Abstract This study evaluated innovated A-braced frame design performance under cyclic load and twelve far-field and near-field earthquake ground motions. The proposed A-brace design combined pre-deformed brace segments, steel curved damper and lever mechanism to amplify steel curved damper deformation for effective energy dissipation. A series of cyclic loading tests on steel moment resisting frames with the proposed A-braces were conducted first. The cyclic load test results showed that A-braced frames exhibited higher stiffness than the moment resisting frame in both elastic and inelastic stages to effectively reduce the structural deformation. Significant strength and energy dissipation enhancements were achieved in A-braced frames, with maximum gains reaching 2.31 and 1.94 times, respectively, above those of the moment resisting frame. Seismic performance evaluation on multi-story framed structures revealed that lower structural base shear, reduction in story drift, approximately 30.86%, 27.61% and 27.51% for the 10, 6 and 3-story frames, respectively, and plastic hinge development elimination to prevent structural failure were achieved simultaneously when the A-brace was adopted. The A-braced frame performance enhancements under cyclic load and various earthquake ground motions effectively justified proposed method applicability to seismic structural design.

中文翻译：

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钢制A型撑架提升各种载荷特性下的性能

摘要 本研究评估了在循环荷载和十二个远场和近场地震地面运动下创新的A型支撑框架设计性能。拟议的 A 形支撑设计结合了预变形的支撑段、钢弯曲阻尼器和杠杆机构，以放大钢弯曲阻尼器变形以有效耗散能量。首先对带有建议的 A 形支撑的钢抗弯框架进行了一系列循环载荷试验。循环荷载试验结果表明，A型支撑框架在弹性和非弹性阶段均表现出比抗弯框架更高的刚度，有效减少了结构变形。A型支撑框架实现了显着的强度和能量耗散增强，最大增益分别达到抗弯框架的2.31和1.94倍。多层框架结构抗震性能评估表明，10、6、3层框架结构基础剪力降低，层间位移减少，分别约为30.86%、27.61%和27.51%，消除塑性铰开发以防止当采用 A 形支撑时，同时实现了结构破坏。A 支撑框架在循环荷载和各种地震地面运动下的性能增强有效地证明了所提出的方法在抗震结构设计中的适用性。当采用 A 型支撑时，同时实现了消除塑性铰开发以防止结构失效。A 支撑框架在循环荷载和各种地震地面运动下的性能增强有效地证明了所提出的方法在抗震结构设计中的适用性。当采用 A 型支撑时，同时实现了消除塑性铰开发以防止结构失效。A 支撑框架在循环荷载和各种地震地面运动下的性能增强有效地证明了所提出的方法在抗震结构设计中的适用性。