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Primary Study on Pancake Collapse of Concrete Slab-column Structure

Author: WangMingJun
Tutor: WuBo
School: South China University of Technology
Course: Structural Engineering
Keywords: Concrete structures Weak layer Drop- layer collapsed Shaking table test Collision side vibration effect
CLC: TU375
Type: Master's thesis
Year: 2011
Downloads: 64
Quote: 2
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Abstract


Structural strong earthquake off the layer collapsed (ie a floor collapsed suddenly collapsed and sitting under the superstructure overall form) is a common failure mode off the layer of the concrete structure collapsed exploratory study , the main work : ( 1) off the layer collapse tests carried out two weak layer three concrete space slab-column structure model shaking table . Investigated before it collapsed , after the model layers horizontal acceleration and displacement response , as well as the collapse of impact-induced weak layer and its lower floor vertical acceleration response . The test results show that : ( 1 ) the collapse of former model M-1 and M-2 , the fundamental frequency than the initial value only decreased by 8.9% and 4.7% , the rate of frequency change for structure collapsed early warning may be unrealistic ; ② collapse crash led model layers of horizontal acceleration appears to short - term fluctuations , fluctuations during model M - 1 and M-2 of the maximum value of the absolute acceleration between 5g ~ 10g before the collapse of the layers maximum value of the absolute acceleration of 5 to 20 times , respectively , and 10 to 50 times ; ③ collapsing impact caused slab vertical accelerations up of 30 g to 40 g . (2 ) the typical operating conditions of the test model finite element simulation , the initial defect of the pillars of the weak layer ( Layer 2 ) , take a cross-section of local reduction simplified treatment strategies . Comparison of calculation results with experimental results showed that it was feasible to take the strategy to simplify the processing of the initial imperfections of the column end . ( 3) to investigate the collapse during the impact of the test model layers between layers of horizontal force , as well as the collision impulse between the floor and the lower floor of the weak layer , and compared with the corresponding collision simplify still collapse model impulse . The study found that , due to the collision side vibration effect \side of a test of the ability . Finally , through the introduction of three state model collapsed collision process is divided into four stages , simplified analysis method based on a concrete structure off the layer collapse .

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CLC: > Industrial Technology > Building Science > Building structure > Concrete structure,reinforced concrete structure > Reinforced concrete structures
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