Design and compilation of specifications for a modular‐prefabricated high‐rise steel frame structure with diagonal braces. Part I: Integral structural design

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Summary The use of modular‐prefabricated steel structures has distinct advantages, such as rapid construction, industrial production, and environmental protection. Although this type of structure has been extensively employed around the world, it is primarily used for low‐rise buildings; its application in high‐rise buildings is limited. This paper proposes a new type of modular‐prefabricated high‐rise steel frame structure with diagonal braces. An elastic–plastic time‐history analysis of a 30‐storey building during rare earthquakes was performed. The base shear, storey drift, stress, damage characteristics, and other performances of the structure were investigated. According to the mechanism analysis, finite element simulation, and model test, the formulas for the elastic and elastic–plastic design of the truss–column connection, column–column flange connection, and diagonal brace–truss connection are proposed in this paper. The control parameters for the structural design are also discussed. This study provides an important reference for the research and design of this type of modular‐prefabricated high‐rise steel structure. The design method has been compiled into a design specification named Technical Specifications for Prefabricated Steel Frame Structure with Diagonal Bracing Joints, which is unique for this type of structure.

Section: Design and Test Of Column–column Flange Connectionmentioning

confidence: 99%

Section: Design and Experiments Of Truss–column Connectionmentioning

confidence: 99%

Section: Total Base Reactionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design and specification compilation of a modular‐prefabricated high‐rise steel frame structure with diagonal braces part II: Elastic–plastic time‐history analysis and joint design

Liu

Zhang

et al. 2017

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“…In the field of seismic engineering, the pushover method, which represents a relatively simple tool for evaluating the seismic capacity of a structure in comparison with the computationally complicated elasto‐plastic dynamic time‐history analysis method, has been widely adopted . Currently, conventional pushover analysis is based on an invariant horizontal lateral loading pattern, such as an inverted triangular distribution or a uniform distribution.…”

Section: Introductionmentioning

confidence: 99%

Combination model for conventional pushover analysis considering higher mode vibration effects

Guan

Liu

et al. 2019

Summary This paper aims to propose a combination model for conventional pushover analysis with invariant lateral load patterns to consider the effects of higher mode vibrations on the seismic responses of high‐rise buildings. Rectangular concrete‐filled steel tubular (RCFT) structures having two types of deformation, namely, shear type RCFT frame structures and shear‐flexural type RCFT frame‐shear wall structures, are selected and investigated. Finite element models are created using Perform‐3D. Both pushover analysis with three conventional lateral loading patterns, namely, uniformly distributed loading, first‐mode vibration loading, and concentrated loading at the vertex, and time‐history analysis with 15–21 earthquake records chosen for each RCFT structure are performed. Regression analysis is used to fit the interstory drift ratios obtained by the pushover analysis with those from the time‐history analysis. Further, the relations between the partial regression coefficients and the structural fundamental periods under certain lateral loading patterns are analyzed. On this basis, using these conventional lateral loading patterns, combination models for high‐rise buildings with two types of deformation are proposed and verified. The results demonstrate that the proposed method can estimate the seismic responses of high‐rise buildings with a high accuracy and has the advantages of ease of implementation and operation.

Seismic performance of steel braced frames with self‐centering buckling‐restrained brace utilizing superelastic shape memory alloys

Nazarimofrad

Shokrgozar

2019

Buckling-restrained braced frame (BRB) is one of the newest seismic force-resisting systems used in buildings. However, one of the requirements for designing a structure is to provide a ductility behavior of structures to dissipate earthquake energy and to avoid residual drifts. These days, self-centering seismic lateral force-resisting systems have drawn attention due to their potentials to solve the above mentioned issues. On the other hand, shape memory alloys (SMAs) are characterized by unique superelastic behavior, which enables the material to recover its original shape after experiencing large deformations. The goal of this study is to assess BRBs whose ductility are improved by utilizing SMA. Nonlinear time history and incremental dynamic analysis techniques are applied to investigate the behavior of the two frames with different stories (four and eight stories) under different ground motion records. The results showed that utilizing BRB made of hybrid steel and SMA resulted in increasing ductility of the structure and decreasing residual displacements of the structures. KEYWORDS brace, ductility, dynamic pushover, nonlinear time history, self-centering, SMA | INTRODUCTIONThere are a plenty of seismic resistant members that have been developed to reduce the likelihood of collapse of structures subjected to earthquake such as braces, [1][2][3][4][5] shear wall, [6,7] confined reinforced concrete structures, [8] filled with high-performance concrete, [9] concrete-filled-steel tube structures, [10] and so on. These days, buckling-restrained braced frames (BRBs) have increasingly been employed as seismic load-resisting systems in the area with high seismic hazard due to the fact that their performance is much better than that of conventional braced frames.Despite the fact that the global geometric configuration of a BRB is very similar to a conventional braced frame, however, the members and behavior of BRB is clearly different from those of conventional braced frames. The key difference is that BRB systems do not buckle. [5,[11][12][13] Conventional braced frames have shown a poor performance in several recent ground motions because of limited ductility, insufficient energy dissipation capacity, and large residual deformations. [14] It is affirmed that BRBs made of steel efficiently resulted in providing structures with significant ductility, stable hysteretic behavior, and large energy dissipation capacity. [15] However, past studies have shown that steel BRBs commonly are brittle and undergo a large residual deformation after earthquakes. [16] The appearance of large residual deformations caused by strong earthquakes makes the residents of building insecure and may even demolish the building. On the other hand, repairing the residual deformations can be expensive and even impossible. [17] In recent years, researchers have attempted to utilize self-centering BRB systems containing SMA material to improve its ductility characteristics and decreasing residual deformations in structures. [18][19][20][21][22][2...