SS 1-2: Industrial Risk Reduction System (IRIS)

Helmut Wenzel, VCE – Vienna Consulting Engineers, Vienna, Austria

Helmut Wenzel    


The management of the constructed infrastructure requires models that describe the entire lifecycle. Such a model of generic nature is proposed by the FP7 Research Project IRIS (CP-IP 213968-2).

IRIS proposes a simple basic model with considerable uncertainties, which is improved step by step through introduction and evaluation of new knowledge gained about a structure. The ideal result is a precise assessment of the condition with reasonable margins of uncertainty. The model will be able to show the effect of retrofit actions as well as resulting degradation from accidents or natural disasters.

It is acknowledged that the basic model shall be kept simple and transparent for the end users. In return the background computation is expected to become more and more complex with every new knowledge and methodology developed.

Methodologies for the management of the constructed infrastructure are developed in the IRIS Project (CP-IP 213968-2). The basis is the consideration of the entire lifecycle of a structure. In bridge management this is performed based on the BRIMOS® method developed by VCE, which allows introducing additional quantitative parameters through monitoring techniques.

In order to meet the governing requirements regarding integral life cycle analysis, durability, the real degradation process and residual lifetime considerations the following major aspects are to be considered for life cycle modeling:

a) The determination/estimation of the design life of new structures
b) The determination/estimation of the residual life of existing structures
c) Assessment criteria whether the real degradation process
d) Maintenance instructions to guarantee the original design life and preservation of functions


Reliability of decisions based on lifetime functions and monitoring data
A. Del Grosso, F. Lanata

Evaluation of structural behaviour of a fire damaged highway bridge in Lagos-Nigeria with BRIMOS® structural health monitoring
P. Furtner, R. Veit-Egerer, J. Buchmann, M. Buschlinger

Monitoring and evaluation of an arch bridge over the Traun River - Austria affected by the blasting of the adjacent highway bridge
R. Veit-Egerer, M. Widmann, H. Wenzel

Management concept for highway infrastructure based on life cycle analysis providing heavy maintenance instructions and cross asset harmonisation
R. Veit-Egerer, P. Furtner, K. Gragger, W. Neumann

Ultrasonic monitoring of high temperature pipes in power plants using wave guides
B. Weihnacht, T. Klesse, U. Lieske, B. Frankenstein

Contribution to US long-term bridge performance program with regard to life cycle investigations – Reference bridge New Jersey
H. Wenzel, M. Widmann, A. Aktan, F. Moon

International investigation on the earthquake damaged Chi-Lu cable stayed bridge after repair and several years of operation
H. Wenzel, R. Veit-Egerer, T. Lin, Z. Lee

Seepage analysis of a gate dam with a layered deep deposit foundation
M. Wu, L. Yang, X. Hu