摘要
In order to improve the computation efficiency and simulation accuracy,a novel simplified simulation method for friction pendulum bearing( FPB) is proposed. The behavior of FPB was analyzed based on the stress characteristics of the slider of FPB. Then,a novel simplified FPB model with a single pendulum and a nonlinear spring was established. The mechanical behavior of the simplified model was analyzed and it conformed well to the basic requirements of FPB. Furthermore,shaking table tests of a concrete slab block structure isolated by four FPBs were carried out, followed by finite element simulations of the test using the proposed simplified model.Three waves and eleven loading scenarios were selected in the test. The results show that the overall trend of the relative displacement time-history curves,the horizontal acceleration time-history curves and the vertical acceleration time-history curves from the numerical simulation match in a good manner with those obtained from the tests. Specifically,it is found that the difference of the peak value within these curves between the simulation and test results is less than 15%,which means that the proposed simplified model can be used to simulate the FPB behaviors under dynamic loadings with acceptable accuracy for engineering purposes.
为了进一步提高摩擦摆支座(FPB)的计算效率和模拟精度,提出了一种新的简化模拟方法.首先,基于FPB滑块的受力特点,研究了FPB的力学机理,并由此提出了由一个单摆和一根非线性弹簧构成的FPB简化模型;然后,通过对FPB简化模型进行受力分析,验证了简化模型基本力学机理与FPB的一致性;最后,选取了3条地震波对一块使用4个FPB隔震的混凝土板进行11个工况的振动台试验,采用简化模型对试验过程进行有限元模拟,并将试验分析结果和有限元分析结果进行对比.结果表明:试验和模拟条件下的相对位移时程曲线、水平加速度时程曲线及竖向加速度时程曲线的整体趋势较为吻合,峰值处误差在15%之内.研究结果验证了所提FPB简化模型在动力荷载下模拟的准确性.
基金
The National Natural Science Foundation of China(No.6505000184)
the National Key Research and Development Program of China(No.2016YFC0701400)
