Error Estimation In Analyzing High-rise Steel Structures Ignoring The Resistance Of The Vertical Bracing System To Vertical Loads

There are always two or more types of loads exposed to high-rise steel structures, such as vertical loads and horizontal loads, and the vertical bracings as the main resistance components to lateral force, are mainly responsible for the shear force produced by the horizontal loads. In the actual analysis of support forces always mainly considers the role of horizontal loads while neglecting the role of the vertical bracing system resisting to vertical loads. With the development of high-rise steel structures, buildings become higher and more complex, so in some mechanical analysis of support system, whether or not considering the role of vertical bracing to bear vertical load tends to produce much more deviations.This paper uses ANSYS with its great advantages in parametric design and data post-processing to do modular modeling design. For the six different high-rise steel structures of the framework-support system, framework-tube system, tube in tube system, frame-tube bundle system, giant outer-support system and mega-frame system, this article analyzes the deviation range of the force in vertical bracing systems with or without considering the vertical support to bear vertical load, and does the research on the rationality in structural design ignoring the braces to withstand the vertical loads. Through the superposition of internal forces produced by framework-support structures exposed to horizontal loads and net framework structures exposed to vertical loads, this paper further discusses the situation of other components in the structures with or without considering the bracing system to bear vertical loads.For the framework-support system and framework-tube system, the deviation range of forces in braces is from 1% to 10% with or without considering the bracing system to bear vertical system Forces, and the influence of the vertical loads applied to herringbone braces is significantly less than the one applied to diagonal braces. Because of the great lateral stiffness in outer tube, horizontal loads and vertical loads play equally role in terms of forces in the braces for the tube in tube system. For the frame-tube bundle system, because each frame-tube structure has a commitment to vertical loads solely, the deviation range of forces in braces is almost under 7% with or without considering the bracing system to bear vertical system. Finally, through the comparison analysis of forces in braces for giant outer-support system and mega-frame system, the former giant braces play a major role in resisting the horizontal loads while resisting most vertical loads at the same time, and the latter deviation range of forces in braces is between 20%-30% whether or not considering the effects of vertical bracing system resisting vertical loads.