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Journal articles on the topic 'Age-Adjusted Effective Modulus'

Author: Grafiati

Published: 4 June 2021

Last updated: 14 February 2022

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1

Khazanovich, L. "Age‐Adjusted Effective Modulus Method for Time‐Dependent Loads." Journal of Engineering Mechanics 116, no. 12 (1990): 2784–89. http://dx.doi.org/10.1061/(asce)0733-9399(1990)116:12(2784).

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2

Han, Bing, and Yuan Feng Wang. "Age-Adjusted Effective Modulus Method for Creep of High-Performance Concrete." Key Engineering Materials 302-303 (January 2006): 693–99. http://dx.doi.org/10.4028/www.scientific.net/kem.302-303.693.

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This paper discusses the suitability of using several creep theories of common concrete for creep of high-performance concrete (HPC). Based on the Age-Adjusted Effective Modulus method (AEMM) for creep of concrete, Improved Dischinger (ID) method and the Elastic Continuation and Plastic Flow (ECPF) theory for calculating relaxation coefficient and considering characteristics of HPC, a method is set up for calculating the creep of HPC under changing stresses, and comparing results gotten by the method with some experimental data, it can be considered that the above methods are suit for the calc

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3

Kovler, K. "Drying creep of concrete in terms of the age-adjusted effective modulus method." Magazine of Concrete Research 49, no. 181 (1997): 345–51. http://dx.doi.org/10.1680/macr.1997.49.181.345.

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4

Wang, Weinan, and Jinxin Gong. "New relaxation function and age-adjusted effective modulus expressions for creep analysis of concrete structures." Engineering Structures 188 (June 2019): 1–10. http://dx.doi.org/10.1016/j.engstruct.2019.03.009.

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5

Zvolánek, Lukáš, and Ivailo Terzijski. "Relaxation of Structural Concrete due to its Shrinkage in Terms of Age-Adjusted Effective Modulus Method." Key Engineering Materials 737 (June 2017): 471–76. http://dx.doi.org/10.4028/www.scientific.net/kem.737.471.

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This paper focuses on the calculation of residual stresses due to shrinkage with a tensile creep effect. Whereas the shrinkage of concrete causes stresses in the material, the tensile creep counteracts the shrinkage as a stress relaxation mechanism. The main objective of this paper is to evaluate the ageing coefficient c (referred to as Trost-Bazant Coefficient) reflecting the load history. The coefficient is used for the residual stress analysis by means of a simplified method called Age-adjusted Effective Modulus Method. The tensile creep effect was evaluated according to the rheological mod

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6

Batchelor, B. DeV, Jayanth Srinivasan, and Mark F. Green. "Losses in partially prestressed concrete." Canadian Journal of Civil Engineering 15, no. 5 (1988): 890–99. http://dx.doi.org/10.1139/l88-114.

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The calculation of prestress losses by the age-adjusted effective modulus method is analyzed and compared with the Ontario highway bridge design code predictions for partially prestressed concrete. Specifically, the effect of nonprestressed reinforcement on prestress losses is studied. The age-adjusted effective modulus method for calculating prestress losses is outlined, and plots of prestress losses versus partial prestressing ratio are presented and analyzed. It is shown that prestress losses decrease with increasing amounts of nonprestressed reinforcement. Also, the Ontario highway bridge

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7

Bae, Doo-Byong, Chang-Kook Oh, and Sok-Hwan Choi. "Experimental Verification of Age-adjusted Effective Modulus Method to Long-Term Behavior Estimation of Prestressed Composite Girders." Journal of Korean Society of Steel Construction 24, no. 5 (2012): 571–82. http://dx.doi.org/10.7781/kjoss.2012.24.5.571.

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8

Ge, Jun Ying, and Hao Zhang. "Practical Method for Concrete Creep Calculation Based on ANSYS." Advanced Materials Research 255-260 (May 2011): 1915–19. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.1915.

