WTM Engineers GmbH

Hamburg, Germany

WTM Engineers GmbH

Hamburg, Germany
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Schule M.,Amt fur Neckarausbau Heidelberg | Carstensen N.,WTM Engineers GmbH | Seegert S.,WTM Engineers GmbH | Jappelt U.,WTM Engineers GmbH | Vieth H.-J.,KREBSKIEFER Ingenieure GmbH
Bautechnik | Year: 2017

Repair of the left chamber of the Neckar lock Aldingen and of the upstream boat landing. From 1921 to 1968, the Neckar was extended over a length of approximately 200 km to a federal waterway. The lock was built as part of the water retaining structure in the course of the canalisation of the Neckar from the 1930s, interrupted by the Second World War, until the end of the 1950s. The chambers of the double lock have a length of 110 m and a width of 12 m, the head is 3.60 m. The article describes the planning of a major overhaul of the left chamber of the Neckar lock Aldingen as well as of strengthening measures of the upstream boat landing such as: refurbishment of the chamber (concrete facing) and lock heads, new construction of the lock-gates, replacement of the drives, as well as of the electrical systems and control technology, replacement of the slope revetment in the upstream boat landing (riprap), furthermore construction of a new pile berth with an access bridge. The planning is based on a study on the standardisation of the extension of the Neckar locks measures, prepared by the Federal Waterways Engineering and Research Institute and the Specialised Unit of Mechanical Engineering Southwest, besides being based on the technical body of rules. The article concludes with an insight into the ongoing construction works. Copyright © 2017 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin

Haberland M.,WTM Engineers GmbH | Morgen K.,WTM Engineers GmbH
Beton- und Stahlbetonbau | Year: 2017

Support areas of deep beams. The critical areas of deep beams are the support areas. Their design and detailing require particular attention, especially when limits are extended. The first choice document for the detailing of deep beams for decades, the DAfStb Heft 240, is nowadays no longer consistent in all issues with the now valid Eurocode 2. Both documents are not exhaustive at present. Assistance and recommendations are published at various places in order to fill these gaps. This article provides a summary of the author's key aspects regarding support areas. This is supplemented by considerations on indirect bearing. The support nodes must be checked both in direct bearing and in indirect bearing. If the primary support node fulfills the nodal strength checks in the case of indirect bearing, the load transfer zone can be reinforced following prescriptive detailing rules. If these checks cannot be fulfilled, it is advisable to explicitly design the load transfer zone. Copyright © 2017 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin

Sunderdiek H.,WTM Engineers GmbH | Eickmeyer D.,Wasserstrassen und Schifffahrtsamt Wilhelmshaven | Jappelt U.,WTM Engineers GmbH
Bautechnik | Year: 2016

Replacement construction of quays at the naval base in Wilhelmshaven. At the naval base of Wilhelmshaven the quay walls and dolphins of a floating bridge system are being renewed. The existing quays show extensive damage and stability deficits. In particular, microbially induced corrosion (MIC) on the back of the old sheet piling lead to rust corrosion of the old sheet pile walls. Content of the report is the conceptual and structural implementation of the measure quay renewal that has been executed since the beginning of 2013. Special attention is paid to the security of the stock during the construction period, the selected corrosion protection measures as well as the requirements for the installation of combined sheet piling. Copyright © 2016 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin

Anchored concrete base slabs are used as base sealing against pressurized groundwater e. g. at watertight excavations. Anchored concrete base slabs allow a minimum effect on groundwater. Anchored concrete base slabs are sophisticated engineering structures. The ultimate limit states by loss of static equilibrium due to uplift as well as anchorage failure are based on DIN EN 1997-1. The ultimate limit state of structural failure considering the concrete base slab is based on DIN EN 1992-1-1. In this paper the normative basics are compiled and their application is illustrated with an example. Besides the analysis based on the currently valid regulations a mechanical model for the load transfer in the concrete base is shown. The structural behavior of the generally non-reinforced base slabs is shown taking stabilizing effects along the edges as well as the distinction between peripheral and central region and the results from the slenderness ratio of the base slab into consideration. This paper refers to a paper from 2008 in this journal [3]. It features the changes through the introduction of the Eurocodes and the ultimate limit state of the concrete base. © 2014 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

Schacht G.,TU Dresden | Hoffmann N.,WTM Engineers GmbH | Marx S.,Leibniz University of Hanover
Stahlbau | Year: 2013

