Assessment of wind-induced vibration mitigation in a tall building with damped outriggers using real-time hybrid simulations

Damping Property of Cement Mortar Incorporating Damping Aggregate

“…While this conducive to improve the damping property of cement-based materials, it will be discussed in Section 3.3. The compressive strength of the cement mortar modified with 30% SEA was approximately increased by 3%, the slight increment in compressive strength of the styrene-acrylic ester modified the cement mortar mainly due to the porosity reduction and the internal curing role [30,31].…”

“…To obtain the acceleration response signals as time-magnitude graphs during the experiment ( Figure 5), Brüel & Kjaer's platform (PULSE Reflex Core, Bruel&Kjaer, Copenhagen, Denmark) for noise and vibration analysis was used [6]. The damping ratio of cement mortar was calculated by the half-power bandwidth method [30,31], as shown in Figure 6. It should be pointed out that the free vibration tests were repeated three times on each specimen, and the average was recorded from the successive results [9].…”

Mechanical and Damping Properties of Recycled Aggregate Concrete Modified with Air-Entraining Agent and Polypropylene Fiber

“…Studies have suggested that due to its high tensile strain, a fiber polymer, as an additive, can contribute to improving the performance of concrete [3,7,21,22]. Furthermore, the study of the effect of the type and dosage of fiber on the mechanical properties of RAC has shown that concrete reinforced with glass and steel fibers can significantly improve the mechanical performance of RAC when the fiber content is within a reasonable range [23].…”

NHERI Lehigh Experimental Facility With Large-Scale Multi-Directional Hybrid Simulation Testing Capabilities

“…(2) large-scale real-time hybrid simulation (RTHS), which is a HS conducted at the actual time scale of the physical models and excitations (Chen et al, 2009;Karavasilis et al, 2011;Chae et al, 2014;Dong et al, 2015); (3) large-scale real-time hybrid simulation with multiple experimental substructures, where several experimental specimens are used in an RTHS (Chen and Ricles, 2012;Al-Subaihawi et al, 2020); (4) geographically distributed hybrid simulation (DHS), which is an HS with physical models and/or numerical simulation models located in different laboratories and connected through the internet (Ricles et al, 2007); (5) geographically distributed real-time hybrid earthquake simulation (DRTHS), which combines DHS and RTHS (Kim et al, 2012); (6) dynamic testing (DT), which use high speed servo-controlled hydraulic actuators at real-time scales to impose predefined force or displacement histories (Ricles et al, 2002a;Chae et al, 2013b;Riggs et al, 2014); and (7) quasi-static testing (QS) of physical models using predefined force or displacement histories (Ricles et al, 2002b;Zhang and Ricles, 2006;Perez et al, 2013). A broad array of instrumentation, large-scale data acquisition systems, and advanced sensors is available to acquire the system-level data needed to support the goal of advancing computational modeling and simulation.…”

“…For the experimental substructure, an adaptive servo-hydraulic control law developed by the authors (Chae et al, 2013a), called the adaptive time series (ATS) compensator, is used to provide accurate servo-hydraulic actuator tracking capability. The algorithm and adaptive control scheme have been successfully implemented and used at Lehigh to conduct over 2000 RTHS on structures with elastomeric, viscous, and semi-active controlled dampers subjected to seismic (Chen et al, 2009;Karavasilis et al, 2012;Dong et al, 2016Dong et al, , 2018a and wind loadings (Al-Subaihawi et al, 2020;Kolay et al, in press).…”