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Seismic tests of post-tensioned self-centering building frames with column and slab restraints

Chung-Che CHOU, Jun-Hen CHEN

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 3,   Pages 323-334 doi: 10.1007/s11709-011-0119-5

Abstract: However, the gaps are constrained by the columns and the slab in a real PT self-centering building frameMoreover, a sliding slab is proposed to minimize restraints on the expansion of the PT frame.

Keywords： post-tensioned frame     frame expansion     column restraint     sliding slab     frame test     shake table test    

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Punching of reinforced concrete slab without shear reinforcement: Standard models and new proposal

Luisa PANI, Flavio STOCHINO

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 5,   Pages 1196-1214 doi: 10.1007/s11709-020-0662-z

Abstract: Reinforced concrete (RC) slabs are characterized by reduced construction time, versatility, and easier space partitioning. Their structural behavior is not straightforward and, specifically, punching shear strength is a current research topic. In this study an experimental database of 113 RC slabs without shear reinforcement under punching loads was compiled using data available in the literature. A sensitivity analysis of the parameters involved in the punching shear strength assessment was conducted, which highlighted the importance of the flexural reinforcement that are not typically considered for punching shear strength. After a discussion of the current international standards, a new proposed model for punching shear strength and rotation of RC slabs without shear reinforcement was discussed. It was based on a simplified load-rotation curve and new failure criteria that takes into account the flexural reinforcement effects. This experimental database was used to validate the approaches of the current international standards as well as the new proposed model. The latter proved to be a potentially useful design tool.

Keywords： punching shear strength     reinforced concrete     slabs     reinforcement ratio    

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Key Technical Issues Related to Super-high Concrete Slab Dam

Ma Hongqi,Cao Keming

Strategic Study of CAE 2007, Volume 9, Issue 11,   Pages 4-10

Abstract: text-align: justify;">This essay summarizes the main technical points related to 100-meter-high concrete slabdam and analyzes the main problems and their causes of 200-meter-high concrete slab dam during construction Based on the main experiences of the super-high concrete slab dam built after the year of 2000, key technical issues related to 300-meter-high concrete slab dam that need research have been

Keywords： concrete slab dam     super-high dam     technology    

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Effect of eccentricity in reinforced concrete beam-column-slab connection under cyclic loading

Rooh ULLAH, Amjad NASEER, Muhammad FAHIM, Mohammad ASHRAF, Eid BADSHAH

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 2,   Pages 390-398 doi: 10.1007/s11709-021-0690-3

Abstract: This study presents the experimental results of two half-scale eccentric beam-column-slab connections

Keywords： corner connection     eccentricity     strength degradation     stiffness degradation     energy dissipation     performance levels    

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Study on anti crack design method for laminating crack at bottom slab in closure segment

Lin Haifeng,Zhang Dongdong and Zhao Qilin

Strategic Study of CAE 2012, Volume 14, Issue 5,   Pages 106-112

Abstract: >According to the phenomenon of laminating crack while tensioning the pre-stressed cables at bottom slabmodels are established and the transverse and vertical stress between pre-stressed tendons at bottom slabin closure segment are obtained; the stress state and security of bottom slab under different failure

Keywords： bridge engineering     bottom slab     finite element method     failure criterion     biaxial stress    

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Influence of loading ratio on flat slab connections at elevated temperature: A numerical study

Rwayda Kh. S. AL-HAMD, Martin GILLIE, Safaa Adnan MOHAMAD, Lee S. CUNNINGHAM

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 3,   Pages 664-674 doi: 10.1007/s11709-020-0620-9

Abstract: For reinforced concrete members subjected to high temperature, the degree of in-service loading, commonly expressed as the loading ratio, can be highly influential on the structural behavior. In particular, the loading ratio may be pivotal in relation to the phenomenon of load-induced thermal strain. Despite its potentially pivotal role, to date, the influence of the loading ratio on both material and structural behavior has not been explored in detail. In practice, real structures experience variation in imposed loading during their service life and it is important to understand the likely response at elevated temperatures across the loading envelope. In this paper, the effect of the loading ratio is numerically investigated at both material and structural level using a validated finite element model. The model incorporates a proposed constitutive model accounting for load-induced thermal strain and this is shown to outperform the existing Eurocode 2 model in terms of accuracy. Using the validated model, the specific case of flats slabs and the associated connections to supporting columns at various loading ratios are explored. For the cases examined, a marked difference in the structural behavior including displacement direction was captured from low to high loading ratios consistent with experimental observations.

