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Journal Cover   Concrete Research Letters
  [4 followers]  Follow
    
  This is an Open Access Journal Open Access journal
   ISSN (Print) 2180-1371
   Published by ISSR Journals Homepage  [3 journals]
  • Experimental and FE simulations of Ferrocement Domes Reinforced with
           Composite Materials

    • Authors: Yousry Shaheen, boshra aboulanen eltaly, Amany Hanesh
      Abstract: The main objective of the current researches is estimating the structure performance of ferrocement domes reinforced with composite material. The current paper presented an experimental program included casting and testing up to failure four ferrocement domes. All specimens have 1000mm diameter and 500mm height; respectively and they were reinforced with welded wire meshes (for the first and second dome), fiberglass meshes (for the third dome) and polyethylene wire meshes (for the fourth dome). The second dome is the same as the first dome except that the second dome has two opening with 100x100mm dimensions to indicate the effect of the opening in the structure behavior of ferrocement dome. Also FE simulations for all tested domes were employed. The results of the experimental program indicated that the dome reinforced with fiberglass mesh has the highest service load and ultimate load and the dome reinforced with welded wire meshes achieved highest ductility ratio and energy absorption. Additionally comparing the results of FE simulations with the experimental results showed that the results of FE simulation is closed the experimental results.   
      PubDate: 2015-01-31
      Issue No: Vol. 5 (2015)
       
  • Fundamental time period of RC Setback Buildings

    • Authors: S Varadharajan, V K Sehgal, B Saini
      Abstract: The buildings with the presence of setback irregularity are now being increasingly used in the urban areas. The present work proposes an irregularity index for quantifying the setback irregularity based on the dynamic characteristics of the buildings. This paper also proposes a modified equation for the fundamental period of vibration, for building frames with setback irregularity. Furthermore, the equations for estimating the maximum inter storey drift ratio (Ir) and maximum displacement ductility (μmax) are also proposed. These equations are proposed on basis of the regression analysis conducted on the seismic response databank of 305 building models with different types of setback irregularity for each height category. The proposed equations are represented as a function of the irregularity index, and are validated for 2D and 3D building models with setback irregularity.    
      PubDate: 2015-01-31
      Issue No: Vol. 5 (2015)
       
  • Economic Service Life of RC Structure Based on Corrosion Initiation Time

    • Authors: Md. Shafiqul ISLAM
      Abstract: Target service life of the structure specified by the codes and standards for RC infrastructures has failed to achieve due to uncertainties at the time of construction of structure and at exposure to real environment. Moreover, the more resistivity of the cover concrete, the larger is the service life and thus higher is the cost incurred by the owner. Therefore, economic service life (ESL) has more value than considering engineering service life, where both the failure and the cost consider parallel in the prediction of service life. A statistical model to determine the time to initiate corrosion due to chloride attack to the RC member and subsequent repair considering all costs incorporated is taken into account in this research. Cost minimization model is used to calculate economic service life where initial cost, repair cost and gain from revenue for the structure are paid attention. Further, a correlation between corrosion initiation time (CIT) and economic service life (ESL) is proposed.
      PubDate: 2015-01-31
      Issue No: Vol. 5 (2015)
       
 
 
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