Full-scale experimental study on post-tensioned prestressed precast frame structures

被引：0

作者：

Guo H. ^{[1
]}

Shi P. ^{[1
]}

Qi H. ^{[2
]}

Wu B. ^{[3
]}

Pan P. ^{[4
]}

Li L. ^{[1
]}

Liu K. ^{[1
]}

Wang D. ^{[2
]}

机构：

[1] China Construction Science & Technology Co., Ltd, Beijing

[2] China State Construction Engineering Co., Ltd., Beijing

[3] School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan

[4] Department of Civil Engineering, Tsinghua University, Beijing

来源：

Jianzhu Jiegou Xuebao/Journal of Building Structures | 2021年 / 42卷 / 07期

基金：

中国国家自然科学基金;

关键词：

Full-scale test; Precast prestressed efficiently fabricated frame; Seismic performance; Shear capacity at beam end; Unbonded prestress;

D O I：

10.14006/j.jzjgxb.2019.0520

中图分类号：

学科分类号：

摘要：

To study the seismic performance of a novel precast prestressed efficiently fabricated frame (PPEFF) system and the progressive collapse resistance of PPEFF system with accidental failure of anchorage of prestressed tendon, full-scale mock-up tests of a two-story three-span concrete frame were conducted. The heights of the first floor and the top floor were 4.2 m and 3.5 m, respectively. The spans of the middle beam and the side beam were 8.5 m and 7.5 m, respectively. The sections and reinforcements were designed for a seismic precautionary intensity of 8 degree (0.3g) according to the GB 50011-2010 'Code for seismic design of buildings'. The horizontal low cyclic load was first applied at the top floor of the frame. The weakened mild steels at the end of the beam and at the bottom of the column yield at a loading drift angle of 0.01 rad. The residual drift angle of the structure reaches 0.005 rad with a drift angle of 0.019 5 rad, which shows good low-damage and self-centering characteristics. The horizontal load reaches its peak value with a drift angle of 0.04 rad, while the prestressed tendon is still in elastic, which shows excellent bearing capacity and energy dissipation ability. The deformation, stiffness degradation, energy dissipation, prestress changing and beam elongation behavior of the frame during the test were observed in detail. The numerical simulation was performed whose results were in good agreement with the experimental results. After the horizontal low cyclic load test, the tendon anchor at one end of the first floor was removed artificially and the vertical action was applied at beam ends to verify the shear capacity at the beam ends after severe earthquake and the effectiveness of local bonding measures in the beam span. The failure modes at the beam end of PPEFF joint under the conditions of effective and failure of prestressed tendons were obtained. It is demonstrated that the PPEFF beam-column joint has good shear resistance and safety redundancy. © 2021, Editorial Office of Journal of Building Structures. All right reserved.

引用

页码：119 / 132

页数：13

共 22 条

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