scholarly journals New Ashton Arch – functional assessment of direct and indirect construction costs and evaluation of service life with respect to flooding risk.

2018 ◽  
Vol 199 ◽  
pp. 06003
Author(s):  
Philip Ronné ◽  
Abe Newmark ◽  
Nadri du Toit ◽  
Heinrich van Wijk
Keyword(s):  
Service Life ◽  
Flood Damage ◽  
Local Economy ◽  
Functional Evaluation ◽  
Structural Form ◽  
Construction Costs ◽  
Improvement Project ◽  
Arch Bridge ◽  
Flooding Risk ◽  
Bridge Crossing

The bridge crossing the Cogmanskloof River in the town of Ashton, South Africa, had a history of over-topping due to severe flood events. The poor flood resilience of the bridge was aggravated by the generally hydraulically inefficient openings, the number of substructure supports in the river course, and a high debris load during flooding. The strategically important tourist route had to be closed, while localized flood damage repairs were undertaken, with resultant adverse effects on the local economy. As part of a road safety improvement project between the towns of Ashton and Montagu, improvement of the flooding resistance at the Ashton river bridge was required. This paper documents the functional evaluation of economicand technical-assessments of the flooding risks for the existing retro-fitted bridge. A new tied-arch bridge was the selected structural form of the replacement structure – based on the assessment of the key service life and constructability criteria. The structural form of the Ashton Arch paid careful regard to the scenic location and historic character of the previous multiple arch bridge form.

Bridge over the Vistula river in Toruń (Poland)

2019 ◽  
Author(s):  
Krzysztof Wachalski
Keyword(s):  
Horizontal Force ◽  
Original Solution ◽  
River Bank ◽  
Arch Bridge ◽  
Vistula River ◽  
Bridge Crossing ◽  
Slide Material ◽  
Structural Scale ◽  
Engineering Projects ◽  
The Eu

<p>The construction of the arch bridge in Toruń was one of the greatest and more spectacular engineering projects implemented during the recent years. In December 2013 the Poland’s largest arch bridge was completed and opened. The bridge has two spans, 270m long each, and is used as a bridge crossing over the Vistula river (Fig.1). The bridge is over 1.9 km long counting the access overbridges (viaducts). The erection procedure of the bridge was unique and individual, as the structural scale suggests. Generally, the assembly covered junction of arch elements on the assembly site near the Vistula river bank and the pontoon water transport of arch girders, which were settled on the arch abutments. A unique affordable structural solution deals with the support footing of a great number of small concrete pre-cast piles transferring a giant horizontal force into the subsoil. The steel-arch is modeled by a hingeless system without a tie, transferring horizontal force into supports. A original solution of assembly geometry control system and monitoring system was applicate to floating erection. Innovation was done of introducing material for the pot bearings, whose durability was 5-times longer than the ordinary ones. A novel slide material PTFE was used, the so-called grey teflon of improved abrasion ability. The new PTFE solutions were recently applied for the spherical bearings, but never they have been for the pot bearings. The bearings worked out an individual product specification, based on experiments conducted in the EU laboratory. The world's pioneering enterprise is application of a hundred pot bearings for the bridge and viaducts.</p>

Reconstruction of the Historic Bridge Located in Portz Insel

2020 ◽  
Vol 868 ◽  
pp. 159-165
Author(s):  
Denisa Boháčová ◽  
Eva Burgetová
Keyword(s):  
Service Life ◽  
Bridge Deck ◽  
Bridge Structure ◽  
Arch Bridge ◽  
Original Frame

The paper presents a structural survey of the arch bridge from the 17th century located in Portz Insel near Mikulov. The purpose of the research was to analyze service life and reliability of the bridge structure including long-term functional durability. There were performed probes in order to search for the original frame foundation and defining a shape of particular arches buried in the ground for decades. The probes also helped to check up the structure of the bridge deck in several places. Currently, throughout 2019 and 2020, the bridge will undergo major reconstruction work in the context of the project „Mikulov, Portz Insel – restructuralisation of the historic countryside“.

Optimality and Acceptance Criteria in Offshore Design

2002 ◽  
Author(s):  
Oliver Ku¨bler ◽  
Michael Havbro Faber
Keyword(s):  
Optimal Design ◽  
Service Life ◽  
Net Present Value ◽  
Steel Structures ◽  
Offshore Structures ◽  
Theoretical Problem ◽  
Offshore Structure ◽  
Construction Costs ◽  
Suggested Approach ◽  
Wide Range

The optimal design of offshore structures is formulated as a decision theoretical problem. The objective is to maximize the net present value of the service life benefit. The general optimization problem is simplified by taking into account the cost impacts of only one possible reconstruction of the structure. The analytical solution to this problem has been derived for the case, where failure events follow a stationary Poisson process. The service life benefit is formulated in terms of the production profile, the design and construction costs, the costs of failure and the costs of reconstruction. In order to assess the effect of potential loss of lives, the costs of fatalities are included applying the concept of the Imp lied Costs of Averting a Fatality (ICAF). The suggested approach to optimal design, which can be applied for any type of offshore structure, is exemplified considering the special case of steel structures. Here it is standard to represent the ultimate structural capacity in terms of the Reserve Strength Ratio (RSR). For the purpose of illustration, the relation between material usage and RSR valid for monopod structures is applied. Optimal RSR’s and annual failure rates are assessed for both manned and un-manned structures covering a wide range of different realistic ratios between the potential income and costs of construction, failure and re construction costs.

