|Table of Contents|

Differential Deformation Analysis of Vertical Member Based on B3 Model(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2010年01期
Page:
108-116
Research Field:
Publishing date:
2010-03-20

Info

Title:
Differential Deformation Analysis of Vertical Member Based on B3 Model
Author(s):
ZHAO Xin1;  ZHANG Pan-pan2;  ZHENG Yi-min1;  YAN Xing-xiang2
1. Architectural Design & Research Institute of Tongji University(Group)Co., Ltd., Shanghai 200092, China; 2. Department of Building Engineering, Tongji University, Shanghai 200092, China
Keywords:
B3 model;  shrinkage;  creep;  outrigger braced mega frame core-wall structure;  differential deformation;  deformation compensation
PACS:
TU375.4
DOI:
-
Abstract:
In order to study the vertical differential deformation between super columns and core-walls due to shrinkage and creep in outrigger braced mega frame core-wall structure, B3 model was applied to revealing the shrinkage and creep behavior of a tall outrigger braced mega frame core-wall structure. Through building a MATLAB program, strain incremental method was used to simulate the virtual construction process of the building by applying load sequentially story by story. The vertical deformation under gravity load was studied by taking into account the construction process, shrinkage and creep of concrete. Based on the proposed method, the compensation, the vertical deformation and the differential deformation before and subsequent to casting of floor were estimated. Differential deformation compensation was analyzed and elevation compensation for each floor was also calculated. Results show that the inelastic deformation dueto shrinkage and creep of core-walls and super-columns take up 50 percentof the total deformation. There is a tendency to increase with the developmentof shrinkage and creep. The shrinkage deformations of super-columns and core-walls are much smaller than the creep deformation, and the ultimate shrinkage and creep deformation tend to constant. The vertical deformations of members are approximately equal to the casting of floor while they are greatly different subsequent to the casting of floor. The maximum deformation subsequent to the casting of floor occurs some middle floor assuming that all loads have been applied after the top floor is casted. Compensation for each floor can significantly minimize the additional force of the outriggers caused by differential shortening for some special structures.

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Last Update: 2010-03-20