Keywords： concrete     finite elements     fire     load-induced thermal strain     punching shear    

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Applying the spectral stochastic finite element method in multiple-random field RC structures

Abbas YAZDANI

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 4,   Pages 434-447 doi: 10.1007/s11709-022-0820-6

Abstract: uses the spectral stochastic finite element method (SSFEM) for analyzing reinforced concrete (RC) beam/slab

Keywords： stochastic finite element method     correlation length     reliability assessment     reinforced concrete beam/slab    

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Strengthening and Softening of Ferrite+Pearlite Steels Produced by Thin Slab Casting and Rolling

Fu Jie,Wu Huajie,Liu Yangchun

Strategic Study of CAE 2008, Volume 10, Issue 4,   Pages 65-72

Abstract:

Based on the principle of the integrated strengthening of steel, the strengthening and the softening of HSLC steel have been studied by controlling the precipitation of carbon in steel around A1 temperature. The results show that strength of HSLC steel produced by TSCR can be further increased. By using temper-slow cooling, σs of HSLC steel(ZJ330) produced by TSCR can be decreased from 344 MPa to 225 MPa to meet the requirement of producing basal plate for cold rolling. Problems about ferrite rolling, ultra fine grain steel and a possible new type building materials have been discussed.

Keywords： HSLC steel     strengthening     softening     basal plate for cold rolling     super steel    

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Industrialization of the Advanced Technology in Continuous Casting of Steel

Gan Yong

Strategic Study of CAE 2002, Volume 4, Issue 9,   Pages 12-18

Abstract:

The characteristics of key technology in high-effective and thin-slab continuous casting of steel

Keywords： continuous casting of steel     high-effective continuous casting     thin slab continuous casting     soft reduction    

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Punching shear behavior of recycled aggregate concrete slabs with and without steel fibres

Jianzhuang XIAO, Wan WANG, Zhengjiu ZHOU, Mathews M. TAWANA

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 3,   Pages 725-740 doi: 10.1007/s11709-018-0510-6

Abstract: fibres could not only improve the energy dissipation capacity and the punching shear capacity of the slab, but also effectively improve the integrity of the slab tension surface and thereby changing the trend

Keywords： recycled aggregate concrete     steel fibres     slab     punching shear     recycled coarse aggregates replacement percentage    

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In-plane transversal normal stresses in the concrete face of CFRD induced by the first-dam reservoir filling

Neftalí SARMIENTO-SOLANO, Miguel P. ROMO

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 1,   Pages 81-91 doi: 10.1007/s11709-016-0378-2

Abstract: To evaluate the effects of dam height, valley narrowness and width of concrete slabs on the first-dam reservoir filling in-plane transversal normal stresses in the concrete face of CFRD´s, 3D finite difference analyses were carried out. Behavior of rockfill dams considered in this study was defined from the monitoring of a number of 3D sets of pressure cells and extensometers installed in three large dams in Mexico. The 3D analyses results show that high in-plane transversal compressive stresses develop within the concrete panels located in the central concrete face zone upon dam reservoir filling loading. Likewise, in-plane induced tensile transversal stresses in the zones near the abutments increase the potential of slabs cracking and damaging the waterstops in-between the vertical and perimetral joints. From the results of the 3D finite difference analyses, a simple method to estimate in-plane normal stresses in the concrete face is advanced and through comparisons with the results of a 3D case numerical study, its accuracy assessed.

Keywords： concrete face     CFR dams     reservoir filling     slab in-plane stresses    

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Vibration Serviceability of Large-span Steel–Concrete Composite Beam with Precast Hollow Core Slabs Under Walking Impact Article

Jiepeng Liu, Shu Huang, Jiang Li, Y. Frank Chen

Engineering 2022, Volume 19, Issue 12,   Pages 93-104 doi: 10.1016/j.eng.2021.04.025

Abstract:

A large-span steel–concrete composite beam with precast hollow core slabs (CBHCSs) is a relatively new floor structure that can be applied to various long-span structures. However, human-induced vibrations may present serviceability issues in such structures. To alleviate vibrations, both the walking forces excited by humans and the associated floor responses must be elucidated. In this study, 150 load–time histories of walking, excited by 25 test participants, are obtained using a force measuring plate. The dynamic loading factors and phase angles in the Fourier series functions for one-step walking are determined. Subsequently, walking tests are performed on seven CBHCS specimens to capture the essential dynamic properties of mode shapes, natural frequencies, damping ratios, and acceleration time histories. The CBHCS floor system generally exhibits a high frequency (> 10 Hz) and low damping (damping ratio < 2%). Sensitivity studies using the finite element method are conducted to investigate the vibration performance of the CBHCS floor system, where the floor thickness, steel beam type, contact time, and human weight are considered. Finally, analytical expressions derived for the fundamental frequency and peak acceleration agree well with the experimental results and are hence proposed for practical use.

