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A concept of capillary active, dynamic insulation integrated with heating, cooling and ventilation, air conditioning system

Mark BOMBERG

Frontiers of Structural and Civil Engineering 2010, Volume 4, Issue 4,   Pages 431-437 doi: 10.1007/s11709-010-0071-9

Abstract: When a historic fa?ade needs to be preserved or when the seismic considerations favor use of a concrete wall system and fire considerations limit exterior thermal insulation, one needs to use interior thermal insulation systems. Interior thermal insulation systems are less effective than the exterior systems and will not reduce the effect of thermal bridges. Yet they may be successfully used and, in many instances, are recommended as a complement to the exterior insulation. This paper presents one of these cases. It is focused on the most successful applications of capillary active, dynamic interior thermal insulation. This happens when such insulation is integrated with heating, cooling and ventilation, air conditioning (HVAC) system. Starting with a pioneering work of the Technical University in Dresden in development of capillary active interior insulations, we propose a next generation, namely, a bio-fiber thermal insulation. When completing the review, this paper proposes a concept of a joint research project to be undertaken by partners from the US (where improvement of indoor climate in exposed coastal areas is needed), China (indoor climate in non-air conditioned concrete buildings is an issue), and Germany (where the bio-fiber technology has been developed).

Keywords： conditioning (HVAC) and building enclosure     dynamic insulation     switchable thermal resistance     variable U-valuewalls    

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Slender reinforced concrete shear walls with high-strength concrete boundary elements

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 1,   Pages 138-151 doi: 10.1007/s11709-022-0897-y

Abstract: Reinforced concrete structural walls are commonly used for resisting lateral forces in buildings.In this study, the effects of strategic placement of HSC on the performance of slender walls were examined

Keywords： slender walls     high-strength concrete     rectangular and barbell-shaped walls     cold joints    

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Behaviour of self-centring shear walls——A state of the art review

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 1,   Pages 53-77 doi: 10.1007/s11709-022-0850-0

Abstract: The application of unbonded post-tensioning (PT) in structural walls has led to the development of advancedsliding, confinement, seismic performance factors, PT loss, PT force range and residual drifts of shear wallsThe established database was then used to review shear walls’ configurations, material, and componentsThe behaviour of concrete, masonry and timber shear walls were compared and critically analysed.understand the behaviour of self-centring wall system in order to develop design guidelines for such walls

Keywords： self-centring shear walls     rocking walls     energy dissipation     seismic performance factors     PT loss     residual    

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Self-centring segmental retaining walls—A new construction system for retaining walls

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 4,   Pages 980-1000 doi: 10.1007/s11709-021-0737-5

Abstract: Four post-tensioned segmental retaining walls (PSRWs) were experimentally tested.Each of the walls was constructed using seven T-shaped concrete segments with a dry stack.The walls were tested under incrementally increasing cyclic lateral load.

Keywords： retaining wall     segmental     precast concrete     unbonded post-tensioning     water retaining wall     seawall    

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Experiment and calculation on seismic behavior of RC composite core walls with concealed steel truss

Wanlin CAO , Weihua CHANG , Changjun ZHAO , Jianwei ZHANG ,

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 3,   Pages 255-261 doi: 10.1007/s11709-009-0043-0

Abstract: To improve the seismic performance of reinforced concrete core walls, reinforced concrete composite corewalls with concealed steel truss were proposed and systemically investigated.load-carrying capacity, stiffness, ductility, hysteretic behavior and energy dissipation of the core wallsThe test results showed that the seismic performance of core walls is improved greatly by the concealed

Keywords： reinforced concrete     steel truss     core walls     seismic performance    

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Seismic effects on reinforcement load and lateral deformation of geosynthetic-reinforced soil walls

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 4,   Pages 1001-1015 doi: 10.1007/s11709-021-0734-8

Abstract: Current design methods for the internal stability of geosynthetic-reinforced soil (GRS) walls postulateresistances in the mid and lower layers as evinced by compound failure frequently occurring in GRS wallsreinforcement are conducted to investigate seismic impacts on the stability and lateral deformation of GRS walls

Keywords： geosynthetics     reinforced soil     retaining walls     seismic performance    

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Modeling of shear walls using finite shear connector elements based on continuum plasticity

Ulf Arne GIRHAMMAR, Per Johan GUSTAFSSON, Bo KÄLLSNER

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 2,   Pages 143-157 doi: 10.1007/s11709-016-0377-3

Abstract: buildings are often stabilized against lateral loads by using diaphragm action of roofs, floors and wallsof the sheathing-to-framing joints has a significant impact on the structural performance of shear wallsThis paper is focused on the finite element modeling of shear walls.Load-displacement curves for shear walls are calculated using the shear connector model and they are

Keywords： shear walls     wall diaphragms     finite element modelling     plastic shear connector     analytical modelling     experimental    

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Effect of earth reinforcement, soil properties and wall properties on bridge MSE walls

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 5,   Pages 1209-1221 doi: 10.1007/s11709-021-0764-2

Abstract: Mechanically stabilized earth (MSE) retaining walls are popular for highway bridge structures.cohesion has a minor effect, while the movement increased by 13–20 mm for flexible geogrid reinforced wallscompared with the steel grid walls.

