等效线性化方法在自复位防屈曲支撑结构中的应用

发布时间：2019-04-26 00:34

【摘要】：自复位防屈曲支撑(SCBRB)由复位系统和耗能内芯组成,由于其综合了自复位体系和防屈曲支撑的优点,经过合理设计可兼具良好的复位及耗能能力,因此更有利于实现可恢复的结构这一抗震目标。若主体结构保持弹性,则自复位防屈曲支撑框架(SCBRBF)的简化恢复力模型为双线性弹性+双线性弹塑性合成的三线性滞回模型。等效线性化方法的精度对于等效阻尼比和等效刚度的计算方式比较敏感,不同的恢复力模型以相同的等效线性化方法计算精度也不相同,因此应根据具体情况对结果进行修正,以提高计算精度和结构的安全性。首先,分别对两种等效线性化方法计算自复位防屈曲支撑结构地震位移的平均误差及变异系数展开了参数研究。结果表明:由于SCBRBF的非线性和塑性程度均低于理想弹塑性结构,因此与理想弹塑性结构相比,用两种等效线性化方法评估自复位结构地震位移反应时,尤其在周期大于0.3 s时,精度显著提高;等概率幅值平均等效线性化方法由于考虑了所有位移对等效阻尼比和等效刚度的贡献,因此比割线刚度法更为精确。其次,根据分析结果给出了不同等效线性化方法在计算SCBRBF时的修正系数。最后,根据阻尼比函数得到各个参数对阻尼比的影响规律,并给出最佳延性比。
[Abstract]:The self-reset buckling-proof bracing (SCBRB) is composed of a reduction system and an energy dissipation inner core. Due to the combination of the advantages of the self-reduction system and the buckling-proof bracing, the self-reset buckling-proof bracing has good reduction and energy dissipation capacity through reasonable design. Therefore, it is more beneficial to realize the seismic goal of recoverable structure. If the main structure remains elastic, then the simplified restoring force model of the self-reset buckling-proof braced frame (SCBRBF) is a trilinear hysteretic model with bilinear elastic bilinear elasto-plastic composition. The accuracy of equivalent linearization method is sensitive to the calculation method of equivalent damping ratio and equivalent stiffness, and the accuracy of different restoring force models is also different with the same equivalent linearization method. Therefore, the results should be modified according to the specific situation. In order to improve the accuracy of calculation and the safety of the structure. Firstly, two equivalent linearization methods are used to calculate the average error and coefficient of variation of earthquake displacement of self-reset buckling-proof bracing structure. The results show that because the degree of nonlinearity and plasticity of SCBRBF is lower than that of ideal elasto-plastic structure, the seismic displacement response of self-reset structure is evaluated by two equivalent linearization methods compared with ideal elasto-plastic structure. Especially when the period is more than 0.3 s, the precision is improved significantly. The equal probability amplitude average equivalent linearization method is more accurate than the Secant stiffness method because it considers the contribution of all displacements to the equivalent damping ratio and the equivalent stiffness. Secondly, based on the analysis results, the correction coefficients of different equivalent linearization methods for calculating SCBRBF are given. Finally, according to the damping ratio function, the influence of each parameter on the damping ratio is obtained, and the optimum ductility ratio is given.
【作者单位】：哈尔滨工业大学(威海)土木工程系;哈尔滨工业大学土木工程学院;
【基金】：国家自然科学基金项目(51308169) 哈尔滨工业大学科研创新基金项目(HIT.NSRIF.2015120) 住房城乡建设部科学技术项目计划(2015k2-025) 山东省蓝色经济区工程建设与安全协同创新中心项目
【分类号】：TU352.11

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