Analysis of the Application of Combined Damping Technique in Ensuring the Normal Use of Steel Structure Hospital Under Moderate Earthquakes

In consideration of the requirements for "normal use", the Aseismic Technical Guidelines Based on Maintaining the Normal Use Function of Buildings (RISN-TG046—2023) incorporates control requirements for "floor horizontal acceleration" by incorporating calculations of conventional structural deformation and component bearing capacity. With advancements in energy dissipation and damping technology, commonly used damping products in engineering primarily consist of displacement-type dampers and velocity-type dampers. These different damper types possess distinct technical principles and product performance characteristics. Currently, single-type damping products are predominantly utilized in practical engineering; however, they have certain limitations and deficiencies when it comes to comprehensive index control over structural deformation, component bearing capacity, and floor horizontal acceleration. To address this issue under the new requirement for "normal use," an organic combination of displacement type and velocity type damping products was proposed. The floor horizontal acceleration should not exceed 0.25g during moderate earthquakes or 0.45g during rarely occurred earthquakes, except for the roof panel; furthermore, only a small number of members within the combined damping scheme were hinged under rarely occurred earthquakes and not hinged under moderate earthquakes in structural damage analysis with a depth not exceeding the "IO state". Comparative results across various indicators demonstrated that the combined damping scheme effectively enhanced and controlled structural responses while outperforming single damping schemes, thereby achieving the goal of normal use during moderate earthquakes.