Iris Publishers Civil Engineering Open Access Journals

  Mini Review In view of ever-increasing environmental and climate problems, a sustainable approach to dealing with the world’s resources is indeed being discussed, but the focus is placed primarily on the conservation of physical resources and much less on the reuse of intangible, non-reproducible cultural resources. In architecture, however, recycling cannot be reduced to atoms because both material and immaterial values are embodied within residual building mass [1]. When designing, reuse entails working and building with the past and its meaning for today. The more we understand the existing, “the less we must stand in opposition to it,” says Hermann Czech, “and the easier it will be to understand our decisions as a continuation of a whole” [2]. As a clever recycling of semiotics and both history and narratives, spoliation and assemblage are, according to our thesis, capable of expanding the principle of reuse and repurposing from the level of materiality to immaterial values, ...

  Abstract Project monitoring and control processes are crucial aspects of project management. To perform an appropriate project tracking, Earned Value Analysis (EVA) has to be implemented to help the project managers to measure project performances. A tool to monitor and control the cost, time and work done of a construction project. Furthermore, it also provides an “Early Warning” signal for immediate corrective action. Thereby, in this study, some work items related to a completed real life construction project were evaluated according to the method of Earned Value and the result implies that the analysis can be very useful in project forecasting and decision making relevant to early warnings. Read More about this article: https://irispublishers.com/ctcse/fulltext/project-monitoring-and-early-warning-of-time-cost-overruns-in-earned-value-management.ID.000673.php Read More about Iris Publishers Google scholar Articles : https://scholar.google.com/citations?view_op=vie...

  Abstract To obtain a tensile strain-hardening behavior by using the ordinary polypropylene (PP) fiber, the micromechanical model recommends the increase of the fiber low interfacial bond with an ordinary cementitious matrix. It was predicted that the alkali-activated slag (AAS) composite high drying shrinkage performance would affect the fiber interface frictional bond during the pullout. Generally, twenty different PP fiber reinforced AAS composites with drastically different material properties were obtained in this research. In order to alter the drying shrinkage performance of the composites, two different curing methods, namely, heat-treatment and laboratory temperature, were applied to the developed specimens. All examined composites showed a deflection-hardening response in flexure; for most of them, the flexural strength was significantly increased from the cracking strength and the responses were similar to flexural response of a strain-hardening cementitious composite (...

  Abstract Aging and decay of transportation facilities, and the higher long-term cost of passive maintenance has led to the need for development of proactive management systems for bridge maintenance, repair and rehabilitation. This paper proposes a framework for Bridge Decision Support Framework (BDSF) as a form of proactive asset management system. A BDSF allows the asset manager to perform economic analyses on a bridge in order to establish priorities and make preliminary selection of preservation, repair or rehabilitation options. Among various bridge systems, segmental bridges using internal and external post-tensioning have faced great challenges due to issues related to the durability of the posttensioning tendons. Although some reserve capacity has been designed into these bridges, failure of tendons can have profound effect in the safety and structural integrity. These experiences have stressed the need for a proactive and predictive BDSF. A major component of such system...

  Abstract To minimize earthquake-induced damages in structures, one of the most reliable ways to design and construct earthquake-resistant buildings is to utilize reinforced concrete shear walls because they increase the structural resistance to lateral loads and effectively stiffens and strengthens the structure. This is known as the best seismic-resistant design method that ensures the stability of multi-story buildings against lateral forces when subjected to strong earthquakes. This paper investigates the effects of the shear wall location in a typical low-rise building to improve earthquake resistance. The study initially models a five-story reinforced concrete structure without shear walls and then adds shear walls at different locations in the structure. SAP2000 is used to perform dynamic analysis under the 1994 Northridge earthquake, an example of severe seismic excitation. Response modal nonlinear time-history dynamic analysis is utilized to obtain an accurate representat...

  Abstract The planning process is imperative for the construction industry as a management tool for building and residential construction firms. Effective planning procedures coordinate, monitor and guide processes for enhanced outcomes. Unfortunately, inadequate planning or no coherent outlining is the reality for most Brazilian companies in the construction sector, i.e. the Architecture, Engineering and Construction (AEC) sector. This article aims to review a set of practical models for better planning and controlling for vertical building construction focusing on currently available software in the local market. By examining these techniques this article also intends to disseminate awareness regarding current concerns in the industry. Read More about this article:  https://irispublishers.com/ctcse/fulltext/application-of-management-and-control-techniques-in-brazilian-construction-industry.ID.000545.php Read More about Iris Publishers Google scholar Articles :  https...

