Element 1 - Testing & Analysis
Task 1.5.1 Development of a Seismic Analysis Software for Woodframe Construction
PI: Andre Filiatrault (University at Buffalo, SUNY - Formerly of UCSD)
The main objective of Task 1.5.1 is to develop a specialized computer platform for the nonlinear seismic analysis of woodframe buildings.
Task 1.5.1 incorporates the following two main parts, namely:
- Part 1: Development of a computer program for the Cyclic Analysis of SHEar Walls (CASHEW)
A simple numerical model to predict the load-displacement response and energy dissipation characteristics of wood shear walls under general quasi-static cyclic loading has been developed. In this model the shear wall is comprised of 3 structural components: rigid framing members, linear elastic sheathing panels and non-linear sheathing-to-framing connectors. The hysteretic model for the sheathing-to-framing connector takes account of pinching behavior and strength and stiffness degradation under cyclic loading. A robust displacement control solution strategy is utilized to predict the wall response under general cyclic loading protocols.
The shear wall model has been incorporated into the computer program CASHEW: Cyclic Analysis of SHEar Walls. The predictive capabilities of this program have compared with monotonic and cyclic tests of full-scale wood shear walls. It has been shown that this model can accurately predict the load-displacement response and energy dissipation characteristic of wood shear wall under general cyclic loading.
- Part 2: Interfacing CASHEW Model with a Three-dimensional Nonlinear Seismic Analysis Model
The CASHEW model will be used in conjunction with a three-dimensional nonlinear seismic analysis model. A pancake model that simulates the three-dimensional seismic response of a woodframe construction through a degenerated two-dimensional planar analysis is being used. In this approach, each shear wall is modeled as a non-linear shear element that adds only one degree of freedom to the problem (in-plane wall behavior).
• CUREE Report : W-08: CASHEW - A Computer Program For The Cyclic Analysis of Wood Shear Walls
• CUREE Report : W-21: SAWS - Seismic Analysis of Woodframe Structures