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Zachowanie się kotew metalowych do betonu pod obciążeniem statycznym

Waśniewski Tomasz, Habiera-Waśniewska Elżbieta

Inżynieria i Budownictwo

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2022

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R. 78, nr 5-6

226--231

PL

W artykule przedstawiono rodzaje kotew metalowych stosowanych do betonu i sposoby przekazywania obciążenia z ich korpusu na podłoże. Omówiono różnice i ograniczenia wynikające z budowy poszczególnych kotew. Przedstawiono modele zniszczenia i zachowanie się kotew na skutek ich wyciągania bądź ścinania. Poruszono także niezwykle ważny aspekt instalacji kotew w podłożu zarysowanym.

EN

The paper presents the types of metal fasteners used in concrete and the ways of transferring the load from their body to the concrete. Differences and limitations resulting from the construction of particular fasteners are discussed. Models of failure and behaviour of the fasteners due to tension or shear are presented. An extremely important aspect of anchor installation in cracked concrete is also discussed.

2

Estimation of the adherence of mortars using ultrasound

Khaldi Nacera, Belachia Mouloud, Benouis Abdelhalim

Civil and Environmental Engineering Reports

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2020

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Vol. 30, no. 2

185--199

EN

Mortars are subjected to severe external stresses such as freezing, thawing, and drying during their lifetime. These stresses can lead to a loss of adhesion between the support and the mortar. The strength of the substrates with respect to their ability to receive a coating (mortar) is characterized in particular by the value of minimum tear resistance of the surface to be coated. In this work, the use of a non-destructive method which is both fast and easy to implement is employed to evaluate this support-mortar adhesion. The first method is based on the measurement of the velocities of the surface ultrasonic waves and the second by tearing tests using a specific dynamometer. The determination of the adhesion strength concerned two different supports (concrete beam and masonry block) coated with two types of mortar (a prepared cement mortar and a ready-to-use mortar) with two different thicknesses for each mortar (1 and 2 cm, respectively). The results of the two methods are then correlated for an estimation of the adhesion of the mortars.

3

Steel frame as the basis for checking the pull-out capacity of bonded diagonal anchor bolts

Tomaszewicz D.

Budownictwo i Inżynieria Środowiska

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2018

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Vol. 9, no. 1

39--44

EN

The paper concerns a device for testing diagonal anchorages, designed by the author. This device constitutes the basis for the testing equipment used for the performed test. No such research has been conducted so far. The article describes the way the rack was designed and what components it is made of. The possibilities and practical examples of the device are also indicated.

4

Evaluation of the compatibility of ceramic ball head and femoral stem taper on the new type THR

Rehak L., Zitnansky M.

Archives of Materials Science and Engineering

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2010

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Vol. 44, nr 1

58-61

EN

Purpose: of this paper was follow up of compatibility of femoral component taper from TiAl6V4 ELI acc.ISO5832-3 and ceramic head of the new type of total hip join replacement THR - ZRM in vitro. Design/methodology/approach: from december 2006 to august 2007 we have tested THR taper component and ball ceramic head. On the base of our patents ( SK, CZ, EU, USA) from 1999 to 2006 we have designed and developed the new type of cementlesss THR - ZRM. These total hip replacements were tested in our prospective study. We have evaluated compatibility and loading resistance of taper of THR ZRM made from TiAl6V4alloy ELI and ceramic ball head Biolox forte (28-12/14L) by tests of burst strength, pull out, rotational stability, fatigue and post-fatigue. Tests were monitored independent observer. Findings: in the burst test were tested 7 parts and average loading was 54 kN. The reached values comply with the requirements according to CeramTec procedure VA 02 04 4129 and the FDA Guidance document for the preparation of premarket notifications for ceramic ball hip systems. In the fatigue test all specimens test at a maximum load of 14 kN reached 10 million cycles without mechanical failure. The post fatigue test was performed with load of 46 kN and no failure of head and taper system was observed. The pull-off tests were made with pull out strength of 1439 N has been used on 5 parts and no pullout of ceramic ball head of taper femoral component was observed. Last was the test of rotational stability, where ball head was rotational stable under strength of 1254 Ncm. Research limitations/implications: this study was performed on the small group of spices but enough relevant according FDA and international ISO prescriptions. Originality/value: this study is original by publishing first results of the new cementless THR- ZRM tests of compatibility and fatigue of metal taper and ceramic ball head. Value of this paper is in vitro testing and prepares ZRM cementless THR for clinical use in human.