Under external load excitation, damage such as breathing cracks and bolt loosening will cause structural time domain acceleration to have nonlinear features. To solve the problem of identification, a identification method based on Kullback–Leibler (KL) distance model residuals is proposed in this paper. First, an autoregressive (AR) order was selected using autocorrelation function (ACF) Akaike...

In  this  paper  a  new  method  is  presented  for  structural  damage  identification.  First,  the damaged structure is  excited by short  duration impact acceleration  and then, the  recorded structural displacement time history responses under free vibration conditions are analyzed by Continuous Wavelet Transform (CWT) and Wavelet Residual Force (WRF) is calculated. Finally, an effective d...

WINDA is an integrated system of models for calculating the stand-wise probability of wind damage of trees within a landscape (Blennow & Sallnäs, submitted). It integrates a modified version of the dose/response model HWIND (Peltola et al., 1999), the airflow model WASP (Mortensen et al., 1998), and a component for calculating the zero-plane displacement and surface roughness. WINDA uses a GIS ...

Optimal thinning regimes for achieving several management objectives were derived from two stand-growth simulators by dynamic programming. Residual mean tree volumes were then plotted against stand density on density management diagrams. The results supported the use of density management diagrams for comparing, checking, and implementing the results of optimization analyses. FOREST ScI. 30:82-...

changes in dynamic properties of structures indicate occurrence of damages in the structures. in this paper, a new two stage algorithm for damage detection of large structure is introduced. a modified residual force method is utilized to locate the damage regions in structures, especially barrel vaults, and then the enhanced charged system search (css) algorithm is used to quantify the amount o...

This paper compares and contrasts hurricane-related damage recorded across the Mississippi landscape in the 2 years following Katrina with initial damage assessments based on modeled parameters by the USDA Forest Service. Logistic and multiple regressions are used to evaluate the influence of stand characteristics on tree damage probability. Specifically, this paper addresses four primary quest...

The risk of river flooding is expected to increase with climate change and socioeconomic development, therefore additional protection measures are required reduce the potential for increased flood damage. While studies have investigated effectiveness adaptation risks, none has evaluated residual damage (RFD), which reflects projected in under intensive adaptation. Here we evaluate RFD several o...