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建立可靠的力学模型,使其能模拟循环荷载作用下足尺T型节点的全过程弯矩-转角曲线。由于螺栓之间相互作用且对连接的转动刚度有影响,螺栓连接的性能很复杂。将节点模型设计为由各个T型组件组成,并用线性弹簧模拟各组件。通过从荷载-位移反应机制得出的多线性刚度模型,分析组件的性能,包括受拉螺栓隆起、T型翼缘的弯曲、T型腹板的拉伸、相对滑移变形、允许变形等。将这些属性代入节点单元中的弹簧,能较准确地分析足尺节点性能。基于基本弹簧理论,集中阐述刚度模型,更好地分析了螺栓连接的性能、失效模型及T型组件韧性。
A reliable mechanical model is established to simulate the whole process of moment-rotation curve of full-scale T-joints under cyclic loading. Due to the interaction between the bolts and the rotational stiffness of the connection has an impact, the performance of the bolt connection is very complicated. The node model is designed to consist of individual T-shaped components and each component is modeled by a linear spring. The multi-linear stiffness model derived from the load-displacement reaction mechanism is used to analyze the performance of the components, including tension bolt tension, T-shaped flange bending, T-web tensile, relative slip deformation, allow deformation and so on. By substituting these properties into the springs in the node cell, the full node performance can be analyzed more accurately. Based on the basic spring theory, the stiffness model is elaborated to better analyze the performance of the bolted joint, the failure model and the toughness of the T-component.