Confined concrete model for columns under combined axial load and bending
Confined concrete model for columns under combined axial load and bending
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DOI：
10.1680/macr.11.00027
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发表时间：
2012-09
影响因子：
2.7
通讯作者：
Jong Yil Park;Young Hak Lee;A. Scanlon
中科院分区：
文献类型：
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作者：
Jong Yil Park;Young Hak Lee;A. Scanlon
对Mander的约束混凝土模型进行了修正，建立了约束混凝土应力-应变曲线模型，该模型是计算常轴压下柱弯矩-曲率关系的基础。对Mander模型中的两个主要假设（45 °拱作用和拉杆屈服）分别进行了弹性理论和应变协调理论的检验和修正。从所提出的约束混凝土模型中可以看出，虽然45 °拱作用假设似乎适合于约束效果，但系杆应力可能远小于屈服应力。利用所提出的混凝土模型编制了计算机程序，模拟了约束混凝土方柱在恒定轴压作用下的弯矩-曲率关系。通过与实验室试验结果的比较，验证了该模型的数值计算结果，并与试验结果吻合较好，特别是在弯矩-曲率关系的峰后部分。
A stress–strain curve model for confined concrete, which is essential for generating moment–curvature relationships for columns under constant axial loading, was developed by modifying Mander's confined concrete model. Two main assumptions adopted in Mander's model (45° arch action and yielding of tie bars) were tested and modified according to the theories of elasticity and strain compatibility, respectively. It was shown from the proposed confined concrete model that, although the 45° arch action assumption seems to be appropriate for confining effectiveness, tie bar stress may be far less than yield stress. A computer-based program was prepared to simulate moment–curvature relations of confined square concrete columns subjected to constant axial loading using the proposed concrete model. Numerical results from the proposed model were validated by comparing them with available laboratory test results; good agreement was found, especially in post-peak parts of moment–curvature relations.