15 Fakultätsübergreifend / Sonstige Einrichtung
Permanent URI for this collectionhttps://elib.uni-stuttgart.de/handle/11682/16
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Item Open Access Size effect of the concrete cone failure load of anchor bolts(1992) Eligehausen, Rolf; Bouska, Petr; Cervenka, Vladimir; Pukl, RadomirThe concrete cone capacity of headed anchor bolts subjected to axial tension load was experimentally investigated using 35 concrete specimens of three different sizes. The dimensions of the test specimens were varied in proportion to the embedment depth h (h = 50, 150 and 450 mm). Material properties were measured on accompanying specimens. The measured failure loads are compared with other experimental and numerical investigations. According to the present results the failure loads increase in proportion to h 16, that means close to the prediction by linear fracture mechanics.Item Open Access Analytical model for deformed bar bond under generalized excitations(1981) Ciampi, Vincenzo; Eligehausen, Rolf; Bertero, Vitelmo V.; Popov, Egor P.Ein mathematisches Modell zur Berechnung des Verhaltens eines Rippenstabes, verankert in eng verbügeltem Beton und beansprucht durch beliebige zyklische Belastungen hoher Intensität wird erläutert. Es umfasst die Formulierung eines vereinfachten Modells für die Beziehung zwischen örtlicher Verbundspannung und örtlichem Schlupf, das aus umfangreichen, in Berkeley durchgeführten Versuchen abgeleitet wurde; die Benutzung eines einfachen, jedoch ausreichend genauen Modells für das Spannungs-Dehnungs Gesetz des Bewehrungsstahles und die numerische Lösung der Differentialgleichung des Verbundes. Ein Beispiel ist dargestellt und erläutert.Item Open Access Creep and fatigue analysis of reinforced concrete structures(1992) Eligehausen, Rolf; Kazic, Mihajlo; Sippel, Thomas M.A computional procedure for the creep and fatigue analysis of reinforced concrete structures exposed to flexure is presented. The fatigue loading effects are modified into an equivalent creep analysis. The analysis is based on the finite element method employing beam elements. The material behavior of steel, concrete and bond between reinforcement and concrete are described as realisticly as possible. For the reinforcing steel the stress-strain behavior as measured in tests or given in codes is assumed. For the stress-strain behavior of concrete in compression under static loading, the proposal by Park/Pauley is taken. The influence of sustained or fatigue loading is taken into account by using the isochrone σ-ε-relationship valid for t > t o or N > 1 respectively; whereby the creep coefficients for both type of loadings are taken from MC90. For sustained and fatigue loading the isochrone bond stressslip relationship is used. The creep coefficients are taken from MC90. The accuracy of the proposed model is checked by comparing the behavior of some test beams under sustained and fatigue loading with the predictions.Item Open Access Computer models of concrete structures(1991) Cervenka, Vladimir; Eligehausen, Rolf; Pukl, RadomirThe application of the nonlinear finite element analysis of concrete structures as a design tool is discussed. A computer program for structures in plane stress state is described and examples of its application in the research of fastening technique and in engineering practice are shown.Item Open Access Fracture analysis of concrete plane-stress pull-out tests(1991) Cervenka, Vladimir; Pukl, Radomir; Eligehausen, RolfThis paper reports on a parameter study which was performed for the Round Robin Analysis Of Anchor Bolts organized by RILEM Committee TC-90 FMA (Fracture Mechanics Applications). 18 plane-stress pull-out specimens were analyzed by the computer program SBETA which is based on the finite element method and takes into account nonlinear fracture mechanics. A simplified formula for the design of such anchors is derived.Item Open Access Hysteretic behavior of deformed reinforcing bars under seismic excitations(1982) Ciampi, Vincenzo; Eligehausen, Rolf; Bertero, Vitelmo V.; Popov, Egor P.A mathematical model of a deformed bar an anchored in a concrete block, recently developed by the authors, has been generalized to cover the bond conditions found in exterior and interior joints of reinforced concrete frames subjected to severe earthquake loadings. The analytically predicted response compares well with the results of a series of tests conducted in Berkeley for monotonic and cyclic loadings. An extensive numerical investigation has been carried out to show the influence on the anchored bar behavior of different parameters such as: 1) Severity of hysteretic requirements, 2) Characteristics of steel (namely yield stress and strain hardening), 3) anchorage length. The results of this investigation are used to offer some practical recommendations and conclusions.Item Open Access Behaviour of metallic anchors under generalized excitations(1989) Eligehausen, Rolf; Vintzéleou, ElizabethIn this paper are briefly presented the results of an experimental program which was carried out with the aim to investigate the behaviour of several types of metallic anchors (undercut, expansion and chemical anchors) under both monotonic and cyclic shear actions. Several parameters were investigated within the program, namely: the presence of cracks crossing the anchor, the distance of the anchor from the free edges of the concrete section, the presence of transverse reinforcement, the loading history, etc. The influence of these parameters on the mechanical characteristics of anchors is illustrated in this paper, while empirical formulae for the calculation of the maximum shear force vhich may be transferred by metallic anchors are given.