分散式钢棒混凝土柱非线性数值模拟研究

 针对实腹式型钢混凝土柱施工难度大、造价高的特点，文中基于核心区钢骨含钢量相同的原则给出了一种低工程造价、低施工难度的分散式钢棒核心钢骨混凝土柱，初步试验已验证两种柱的力学性能相近，该论文则是更深入地研究这种新型截面柱的抗震性能。通过考虑材料本构关系的非线性以及P-Δ效应，应用有限元软件（ABAQUS）建立分散式钢棒核心钢骨混凝土柱的非线性有限元模型，开展轴压比、含钢率、混凝土强度以及核心钢棒屈服强度等对分散式钢棒核心钢骨混凝土柱荷载位移曲线、水平极限承载力及延性系数影响的研究，结果表明：分散式钢棒核心钢骨混凝土柱水平极限承载力受轴压比和混凝土强度的影响明显，而含钢率和核心钢棒屈服强度对水平极限承载力影响很小；延性系数是一个比较敏感的指标，受各种因素的影响均较明显。

Nonlinear Numerical Investigations on the Steel Reinforced Concrete of Distributed Steel Bar Core Section

Because of the SRC column are difficult to construct and the high cost, the new SRC cross section of distributed steel bar with low cost is proposed based on the principle of which the same core steel ratio.The two types columns has been validated similar mechanical properties by the preliminary tests, and more in depth study of the seismic performance of this new cross section column is presented. Considering the nonlinearity of the materials and the appearance of P-Δ, analysis models of SRC of distributed steel bar core section with FEMs software are built. Parameters of axial compression ratio, the core steel ratio, the strength of concrete and core steel bar which influence the P-Δ curves, horizontal ultimate load and ductility coefficients were analyzed for further study of the new SRC section. The conclusion is as follows: the horizontal ultimate load of new SRC cross section of distributed steel bar was obvious influenced by the axial compression ratio and strength of concrete and less affected by the core steel ratio and the strength of the core steel bar; ductility coefficients which was obvious influenced by many factors is a sensitive indicator.