  Abstract The construction of facilities in cramped conditions requires a special approach to the need to develop and implement measures to ensure the safe operation of the buildings surrounding the building within the limits of geotechnical influence. Builders often neglect the impact of the new facility technology on the possible negative effects (cracks on facades due to uneven precipitation, heels, etc.) of the buildings in use. The term «minimum price» is still used when part of a building is erected below zero. This approach completely disregards the notion of «technical utility». At the same time the builders go to any tricks to reduce the cost. This «irrational» way of construction may eventually result in a substantial increase in the cost of constructing a zero part of a building and, as a general rule, in a longer construction period (agreement on a new project as a result of substitution of another geotechnical technology, passing of new construction expertise). This a...

  Abstract The high consumption of energy became a danger constitutes to the environment and increases the monthly consumer costs. This leads to the think for some alternative materials that can helps us to avoid these problems. The objective of this study is to measure the effectiveness of thermal insulated concrete blocks in Oman. Study of this kind of blocks have many values and in order to evaluate the results compared with nonthermal insulated concrete blocks. This report is summarized, study the energy consumption, environment-impact and measure the consumer satisfaction for the usage of thermal insulated concrete blocks. The results indicated that the thermal insulated blocks) has a good strength and it shows high efficiency of insulation more than 50 percent compared to (normal blocks). In addition, it helps to save energy consumption and protect the environment. In conclusion it was proved that the (thermal insulated blocks) is the most appropriate choice for the building ...

  Abstract The quality problems encountered in concrete structures appear at different stages of the construction of works, it is for this reason that for a long time there has been an increased demand for more precise and, at the same time, more flexible methods of concrete quality assessment. This paper presents some notions concerning the Schmidt rebound hammer test which is one of the non-destructive methods most used for the recognition of the condition of building structures. This test is quick and easy, it makes it possible to control the quality of the construction and to indirectly measure the compressive strength of concrete in situ. The rebound hammer calibration procedure was detailed on an example by presenting the different steps. The influence of several factors affecting the rebound hammer test, whether related to the properties of concrete or otherwise, was were presented. Indeed, Surface texture, concrete humidity, type of aggregates, cement type and carbonation o...

  Iris Publishers- Peer Review Journal of Civil and Structural Engineering Fundamentals for Cracking Verification of Reinforced Concrete Structures Abstract A mathematical model, named as general method, has been set up to study the cracking behaviour of a concrete tie reinforced by ordinary bars, subjected to a monotonic load. The analysis is performed considering both the crack formation stage and the stabilized cracking stage. In particular, secondary cracks occur in the stabilized cracking stage, modifying the distribution of bond stress along the transmission length. As in the stabilized cracking stage the solution of the general method requires to carry out an iterative numerical procedure, for design purposes the maximum crack width can be determined through a simplified method that allows the main aspects of the structural behaviour to be taken into account. Introduction Cracking in concrete structures has to be considered normal and, in general, it does not indicate a...

 Iris Publishers - Open Access Journal of Civil and Structural Engineering Modern and Future Issues facing Civil Engineering and Construction Abstract The world of construction and civil engineering faces many broad issues in today’s climate. These issues affect areas such as road, bridge, rail, ship, general building construction, as well as oil and gas projects, tunnels, dams and wind farms. The civil engineering profession involves a lot of sub- disciplines and deals with the infrastructure and maintenance of built environments. As civil engineers there is a social responsibility to maintain and adapt structures to make life manageable. In this brief article we aim to highlight some of the most pressing issues that are occurring, and we offer some solutions and thoughts. Keywords: Civil engineering; Challenges; Infrastructure; Community; Sustainable; Safety; Management; Pandemic; Covid-19 Introduction There are a lot of pressures on civil engineers these days, and in order to su...

  Iris Publishers - Journal of Civil and Structural Engineering Computational Examination of Aerodynamics Forces and Evolution of Vortex Shedding of Flow Past Three Square Cylinders at Two Symmetrical Vee Shapes Abstract The flow past three square cylinders at two symmetrical vee shapes has been investigated by a finite-volume method numerical technique. The two-dimensional computations have been performed for different Reynolds number (Re) ranging from 1 to 180 in order to consider different flow regimes; the steady, the periodic and the turbulent flow. The validation of the code with the available literature results regarded both the reliability of the computed solutions and the overall resulting efficiency of the methods. Velocity profiles, vorticity contours and integral parameters such as Strouhal number, drag and lift coefficients have been presented and analyzed. Steady and unsteady regimes of flow have been observed by monotonously changing the Re value, leading to the pred...