Dietlinde Köber

Technical University of Civil Engineering of Bucharest · Reinforced Concrete Department

Authors of EC8 chapters present topic related differences between the Eurocode 8 First and Second Generation.

Southern Romania is a geographic region with alluvial deposits. This soil type leads to rather long corner periods and provides as a particularity of the response spectrum an enlarged plateau. These conditions produce large displacement demands. Moreover, pulse-type ground acceleration records make this seismic area more unique. Research on the sei...

Second Generation EC8 webinar series

EAEE Workshop on Irregular and Complex Civil Structures 2023 in Catania Springer book proceedings

The minaret of the Great Mosque in Algiers is the highest in the world, with a total height of 265m above ground. The region has an important seismic risk, characterized by 6,5m/s2 peak ground acceleration and 1000 years return period. Due to the minaret slenderness (26,5m plan layout side) and to the special composite structure chosen to withstand...

The use of natural, local available construction materials is a possible solution for more resilient buildings. The paper presents particularities of the modeling process of timber stiffenings for walls with the TRAROM configuration. A simple model based on frame elements and axial force point hinges has been built for two specimen types. Overall w...

A plan irregular hospital building, having one underground floor and five overground levels has been analysed. The frame type building is part of a hospital ensemble built in Bucharest, in a high corner period seismic area. For these challenging seismic conditions the efficacy of base isolation is investigated. Two design attempts are considered: b...

Southern Romania experiences special soil conditions, leading to rather long corner periods and to an enlarged plateau of the response spectrum, with associated large displacement demands. Pulse-type ground acceleration records complete this unique seismic area. Research on the seismic behavior of structures built under these special conditions is...

The newly proposed structural system (TRAROM), made of timber posts, beams, internal diagonals and planks laid on orthogonal directions on both sides of the wall, is influenced by the architecture of traditional timber houses in Romania. Walls with different layouts were tested to in-plane static cyclic loading in order to obtain the best one, focu...

A lightweight structural timber system is proposed, inspired from traditional Romanian architecture, and adapted to the current needs (wider spaces and increased comfort) and to the local construction market (low skill workforce, poorly controlled material quality, diversity of materials). A good seismic behavior was, also, a target, because Romani...

If the substantial decrease of the q behaviour factor accounted for torsionally flexible structures has a significant beneficial effect on the safety factor.

The design of structures subjected to torsional effects is highly complex, and becomes more difficult to assess when elevation irregularity is also present. This paper has as main objective to present the particularities of design for a plan as well as elevation irregular structure (11.0 × 15.0 m layout and 15.50 m total height), built in Bucharest...

This book presents state-of-the-art knowledge on problems of the effects of structural irregularities on their seismic response. It also covers specific spatial and rotational seismic loads on these structures. Rapid progress in respective research on irregular structures and unconventional seismic loads requires prompt updates of the state of the...

The southern part of Romania is characterized by special soil conditions, i.e. thick soil deposits of Romanian Plain, leading to a long corner period of response spectra Tc=1.6s with associated large displacement demands in the Romanian Seismic Design Code P100-1 (2013). The stiffening approach to control the structural seismic response may therefo...

A lightweight structural timber system is proposed, inspired from traditional Romanian architecture, and adapted to the current needs (wider spaces and increased comfort) and local construction market (less skilled workers, poorly controlled material quality, diversity of materials). The good seismic behavior was also a target, because Romania is o...

Structures with uneven distributions of mass and stiffness (in the elastic range of behavior) and of mass and strength (in the inelastic range of behavior) are subjected to general torsion. These structures are called plan irregular ones. From a static elastic point of view general torsion may be described as a rotational movement around the center...

Plan irregular structures experience a torsional seismic response even if the seismic input is unidirectional, due to an uneven distribution of mass and stiffness (in the elastic range of behavior) and of mass and strength (in the inelastic range of behavior). The seismic behavior of plan irregular structures is difficult to preview due to coupling...

Structures with uneven distributions of mass and stiffness (in the elastic range of behavior) and of mass and strength (in the inelastic range of behavior) are subjected to general torsion. These structures are called plan irregular ones. From a static elastic point of view general torsion may be described as a rotational movement around the center...

Plan irregular structures experience a torsional seismic response even if the seismic input is unidirectional, due to an uneven distribution of mass and stiffness (in the elastic range of behavior) and of mass and strength (in the inelastic range of behavior). The seismic behavior of plan irregular structures is difficult to preview due to coupling...

In [1] a design methodology is presented for the seismic design of structures, using realistic cracked member stiffness and explicitly allowing for additional wall displacements related to torsion. Because the methodology is only suited for earthquake design separately in the principal directions of the building, the question arises whether a build...

