Optimization of the structural coupling between RC frames, CLT shear walls and asymmetric friction connections

Abstract

This paper focuses on the optimum design of the e-CLT technology. The e-CLT technology consists in adding cross laminated timber (CLT) walls to an existing reinforced concrete (RC) infilled frame via asymmetric friction connection (AFC). The authors carried out quasi-static and nonlinear dynamic analyses. The RC frame is modeled in OpenSees by fiber-section-based elements with force-based formulation. The contribution of the infill is simulated using a degrading data-driven Bouc–Wen model with a slip-lock element while the AFC is modelled with a modified Coulomb model. Different types of infill, aspect ratio, scaling, and member size are considered. The benefits of using e-CLT technology are discussed and the ranges of optimum performance of the AFC are estimated. A comparison of the performance of traditional infills with the e-CLT system is presented. The authors provide optimum intervals of the ratio between slip force and in-plane stiffness of the CLT panel, following energy and displacement-based criteria. The seismic displacement demand under various seismic scenario is investigated. Correlations between the RC characteristics and the optimum design ratios bestow possible criteria for the design of the AFC.

The Use of Structural Timber in Europe: An Overview on Recent Developments

“…In Figure 4, instead, is represented the reinforcing system proposed by Aloisio et al [41], which consists of infill CLT panels connected to existing frames by means of asymmetric friction dampers (named with e-CLT). The Figure also compares the cyclic behavior of bare frame, infilled masonry RC frame and the e-CLT system: the introduction of CLT panel implies a strength reduction with respect the infill masonry frame but a significant increase in energy dissipation.…”

Optimized CLT-Rc Frame Connection for Seismic Retrofitting

“…On the other hand, inelastic behaviour is improved only by the connections where CLT is attached to the frame [5][7] [8]. Many traditional and innovative RC-CLT connections have been suggested to demonstrate their abilities to improve the main frame responses emphasizing on nonlinear analyses [9][10] [11] [12] [13]. A comparison made between those connectors which have various Force/Deformation curves shows how much elastic/inelastic response of the frame strengthened by CLT is associated to the connector curve [2] [8].…”

Design of Asymmetric Friction Connection for Sesimic Retrofitting of Rc Frames With Cross-Laminated Timber Panels

“…Zamani and Quenneville proposed a resilient slip friction connection (RSF) as a hold-down connector for CLT panels [36]. So far, no AFC was used as a connection system for CLT panels except for the attempts by Boggian et al [37]- [39]. Boggian et al tested AFCs for a hybrid structural system, the e-CLT technology.…”