scholarly journals Cyclic behavior of braced concrete frames: Experimental investigation and numerical simulation

HBRC Journal ◽  
2017 ◽  
Vol 13 (3) ◽  
pp. 262-270 ◽  
Author(s):  
Hadad S. Hadad ◽  
Ibrahim M. Metwally ◽  
Sameh El-Betar
Keyword(s):  
Numerical Simulation ◽  
Experimental Investigation ◽  
Cyclic Behavior ◽  
Concrete Frames

scholarly journals Cyclic Behavior of Braced Concrete Frames: Experimental Investigation and Numerical Simulation

2015 ◽  
Vol 61 (2) ◽  
pp. 101-114
Author(s):  
Hadad S. Hadad ◽  
Ibrahim M. Metwally ◽  
Sameh El-Betar
Keyword(s):  
Numerical Simulation ◽  
Load Capacity ◽  
Shear Walls ◽  
Load Resistance ◽  
Lateral Load ◽  
Cyclic Behavior ◽  
Concrete Frames ◽  
Initial Stiffness ◽  
Infilled Frames ◽  
Different Types

Abstract RC shear walls have been widely used as the main lateral-load resisting system in medium and high-rise buildings because of their inherent large lateral stiffness and load resistance. But, in general, the energy dissipating capacity of RC shear walls is not very good and it has been found that using the bracing system gives good results. The main purpose of this paper is to study the effect of different types of bracing on the lateral load capacity of the frame. Also, the research contains a comparison between the braced and infilled frames to decide on the best system. The research scheme consists of four frames; the bare frame, two frames the first of which was braced with concrete, the second was braced with steel bracing and the fourth frame was infilled with solid cement bricks. All the specimens were tested under cyclic loading. The results gave some important conclusions; braced and infilled bare frames increased the lateral strength of the bare frame depending on the type of bracing and infill. Also, the different types of bracing and the infill increased the initial stiffness of the bare frame by a reasonable value. The energy dissipation for the braced and infilled frames is always higher than that for the bare frame up to failure. Also, numerical modeling was carried out with the nonlinear software platform (IDARC). The numerical results obtained with the calibrated nonlinear model are presented and compared with the experimental results. Good agreement was achieved between the numerical simulation and the test results.

Numerical Simulation & Experimental Investigation of SMT Laser Microsoldering Thermal Process

1991 ◽  
Vol 226 ◽  
Author(s):  
Wang Chunqing ◽  
Qian Yiyu ◽  
Jiang Yihong
Keyword(s):  
Thermal Conductivity ◽  
Numerical Simulation ◽  
Experimental Investigation ◽  
Thermal Process ◽  
Light Wave ◽  
Light Reflection ◽  
Lead Wire ◽  
Wire Surface ◽  
Conductivity Variation ◽  
Thermal Conductivity Variation

AbstractIn this paper,a numerical simulation of thermal process in the SMT laser microsoldering joint has been developed, in which, the influence on thermal process of the factors such as the thermal conductivity variation of solder with temperature, light reflection coefficient of the lead wire surface, and heat exchange on the surface of SMT materials all have been considered. In order to carry this numerical calculation practice and prove it's results,the reflexive characteristic of light wave to the SMT materials has been gauged,and the dynamic temperature process of laser microjoint has been measured by a new experimental method which was invented by the authors.The results of numerical simulation have been borne out by the tests, and the influences of heating parameters on thermal process has been analysed in this paper.The conclusions will be advantageous to the further study of the microjoint quality control in the SMT laser microsoldering.

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