高强度钢蜂窝梁抗弯承载能力有限元分析
Finite Element Analysis of Flexural Capacity of High-Strength Steel Castellated Beams

为研究纯弯作用下开孔率、开孔形式、钢材屈服强度对高强度钢蜂窝梁破坏形式及抗弯承载能力的影响规律，本文运用ABAQUS有限元软件建立普通钢蜂窝梁数值模型，通过文献中的试验验证模型的可靠性。在此基础上，研究了四点加载作用下各参数对高强度钢蜂窝梁破坏形式、屈服荷载及峰值荷载的影响。腹板削弱程度(开孔率及孔形)对纯弯作用下高强度钢蜂窝梁的破坏形式有着重要影响，钢材屈服强度是影响高强度钢蜂窝梁抗弯承载能力的主要影响因素，采用屈服强度为690 MPa钢材的蜂窝梁相比于屈服强度为460 MPa钢材的蜂窝梁，极限抗弯承载力可提高41%。然而，随着钢材强度的提升，蜂窝梁的延性明显下降，因此建议相关设计时，蜂窝梁的开孔率最佳值为55%，钢材的屈服强度最佳值为550 MPa。
In order to study the effects of open porosity, open porosity and steel yield strength on the failure form and bending bearing capacity of high-strength steel castellated beams under pure bending, a numerical model of ordinary steel castellated beams was established by using ABAQUS finite element software, and the reliability of the model was verified by tests in the literature. On this basis, the influences of the parameters under four-point loading on failure forms, yield loads and peak loads of high-strength steel castellated beams are studied. The degree of web weakening (opening rate and shape) has an important effect on the failure form of high-strength steel castellated beams under pure bending. The yield strength of steel is the main factor affecting the flexural capacity of high-strength steel castellated beams. Compared with the castellated beam with the yield strength of 460 MPa, the steel castellated beam with the yield strength of 690 MPa is adopted. The ultimate flexural capacity can be increased by 41%. However, with the increase in steel strength, the ductility of castellated beams decreases significantly. Therefore, it is recommended that the optimum value of castellated beams opening rate is 55%, and the optimum value of steel yield strength is 550 MPa.