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Study on the Back-Analysis of the Frame Structure on Soft Subsoils with Differential Settlements

Author: HuangLiMing
Tutor: JiangXinLiang
School: Tianjin University
Course: Structural Engineering
Keywords: Uneven settlement Joint action Surface equation fitting Back analysis
CLC: TU323.5
Type: Master's thesis
Year: 2010
Downloads: 68
Quote: 0
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Abstract


Built in high-rise buildings on soft ground , buildings tend to have a greater differential settlement under vertical loads . Uneven settlement of the foundation in the upper structure of the additional internal forces and additional deformation , thus affecting the normal use of the upper part of the structure function and ultimate bearing capacity . In this paper, the actual settlement of the existing buildings to the back analysis , a systematic analysis of foundation uneven settlement of the superstructure . In the general case , the actual engineering of the measured points less and mostly distributed around the building , unable to meet the requirements of the counter- analysis of the effects of the upper structure due to uneven ground settlement , first being analyzed to determine foundation differential settlement law . The main contents are as follows : (1) positive analysis of the finite element model of the upper part of the structure , the basis and foundation together , vertical loads , analysis of ground unequal settlement law , draw parabolic surface equation of the buildings and the surrounding foundation uneven settlement law fitting accuracy . ( 2 ) analysis of sedimentation parabolic surface equation coefficients with the building aspect ratio , pile length and the variation of the thickness of the raft , come to reflect subsidence trend equation quadratic coefficient of the building aspect ratio , pile length and thickness of the raft relationship . (3) the building aspect ratio reflect subsidence trend determined by the length of the pile and raft thickness quadratic coefficient based on the building settlement data corrected for the boundary conditions , fitting the actual settlement of the building surface equation . Considering the adjacent building , a building by the area of ??influence of the actual settlement buildings separate settlement with the adjacent buildings around the foundation settlement of superposition . ( 4 ) counter- analysis of the upper structure and basic research , comparative analysis of different settlement , under the conditions of different thickness of the raft and the adjacent buildings impact the actual foundation uneven settlement additional internal forces generated variation of the upper structure .

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CLC: > Industrial Technology > Building Science > Building structure > The system structure of the rod > Rod structure > Frame
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