Concrete hinges have successfully been used in civil engineering constructions since over 100 years. Semi-articulations invented by Augustin Mesnager are classified as incomplete concrete hinges. These hinges are maintenance-free, economically and because of the crossed reinforcing bars in the hinge throat they are able to carry higher shear forces than unreinforced concrete hinges after Eugène Freyssinet. This paper gives an overview of the historical development of this type of hinge from the first idea of Mesnager till the successful use in civil engineering structures and bridges. The known experimental investigations of the bearing and deformation behavior are presented. The main findings are summarized and recommendations for the design and construction of concrete hinges under high shear forces are given. © 2013 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

Luhr S.,Wasser und Schifffahrtsamt Lauenburg | Morgen K.,WTM ENGINEERS GmbH | Wieser M.,Wayss and Freytag Ingenieurbau AG
Beton- und Stahlbetonbau | Year: 2015

The new road bridge Horsterdamm in the city of Lauenburg crosses the Elbe-Lübeck-Canal and a railway line. The old bridge, a riveted truss bridge, built in 1939, showed severe defects and had to be replaced. The new bridge is designed as an arched bridge with a composite concrete slab. A bunch of pipes and wires under the bridge lead to the decision to employ precast elements with a cast in place topping. The paper deals with some special design aspects and experiences during erection. Special attention is given to the advantages of the precast elements with respect to crack development due to hydration heat and constraint. © Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG.

Put an end to the noise - New construction of a noise reduction hangar for traffic airplanes at the airport Zurich For being able to guarantee a secure air traffic there have to be proceeded engine test runs at many airports. As most of these test runs are taking place outside of flight operations, which means at night, a ban on night flights would be useless if the sound propagation would be realized unhindered during the test. Therefore noise reduction hangars are constructed to impede the sound propagation. The hangar at the international airport Zurich offers place for traffic airplanes up to the size of a Boeing 747-8. In the case of this approximately 25.5 million Euros expensive construction only the function determines the design. The developed noise reduction installation offers next to the main purpose of reducing the noise emission the other big advantage of significantly increased availability independent of weather conditions. © 2015 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

Evaluation of Sustainable Infrastructure Using the Southern Quay of Helgoland as an Example Drawing on the planning of the Southern Quay of Heligoland, this article shows an opportunity to evaluate sustainable infrastructure. The analysis of different planning variants allows to rate the ecological aspect of sustainability. © 2015 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

Bransch M.,IBD Ingenieurgesellschaft mbH | Lehmann L.,WTM ENGINEERS GMBH
Computers and Geotechnics | Year: 2011

This article presents a new method for the calculation of elastic-plastic building ground deformations and elastic-plastic building ground failure including wave propagation in the ground. The presented procedure is a hybrid method, based on several common calculation methods. Included is a nonlinear calculation with the finite element method (FEM), a nonlinear HHT-alpha method with full Newton-Raphson iteration and the scaled boundary finite element method (SBFEM). The presented method can be used as a tool for the accurate calculation of building ground deformations and the stability of the subsoil with included dynamic loading. © 2010 Elsevier Ltd.

Braml T.,HFR Ingenieure GmbH | Taffe A.,HTW Berlin University of Applied Sciences | Feistkorn S.,Schweizerischer Verein fur Technische Inspektionen | Wurzer O.,WTM Engineers GmbH
Structural Engineering International: Journal of the International Association for Bridge and Structural Engineering (IABSE) | Year: 2013

Increasing daily traffic volume with rising numbers of axles and allowable load per axle demands appropriate load models for structural analysis. Such models have been developed and incorporated according to latest standards. By adopting the new load models, the load-bearing capacity of many in-service structures can be increased. Therefore, a realistic assessment of the structure especially for the existing bridges is needed. Nondestructive testing (NDT) is used to give realistic import values for structural analysis. This article outlines a procedure for combining the results of NDT in civil engineering (NDT-CE) and the stochastic models used for probabilistic analysis to quantify the reliability of a structure given by the reliability index. The idea of implementing the measurement results as statistic variables in stochastic models is not new. This article presents a novel flexible approach to quantify the uncertainty of measurement according to the Guide to the Expression of Uncertainty in Measurement (GUM). The GUM approach allows one to easily update input quantities and quantify their effect on the total uncertainty without repeating the whole process. The reliability of an NDT method can be quantified in advance by conducting carefully designed probability of detection (POD) studies. A case study of an existing bridge is presented here, where it will be shown by means of a sensitivity analysis how detailed knowledge-gained from reliable NDT-CE measurements-of the dead loads or the exact position of tendon ducts can influence the reliability index. Combining reliable NDT-CE measurements and probabilistic analysis allows assessment of the "true" as-built structure with the purpose of proving its stability based on detailed structural and statistical knowledge.

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