Iris Publishers Civil Engineering Open Access Journals

 Abstract This article describes the process of design, analysis, and manufacture of a modular, adaptable, and lightweight folding Bamboo dome. The study developed a new form-finding method with rigid scissors to simulated complex geometric forms to show rigid-bar deformation and using more uniform bars. The structure is composed of six flat semi-arches that fold through the scissor-type system reducing the size of the dome to facilitate is transport. Bamboo bars with a circular section are used as a main material for the structural arches. This research has been contextualized in the development and the form-finding process of curved surfaces with articulated bars. Félix Escrig’s projects have been utilized as the main reference, in particular, his method based on the regular polyhedron’s geometry, which allows obtaining the largest number of similar pieces. For this case study, a new approach to the regular polygon method is applied in the design process. The new methodology allo...

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  Abstract This paper analyzes and compares the responses of a two-storied steel structure to the 1994 Northridge earthquake in California. Response modal nonlinear time-history dynamic analysis was especially used on the structure with fixed-base and base-isolated systems to show the realistic behavior of the structure. Intuitively, the best choice for the seismic isolation technique is the use of the flexible element, or an isolator, at the structure’s base, which ensures damping. The current research analyzed in depth the application of a base isolator in the structure. In this study, one structure with different support systems was analyzed to investigate the use of base isolation. The research compared the features and performance of a structure with and without base isolation. The steel building was analyzed subjected to earthquake-induced load with and without a base-isolated rubber bearing. The building was modeled by SAP2000 for nonlinear time-history analysis. Ground-moti...

  Abstract A study on the effects of blast loads on tower-line coupling, single tower structure and tower-line structure system has been conducted and a variety of structural response variables have been compared. The modular and powerful finite element analysis software Dlubal- RFEM has been utilized for the blast-oriented linear implicit dynamic analysis of latticed transmission line structures covered in this study. The transient dynamic equilibrium equations of the tower have been directly solved by Newmark time integration method. Several study models from this work have indicated that there is up to nearly four-fold increase in support forces in uncoupled systems which subsequently greatly influence the planning, selection, design and detailing of support systems for such structures. Read More about this article: https://irispublishers.com/ctcse/fulltext/response-of-coupled-power-transmission-tower-line-systems-subjected-to-blast-loads.ID.000684.php Read More about Iri...

  Abstract The vertical component of ground motions is known to cause severe damages to certain structures. Long span cable-stayed bridges are among those vulnerable structures due to their high mass and cables that take no compression. In this paper, the vertical earthquake effects on several cable-stayed bridges have been investigated using 3-D nonlinear time history finite element analyses. Different main span lengths, pylon shapes and pylon/deck connection types are considered. The results indicates that the vertical ground motion component should be considered in the analysis of such bridges and affects many key elements of the bridge. Read More about this article: https://irispublishers.com/ctcse/fulltext/effects-of-vertical-component-of-earthquakes-on-cable-stayed-bridges.ID.000685.php Read More about Iris Publishers Google scholar Articles : https://scholar.google.com/citations?view_op=view_citation&hl=en&user=LoZ6uCQAAAAJ&cstart=20&pagesize=80...

  Abstract The problem of increasing the bearing capacity of foundations is always an urgent problem in modern geotechnical construction. With additional increased external loads on existing restraint structures, the use of traditional technologies to ensure their stability is not always justified. Often there is an urgent need to use non-standard methods of strengthening the bases. There are frequent cases of using existing retaining reinforced concrete structures for new additional loads from newly erected objects. In such cases, the use of ERT drill piles and soil ERT anchors in most cases successfully solves many complex geotechnical problems of strengthening overloaded bases. Read More about this article: https://irispublishers.com/ctcse/fulltext/the-case-of-strengthening-the-base-of-a-deformed-retaining-wall.ID.000686.php Read More about Iris Publishers Google scholar Articles : https://scholar.google.com/citations?view_op=view_citation&hl=en&user=LoZ6uCQA...

  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 (...