A novel low‐cost friction sliding system for bidirectional excitation is developed to improve the seismic performance of reinforced concrete (RC) bridge piers. The sliding system is a spherical prototype developed by combining a central flat surface with an inclined spherical segment, characterized by stable oscillation and a large reduction in response accelerations on the flat surface. The inclined part provides a restoring force that limits the residual displacements of the system. Conventional steel and concrete are employed to construct a flat‐inclined spherical surface atop an RC pier. The seismic forces are dissipated through the frictions generated during the sliding movements; hence, the seismic resilience of bridges can be ensured with a low‐cost design solution. The proposed system is fabricated utilizing a mold created by a three‐dimensional printer, which facilitates the use of conventional concrete to construct spherical shapes. The concrete surface is lubricated with a resin material to prevent abrasion from multiple input ground motions. To demonstrate the effectiveness of the system, bidirectional shaking table tests are conducted in the longitudinal and transverse directions of a scaled bridge model. The effect of the inclination angle and the flat surface size is investigated. The results demonstrate a large decrease in response acceleration when the system exhibits circular sliding displacement. Furthermore, the inclination angle that generates the smallest residual displacement is identified experimentally.

中文翻译：

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具有平面倾斜表面的低成本摩擦滑动系统的双向振动台测试

开发了一种新型的双向激励低成本摩擦滑动系统，以改善钢筋混凝土（RC）桥墩的抗震性能。滑动系统是通过将中央平面与倾斜的球形段相结合而开发的球形原型，其特征在于稳定的振荡和对平面上响应加速度的大幅降低。倾斜部分提供了恢复力，该恢复力限制了系统的剩余位移。使用常规的钢和混凝土在RC墩顶上构造一个倾斜的球形表面。通过滑动过程中产生的摩擦力消散了地震力。因此，可以通过低成本的设计解决方案来确保桥梁的抗震能力。所提出的系统是利用三维打印机创建的模具制造的，这有利于使用常规混凝土构造球形。混凝土表面用树脂材料润滑，以防止多次输入地面运动引起的磨损。为了证明该系统的有效性，在伸缩桥模型的纵向和横向上进行了双向振动台测试。研究了倾斜角和平面尺寸的影响。结果表明，当系统呈现圆形滑动位移时，响应加速度将大大降低。此外，通过实验确定了产生最小残余位移的倾斜角。这有助于使用常规混凝土构造球形。混凝土表面用树脂材料润滑，以防止多次输入地面运动引起的磨损。为了证明该系统的有效性，在伸缩桥模型的纵向和横向上进行了双向振动台测试。研究了倾斜角和平面尺寸的影响。结果表明，当系统呈现圆形滑动位移时，响应加速度将大大降低。此外，通过实验确定了产生最小残余位移的倾斜角。这有助于使用常规混凝土构造球形。混凝土表面用树脂材料润滑，以防止多次输入地面运动引起的磨损。为了证明该系统的有效性，在伸缩桥模型的纵向和横向上进行了双向振动台测试。研究了倾斜角和平面尺寸的影响。结果表明，当系统呈现圆形滑动位移时，响应加速度将大大降低。此外，通过实验确定了产生最小残余位移的倾斜角。双向振动台测试是在比例桥模型的纵向和横向上进行的。研究了倾斜角和平面尺寸的影响。结果表明，当系统呈现圆形滑动位移时，响应加速度将大大降低。此外，通过实验确定了产生最小残余位移的倾斜角。双向振动台测试是在比例桥模型的纵向和横向上进行的。研究了倾角和平面尺寸的影响。结果表明，当系统呈现圆形滑动位移时，响应加速度将大大降低。此外，通过实验确定了产生最小残余位移的倾斜角。