## 4 Design Considerations and Implementation Challenges
### Code Provisions and Design Guidelines  
The integration of additional damping systems into structural designs to enhance seismic resilience has led to the development of comprehensive code provisions and design guidelines. These regulatory frameworks aim to ensure the safe and effective incorporation of damping devices within building structures, while also providing engineers with standardized methodologies for analysis and design. A pivotal advancement in the formal recognition of supplementary damping systems is attributed to the research conducted by [PERSON] et al. [142]. Their significant study laid the groundwork for many subsequent code provisions, underscoring the importance of implementing performance-based design approaches when incorporating damping devices. Building on this foundation, the American Society of Civil Engineers (ASCE) [143] has made notable advancements in the integration of damping system design guidelines within its seismic design standards. [PERSON] and [PERSON] [144] indicate that the ASCE 7 standard [143], which enjoys widespread adoption across the United States, now encompasses comprehensive provisions for the analysis and design of structures equipped with damping systems. These provisions address various elements, such as the selection of suitable damper types, the calculation of damping coefficients, and the assessment of structural performance in response to varying seismic hazard levels. In Europe, significant updates to Eurocode 8 have been implemented to reflect the growing incorporation of supplementary damping systems. The Japanese building code is distinguished by its advanced seismic design regulations and has emerged as a pioneer in the incorporation of standards for damping systems. [PERSON] and [PERSON] [144] observed that this code provides comprehensive methodologies for the design of structures that utilize various types of dampers, including viscous, viscoelastic, and hysteretic devices. Their research underscores the code's emphasis on the necessity of considering the non-linear characteristics of dampers within the larger framework of structural response analysis. A pivotal element addressed in contemporary code provisions is the imperative for performance verification of damping devices. [PERSON] and [PERSON] [145] noted that numerous codes now mandate rigorous testing of dampers under diverse loading scenarios to ascertain their efficacy and dependability. These testing protocols generally encompass cyclic loading assessments, evaluations of temperature sensitivity, and long-term performance analyses to address potential aging impacts. The incorporation of damping systems into performance-based seismic design frameworks has been a focal point of recent code advancements. A crucial aspect emphasized in contemporary design standards is the recognition of uncertainties associated with damper characteristics and seismic forces. [PERSON] et al. [146] noted that the implementation of probabilistic approaches is becoming more prevalent within regulatory frameworks, enabling a more thorough assessment of structural reliability in the context of damping systems. These approaches frequently employ fragility curves and reliability indices to evaluate the likelihood of meeting specified performance objectives. The incorporation of damping systems in high-rise buildings and long-span structures has presented unique challenges that have been addressed in recent updates to codes. [PERSON] and [PERSON] [147] highlighted that many guidelines now include specific provisions for the design of dampers in skyscrapers, taking into account the effects of higher modes and wind-induced vibrations. Their findings emphasize the importance of considering multiple hazards during the design process, a concept that is increasingly reflected in modern building regulations. The field of supplementary damping is currently witnessing significant progress, which is anticipated to result in further improvements in code regulations and design standards. Recent findings by [PERSON] et al.