Seismic Response of Pipeline Systems in a Soil Liquefaction Environment

This research is a study of the general seismic response behavior of buried pipeline systems during a soil liquefaction process. To aid the design of buried pipelines in a soil liquefaction environment, the purpose of this research is to provide the basic dynamic seismic response of different pipeline systems. Several important parameters such as pipe diameter, buried depth, additional mass and the size of the liquefiable soil zone have been introduced. The pipeline systems under study are cross-types, T-types and straight pipelines, with or without a manhole, buried in a soil liquefiable zone. Time-varying soil spring constants are used for the analysis of the soil liquefaction process. The equation of motion includes nonlinear geometric and material damping terms. The pipe body is assumed to be elastic. A computer program based on the finite element method has been developed. The mode superposition method is used to solve the equation of motion of the pipeline. The required eigenvalues and eigenvectors are calculated by subspace iterations. A few uncoupled modal equations of motion are solved by a step-by-step numerical integration method. This dissertation presents the background, formulation, verification of the developed program, numerical results, conclusions of seismic response of buried pipeline systems under a soil liquefaction environment and suggestions of future research to aid seismic design of pipeline systems

Proceedings of the 4th International Conference on Service Life Design for Infrastructure (SLD4)

SLD4 is a conference on Service Life Design for Infrastructures which is jointly organised by Delft University and Tongji University as part of the RILEM week 2018 in Delft, The Netherlands. The conference builds on the success of the previous three events on this topic held in Shanghai (2006), Delft (2010) and Zhuhai (2014). Service Life Design for Infrastructure is a very broad topic involving aspects starting from the material properties and behaviour, via structural performance, serviceability and durability to integral design and asset management. All related topics from experimental research to modelling and from codes and standards to applications are welcomed to the conference. The conference consist of 3 key-note papers and 132 regular papers presented over 3 days. Parallel to the SLD4 Conference a symposium on Concrete Modelling (CONMOD2018) and a workshop honouring Professor Klaas van Breugel were organised with topics that are related to Service Life Design. In total more than 350 participants took part in the events organised during the RILEM week 2018

Proceedings of the Symposium on Concrete Modelling, CONMOD2018

CONMOD2018 is a symposium on Concrete Modelling which is jointly organised by Delft University and Ghent University as part of the RILEM week 2018 in Delft, The Netherlands. The symposium is the 5th in a series dealing with all aspects concerning modelling of concrete at various scales. The symposium consist of 3 key-note papers and 62 regular papers presented over 3 days. Parallel to the CONMOD2018 symposium a conference on Service Life Design (SLD4) and a workshop honouring Professor Klaas van Breugel were organised with topics that are related to concrete modelling. In total more than 350 participants took part in the events organised during the RILEM week 2018

Subspace Methods for Face Recognition: Singularity, Regularization, and Robustness

Face recognition has been an important issue in computer vision and pattern recognition over the last several decades (Zhao et al., 2003). While human can recognize faces easily, automated face recognition remains a great challenge in computer-based automated recognition research. One difficulty in face recognition is how to handle the variations in expression, pose an