Keywords： mechanically stabilized earth walls     precast concrete panels     backfill soil     finite element modeling    

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Self-centering steel plate shear walls for improving seismic resilience

Patricia M. CLAYTON,Daniel M. DOWDEN,Chao-Hsien LI,Jeffrey W. BERMAN,Michel BRUNEAU,Laura N. LOWES,Keh-Chuan TSAI

Frontiers of Structural and Civil Engineering 2016, Volume 10, Issue 3,   Pages 283-290 doi: 10.1007/s11709-016-0344-z

Abstract: As part of a Network for Earthquake Engineering Simulation research project led by researchers at the University of Washington with collaborators at University at Buffalo, and Taiwan National Center for Research on Earthquake Engineering, a self-centering steel plate shear wall (SC-SPSW) system has been developed to achieve enhanced seismic performance objectives, including recentering. The SC-SPSW consists of thin steel infill panels, referred to as web plates that serve as the primary lateral load-resisting and energy dissipating element of the system. Post-tensioned (PT) beam-to-column connections provide system recentering capabilities. A performance-based design procedure has been developed for the SC-SPSW, and a series of nonlinear response history analyses have been conducted to verify intended seismic performance at multiple hazard levels. Quasi-static subassembly tests, quasi-static and shake table tests of scaled three-story specimens, and pseudo-dynamic tests of two full-scale two-story SC-SPSWs have been conducted. As a culmination of this multi-year, multi-institutional project, this paper will present an overview of the SC-SPSW numerical and experimental research programs. This paper will also discuss innovative PT connection and web plate designs that were investigated to improve constructability, resilience, and seismic performance and that can be applied to other self-centering and steel plate shear wall systems.

Keywords： self-centering     steel plate shear walls     large-scale experiment     post-tensioned connections     performance-based    

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Recent advances in geosynthetic-reinforced retaining walls for highway applications

Jie HAN, Yan JIANG, Chao XU

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 2,   Pages 239-247 doi: 10.1007/s11709-017-0424-8

Abstract: Geosynthetic-reinforced retaining (GRR) walls have been increasingly used to support roadways and bridgeIn recent years, advances have been made in construction and design of GRR walls for highway applicationsFor example, piles have been installed inside GRR walls to support bridge abutments and sound barrierwalls.Geosynthetic layers at closer spacing are used in GRR walls to form a composite mass to support an integrated

Keywords： bridge     geosynthetic     highway     reinforced     wall    

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Seismic retrofit of existing SRC frames using rocking walls and steel dampers

Akira WADA, Zhe QU, Shojiro MOTOYUI, Hiroyasu SAKATA

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 3,   Pages 259-266 doi: 10.1007/s11709-011-0114-x

Abstract: 11-story steel reinforced concrete frame that features the innovative use of post-tensioned rocking walls

Keywords： building structure     seismic retrofit     rocking wall     steel damper    

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Seismic fragility assessment of revised MRT buildings considering typical construction changes

Rakesh DUMARU, Hugo RODRIGUES, Humberto VARUM

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 1,   Pages 241-266 doi: 10.1007/s11709-019-0560-4

Abstract: modified through variable number of storeys (three, four, and five) and different arrangement of infill wallsThe application of infill walls increases the fundamental frequencies, stiffness, and maximum strengthThe vulnerability was also reduced through infill walls, where the probability of exceeding partial-collapseAnd increase in number of storeys causes building highly vulnerable although the infill walls were considered

Keywords： mid-rise buildings     revised NBC 205: 2012     masonry infill walls     configurations of infill walls     vulnerability    

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Multi-scale investigation of active failure for various modes of wall movement

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 4,   Pages 961-979 doi: 10.1007/s11709-021-0738-4

