Projects

 

Collaborative Research: Semi-Active Controlled Cladding Panels for Multi-Hazard Resilient Buildings – Passive Damper Device Study

CMMI 1463497 – PI James Ricles, Lehigh University; co-PI Spencer Quiel, Lehigh University

Building facades typically consist of cladding that is placed on the outside perimeter of the structure. Traditionally, cladding serves purposes of providing architectural envelope and protection to the occupants from the outside elements. The goal of this research project is to rethink cladding systems as multi-functional structural units. Not only would the cladding serve its traditional purposes, but it would also be engaged as an engineered system to protect the structure against multiple hazards, including seismic, wind, and blast loads. Cladding serves both as the point of application of externally applied lateral loads such as wind and blast as well as a contributor of added inertia to seismic or wind-induced vibrations. This project will explore the use of passive controlled connections between cladding and the structural framing of a building - these connections will be capable of providing damping to mitigate the effects of extreme loading. The results of the project will engage the cladding on a building to enhance a structure's resilience to multiple hazards.

The research team will perform advanced nonlinear numerical simulations of realistic buildings with passive damping devices to assess the various parameters that influence the performance of the devices. The simulations will be validated through large-scale experiments in the laboratory. The experiments will include real-time hybrid simulations for wind and seismic loading that account for the complete building system and its interactions with the damping devices and cladding. Air-blast shock tube tests will be conducted to simulate blast loading. Performance-based design procedures will be established to integrate the design of passive controlled cladding within a holistic structural design approach.


Collaborative Research: Semi-Active Controlled Cladding Panels for Multi-Hazard Resilient Buildings – Semi-Active Damper Device Study

CMMI 1463252 – PI Simon Laflamme, Iowa State University

Building facades typically consist of cladding that is placed on the outside perimeter of the structure. Traditionally, cladding serves purposes of providing architectural envelope and protection to the occupants from the outside elements. The goal of this research project is to rethink cladding systems as multi-functional structural units. Not only would the cladding serve its traditional purposes, but it would also be engaged as an engineered system to protect the structure against multiple hazards, including seismic, wind, and blast loads. Cladding serves both as the point of application of externally applied lateral loads such as wind and blast as well as a contributor of added inertia to seismic or wind-induced vibrations. This project will explore the use of semi-active controlled connections between cladding and the structural framing of a building - these connections will be capable of providing damping to mitigate the effects of extreme loading. The results of the project will engage the cladding on a building to enhance a structure's resilience to multiple hazards.

The focus of this project is to develop computational simulation of a prototype semi-active damping device, installed between the cladding and structural frame, to the varying loading frequencies and intensities from multiple hazards. The objective of the system is twofold: (1) to engage the cladding as a mass damper to mitigate inter-story drift due to lateral load vibrations; and (2) to utilize the device as an energy dissipator under lateral loads. An innovative semi-active device with decentralized control laws will be developed to satisfy the varying energy dissipation and control objectives associated with each hazard. The research team will perform advanced nonlinear numerical simulations of realistic buildings with semi-active damping devices to assess the various parameters that influence the control laws and performance of the devices. The simulations will be validated through large-scale experiments in the laboratory. The experiments will include real-time hybrid simulations for wind and seismic loading that account for the complete building system and its interactions with the semi-active damping devices and cladding. Air-blast shock tube tests will be conducted to simulate blast loading. Performance-based design procedures will be established to integrate the design of semi-active cladding within a holistic structural design approach.


Collaborative Research: A Resilience-based Seismic Design Methodology for Tall Wood Buildings – Structural Component Studies

CMMI 1635227 – PI James Ricles, Lehigh University; co-PI Richard Sause, Lehigh University
CMMI 1636164 – PI Shiling Pei, Colorado School of Mines
CMMI 1635156 – PI James Dolan, Washington State University

