Advances in Civil Structures IV by Chaohe Che, Guangfan Li, Qizhong Shen, Bifeng Jiang

By Chaohe Che, Guangfan Li, Qizhong Shen, Bifeng Jiang

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According to the calculating theory of bending member, three beams are all under-reinforced beams. This is because that the beam span is small and larger reinforcements will induce shear failure of the beam. Summary (1) Damage evolution model of RPC is proposed based on Weibull distribution, and then is transformed into stress-strain curve according to the definition of damage index. (2) Built up the damaged plasticity model of RPC in ABAQUS, and apply the proposed model on the compression member.

The modern nonlinear finite element method takes the plastic properties of structure into account. Chen S C [3] put forward a plastic method to analysis the spatial beam element in nonlinear finite element analysis method. ManSoo Joun [4] present a method for acquiring true stress-strain curves over large range of strains using engineering stress-strain curves obtained from a tensile test coupled with a finite element analysis. A beam element with a meshed section based on distributed plasticity and flexibility theory is presented for the material nonlinear finite element analysis of a reinforced concrete framed structure by Zhou Lingyuan and Li Qiao [5]; Zhu Jiejiang [6] proposed an efficient nonlinear reinforced concrete bar element to reduce the degrees of freedom and improve the accuracy of calculation.

About the determination of boundary condition, six degrees of freedom shall be constrained for the column base, the horizontal displacements Dx and Dy along the side length 22 Advances in Civil Structures IV direction as well as the turnings Ry and Rz shall be constrained for the column top, and the horizontal displacements Dx and Dy as well as the turnings Rx and Ry shall be constrained for the beam end. By taking Node 1 as an example, figure 4 shows the principal compressive stress of the node, figure 5 is the principal tensile stress of the node, figure 6 presents the equivalent plastic strain nephogram of concrete PEEQ, and figure 7 displays the mises stress nephogram of node steel reinforced ribs.

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