Abstract: Retained backfill response to wall movement depends on factors that range from boundary conditions to the geometrical characteristic of individual particles. Hence, mechanical understanding of the problem warrants multi-scale analyses that investigate reciprocal relationships between macro and micro effects. Accordingly, this study attempts a multi-scale examination of failure evolution in cohesionless backfills. Therefore, the transition of retained backfills from at-rest condition to the active state is modeled using the discrete element method (DEM). DEM allows conducting virtual experiments, with which the variation of particle and boundary properties is straightforward. Hence, various modes of wall movement (translation and rotation) toward the active state are modeled using two different backfills with distinct particle shapes (spherical and nonspherical) under varying surcharge. For each model, cumulative rotations of single particles are tracked, and the results are used to analyze the evolution of shear bands and their geometric characteristics. Moreover, dependencies of lateral pressure coefficients and coordination numbers, as respective macro and micro behavior indicators, on particle shape, boundary conditions, and surcharge levels are investigated. Additionally, contact force networks are visually determined, and their influences on pressure distribution and deformation mechanisms are discussed with reference to the associated modes of wall movement and particle shapes.

Keywords： discrete-element modelling     granular materials     retaining walls     particle shape     arching    

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Value Engineering/Value Management Model and Application of Aerospace Projects

Wan-hua Qiu,Han-peng Zhang,Ze-Shui Xu,De-Sheng Wu

Frontiers of Engineering Management 2015, Volume 2, Issue 4,   Pages 373-377 doi: 10.15302/J-FEM-2015056

Abstract: This paper presents a new space model developed by general value engineering/value management model.realization of the development object as the basic point, to get the final optimization structure by value

Keywords： aerospace project     value engineering     value optimization     value stream     design structure matrix    

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Higher heating value prediction of torrefaction char produced from non-woody biomass

Nitipong SOPONPONGPIPAT,Dussadeeporn SITTIKUL,Unchana SAE-UENG

Frontiers in Energy 2015, Volume 9, Issue 4,   Pages 461-471 doi: 10.1007/s11708-015-0377-3

Abstract: The higher heating value of five types of non-woody biomass and their torrefaction char was predicteddata, the mass fraction of fixed carbon and volatile matter had a strong effect on the higher heating valueanalysis data, the mass fraction of carbon, hydrogen, and oxygen had a strong effect on the higher heating value, while no relationship between the higher heating value and mass fractions of nitrogen and sulfur was

Keywords： higher heating value     correlation     biomass     proximate analysis     ultimate analysis    

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Title Author Date Type Operation

A concept of capillary active, dynamic insulation integrated with heating, cooling and ventilation, air conditioning system

Mark BOMBERG

Journal Article

Slender reinforced concrete shear walls with high-strength concrete boundary elements

Journal Article

Behaviour of self-centring shear walls——A state of the art review

Journal Article

Self-centring segmental retaining walls—A new construction system for retaining walls

Journal Article

Experiment and calculation on seismic behavior of RC composite core walls with concealed steel truss

Wanlin CAO , Weihua CHANG , Changjun ZHAO , Jianwei ZHANG ,

Journal Article

Seismic effects on reinforcement load and lateral deformation of geosynthetic-reinforced soil walls

Journal Article

Modeling of shear walls using finite shear connector elements based on continuum plasticity

Ulf Arne GIRHAMMAR, Per Johan GUSTAFSSON, Bo KÄLLSNER

Journal Article

Effect of earth reinforcement, soil properties and wall properties on bridge MSE walls

Journal Article

Self-centering steel plate shear walls for improving seismic resilience

Patricia M. CLAYTON,Daniel M. DOWDEN,Chao-Hsien LI,Jeffrey W. BERMAN,Michel BRUNEAU,Laura N. LOWES,Keh-Chuan TSAI

Journal Article

Recent advances in geosynthetic-reinforced retaining walls for highway applications

Jie HAN, Yan JIANG, Chao XU

Journal Article

Seismic retrofit of existing SRC frames using rocking walls and steel dampers

Akira WADA, Zhe QU, Shojiro MOTOYUI, Hiroyasu SAKATA

Journal Article

Seismic fragility assessment of revised MRT buildings considering typical construction changes

Rakesh DUMARU, Hugo RODRIGUES, Humberto VARUM

Journal Article

Multi-scale investigation of active failure for various modes of wall movement

Journal Article

Value Engineering/Value Management Model and Application of Aerospace Projects

Wan-hua Qiu,Han-peng Zhang,Ze-Shui Xu,De-Sheng Wu

Journal Article

Higher heating value prediction of torrefaction char produced from non-woody biomass

Nitipong SOPONPONGPIPAT,Dussadeeporn SITTIKUL,Unchana SAE-UENG

Journal Article