ABSTRACT

Previous researchers have extended the direct displacement-based design (DDBD) procedure, to design reinforced concrete moment-resisting frame (RC-MRF) buildings with linear viscous dampers (LVDs). In those studies, the viscous damper forces are found to be larger than the design viscous damper forces because the actual relative structural velocity is different from the pseudo-velocity and also due to higher-mode effects. In the present study, a damper velocity correction factor is introduced along the height of the RC-MRF with LVDs, to calculate the corrected velocity of the LVD from the design velocity of the LVD, when the DDBD procedure is used. The damper velocity correction factor is proposed using the results of nonlinear response history analysis (NLRHA) for a set of RC-MRFs with LVDs, which are designed using the DDBD procedure. The DDBD procedure is then used to design RC-MRFs with nonlinear viscous dampers (NLVDs) making use of the proposed damper velocity correction factor, by calculating the NLVD characteristics using the equal energy (EE) dissipation approach or the equal power (EP) consumption approach. The accuracy of the proposed damper velocity correction factor is evaluated by carrying out NLRHA of two sets of RC-MRFs with NLVDs, one set where the damper velocity correction factor is not used, and the other set where it is used. When the damper velocity correction factor is used; the design LVD forces either agree with NLRHA results or are slightly more conservative, the design NLVD forces are close to the NLRHA results, and the maximum value of peak inter-story drift ratio (IDR) along the height of the RC-MRF from NLRHA is close to the design IDR limit. There is no significant difference in the peak story shear forces whether the damper velocity correction factor is used or not.

摘要

以前的研究人员已经扩展了基于直接位移的设计 (DDBD) 程序，以设计带有线性粘性阻尼器 (LVD) 的钢筋混凝土抗弯框架 (RC-MRF) 建筑物。在这些研究中，发现粘性阻尼力大于设计粘性阻尼力，因为实际的相对结构速度与伪速度不同，并且还由于高模态效应。在本研究中，当使用 DDBD 程序时，沿带有 LVD 的 RC-MRF 的高度引入阻尼器速度校正因子，以根据 LVD 的设计速度计算 LVD 的校正速度。使用 DDBD 程序设计的一组带有 LVD 的 RC-MRF 的非线性响应历史分析 (NLRHA) 的结果，提出了阻尼器速度校正因子。然后，通过使用等能量 (EE) 耗散方法或等功率 (EP) 消耗计算 NLVD 特性，使用所提出的阻尼器速度校正因子，使用 DDBD 程序设计具有非线性粘性阻尼器 (NLVD) 的 RC-MRF方法。通过对两组具有 NLVD 的 RC-MRF 进行 NLRHA 评估所提出的阻尼器速度校正因子的准确性，其中一组未使用阻尼器速度校正因子，另一组使用它。使用阻尼器速度修正系数时；设计 LVD 力要么与 NLRHA 结果一致，要么稍微保守一些，设计 NLVD 力接近 NLRHA 结果，并且从 NLRHA 沿 RC-MRF 高度的峰值层间漂移比 (IDR) 的最大值接近设计 IDR 限制。