Finite element analysis of shear critical prestressed SFRC beams
Finite element analysis of shear critical prestressed SFRC beams
复制标题
剪切临界预应力钢纤维混凝土梁的有限元分析
DOI：
10.12989/cac.2006.3.1.065
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
A. Ramaswamy
中科院分区：
文献类型：
--
作者：
Job Thomas;A. Ramaswamy
本研究报告的细节，11剪切临界部分预应力混凝土T梁的钢纤维在部分或全部深度的有限元分析。本文用ANSYS对剪跨比为2.65和1.59的预应力混凝土T梁进行了分析。“ANSYS”模型考虑了纵向钢筋的粘结滑移、混凝土开裂后的抗拉刚度、混凝土开裂块的应力传递以及通过裂缝界面处钢纤维的桥接来承载等非线性现象。混凝土采用SOLID65八节点砖单元模拟，该单元能够模拟脆性材料的开裂和压碎行为。采用“LINK8”三维杆单元对钢筋、预应力钢丝和钢纤维等进行离散化模拟。钢筋（钢筋、纤维）和混凝土之间的滑移已经使用“COMBIN39”非线性弹簧单元建模，该单元连接代表钢筋的“LINK8”单元的节点和代表混凝土的“SOLID65”单元的节点。“ANSYS”模型正确预测了试验中观察到的预应力混凝土梁的斜拉破坏和剪压破坏。文中还举例说明了该模型对预应力混凝土梁各种剪切破坏形式的临界裂缝区、荷载和挠度的捕捉能力。
This study reports the details of the finite element analysis of eleven shear critical partially prestressed concrete T-beams having steel fibers over partial or full depth. Prestressed concrete T-beams having a shear span to depth ratio of 2.65 and 1.59 and failing in the shear have been analyzed Using 'ANSYS'. The 'ANSYS' model accounts for the nonlinear phenomenon, such as, bond-slip of longitudinal reinforcements, post-cracking tensile stiffness of the concrete, stress transfer across the cracked blocks of the concrete and load sustenance through the bridging of steel fibers at crack interlace. The concrete is modeled using 'SOLID65'-eight-node brick element, which is capable Of simulating the cracking and crushing behavior of brittle materials. The reinforcements such as deformed bars, prestressing wires and steel fibers have been modeled discretely Using 'LINK8' - 3D spar element. The slip between the reinforcement (rebar, fibers) and the concrete has been modeled using a 'COMBIN39'-non-linear spring element connecting the nodes of the 'LINK8' element representing the reinforcement and nodes of the 'SOLID65' elements representing the concrete. The 'ANSYS' model correctly predicted the diagonal tension failure and shear compression failure of prestressed concrete beams observed in the experiment. I-lie capability of the model to capture the critical crack regions, loads and deflections for various types Of shear failures ill prestressed concrete beam has been illustrated.