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For concrete bridge, creep effect throughout the whole process that from construction to the entire service life, and it has large effect on internal force and deformation of the bridge, therefore, accurate calculation of the effect is very meaningful. In this paper, we put up the detailed implementation calculation in the ANSYS based on “Age-Adjusted Effective Modulus Method (AEMM)”. Finally the author verified by the example.

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9

Zvolánek, Lukáš, and Ivailo Terzijski. "Methods Considering the Concrete Creep due to Shrinkage." Solid State Phenomena 259 (May 2017): 3–8. http://dx.doi.org/10.4028/www.scientific.net/ssp.259.3.

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Creep of concrete is a phenomenon that is not only significant in the long term, but also at young concrete. The paper deals with methods considering the tensile creep of concrete due to shrinkage. It was proved, that the tensile creep can be taken into account by simplified methods called Age-adjusted Effective Modulus Method with the ageing coefficient χvalue falling between 0.4 and 0.45. Calculated values were experimentally verified by means of Ring-test.

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10

Mu, Guang Bo, and Lian Guang Wang. "Deformation Calculation of Prestressed Steel Reinforced Concrete Beam under Long-Term Loading." Advanced Materials Research 243-249 (May 2011): 871–74. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.871.

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The deformation calculation formulas under long-term and different loading of prestressed steel reinforced concrete beams are built up by using age adjusted effective modulus method according to internal force equilibrium and strain harmony of section. Based on that, numerical methods are applied to calculate and analyze stress redistribution of steel and concrete, deformation of beam in different time slice, as well as the curves about how concrete strength, axial force, moment, volumetric percentage of steel and volumetric percentage of tendon affects mid-span deformation of long-term loadin

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11

Chen, Zhou Yi, Yang Wang, and Jian Qing Wu. "Long-Term Deformations of Steel-Reinforced Concrete Columns under Sustained Axial Loads." Applied Mechanics and Materials 351-352 (August 2013): 645–49. http://dx.doi.org/10.4028/www.scientific.net/amm.351-352.645.

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Steel-reinforced concrete (SRC) columns have been widely used over the past few decades. However, very limited research has been conducted on the time-dependent behavior of these columns caused by creep and shrinkage under sustained loading. This paper presents the results of an experimental study of the long-term behavior of short SRC columns under sustained axial loading. Long-term axial deformations due to shrinkage and creep of the concrete were recorded. In analysis of the test results, time analysis of the SRC columns under sustained axial loads using the age-adjusted effective modulus m

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12

Wang, Rong Xia, Fan Li, Rong Guo, and Shao Wei Zhao. "The Influence of Concrete Creep on Deflection of Box Beam with Sectional Joints in Continuous Rigid Frame Bridge." Advanced Materials Research 446-449 (January 2012): 1063–66. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.1063.

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Over-deflection of beam in continuous rigid frame bridge has become an serious problem in recent years. The reason is complex. Some reseachers think that the bad quality of sectional joints in cantilever construction will cause additional shearing deformation and affect the beam deflection, this idea need to be further studied. In the paper, two three-dimensional models are built up based on a factual bridge, the simulation method of sectinoal joints is studied. The influence of concrete creep on the deflection of box beam with sectional joints is analysed being compared to beam without sectio

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13

Luo, Kai, Yong Lin Pi, Wei Gao, and Mark A. Bradford. "Finite Element Model for Analysis of Time-Dependent Behaviour of Concrete-Filled Steel Tubular Arches." Applied Mechanics and Materials 553 (May 2014): 606–11. http://dx.doi.org/10.4028/www.scientific.net/amm.553.606.

