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从球体钢材屈服强度的角度对受压破坏机理进行研究。采用弹塑性线性强化材料本构模型建立有限模型,考虑几何非线性,利用弧长法对受压球节点进行了全过程受力分析。系统研究了受压球节点的承载能力和破坏机理,节点因材料屈服形成塑性环铰而无法继续承载,材料屈服强度是影响承载力的主要因素。提出了破坏控制截面的概念,剪应力是破坏截面的控制应力。采用Q235B和Q345B材质的4组8个典型球节点试件的对比性破坏试验研究,直观了解节点的受力性能和破坏机理,验证了有限元分析的正确性。最后,利用冲切模型对受压承载力进行了理论分析,建立了承载力实用计算公式,可以直接应用于工程设计。
The mechanism of compression failure is studied from the perspective of the yield strength of spherical steel. The finite element model was established by using the constitutive model of elastic-plastic linear strengthening material. The geometrical nonlinearity was considered and the stress analysis of the pressed ball joint was carried out by arc-length method. The bearing capacity and failure mechanism of the compression ball joints are studied systematically. The joints can not be carried by the plastic hinges due to material yielding. The yield strength of the material is the main factor that affects the bearing capacity. The concept of failure control section is proposed, and the shear stress is the control stress of the failure section. The comparative tests of four groups of eight typical ball joints with Q235B and Q345B materials were carried out to investigate the mechanical behavior and failure mechanism of the joints. The correctness of the finite element analysis was verified. Finally, using the punching model to carry out the theoretical analysis of the compressive bearing capacity, established a practical calculation formula of bearing capacity, which can be directly applied to engineering design.