SHM of a stayed bridge during a structural failure, case study: the Rio Papaloapan Bridge

2017 ◽  
Vol 7 (2) ◽  
pp. 139-151 ◽  
Author(s):  
Francisco J. Carrión ◽  
Juan A. Quintana ◽  
Saúl E. Crespo
Keyword(s):  
Structural Failure

A probabilistic approach for design and certification of self-healing advanced composite structures

2011 ◽  
Vol 225 (4) ◽  
pp. 435-449 ◽  
Author(s):  
H R Williams ◽  
R S Trask ◽  
I P Bond
Keyword(s):  
Composite Structures ◽  
High Performance ◽  
Probabilistic Approach ◽  
Healing Time ◽  
Self Healing ◽  
Structural Failure ◽  
Healing System ◽  
Order Of Magnitude ◽  
Damage Tolerant

Design and certification of novel self-healing aerospace structures was explored by reviewing the suitability of conventional deterministic certification approaches. A sandwich structure with a vascular network self-healing system was used as a case study. A novel probabilistic approach using a Monte Carlo method to generate an overall probability of structural failure yields notable new insights into design of self-healing systems, including a drive for a faster healing time of less than two flight hours. In the case study considered, a mature self-healing system could be expected to reduce the probability of structural failure (compared to a conventional damage-tolerant construction) by almost an order of magnitude. In a risk-based framework this could be traded against simplified maintenance activity (to save cost) and/or increased allowable stress (to allow a lighter structure). The first estimate of the increase in design allowable stresses permitted by a self-healing system is around 8 per cent, with a self-healing system much lighter than previously envisaged. It is thought these methods and conclusions could have wider application to self-healing and conventional high-performance composite structures.

scholarly journals Diagnostics of the structural failure of sports hall external wall layers

2019 ◽  
Vol 284 ◽  
pp. 02005
Author(s):  
Leopold Kruszka ◽  
Pawel Muzolf
Keyword(s):  
Technical Condition ◽  
The Other ◽  
Diagnostic Process ◽  
Construction Technology ◽  
Structural Failure ◽  
External Wall ◽  
Aerated Concrete ◽  
Structural Failures ◽  
Construction Defects

The paper presents the diagnostics of the technical condition of the external layers of the sports hall walls. Structural failures related to construction defects themselves constitute a relatively small percentage (4.1% in 2017, 5.05% in 2014-2017 [1]), although the main reason for them is the lack of maintaining technological rigors (76.9% in 2017, 68.4% in 2014-2017 [1]). The presented and described case study of the technical condition of the newly built sports hall does not refer to structural failure, but to the reduction of the risk of that failure as a result of non-compliance with construction technology, in particular, in relation to the external walls. Contrary to the design, the walls of the sports hall were made of aerated concrete. According to the declaration of a designer, the contractor neither consulted the changes with the designer nor gain the acceptance of the designer for using aerated concrete instead of the primary proposed and designed brick structure. In addition, aerated concrete curtain walls with a height of about 4.5 m were made without any wall connectors. This resulted in a risk of a structure failure involving the collapse of its curtain walls. The technological requirements for the repairing of the elements of supporting walls as well as the diagnostic process of the other damaged finishing cladding of external walls are also provided in this paper.

scholarly journals Structural Safety Assessment of Marine Operations From a Long-Term Perspective: A Case Study of Offshore Wind Turbine Blade Installation

2019 ◽  
Author(s):  
Amrit Shankar Verma ◽  
Zhen Gao ◽  
Zhiyu Jiang ◽  
Zhengru Ren ◽  
Nils Petter Vedvik
Keyword(s):  
Failure Probability ◽  
Safety Assessment ◽  
Routine Activity ◽  
Structural Safety ◽  
Offshore Wind Turbine ◽  
Structural Failure ◽  
Blade Root ◽  
Extreme Response

Abstract A marine operation is a complex non-routine activity of limited duration carried out in offshore environment. Due to safety reasons, these operations are normally performed within specific sea state limits, which are derived from numerical modelling and analysis of hazardous events. In view of the uncertainties in the assessment of structural responses under stochastic environmental conditions, these limiting curves correspond to a target structural failure probability recommended in offshore standards (for example, 10−4 per operation as specified by DNV-GL). However, one of the main limitations is that these curves do not reflect site-specific safety assessment. The current paper presents a novel methodology for assessing the structural safety level of marine operations from a long-term perspective. The methodology includes estimation of extreme response distribution under all possible operational sea states (i.e. the operational domain under the limiting sea states) for a given offshore site and is compared to the response limit to obtain an average failure probability. A case study is also presented for a blade root mating process onto preassembled hub using a jack-up crane vessel and risk of impact between root and hub is considered critical. Global time-domain simulations are performed using multibody dynamics, and extreme value distributions for impact velocities are derived for different wind-wave conditions. The allowable impact velocity between the blade root and the hub is determined by an explicit finite element analysis of the damage at the blade root. Finally, the average failure probabilities considering the operational domain are obtained for four different European offshore sites and are compared to the target level of structural failure probability considered for the limiting sea states.