As the U.S. population continues to grow in urban communities, the demand for tall residential and mixed-use buildings in the range of eight to twenty stories continues to increase. Buildings in this height range are commonly built using concrete or steel. A recent new timber structural innovation, known as cross laminated timber (CLT), was developed in western Europe and is now being implemented around the world as a sustainable and low carbon-footprint alternative to conventional structural materials for tall buildings. However, an accepted and validated design method for tall CLT buildings to resist earthquakes has not yet been developed, and therefore construction of these tall wood buildings in the United States has been limited. This research will break this barrier by investigating a seismic design methodology for resilient tall wood buildings that can be immediately re-occupied following a design level earthquake and quickly repaired (compared to current building systems) after a large earthquake. Using the seismic design methodology developed in this project, the research team will work with practitioners across the engineering and architectural communities to design, build, and validate the performance of CLT wooden buildings by conducting full-scale sub-assembly system testing at the National Science Foundation (NSF)-supported Natural Hazards Engineering Research Infrastructure (NHERI) experimental facility at Lehigh University. This research will enable a new sustainable construction practice that is cost-competitive, thereby increasing demands for engineered wood production, providing added value for forest resources, and enhancing job growth in the construction and forestry sectors.

A series of full-scale bi-directional testing of building sub-assembly systems will be performed to investigate the performance of CLT rocking walls under simulated seismic loading conditions. The structural systems investigated will include post-tensioned CLT rocking walls. Implementing segmental rocking walls in a full building system will be a transformative concept that has yet to be realized physically. The rocking wall systems will be investigated under the context of holistic building behavior, including gravity systems and non-structural components. The test will enable the design methodology developed in this research to be experimentally validated, and will at the same time generate a landmark data set for tall wood buildings under dynamic loading that will be available to the broader research and practitioner community through the NHERI DesignSafe-ci.org Data Depot. The project will facilitate implementation of this new structural archetype by interfacing closely with practitioners in the Pacific Northwest interested in tall CLT buildings as a cost-competitive design option. Graduate and undergraduate students, including community college students, will actively participate in this research and gain valuable knowledge and experience, which will prepare them to become leaders in sustainable building practices using modern engineered wood materials.


Collaborative Research: A Resilience-based Seismic Design Methodology for Tall Wood Buildings – Non-structural Component Studies

CMMI 1635363 – PI Keri Ryan, University of Nevada
CMMI 1634628 – PI John van de Lindt, Colorado State University
CMMI 1634204 – PI Jeffrey Berman, University of Washington

As the U.S. population continues to grow in urban communities, the demand for tall residential and mixed-use buildings in the range of eight to twenty stories continues to increase. Buildings in this height range are commonly built using concrete or steel. A recent new timber structural innovation, known as cross laminated timber (CLT), was developed in western Europe and is now being implemented around the world as a sustainable and low carbon-footprint alternative to conventional structural materials for tall buildings. However, an accepted and validated design method for tall CLT buildings to resist earthquakes has not yet been developed, and therefore construction of these tall wood buildings in the United States has been limited. This research will break this barrier by investigating a seismic design methodology for resilient tall wood buildings that can be immediately re-occupied following a design level earthquake and quickly repaired (compared to current building systems) after a large earthquake. Using the seismic design methodology developed in this project, the research team will work with practitioners across the engineering and architectural communities to design, build, and validate the performance of CLT wooden building by conducting full-scale sub-assembly system testing at the National Science Foundation (NSF)-supported Natural Hazards Engineering Research Infrastructure (NHERI) experimental facility at Lehigh University. This research will enable a new sustainable construction practice that is also cost-competitive, thereby increasing demands for engineered wood production, providing added value for forest resources, and enhancing job growth in the construction and forestry sectors.

A series of full-scale bi-directional testing of building sub-assembly systems with non-structural components will be performed to investigate the performance of the non-structural components integrated with CLT rocking wall systems subjected to simulated seismic loading conditions. The on-structural systems investigated will include interior petitions with connection details possessing sliding tracks that limit the damage to the petitions. The research team will further push the boundary of existing performance-based seismic design by developing a design procedure that explicitly considers the time needed for the building to resume functionality after an earthquake. With the large-scale testing capacity provided by the NHERI experimental facilities, the design methodology will be experimentally validated, which will at the same time generate a landmark data set for tall wood buildings under dynamic loading that will be available to the broader research and practitioner community through the NHERI DesignSafe-ci.org Data Depot. The project will facilitate implementation of this new structural archetype by interfacing closely with practitioners in the Pacific Northwest interested in tall CLT buildings as a cost-competitive design option. Graduate and undergraduate students, including community college students, will actively participate in this research and gain valuable knowledge and experience, which will prepare them to become leaders in sustainable building practices using modern engineered wood materials.