Keywords： Composite beam     Hollow core slab     Walking force     Floor vibration     Mode shape    

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Research and Implementations of Structural Monitoring for Bridges and Buildings in Japan—A Review Review

Yozo Fujino, Dionysius M. Siringoringo, Yoshiki Ikeda, Tomonori Nagayama, Tsukasa Mizutani

Engineering 2019, Volume 5, Issue 6,   Pages 1093-1119 doi: 10.1016/j.eng.2019.09.006

Abstract:

This paper provides a review on the development of structural monitoring in Japan, with an emphasis on the type, strategy, and utilization of monitoring systems. The review focuses on bridge and building structures using vibration-based techniques. Structural monitoring systems in Japan historically started with the objective of evaluating structural responses against extreme events. In the development of structural monitoring, monitoring systems and collected data were used to verify design assumptions, update specifications, and facilitate the efficacy of vibration control systems. Strategies and case studies on monitoring for the design verification of long-span bridges and tall buildings, the performance of seismic isolation systems in building and bridges, the verification of structural retrofit, the verification of structural control systems (passive, semiactive, and active), structural assessment, and damage detection are described. More recently, the application
of monitoring systems has been extended to facilitate efficient operation and effective maintenance through the rationalization of risk and asset management using monitoring data. This paper also summarizes the lessons learned and feedback obtained from case studies on the structural monitoring of bridges and buildings in Japan.

Keywords： monitoring     Long-span bridge     High-rise building     Seismic monitoring     Wind-induced responses     Pavement and slab    

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Title Author Date Type Operation

Seismic tests of post-tensioned self-centering building frames with column and slab restraints

Chung-Che CHOU, Jun-Hen CHEN

Journal Article

Punching of reinforced concrete slab without shear reinforcement: Standard models and new proposal

Luisa PANI, Flavio STOCHINO

Journal Article

Key Technical Issues Related to Super-high Concrete Slab Dam

Ma Hongqi,Cao Keming

Journal Article

Effect of eccentricity in reinforced concrete beam-column-slab connection under cyclic loading

Rooh ULLAH, Amjad NASEER, Muhammad FAHIM, Mohammad ASHRAF, Eid BADSHAH

Journal Article

Study on anti crack design method for laminating crack at bottom slab in closure segment

Lin Haifeng,Zhang Dongdong and Zhao Qilin

Journal Article

Influence of loading ratio on flat slab connections at elevated temperature: A numerical study

Rwayda Kh. S. AL-HAMD, Martin GILLIE, Safaa Adnan MOHAMAD, Lee S. CUNNINGHAM

Journal Article

Applying the spectral stochastic finite element method in multiple-random field RC structures

Abbas YAZDANI

Journal Article

Strengthening and Softening of Ferrite+Pearlite Steels Produced by Thin Slab Casting and Rolling

Fu Jie,Wu Huajie,Liu Yangchun

Journal Article

Industrialization of the Advanced Technology in Continuous Casting of Steel

Gan Yong

Journal Article

Punching shear behavior of recycled aggregate concrete slabs with and without steel fibres

Jianzhuang XIAO, Wan WANG, Zhengjiu ZHOU, Mathews M. TAWANA

Journal Article

In-plane transversal normal stresses in the concrete face of CFRD induced by the first-dam reservoir filling

Neftalí SARMIENTO-SOLANO, Miguel P. ROMO

Journal Article

Vibration Serviceability of Large-span Steel–Concrete Composite Beam with Precast Hollow Core Slabs Under Walking Impact

Jiepeng Liu, Shu Huang, Jiang Li, Y. Frank Chen

Journal Article

Research and Implementations of Structural Monitoring for Bridges and Buildings in Japan—A Review

Yozo Fujino, Dionysius M. Siringoringo, Yoshiki Ikeda, Tomonori Nagayama, Tsukasa Mizutani

Journal Article