Collapse of a high-rise building with pretensioned high-strength concrete piles

At present, the application of high performance concrete in super high-rise building engineering structure is more and more extensive. The mix proportion of high-strength concrete is the basic variable of concrete, and the rebound detection of building structure is carried out. On this basis, the design method of building pressure matching is proposed. Due to the large error of the estimated value of the strength test curve unified by the whole country, in a new project in Xi’an, the rebound method and core drilling method are carried out on several concrete members, and it is concluded that the test results of rebound method and core drilling method with different strength levels are quite different. In view of the difference of test results of mix proportion rebound method of high-strength concrete of super high-rise buildings in Xi’an area, the correction method of rebound difference of different strength levels is put forward.

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Application and analysis of the actual measured results on C80 high-strength concrete in high-rise apartment construction

2011 International Conference on Electric Technology and Civil Engineering (ICETCE) ◽

10.1109/icetce.2011.5774297 ◽

2011 ◽

Author(s):

He Xiping ◽

Yao Shoutao ◽

Ding Kewei ◽

Hu Bangjun ◽

Sheng Ji ◽

...

Keyword(s):

High Strength Concrete ◽

High Strength ◽

Strength Concrete ◽

High Rise

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Seismic behaviour of prestressed high-strength concrete piles under combined axial compression and cyclic horizontal loads

Advances in Structural Engineering ◽

10.1177/1369433218806191 ◽

2018 ◽

Vol 22 (5) ◽

pp. 1089-1105 ◽

Cited By ~ 2

Author(s):

Xizhi Zhang ◽

Sixin Niu ◽

Jia-Bao Yan ◽

Shaohua Zhang

Keyword(s):

Finite Element ◽

Axial Compression ◽

High Strength Concrete ◽

High Strength ◽

Element Model ◽

Test Results ◽

Seismic Behaviour ◽

Strength Concrete ◽

Concrete Piles ◽

Concrete Pile

In order to simulate the seismic behaviour of the prestressed high-strength concrete piles under working state, six full-scale prestressed high-strength concrete piles were tested under combined axial compression and cyclic horizontal loads. Different axial compression levels and prestressing levels of prestressed tendons were studied in this test programme. The failure mode, bending resistance, displacement ductility, stiffness degradation and energy dissipation of the prestressed high-strength concrete piles under different loading scenarios were measured and analysed. Test results indicated that the axial compression ratio and prestressing level of prestressed tendon significantly influenced the seismic performance of prestressed high-strength concrete piles. Theoretical models were developed to predict cracking, yielding and ultimate bending resistances of the prestressed high-strength concrete pile under combined compression and bending. Finite element model was also developed to simulate the ultimate strength behaviour of the prestressed high-strength concrete pile under combined compression and flexural bending. The accuracies of the theoretical and finite element model were checked through validations of their predictions against the reported test results.

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