Structural Failures of Bulk Carriers

1995 ◽  
Vol 209 (2) ◽  
pp. 83-91 ◽  
Author(s):  
J Jubb
Keyword(s):  
Structural Failure ◽  
Bulk Carrier ◽  
Detail Design ◽  
The Pacific ◽  
Local Stresses ◽  
Bulk Carriers ◽  
The Pacific Ocean ◽  
Structural Failures ◽  
Deck Cracks

Structural failures of bulk carriers continue at a steady and unacceptable rate, claiming some 150 lives per year. This paper explains why bulk carriers are vulnerable to structural failure either because side shell plating falls out allowing ingress of seawater or the deck cracks open. Inadequate detail design, material without guaranteed fracture toughness and limitations of current inspection programmes are identified as fundamental weaknesses. The paper includes important information from a case study of six oil bulk ore carriers prone to deck cracking. One of the group of six which sank in 1980 was traced 4200 metres down on the floor of the Pacific Ocean in June 1994 and the results of this initial search are reviewed. There is a genuine need to go back to basics. Designing from first principles to determine local stresses is an important first step rather than the current use of prescriptive rules. All subsequent steps in bulk carrier construction and maintenance should be subject to a penetrating review.

Damage, Vulnerability and Retrofitting Strategies for the Molise Hospital System following the 2002 Molise, Italy, Earthquake

2004 ◽  
Vol 20 (1_suppl) ◽  
pp. 285-299 ◽  
Author(s):  
Camillo Nuti ◽  
Silvia Santini ◽  
Ivo Vanzi
Keyword(s):  
Structural Damage ◽  
Southern Italy ◽  
Structural Type ◽  
Structural Failure ◽  
Hospital System ◽  
Emergency Operations ◽  
Almost All ◽  
Detailed Picture ◽  
Community Decision

The earthquake of October 31, 2002, inflicted moderate damage on the region of Molise in southern Italy. However, it attracted much attention because almost all the victims were children killed in the structural failure of their primary school. This paper focuses on a different, but equally important, structural type: hospitals. The earthquake left them largely untouched. In the paper we first give a detailed picture of the structural damage and of the organization of emergency operations. Then we try to give guidance about the most effective retrofitting strategies for the regional hospital system as a whole, following a methodology developed in Nuti and Vanzi (1998b), which has been adjusted for this case study. Depending on the community decision criteria, the hospitals of Campobasso and Bojano appear to have the highest priority for retrofitting, even though they were unscathed by the event.

scholarly journals Structural Failure Analysis of Building E ITERA Due to The Pounding Effect with Non-Linear Time History

2020 ◽  
Vol 20 (01) ◽  
pp. 35-46
Author(s):  
Nugraha Bintang Wirawan ◽  
Siska Apriwelni
Keyword(s):  
Linear Time ◽  
Response Spectrum ◽  
Time History ◽  
Structural Failure ◽  
Loma Prieta Earthquake ◽  
Adjacent Buildings ◽  
Earthquake Record ◽  
Earthquake Load ◽  
High Level

[EN] Lampung, a province where Institut Teknologi Sumatera (ITERA) is located, is an area that has a high level of seismicity. This research takes a case study of the Building E ITERA which has a dilatation building concept. Due to dilatation, inter-buildings have the risk of collisions because of earthquake loads. The purpose of this study is to determine the value of joint displacement in adjacent buildings when given a dynamic load of Time History and determine whether the adjacent buildings experience a pounding effect. A Time History earthquake load data that has been matched with the Lampung region response spectrum by software is applied to the model of Building E. Building E is modeled according to the as built drawing data and the results of field checking. Structure is analyzed using software. The results of the study showed that the structure of the Building E which was loaded by Loma Prieta earthquake that has been matched would experience inter-building collisions. Further research using earthquake record data taken in areas within certain radius from ITERA is need to be conducted to obtain more accurate results.

Sign in / Sign up

Export Citation Format

Share Document