Bartosz Sobczyk

Damage Analysis of Tensioning Cable Anchorage Zone of a Bridge Superstructure, Using CDP Abaqus Material Model

Abstract Numerical analysis of the tensioning cables anchorage zone of a bridge superstructure is presented in this paper. It aims to identify why severe concrete cracking occurs during the tensioning process in the vicinity of anchor heads. In order to simulate the tensioning, among others, a so-called local numerical model of a section of the bridge superstructure was created in the Abaqus Finite Element Method (FEM) environment. The model contains all the important elements of the analyzed section of the concrete bridge superstructure, namely concrete, reinforcement and the anchoring system. FEM analyses are performed with the inclusion of both material and geometric nonlinearities. Concrete Damage Plasticity (CDP) constitutive relation from Abaqus is used to describe nonlinear concrete behaviour, which enables analysis of concrete damage and crack propagation. These numerical FEM results are then compared with actual crack patterns, which have been spotted and inventoried at the bridge construction site.

Laminaty FRP w budownictwie ? charakterystyka materiału i aspekty projektowania

W artykule przedstawiono charakterystyke laminatow polimerowych wzmacnianych wloknami. W pierwszej cześci zaprezentowano teoretyczne modele materialowe, podstawowe zalezności naprezenie-odksztalcenie wlokien, matrycy oraz laminatu powstalego przez polączenie obydwu skladnikow. Na tej podstawie sformulowano zalecenia dotyczące praktycznego wykorzystania laminatu w kontekście jego wytezenia w projektowaniu elementow konstrukcyjnych. W drugiej cześci omowiono metody szacowania nośności kompozytow wloknistych z matrycą polimerową w kontekście metod zniszczenia: pierwszego (ang. First Ply Failure – FPF) i ostatniego wlokna (ang. Last Ply Failure – LPF) oraz związane z nimi wybrane kryteria inicjacji zniszczenia.

Analiza drgań kładki kompozytowej wywołanych działaniem wiatru

in the work, we describe a simplified method for numerical analysis of a FrP composite footbridge in the field of wind induced vibrations. we consider a simply supported structure with a span length of 16 m and U-shape cross-section. Firstly, a two dimensional flow analysis is performed of the fixed bridge cross-section which is subjected to a lateral wind action with 10 m/s velocity. calculations are performed using aNsys FlUeNt 14 software. results of the flow analysis (strouhal’s number) are compared with the results presented in a monograph by a. Flaga, entitled Inzynieria Wiatrowa. Podstawy i zastosowania (Wind Engineering. The bases and applications) (in Polish), arkady, warszawa, 2008, in order to validate calculations. after that, a three dimensional spatial model of the footbridge is built in aBaQUs 6.12-3 finite element method software. a modal dynamics problem is solved, where the loading conditions are adopted on the basis of the flow analysis and applied as an evenly distributed pressure on the bridge deck surface. Finally, the users’ vibration comfort criterion is checked for the considered structure.