Two strong earthquakes hit the region of Van (Turkey) in 2012, generating major losses. A large part of the building stock was damaged causing the evacuation of the residents. A post-earthquake investigation team dispatched by the UNESCO through the IPRED platform, six month after the earthquakes, observed the damage state in some still standing bu...

In [1] wird ein Bemessungsverfahren für durch Erdbeben beanspruchte Tragwerke vorgestellt, mit dem die explizite Berücksichtigung von torsionsbedingten Verschiebungen möglich ist und bei dem realistische Biegesteifigkeiten für die Wände verwendet werden. Da mit diesem vereinfachten Verfahren mit vertretbarem Aufwand nur der getrennte Tragsicherheit...

Das Minarett der Großen Moschee von Algerien wird das höchste Minarett weltweit und das höchste Bauwerk Afrikas sein. Das Projekt wurde von deutschen Architekten und Ingenieuren geplant und befindet sich zurzeit im Bau. Das Bauwerk unterliegt einem extrem hohen Erdbebenrisiko. In Verbindung mit der extremen Schlankheit des Gebäudes und seinem außer...

Das Bukarester Nationalstadion ist eine modern ausgestattete Fußballarena für 55 000 Zuschauer, die komplett überdacht werden kann. Im Aufsatz werden das Tragwerkskonzept der Stahlbetonkonstruktion und die Grundsätze der Ausbildung der Fertigteile und deren Anschlüsse beschrieben. Bukarest liegt in einem stark gefährdeten Erdbebengebiet und das hat...

The Minaret of the Great Mosque of Algeria - A very special structure. The minaret of the Great Mosque of Algeria will be the highest minaret in the world and Africa's highest skyscraper. The project designed by a German team of architects and engineers is under construction. The site is exposed to an extremely high seismic risk. This in conjunctio...

The Great Mosque in Algiers will be the third largest mosque in the world and its minaret the highest. The region has a high seismic risk. The project designed by a German team of architects and engineers is under construction and will be finished by 2016. Due to the minaret slenderness and to the special composite structure chosen to withstand lat...

A proposed simplified method (called) SESA is used to estimate the displacement amplification due to general torsion. The SESA method uses modal response spectrum analysis and takes into account the inelastic behavior by applying the capacity spectrum method. For single-story structures, the single degree of freedom inelastic system is equated to a...

General torsion is a phenomenon of interest especially for plan irregular structures. General torsion is difficult to control, mostly because of the elastic computation approach provided by nowadays seismic design codes that differs from the real, nonlinear behaviour of plan irregular structures. Therefore, in order to reduce the amount of plan irr...

Modern construction materials and building strategies offer a large variety of architectural conceptions the chance to become reality. Often architects and engineers choose irregular structural systems (in plan and elevation) for their design. This paper focuses on single-story plan irregular structures. Plan irregularity may come from an uneven di...

Plan irregularity occurs due to the uneven distribution of mass or stiffness. Plan irregular structures are subjected to translation and rotation although the seismic input is unidirectional. This complex movement is called general torsion and leads to supplementary displacements in the structural elements, compared to plan symmetric structures, [4...

The Great Mosque in Algiers will be the third largest mosque in the world and its minaret the highest. The region has a high seismic risk. The project designed by a German team of architects and engineers is under construction and will be finished by 2016. Due to the minaret slenderness and to the special composite structure chosen to withstand lat...

Nowadays seismic design codes recommend as current design methods for plan irregular structures the static elastic calculation method with equivalent horizontal forces and the modal response spectrum analysis method. Effects of general torsion are taken into account in the elastic range of behavior by considering a static eccentricity (equal to the...

One of the structural types subjected to general torsion are plan irregular structures. Many of the studies that applied simplified methods in order to estimate the seismic response of plan irregular structures showed a high sensitivity of results to the seismic input. This paper analyses two single-story plan irregular structures (twist restricted...

Structural engineers may use rules from nowadays seismic design codes in order to decide if a structure is torsional sensitive or not. For example, such rules from the Romanian and the European Seismic Design Code deal with measures like the torsional ratio, the radius of gyration or displacements of the floor edges. If torsional sensitivity canno...

A proposed simplified method (called) SESA is used to estimate the displacement amplification due to general torsion. The SESA method uses modal response spectrum analysis and takes into account the inelastic behavior by applying the capacity spectrum method. For single-story structures, the single degree of freedom inelastic system is equated to a...

The study investigates the feasibility of a proposed simplified method for the estimation of the effects of general torsion on single story irregular structures under seismic action. The method (called SESA) is based on superposition of modal effects but it is extended to nonlinear behaviour of the structure by using overdamped displacement respons...

The study investigates the feasibility of a proposed simplified method for the estimation of the effects of general torsion on single story irregular structures under seismic action. The method (called SESA) is based on superposition of modal effects but it is extended to nonlinear behaviour of the structure by using overdamped displacement respons...