M. Nehdi

... How-ever, results of tests carried out by Ali et al. (1993), and Fatuhi and Clark (1996) indicate the opposite trend. All results (Khatib and Bayomy 1999; Ali et al. ... 4). To achieve enhanced NEHDI AND KHAN ON RECYCLED TIRE RUBBER 5 FIG. ...

... View all references) on concentric bracing, and Shahin et al. (199844. Shahin, T., Osman, A. and Sadek, AW . Seismic upgrading of gravity-designed concrete frames using steel bracing. Proceedings of the Eleventh European Conference on Earthquake Engineering. ...

... 89 - 94. M. Nehdi ,A. Tariq. (2007) Stabilization of sulphidic mine tailings for prevention of metal release and acid drainage using cementitious materials: a review. ... (1993) Concrete: Structures, Properties, and Materials. A. Kurdi ,A. Awad ,M. Kassim ,M. El-Zaafraney. ...

... All tested beams were simply supported. ... slip along diagonal tension cracks in short beams can be less significant due to the development of wider ... Table 4 Experimental results and comparison with predictions of existing strut-and-tie models and the model using the proposed ...

The cost of repairs to leaky condominiums in southwestern British Columbia (BC) has been estimated at one billion dollars. Stakeholders have been actively trying to address the problem. Providing a drainage cavity (rain-screen) in wall claddings is emerging as the promising solution to offer a second line of defense against moisture ingress and is currently advocated by municipal authorities, designers and manufacturers of building envelope systems. However, it is not yet clear which assembly of materials will provide an optimal solution or what size of drainage cavity should be used. Designers do not agree on whether the cavity should be pressure equalized, pressure moderated or vented and to what extent. The effects that the cavity will have on the drying and energy efficiency of walls also remain open questions. Since stucco has been a major cladding material in BC, extensive research to design an effective drainage cavity stucco cladding system was carried out. A detailed computer study using the “MOIST 3.0” computer model was conducted to analyze the moisture and heat transfer in a new drainage cavity system versus a conventional stucco wall. The ASHRAE WYEC hourly weather data for the city of Vancouver along with the variable indoor relative humidity model were used as input. Results show superior characteristics of the proposed drainage cavity cladding system. Several residential projects, including multifamily buildings, have been constructed using the new rain-screen system, which is exhibiting good performance.

ABSTRACT To calculate the shear capacity of structural members reinforced with fiber-reinforced polymer (FRP), current shear design provisions generally use slightly modified versions of existing semiempirical shear design equations initially developed for steel reinforced concrete beams. Such methods generally assume that the traditional approach of superimposing concrete contribution to shear, Vc to that of stirrups, Vs can also be used to calculate the nominal shear capacity, Vn of FRP-reinforced concrete beams provided that the axial rigidity of FRP longitudinal bars and the capacity of FRP stirrups at the bent portions are accounted for. These methods also noticeably vary in the manner they account for the effect of basic shear design parameters on shear strength. This paper presents simple yet improved equations to calculate the shear capacity of FRP-reinforced concrete beams based on the genetic algorithms approach. The performance of the proposed equations is compared to that of four commonly used shear design methods for FRP-reinforced concrete beams, namely the ACI 440, CSA S806, JSCE, and ISIS Canada. Results show that current guidelines are either inadequate or very conservative in estimating the shear strength of FRP-reinforced concrete beams. Moreover, the shear capacity of FRP-reinforced concrete beams calculated using the proposed equations is in better agreement with available experimental data than that calculated using shear equations provided by current provisions. This study also shows that the axial rigidity of FRP longitudinal bars is best represented by a cubic root function and that the contribution of FRP stirrups to shear strength is a square root function of the stirrups ultimate capacity rather than a linear function as proposed by current shear provisions.

[Journal of Composites for Construction 9, 274 (2005)]. M. Sakr, MH El Naggar, M.ASCE, M. Nehdi. Abstract. ... Geoenviron. Eng., 125(8), 633–640. FukushimaS., and TatsoukaF. (1982). “Deformation and strength of sand in torsional simple shear.” Proc., IUTAM Conf. ...

... previously used in several other applications including food, catalyst and mineral processing, gas scrubbing ... particles is held in cyclonic motion in a high-velocity processing air stream ... The advantages of this RHA production technology over circulating fluidized beds include a ...

While there is abundant research information on ordinary concrete confined in FRP tubes, there is little data on the behavior of self-consolidating concrete (SCC) under such condition. Because of the usually higher total shrinkage and lower coarse aggregate content of SCC compared to that of ordinary concrete, its composite performance under confined conditions needs special investigation. SCC confined in FRP

... AI was used to optimize the design of industrial roofs (Ramasamy and Rajasekaran 1996), con-struct an empirical model of the shear strength of reinforced concrete beams (Ashour et al. 2003), design mixture proper-ties of high-strength concrete (Lim et al. ...