New precast frame industrial structures are seismically designed according to reliable modern criteria. However, most of the existing built stock hosting many workers and both regular and strategic industrial activities was designed and detailed neglecting the earthquake load or according to outdated seismic design criteria and regulations. Its seismic retrofit is a main challenge for the Engineering Community and a critical objective for institutional and private bodies. Among the envisaged solutions, the introduction of dissipative braces appears to be promising, although mostly inapplicable for these buildings, due to the brace lengths required by their typical large dimensions and the related proportioning against buckling. In this paper, an innovative seismic retrofitting technique based on monolateral dissipative bracing is investigated. The device proposed in this paper, yet in phase of preliminary design and testing, dissipates energy through friction in tension only while freely deforming in compression, which makes the issue related to compressive buckling irrelevant. A numerical analysis is carried out to investigate the efficiency of the proposed device in seismic retrofitting of precast industrial frame buildings with the aim to explore its feasibility and to better orient the definition of the slip threshold load range and the future development of the physical device. The simplified Capacity Spectrum Method (CSM) is employed for the global framing of the structural behaviour of the highly nonlinear retrofitted structures under seismic actions. A numerical tool is set to automatically apply the CSM based on the definition of few main parameters governing the seismic response of precast frame structures. The efficacy of the CSM is critically analysed through the comparison with the results of a set of nonlinear dynamic analyses. A smart simplified design process aimed at framing the most efficient threshold slip/yield load of the device given an existing structural configuration is presented with the application of the CSM through the identification of the most efficient performance indicator related to either displacement, shear force, equivalent dissipation of energy or a combination of them.

新的预制框架工业结构根据可靠的现代标准进行抗震设计。然而，大多数现有建筑存量容纳许多工人以及常规和战略性工业活动，其设计和细节忽略了地震荷载或根据过时的抗震设计标准和规定。其抗震改造是工程界的主要挑战，也是机构和私人团体的关键目标。在设想的解决方案中，引入耗散支撑似乎是有希望的，尽管大多数不适用于这些建筑物，因为它们典型的大尺寸和相关的抗屈曲比例要求支撑长度。在本文中，研究了一种基于单侧耗散支撑的创新抗震改造技术。本文中提出的装置处于初步设计和测试阶段，仅在压缩时自由变形时通过拉伸摩擦耗散能量，这使得与压缩屈曲相关的问题无关紧要。进行数值分析以研究所提出的装置在预制工业框架建筑抗震改造中的效率，旨在探索其可行性并更好地确定滑动阈值载荷范围的定义和物理装置的未来发展。使用简化的容量谱方法 (CSM) 对地震作用下高度非线性的改造结构的结构行为进行全局框架。根据控制预制框架结构地震响应的几个主要参数的定义，数值工具被设置为自动应用 CSM。通过与一组非线性动态分析的结果进行比较，批判性地分析了 CSM 的功效。通过识别与位移、剪切力或等效的最有效的性能指标相关的 CSM 的应用，提出了一种智能的简化设计过程，旨在确定给定现有结构配置的设备最有效的阈值滑移/屈服载荷能量耗散或它们的组合。