Abstract

To explore the effect of design parameters on the mechanical performance of the proposed all-steel buckling-restrained brace (BRB), the finite element software ABAQUS is adopted. The brace consists of an inner round steel tube and an outer square steel tube to restrain its inner core, designed with both the cruciform-section core and the H-section steel core. Quasi-static tests are performed on the all-steel BRB to explore its energy dissipation capacity. The cyclic behavior of the specimen models is evaluated. The validity of the numerical model is verified by comparing the predicted results with the experimental results. Next, the effects of three parameters on the mechanical properties of the brace—the width-thickness ratio of the inner core, the clearance between the inner core and the inner round steel tube c1, and the constraint ratio—are investigated by the validated numerical model. The width-thickness ratio varies from 6 to 20, the gap value ranges from 1 to 7 mm, and the constraint ratio ranges from 0.43 to 1.03. Results show that the hysteresis curves of the two braces are full, with stable hysteretic performance and good energy dissipation capacity, which justifies the construction. Based on the parameters analysis results, the optimum values of the width-thickness ratio, gap, and constraint ratio have been recommended for steel BRBs.

摘要

为了探讨设计参数对所提出的全钢屈曲约束支撑 (BRB) 力学性能的影响，采用了有限元软件 ABAQUS。支撑由内圆钢管和外方钢管约束其内芯，采用十字型钢芯和H型钢芯设计。对全钢 BRB 进行了准静态试验，以探索其耗能能力。评估样本模型的循环行为。通过将预测结果与实验结果进行比较，验证了数值模型的有效性。接下来，三个参数对支撑力学性能的影响——内芯宽厚比、内芯与内圆钢管的间隙c1、和约束比——通过验证的数值模型进行研究。宽厚比从6到20不等，间隙值从1到7毫米不等，约束比从0.43到1.03不等。结果表明，两种支撑的滞回曲线饱满，滞回性能稳定，耗能能力好，施工合理。根据参数分析结果，推荐了钢制BRB的宽厚比、间隙和约束比的最佳值。这证明了建设。根据参数分析结果，推荐了钢制BRB的宽厚比、间隙和约束比的最佳值。这证明了建设。根据参数分析结果，推荐了钢制BRB的宽厚比、间隙和约束比的最佳值。