scholarly journals Comparison of Microbially Induced Healing Solutions for Crack Repairs of Cement-Based Infrastructure

2021 ◽  
Vol 13 (8) ◽  
pp. 4287
Author(s):  
John Milan van der Bergh ◽  
Bojan Miljević ◽  
Snežana Vučetić ◽  
Olja Šovljanski ◽  
Siniša Markov ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Service Life ◽  
Cementitious Materials ◽  
Bacterial Suspension ◽  
Self Healing ◽  
Construction Costs ◽  
Recovery Processes ◽  
Concrete Crack ◽  
Crack Repair ◽  
Water Absorption Test

Reinforced concrete crack repair and maintenance costs are around 84% to 125% higher than construction costs, which emphasises the need to increase the infrastructure service life. Prolongation of the designed service life of concrete structures can have significant economic and ecological benefits by minimising the maintenance actions and related increase of carbon and energy expenditure, making it more sustainable. Different mechanisms such as diffusion, permeation and capillary action are responsible for the transport of fluids inside the concrete, which can impact on the structure service life. This paper presents data on microbially induced repair and self-healing solutions for cementitious materials available in the contemporary literature and compares results of compressive strength test and capillary water absorption test, which are relevant to their sealing and mechanical characteristics. The results of the repair and self-healing solutions (relative to unassisted recovery processes) were “normalized.” Externally applied bacteria-based solutions can improve the compressive strength of cementitious materials from 13% to 27%. The internal solution based solely on bacterial suspension had 19% improvement efficacy. Results also show that “hybrid” solutions, based on both bio-based and non-bio-based components, whether externally or internally applied, have the potential for best repair results, synergistically combining their benefits.

scholarly journals Evaluation of Economic Impacts from Flood Damages Using Hybrid Input-Output Analysis

2020 ◽  
Author(s):  
Cholapat Jongdeepaisal ◽  
Kohei Yoshimura ◽  
Seigo Nasu
Keyword(s):  
Flood Damage ◽  
Local Economy ◽  
Economic Effects ◽  
Residential Areas ◽  
Output Analysis ◽  
Goods And Services ◽  
Negative Effect ◽  
Flood Damages ◽  
Two Stages ◽  
Kochi Prefecture

Abstract. Flooding is a common issue in many countries and can cause extensive damage to residential areas, agricultural and livestock areas, and public facilities. These damages impact the local economy directly and create unexpected demand for goods and services. The consequences of flood damage are marked by the ambiguity of how it changes the production of local economies. For this reason, our study implements the use of the hybrid I-O analysis to evaluate the economic effects of flood damages. The flooding scenario in Kochi prefecture, Japan simulated from the inundation model was selected to demonstrate the analysis. The influences of flood damages were divided into two stages, the garbage cleaning stage and the reconstructing stage; these two stages lead to the different scenarios based on the different activities. It was found that in total, flood damages could stimulate economic growth when the positive effect of reconstruction activities surpass the negative effect of garbage cleaning activities.

scholarly journals Influence of Microtopography and Alluvial Lowland Characteristics on Location and Development of Residential Areas in the Kuji River Basin of Japan

2019 ◽  
Vol 12 (1) ◽  
pp. 65
Author(s):  
Rei Itsukushima ◽  
Kazuaki Ohtsuki ◽  
Tatsuro Sato
Keyword(s):  
River Basin ◽  
Land Development ◽  
Flood Plain ◽  
Flood Damage ◽  
Fundamental Aspect ◽  
Third Century ◽  
Residential Areas ◽  
Building Density ◽  
The Third ◽  
Flooding Risk

Adopting a comprehensive, basin-wide method for preventing flood disasters would be effective to deflect the climate-change-induced intensified water-related disasters. This study considers the land use and settlement patterns based on microtopography and flood risks. The influence of the microtopography and alluvial lowland characteristics on the location and development of residential areas in the Kuji River basin, Japan, is a fundamental aspect of historical knowledge. Investigating the relation between the microtopography and the location of antiquities shows that most of the relics dating to or before the third century were situated in the terraces near the lowlands. The development of lowlands near the mainstream of the Kuji River began around the third century. Furthermore, the relation between the microtopography and development of residential areas is investigated using building density as the development indicator. The results confirm the increase in building density in the alluvial surface, proving a history of flood damage and delayed development compared to other regions. This investigation reveals land development in areas, including the former river bed on the mouth of the Kuji River and the flood plain on the margins of the Hitachiota urban distinct, with no confirmed inhabitation before modern times because of elevated flooding risk.

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