Issue 1: Jan.-June 2024

Mohammad Hossain Jalal Kamali, Abolfazl Hassani, Reza Jalalkamali, Seyed Jafar Hejazi

Abstract:Concrete pavements are increasingly gaining global traction, Iran included, driven by the distinctive attributes inherent in concrete, notably its durability and strength. The need for meticulous rehabilitation of vehicular bridges in instances of pavement deterioration underscores the suitability of concrete pavements for such applications. Consequently, the escalating preference for concrete pavements has heightened concerns regarding their safety to an unprecedented extent. A critical factor affecting the safety of concrete pavements is surface friction. Traffic loading over time results in the surface micro and macro texture deterioration, reducing the coefficient of friction of pavement, which is a matter of safety. In this study the abrasion of five different macro textures (and non-textured concrete as a control sample), subjected to an abrasion test using a Rotational Abrasion Device, has been measured and related to macro texture type, loading amount, and loading speed and repetition, as independent variables in a linear regression model. The results show that the macro texture type has a great impact on the abrasion of the concrete surface. The grooved and non-textured concrete surfaces had the highest and lowest abrasion, respectively. When comparing the effects of the various load characteristics, loading repetition is around 45% more influential than the applied load. In addition, the findings showed that the loading speed has an inverse influence on the amount of abrasion, which means that the amount of abrasion is reduced when the loading speed is increased.

International Journal of Bridge Engineering, Vol. 12, No. 1, 2024: pp. 1-13

Haitham Abd-Elrahman Mansoor Taha, Osama Mohammed Elmardi Suleiman Khayal

Abstract:In this research, the air intake and exhaust systems in internal combustion deck's engine are investigated and the volumetric efficiency as a major impact on effective power of deck's engine is studied comprehensively and thoroughly. Some of the parameters affecting the volumetric efficiency were studied such as air pressure, air temperature, compression ratio, residual gas pressure, variation of temperature, compressor temperature and fuel air ratio individually. This was done through the aid of computer program using the MATLAB environment. The effects of those parameters were varying on the volumetric efficiency, where air pressure, air temperature and compressor temperature were having a proportional effect on the volumetric efficiency and effective power. On the other hand, the compression ratio, variation of temperature, residual gas pressure and fuel air ratio were having an inverse effect. As conclusion, the maximum value of volumetric efficiency (86%) and the corresponding effective power was attained due to the effect of compressor temperature. The minimum value of volumetric efficiency was (62%) due to the effect of increasing the fuel air ratio.

International Journal of Bridge Engineering, Vol. 12, No. 1, 2024: pp. 15-42

Vinay Kumar Singh, Suraj Singh

Abstract:Now a day, construction of cable stayed bridges is increases exponentially; this is because of the distinctive and beautiful aesthetic quality of the structure. Two crucial parameters are examined in the presented manuscript. First, the shape of pylon and their respective performances for H-shape, A-shape, and Y shapes pylons and second, the impact of altering the deck width and span for different shapes of pylons. Both the above cases are analyzed after being exposed to static load, dynamic load as well as for earthquake load (time history analysis for El Centro).This investigation is being carried out by use of the Finite Element Method through MIDAS package. This computational tool conducts a sensitivity analysis of cable bridges. Fan type arrangements of the cables are to be considered in this paper. In the manuscript it is examined that the static loading has a key role in the design and analysis of cable stayed bridges. The best initial pre-stress forces in cables are determined using the unknown load factor approach. The displacement, reactions, stresses, cables force, shear force, bending moments resulting from various loading scenarios, mode shapes, displacements resulting from El Centro time history, and relative displacements resulting from various damping coefficients are among the response quantities of interest. As the damping coefficient increases there is a change in relative displacement of the bridge which is to be recorded in this paper. And finally, we concluded that the most efficient shape for different load cases are H-shape pylon followed by Y-shape pylons and then A-shapes pylon. The worst effects are in inverse Y-D and A-D designs because rigidity have been decreased in this specimen’s models.

International Journal of Bridge Engineering, Vol. 12, No. 1, 2024: pp. 43-64

Haitham Abd-Elrahman Mansoor Taha, Osama Mohammed Elmardi Suleiman Khayal

Abstract:In this review research, the air intake and exhaust systems in internal combustion deck's engine are investigated and studied from the considerations of Introduction; Theoretical Background which includes: Introduction, Gas Exchange Processes, Quasi Static Effects – Volumetric Efficiency of an Ideal Cycle, Effect of Fuel Composition, Phase, and Fuel / Air Ratio, Combined Quasi – Static and Dynamic Effects, Frictional Losses, Ram Effect, Variation with Speed, and Valve Area, Lift and Timing, Exhaust Gas Flow Rate and Temperature Variation, Diesel Engine, Volumetric Efficiency, Air Path. The Literatures Review are discussed from the following viewpoints: Air and Fuel Induction, Exhaust flow, Air System, Turbo Charging System, Turbo Charged Diesel Engine Models, Methods of Power Boosting, Supercharging of Diesel Engine, Diesel-Engine Compression Ratio, Performance of Supercharged Diesel Engines, Compressor and Turbine, Intercooler, Intake Manifold, Combustion and Torque Production, Exhaust Manifold, Effect of Length of IM Runners on the Volumetric Efficiency; and finally comes the important conclusions of this study.

International Journal of Bridge Engineering, Vol. 12, No. 1, 2024: pp. 65-92