Soroushian, Siavash

Comprehensive Finite Element Simulation of the Flexible Wood Diaphragms

Abstract eng:
Unreinforced masonry (URM) buildings with flexible wood floors and roofs are known as one of the most seismically vulnerable building types in the world. These types of buildings accounts for major portion of the existing buildings in some countries like Mexico, Italy, Indonesia, Australia, and some portions of United States. The horizontal wood diaphragms of these buildings are intended to transfer inertial in-plane lateral forces to the vertical load resisting elements of the building (e.g. URM shear walls). However, failure of connections between the wood diaphragms and masonry walls and also flexibility of the diaphragm itself were identified as the major source of damage in URM buildings during the past earthquakes. In this research, a methodology for the modelling of flexible wood diaphragms is discussed using the LS-DYNA software. For doing so, elastic elements with the corresponding section properties are used to represent joists and planks. Planks are connected to the joists through the nails, which their hysteretic behavior are modeled using the nonlinear discrete beam elements. Methodology presented in this study is validated with the full scale experimental study performed at Texas A&M University. Also, the methodology further validated for various retrofitted scenarios with the experimental data. Finally, the modelling approach is extended to a typical full 3D two-story URM building that contains flexible wood floor and roof. In this building model, the nonlinear 4-node fully-integrated shell elements with previously validated embedded masonry material are used to capture the extent of damage in the URM walls. Also, the effect of retrofit options on the overall seismic performance of the building is investigated. This study aims to propose a novel analysis approach to better understand the behavior of flexible and retrofitted wood floor diaphragms. Also, this research facilitates the necessary analytical tools to study the integrated models of URM buildings with flexible wood floors.

Contributors:

Smith, Rob

Conference Title:

Proceedings of the 16th World Conference on Earthquake Engineering

Conference Title:

16th World Conference on Earthquake Engineering

Conference Venue:

Santiago (CL)

Conference Dates:

2017-01-09 / 2017-01-13

Rights:

Text je chráněný podle autorského zákona č. 121/2000 Sb.