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确定钢横断面抵抗力的塑性准则常基于一些基本假设,例如,取决于内力和截面形状相互作用的塑性铰的发展,因此,需要对每种截面形式提出相应的特定方程。该文提出新的相互作用准则分析轴力或双向弯曲下工字钢的弹性和塑性极限状态(不包括屈曲现象)。首先,针对一些特殊的内力组合(例如:单向弯矩-轴力组合和双向弯矩),给出相应的塑性相互作用准则。这二种情况都给出了精确的计算公式(包含采用该研究假设的框架),将所有塑性相互作用准则与EC3中相应的塑性准则进行比较。然后,提出适用于轴力和双向弯曲共同作用时的简化且总的准则。新的简化的塑性准则及EC3中采用的相应的塑性准则与精确的数值解相比较,结果显示,简易塑性准则的计算结果较为精确。对EC3提出改进建议。
Plasticity criteria for determining the resistance of a steel cross-section are often based on some basic assumptions, for example, the development of plastic hinges that depend on the interaction of internal forces and cross-sectional shapes. Therefore, it is necessary to propose corresponding specific equations for each cross-sectional form. In this paper, a new interaction criterion is proposed to analyze the elastic and plastic limit states (excluding buckling) of an I-beam under axial or two-way bending. First of all, for some special internal force combinations (such as unidirectional moment-axial force combination and two-way bending moment), the corresponding plastic interaction criterion is given. In either case, an accurate calculation is given (including the framework that assumes the research hypothesis) and all plasticity interaction criteria are compared with the corresponding plasticity criteria in EC3. Then, a simplified and general guideline is proposed for the joint action of axial force and two-way bending. The new simplified plasticity criterion and the corresponding plasticity criterion adopted in EC3 are compared with the exact numerical solution. The results show that the simple plasticity criterion is more accurate. Suggest improvements to EC3.