and reliable method to predict the buckling length of longitudinal reinforcing bars and also to predict the spalling of cover concrete in reinforced concrete members. Stability analysis is conducted giving due consideration to both geometrical and mechanical properties of the longitudinal reinforcing bars and lateral ties. The tie stiffness required to hold longitudinal reinforcing bars in different buckling modes is derived from energy principles, and it is compared with actual tie stiffness to determine the stable buckling mode. The buckling length is computed as the product of the stable buckling mode and the tie spacing. The proposed buckling length determination method is experimentally verified for various cases. A design method for lateral ties to avoid buckling-induced strength degradation is also recommended. The effect of lateral deformation of longitudinal bars is quantitatively evaluated and incorporated in the simulation of cover concrete spal...