Drift design model for high‐rise buildings based on resizing algorithm with a weight control factor

Abstract

It is well known that the weight of the structural system for a high-rise building to resist lateral loads increases in nonlinear fashion with increase in building height and slenderness ratio. For a given building height or slenderness ratio, the weight of the structural system for a high-rise building subjected to lateral loads depends on the degree of stiffness of the building structure. Therefore, at the final stage of the structural design process, it has been a challenge to structural engineers to improve the efficiency of a structural system by either minimizing the weight of a structure for a given limit on lateral displacement or maximizing the degree of stiffness for a given weight of a structure. In this paper, a resizing design method that can minimize the magnitudes of lateral displacement and inter-story drift of a high-rise building with respect to structural weights is presented. Based on the proposed design method, the relation between the structural weight and the magnitude of lateral displacement is investigated using two examples, including a 60-story high-rise building.1 1According to Equations (4) and (5), the sectional properties of members in the groups are modified and the displacement to be designed is minimized. APPLICATION TO DRIFT DESIGN OF HIGH-RISE BUILDINGSBy combining the strength design module and the drift design method using resizing algorithms with the structural weight control factors, the drift design model of high-rise buildings proposed in this paper is shown in Figure 1. Using the model, a high-rise building can be designed in three steps. In the first step, the group displacement participation factors in Equation (1) are calculated using a preliminary design satisfying the strength requirements based on design specifications. If the calculated 566 J. H. SEO ET AL.

Wind-Induced Response Control Model for High-Rise Buildings Based on Resizing Method

“…The resizing algorithm is used to increase the natural frequency of a high-rise building by improving the stiffness of the building (Park, H. S., Park, C. L. 1997;Park et al 2008;Seo et al 2008). In the resizing algorithm, to increase the natural frequency of a high-rise building, the stiffness of the building structure is improved by reducing the lateral displacement at the top of the building without increasing the weight of the structure.…”

Resizing Technique-Based Hybrid Genetic Algorithm for Optimal Drift Design of Multistory Steel Frame Buildings

“…Then, the weight modification factor of each member, , can be obtained as follows: The weight modification factor obtained from (12) is multiplied with the cross-sectional area of the th member to resize the weight of the th member to minimize the lateral displacement. As a result, each member now has an adjusted cross-sectional area according to the displacement participation factor; thus, they can effectively determine how to control the target lateral displacement of a building [23]. In this manner, the lateral displacement of a building (i.e., the stiffness) is effectively controlled by the resizing technique without repetition of structural analysis.…”

“…Additional calculations required for displacement participation factors are stress resultants for a unit load. Thus, the resizing technique is an optimal drift design technique that requires neither sensitivity analysis nor repeated structural analysis [22,23]. However, because the effect of resizing technique heavily depends on the assumed initial design, the resizing technique for the optimal drift design is not useful in the global exploration but is efficient as the local search operator.…”

A Deformed Shape Monitoring Model for Building Structures Based on a 2D Laser Scanner

“…In general, as one of the representative indices of serviceability design, the maximum lateral displacement at the top of a high-rise building is checked not to exceed a specified limit, which is in the range of 1/400–1/600 of the building height [18,19]. In the case of a high-rise building with the height of 200 m, the limit for the maximum lateral displacement is given in the range of 333.33 mm to 500 mm.…”