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Numerical study of a multiple post-tensioned rocking wall-frame system for seismic resilient precast concrete buildings

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Earthquake Engineering and Engineering Vibration 2022年第2期21卷 377-393页

作者： Afshin Naserpour Mojtaba Fathi Department of Civil Engineering Engineering FacultyRazi UniversityKermanshah ***Iran

A multiple rocking wall-frame(MRWF)system,in which the wall panels are directly connected to the adjacent beams and foundation is presented *** the MRWF system,the unbonded post-tensioned(PT)tendons are used to promote the self-centering ability,and O-shaped steel dampers are applied to enhance the energy dissipation capacity and reparability of the ***,analytical equations are proposed to determine the behavior of the O-shaped ***,the MRWF system is numerically evaluated for five different models consisting of rocking walls with varying numbers and arrangements while keeping the total effective width of wall panels *** numerical results show that with an increase in the number of wall panels and a decrease in the wall width,the hysteretic behavior of the MRWF system tends to the ideal flag-shaped pattern,resulting in little damage to the beams,insignificant strain in the wall toe,negligible residual drifts and damage index of less than 0.2 under severe *** contrast,the conventional model demonstrates extensive damage to the structural elements due to undesirable wall-to-frame interaction,which leads to a damage index of 0.78 and residual drifts of 0.42%under seismic loads.

关键词： precast wall-frame system rocking behavior post-tensioning O-shaped steel damper residual drift

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Seismic performance of damaged frame retroﬁtted with self-centering and energy-dissipating rocking wall

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Resilient Cities and Structures 2023年第1期2卷 143-151页

作者： Genqi Xiao Haishen Wang Peng Pan Department of Civil Engineering Tsinghua UniversityBeijing 100084China Key Laboratory of Civil Engineering Safety and Durability of the China Education Ministry Tsinghua UniversityBeijing 100084China

This paper proposes the novel concept of retroﬁtting damaged reinforced concrete frame with self-centering and energy-dissipating rocking *** studies were carried out base on pushover and time-history *** both pushover and time-history analysis,the soft-story mechanism was effectively mitigated through the rocking wall retroﬁt of the damaged *** results demonstrated that the stiffness and bearing capacity of the retroﬁtted system were improved compare to its intact ***,the seismic response of the damaged frame retroﬁtted using rocking wall in combination with post-tension and shear-type damper fell within the relevant design *** analysis of the rocking wall indicated that there is a linear relationship between the wall thickness and the initial stiffness of the retroﬁtted *** addition of post-tension tendon to the rocking wall system enables the wall to self-center and increases lateral stiffness and bearing capacity of the retroﬁtted *** the shear-type damper was installed,the energy dissipation of the system was increased,and the stiffness and bearing capacity of the retroﬁtted system were also *** the time-history analysis,it was found that the thickness of the rocking wall is directly related to the maximum inter-story drift and the distribution patterns of inter-story drift of the *** the post-tension was added to the system,the maximum inter-story drift under rare earthquake excitation improved signiﬁ*** the addition of shear-type dampers,the overall drift magnitude of the retroﬁtted system was fundamentally decreased.

关键词： Rocking wall Damaged frame retroﬁt post-tensioning Shear-type damper

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Structural Safety and Reliability of post-Tensioned Floor-Slabs

Structural Safety and Reliability of Post-Tensioned Floor-Sl...

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国际桥梁2004年大会

作者： Uwe ALBRECHT Gilbert RAYNARD Prof. Dr.-Ing.FH Nordostniedersachsen Buxtehude Germany Principal Read Jones Christoffersen Vancouver B. C. Canada

＜正＞ post-tensioning with unbonded tendons offers great advantages for floor-slabs. Design and construction have to consider that a local damage accounts to the total loss of the tendon. The paper puts emphasis on the combination of prestressed and mild reinforcement and makes suggestions how to improve the reliability, ductility and redundancy of post-tensioncd floor-slabs.

关键词： post-tensioning floor-slabs unbonded tendons structural safety reliability ductilty redundancy design criteria construction

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