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研究了铝合金槽型与加劲槽型截面轴心受压构件的有限元数值模拟及设计方法。采用ABAQUS建立了铝合金槽型和加劲槽型轴心受压构件的非线性数值模型,并基于28个试验结果的数值模拟验证了该模型可以准确地模拟铝合金轴心受压构件的力学性能。应用该模型对90个铝合金槽型与加劲槽型截面轴心受压构件进行数值计算。以试验和数值计算结果为基础,提出了适用于铝合金槽型和加劲槽型截面轴心受压构件的直接强度法设计公式,并与现行《铝合金结构设计规范》中承载力计算结果进行比较。由比较结果可以看出,《铝合金结构设计规范》计算此类截面的承载力较保守,在计算轴心受压构件稳定系数和截面非对称系数时采用不同的相对长细比,而提出的直接强度法计算结果较为精确。在此基础上对《铝合金结构设计规范》提出了修改意见,建议在计算时采用统一的相对长细比。通过可靠度分析,检验了各类型设计公式对于该类型构件的精确性。
The finite element numerical simulation and design method of aluminum alloy groove and stiffened channel section axial compression member were studied. A nonlinear numerical model of aluminum alloy slotted and stiffened axial compression members was established by ABAQUS. The numerical simulation of 28 experimental results verified that the model can accurately simulate the mechanical properties of aluminum alloy axial compression members . The model was used to calculate the axial compression members of 90 aluminum alloy groove and stiffened groove section. Based on the experimental results and the numerical results, the design method of direct strength method for axial compression members with grooved and stiffened cross-section of aluminum alloy is proposed and compared with the calculation results of the bearing capacity in the current code for design of aluminum alloy structures Compare From the comparison results, it can be seen that the bearing capacity of such section calculated by “Code for Design of Aluminum Alloy Structure” is relatively conservative, and different relative slenderness ratios are adopted when calculating the stability coefficient and cross-sectional asymmetry coefficient of the axial compression member The direct intensity method is more accurate. On this basis, proposed amendments to the “Code for Design of Aluminum Alloy Structure”, it is recommended to adopt a uniform relative slenderness ratio in the calculation. Through the reliability analysis, the accuracy of various types of design formulas for this type of component is tested.