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为了研究冷弯薄壁型钢组合墙体的滞回性能,对4片3m×2.4m(高×宽)不同构造的冷弯薄壁型钢组合墙体足尺试件进行了拟静力试验。根据试验所得的滞回规律,采用Richard-Abbott曲线,建立了能反映其滞回曲线非线性、滑移捏缩、强度和刚度退化特征的三段式非线性滑移滞回模型,并在Origin8.0软件里辨识了各试件模型中的待定参数。研究结果表明:影响滞回曲线的主要因素为墙体先前经历的最大位移;典型捏缩滞回环的上升或下降段曲线可分为刚度单调变化的三段;用参数辨识结果得到的仿真滞回曲线与试验滞回曲线吻合较好,三段式非线性滑移滞回模型能较全面地反映冷弯薄壁型钢结构组合墙体的滞回特征、模型表达式直观、各参数物理意义明确且易于识别。
In order to study the hysteretic behavior of the cold-formed thin-walled steel composite wall, four pseudo-static tests were carried out on four full-size specimens of cold-formed thin-walled steel composite wall with a size of 3m × 2.4m (height × width). According to the hysteretic law obtained from the experiment, a three-stage nonlinear slipping hysteresis model is established by using the Richard-Abbott curve, which can reflect the nonlinear characteristics of hysteresis curve, slipping pinch, strength and stiffness. .0 software identifies the parameters to be determined in each specimen model. The results show that the main factor affecting the hysteresis curve is the maximum displacement experienced by the wall. The curves of the ascending or descending section of a typical pinched hysteretic loop can be divided into three sections with a monotonically changing stiffness. The simulation hysteresis The curve coincides well with the experimental hysteretic curve. The three-stage nonlinear slipping hysteretic model can more fully reflect the hysteretic characteristics of the cold-formed thin-walled steel composite wall, the model expression is intuitive, and the physical meaning of each parameter is clear Easy to identify.