Time filter

Source Type

Wang D.,East China Architectural Design and Research Institute Co. | Fang W.,East China Architectural Design and Research Institute Co. | Zhang W.,East China Architectural Design and Research Institute Co. | Ding S.,East China Architectural Design and Research Institute Co. | And 3 more authors.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2010

The Expo Axis project and its underground multi system is the landmark building of the World Expo Shanghai 2010. Its roofing system is composed of cable-membrane structure and Sun Valley steel structures. Sun Valley is a steel single-layer latticed shell consisting of triangular grid. As to its characteristics with complicated curved surface, huge size and large cantilever span, single layer system etc. The structural design was applied with approaches like elastic analysis under frequently-occurred earthquake, response spectra method under rarely-occurred strong earthquake, and structural elasto-plastic time-history analysis under rarely-occurred strong earthquake as well. Results from all analyses show that structural system of the Sun Valley structure not only works within elastic range under all load combinations but also has good earthquake-resistant performance and all members work elastically under strong earthquake motion. Wind load is the primary design concern among all the loads. The structure presents a good bearing behavior due to all types of loads. Source

Chen M.,Zhejiang University | Xing D.,Zhejiang University | Zhao Y.,Zhejiang University | Su L.,Zhejiang University | And 4 more authors.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2010

A new type of joint was adopted in the single-layer lattice structure of the Sun Valleys for Expo Axis project. The design idea of the new joints was that only upper and lower flanges of rectangular steel tube members and webs of two main members with maximum internal forces were welded to the core zone of the joint. According to processing technology, the core zone has two types of configuration: two end plates connected with stiffener and solid cylinder. Ten typical full-scale joints selected from three Sun Valleys were tested, in order to investigate the structural behavior, failure mechanism and load bearing capacity of the joints so that the safety and reliability of joints could be assured, and to verify the joints fabricated with different processing technologies could meet the design requirement. Test results indicate that the joints adopted in the project have sufficient safety reserves and can meet the requirement of 'strong-joints/weak-member' concept. For joints with a solid cylinder as the core zone, the stress level is lower and stress concentration is relatively mild. Results from finite element modeling of the test joints indicate that, the elasto-plastic nonlinear analysis considering large deformations can simulate the bearing behavior of the joint satisfactorily. Source

Tian W.,Zhejiang University | Zhao Y.,Zhejiang University | Xiang X.-A.,Zhejiang University | Dong S.-L.,Zhejiang University | And 3 more authors.
Tumu Jianzhu yu Huanjing Gongcheng/Journal of Civil, Architectural and Environmental Engineering | Year: 2010

The stability behavior of shuttle-shaped steel lattice columns subject to combined axial force and bending moment was examined through elastic buckling analysis and geometrically and materially nonlinear analysis. Firstly, the concept of section stiffness variation ratio is proposed for shuttle-shaped lattice columns and the elastic buckling behavior is discussed. Then, the effect of bending moment on the stability behavior of lattice columns is investigated, with the emphasis on the development of axial stress, bending stress and shear stress. The influence of column component spacing and diaphragm thickness on the stability bearing capacity is also analyzed. It is shown that the elastic buckling mode of the lattice column is dependent on its section stiffness variation ratio; for lattice columns with C-shaped buckling mode, the reduction in stability bearing capacity caused by bending moment is smaller than that of columns with S-shaped buckling mode; the maximum stability bearing capacity of the lattice column can be achieved by adjusting the column component spacing, and the spacing corresponding to the maximum capacity is basically consistent with the critical spacing for transformation of C-shaped buckling mode and S-shaped mode; and it is more effective to increase the thickness of columns with S-shaped buckling mode to get larger bearing capacity. Source

Tian W.,Zhejiang University | Xiang X.,Zhejiang University | Zhao Y.,Zhejiang University | Dong S.,Zhejiang University | And 3 more authors.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2010

Shuttle-shaped steel lattice columns were adopted in the Expo Axis project for 2010 Shanghai Expo. This paper investigated the stability load-carrying capacity of shuttle-shaped lattice columns considering the action of bending moment through geometrically and materially nonlinear FE method. The emphasis was on the effects of orientation and distribution pattern of initial geometric imperfections on the stability bearing capacity of shuttle-shaped columns. Comparison was made between numerical results and experimental results. It is shown that, the first elastic buckling mode of shuttle-shaped lattice columns subject to combined axial force and bending moment involves S-shaped mode and C-shaped mode. The imperfection orientation has obvious influence on stability bearing capacity for columns with bending moment. For columns with S-shaped buckling mode, only S-shaped imperfection should be considered in the calculation of stability capacity, while for columns with C-shaped buckling mode, and both C-shaped imperfection and S-shaped imperfection should be considered. Results from the comparison with experiments indicate that the method presented in this paper for the determination of stability bearing capacity of shuttle-shaped lattice column is safe and rational. Source

Han Z.-H.,Tongji University | Zhou X.-Y.,Tongji University | Gu M.,Tongji University | Zhang A.-A.,Shanghai World Expo Land Holding Co. | And 2 more authors.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2011

Based on wind pressure data from wind tunnel tests, the wind-induced responses of sun-valley structure of Expo Axis were calculated both in frequency domain and time one. Then, the characteristics of the wind-induced responses were analyzed. The RSM values, the peak values and the power spectral density of some typical displacements and element axial forces obtained with two different methods mentioned above were compared. The results indicated that the RSM values computed in frequency domain are smaller than those in time domain; the comparison of power spectral density curves shows similar energy distributions; the most unfavorable condition is 225° wind direction. Source

Discover hidden collaborations