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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Developing high-performance aluminum alloy buckling-restrained braces based on series of low-cycle fatigue tests
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Developing high-performance aluminum alloy buckling-restrained braces based on series of low-cycle fatigue tests

机译：基于一系列低循环疲劳试验开发高性能铝合金屈曲约束牙套

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In order to enhance the durability of high-performance buckling-restrained braces (BRBs) used in bridge engineering, which are expected to withstand severe earthquakes three times without being replaced, aluminum alloys were employed to manufacture BRBs. A series of low-cycle fatigue tests, including 18 specimens, were conducted to address the low-cycle fatigue strength of the aluminum alloy BRB. Test results of all specimens show that stable hysteretic curves were obtained without overall buckling occurrence. Failure mode of the welded aluminum alloy BRB is obviously affected by the ribs' welding under the variable or constant strain amplitude condition. Therefore, another type of aluminum alloy BRB, the bolt-assembled BRB with or without spot-welded stoppers, is proposed and tested. Results showed that the low-cycle fatigue performance of bolt-assembled BRBs with stoppers improved four to five times compared with welded BRBs. However, the stoppers' spot welding has an adverse effect on the failure mode because the crack, which induced the specimen's failure, initiated from the spot weld toes of the stoppers. Both bolt-assembled BRBs with and without stoppers can meet the cumulative inelastic deformation requirement proposed for high-performance BRBs under the constant strain amplitude, not larger than 2%. In addition, under the variable strain amplitude condition, only the bolt-assembled BRB without stoppers has an excellent cumulative inelastic deformation capacity and sustains two cycles of 2.5% strain amplitude. Finally, recommended Manson-Coffin equations and preliminary cumulative damage formulae for welded and bolt-assembled BRBs are given as the references of the strain-based damage evaluation.
机译：为了增强桥梁工程中使用的高性能屈曲约束支撑（BRB）的耐用性，这些支撑有望在不更换的情况下承受三倍的强烈地震，因此采用铝合金制造了BRB。为了解决铝合金BRB的低周疲劳强度，进行了一系列低周疲劳测试，包括18个样品。所有样品的测试结果表明，获得了稳定的磁滞曲线，而没有整体屈曲发生。在可变或恒定应变幅度条件下，焊接铝合金BRB的失效模式明显受肋的焊接影响。因此，提出并测试了另一种铝合金BRB，即带有或不带有点焊塞的螺栓装配式BRB。结果表明，与焊接的BRB相比，带塞的螺栓组装BRB的低周疲劳性能提高了四到五倍。但是，塞子的点焊对失效模式有不利影响，因为导致样品失效的裂纹是从塞子的点焊趾开始的。螺栓组装的BRB带有和不带有塞子都可以满足在恒定应变幅度（不大于2％）下高性能BRB提出的累积非弹性变形要求。另外，在可变应变振幅条件下，仅螺栓组装的不带挡块的BRB具有极好的累积非弹性变形能力，并维持两个2.5％应变振幅的循环。最后，给出了推荐的Manson-Coffin方程和焊接和螺栓装配的BRB的初步累积损伤公式，作为基于应变的损伤评估的参考。

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