Shaking table test and time-history analysis of high-rise diagrid tube structure

Abstract

IntroductionWest tower in Guangzhou Zhujiang new city is a new type of tube structure system as shown in Fig. 1 and Fig. 2, which has total floor area of 247000 square meters. Outer tube of this structure consists of diagonal members which are concretefilled steel tube columns, while inner tube consists of shear walls and steel frames. Shear walls of inner tube are cancelled above 67th floor and replaced by steel frames. Elevation for the underground fourth floors is -18.7meters, and elevation for the top of structure is 432 meters. Because the height of West tower is higher than code limit value and shear walls of inner tube change into oblique steel frame at 67th floor, which leads to vertical irregular arrangement of the structure. Thus, West tower belongs to a complex super high-rise structure [1] .At present, researches on high-rise diagrid structures are still not very mature. Moon [2] proposed preliminary design method for diagonal members. Han [3] researched deflection, stress and failure mode of diagonal nodes by conducting model test of concrete filled steel tubular joint. Tian [4] conducted a shaking table test on West tower by using micro-concrete and brass tube, and destructed form of West tower was obtained. Kim [5] obtained hysteresis curve of steel diagonal nodes by experiment. Kim [6] evaluated the seismic performance of diagrid structure by finite element method.Structural type of diagrid structure makes the force-mechanism become complicated, and it also makes mechanical property calculation of diagrid structure difficult. Therefore, it is necessary to carry out further experimental study on seismic performance of whole structure. For this reason, a shaking table test of a plexiglas model in scale 1:80 was carried out to study the seismic performance of the structure. In further, an elastic time-history analysis by finite element software was carried out on the structure, the mechanical characteristics and weak parts of the diagrid tube structure were obtained by comparing the results of analysis and shaking table test. In this paper, the research also expects to provide the basis for the reasonable design of diagrid tube structure.

Seismic response of a light steel structure integrated building with steel mortise–tenon connections

“…The test model was a single room of the entire building on a full scale, that is, it can be used as a real house for living. Because of the use of the full-scale housing model, according to similarity ratio theory (Liu et al, 2017; Zhou and Lv, 2012), the similarity ratio of the shaking table test is 1.…”

Robustness analysis of vertical resistance to progressive collapse of diagrid structures in tall buildings

“…As a new type of high‐rise building structure, diagrid tube structure subjects to complex loading. [ 27,28 ] Under normal operational condition, inclined column component section not only bears internal force mainly based on axial force, but also bends moment and shear force, and so forth, which makes the stress of structure component section become complicated, and many uncertain factors of component failure appear. [ 29 ] Therefore, it is necessary to study the damage sequence of components, the vulnerability extent of components, and the robustness of structures under vertical loads.…”

Effects of Out-of-plane Brace-to-chord Angle on Multiplane CHS X-joints Behavior Under Brace Compression

“…Chen et al [14] performed experimental and FE studied on the static behavior of double-skin CHS X-joints under axial compression, and proposed the corresponding design equations for the double-skin X-joints. Nassiraei et al [15] performed FE analyzed to study the effects of doubler plate size and connections geometry on the ultimate strength, initial stiffness, and failure modes in CHS T-and Y-joints reinforced with doubler plate subjected axially tensile load [16]; and the results indicated that the doubler plate can significantly increase the initial stiffness, ultimate capacity, and considerably improve failure modes. Lan et al [17] carried out numerical and theoretical studies on static strength of internally ring-stiffened CHS DT-joints subjected to brace axial compression or tension, and proposed equations for predicting the capacity of the DT-joints.…”