Yang X.-L.,Zhejiang Province Institute Architectural Design and Research |
Zhou P.-H.,Zhejiang Province Institute Architectural Design and Research
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2010
The top-down construction method brings some new technical problems in the design of basements because of its construction process different from that of the normal down-top construction method, for instance, different distributions of the lateral pressure form the down-top construction method, and the significant effect on the stress and displacement of the basements and retaining structures by different construction processes. On the basis of the principal technology and construction process of this new method with the background of practical project examples, some key problems are analyzed and introduced, including the design of vertical and horizontal support systems, the lateral deformation control, the vertical bearing capacity and the differential settlement control of enclosure walls, the verticality control of soldier columns, measures against the sudden welling of foundation pits under the deep confined water as well as the numerical analysis of basements using the top-down method and the staged construction simulation.
Yang X.,Zhejiang Province Institute Architectural Design and Research |
Li X.,Zhejiang Province Institute Architectural Design and Research |
Mao C.,Zhejiang Province Institute Architectural Design and Research |
Feng Y.,Zhejiang Province Institute Architectural Design and Research |
Zhou P.,Zhejiang Province Institute Architectural Design and Research
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2010
There are many indexes to describe the whole performance of tall buildings in 'Code for seismic design of buildings' and 'Technical specification for concrete structures of tall building', for example, stiffness-weight ratio, torsional displacement ratio and period ratio, story stiffness ratio and ratio of shearing resistance capacity and so on. The applicability and limitation of these indexes are analyzed, especially to irregular tall buildings beyond the code-specification. It's hard to calculating them correctly and the calculation results cannot guarantee the safety of high rise buildings even if they meet the demands of the code. The performance-based seismic design (PBSD) method is proposed in USA in 90's, 20th century, and it has been gradually applied in structural design of tall buildings beyond the code-specification in our country. This paper presents that how to select the performance objectives and how to carry out the performance-based seismic design according to the Code-exceeding types and degrees of high rise buildings. Applications of the PBSD method on some engineering projects, such as Changzhou Kaina Plaza, Zhejiang New World Wealth Center, Ningbo Global Shipping Plaza , and Wenzhou Lucheng Plaza, are also introduced.