International Research Journal of Engineering and Technology (IRJET) Volume: 04 Issue: 03 | Mar -2017
e-ISSN: 2395 -0056
www.irjet.net
p-ISSN: 2395-0072
STEEL FRAMES WITH KNEE BRACES BASED ON PUSHOVER ANALYSIS NITHIN JOSEPH1, JEBIN JAMES2
2Head
1Faculty
,United Cadd Solutions, Ernakulam, Kerala of Department ,United Cadd Solutions, Ernakulam, Kerala
---------------------------------------------------------------------***--------------------------------------------------------------------ABSTRACT The great strength, uniformity, light weight and many other desirable properties makes steel the material of choice for numerous structures such as steel bridges, high rise buildings, towers and other structures. Steel bracing provides an effective solution for resisting lateral forces in a framed structure. Knee braced steel frame has got excellent ductility and lateral stiffness. Since the knee element is properly fused, yielding occurs only to the knee element and no damage to major elements. In this study, steel frames with knee braces had been modeled using ETABS software. And after that, performance of both the frames had been studied using nonlinear push over analysis and nonlinear time history analysis. Various parameters such as displacement and stiffness were studied. Keywords - Displacement, Nonlinear static analysis, Nonlinear time history analysis, Steel bracing, Stiffness. INTRODUCTION A reinforced concrete building should be designed to have a capacity to carry combined loads (dead, live and seismic loads) at certain safety level and at certain degree of reliability. Proper account of loads, material properties, structural system, and method of analysis are fundamental factors in the design of structure. When this design is finally executed in the construction process, the expected performance of the structural building should come into satisfaction. However, this ideal condition is not always realized. Performance of structural building could be below the expected criteria in term of safety level and service life due to a variety of causes. In addition to faulty design and improper construction, there are other situations that could impair the future performance of structural building such as alteration of building functions, changes of seismic load characteristics in the area, ingress of aggressive agents from the environment, etc
In term of seismic load characteristics, it is common to come across buildings which used to be meeting the seismic requirements and now their seismic performance are in question due to increase in the current seismic demand. It is also common to discover buildings with degrading performance after damaged by earthquake and therefore, their seismic performance also do
Š 2017, IRJET
|
Impact Factor value: 5.181
|
ISO 9001:2008 Certified Journal
|
Page 1407