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This paper presents a finite element model for the linear and nonlinear analysis of time-dependent behaviour of concrete-filled steel tubular (CFST) arches. It is known when a CFST arch is subjected to a sustained load, the visco-elastic effects of creep in the concrete core will result in significant increases of the deformations and internal forces in the long-term. In this paper, a finite element model is developed using the age-adjusted effective modulus method to describe the creep behaviour of the concrete core. The finite element results of long-term displacement and stress redistributi

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14

Wang, Guang-Ming, Li Zhu, Guang-Pan Zhou, Bing Han, and Wen-Yu Ji. "Experimental Research of the Time-Dependent Effects of Steel–Concrete Composite Girder Bridges during Construction and Operation Periods." Materials 13, no. 9 (2020): 2123. http://dx.doi.org/10.3390/ma13092123.

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The present work aimed to study the effects of temperature changes and concrete creep on I-shaped steel–concrete composite continuous girder bridges during construction and operation processes. This study combined structural health monitoring data, an ANSYS finite element simulation, and the age-adjusted effective modulus method to obtain the variation laws of temperature and internal force in composite girders. Moreover, a temperature gradient model was proposed that is suitable for bridges in Hebei, China. In addition, a concrete creep experiment under unidirectional axial compression was pe

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15

Zhou, Guangpan, Aiqun Li, Jianhui Li, Maojun Duan, Zhiyuan Xia, and Li Zhu. "Determination and Implementation of Reasonable Completion State for the Self-Anchored Suspension Bridge with Extra-Wide Concrete Girder." Applied Sciences 9, no. 12 (2019): 2576. http://dx.doi.org/10.3390/app9122576.

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The present work is aimed at studying the determination method and implementation process of reasonable completion state for the Hunan Road Bridge, which is currently the widest concrete self-anchored suspension bridge in China. The global finite element model and the cable analytic program BNLAS were integrated. The synthesis algorithm of completion state determination was proposed. The contact relationships between the cable and saddles were captured using the refined FE discretization method. The concrete shrinkage and creep effects during the construction and operation periods were predict

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16

Wang, Guang-Ming, Li Zhu, Xin-Lin Ji, and Wen-Yu Ji. "Finite Beam Element for Curved Steel–Concrete Composite Box Beams Considering Time-Dependent Effect." Materials 13, no. 15 (2020): 3253. http://dx.doi.org/10.3390/ma13153253.

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Curved steel–concrete composite box beams are widely used in urban overpasses and ramp bridges. In contrast to straight composite beams, curved composite box beams exhibit complex mechanical behavior with bending–torsion coupling, including constrained torsion, distortion, and interfacial biaxial slip. The shear-lag effect and curvature variation in the radial direction should be taken into account when the beam is sufficiently wide. Additionally, long-term deflection has been observed in curved composite box beams due to the shrinkage and creep effects of the concrete slab. In this paper, an

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17

Marčiukaitis, Gediminas, and Robertas Balevičius. "STRESS, STRAIN AND CREEP ANALYSIS OF THE LAYERED COMPOSITE STRUCTURES UNDER SUSTAINED LOADING." Engineering Structures and Technologies 1, no. 3 (2009): 123–34. http://dx.doi.org/10.3846/skt.2009.15.

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The paper proposes numerical and analytical models of the time-dependent analysis of a multilayered composite. These models enable us to predict the time-dependent behaviour of composite structures made of materials having age-variable properties. The proposed numerical model deals with a numerical solution of linear Volterra integral equation implying the validity of the principle of superposition for the layers. Meanwhile, the proposed analytical approach is based on the application of the age-adjusted effective modulus method for the composite. The validity of these models has been proven b

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18

Avedzi, Hayford, Allison Soprovich, Stephanie Ramage, et al. "Healthy Eating and Active Living for Diabetes-Glycemic Index (HEALD-GI): A Pragmatic Randomized Controlled Trial." Current Developments in Nutrition 4, Supplement_2 (2020): 1289. http://dx.doi.org/10.1093/cdn/nzaa059_006.

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Abstract Objectives Rigorous evidence is needed to support uptake of recommendations to include low glycemic index (GI) foods in daily meal planning as an effective dietary self-care strategy for people with type 2 diabetes (T2D). We evaluated the effectiveness of a 12-week web-based GI-targeted nutrition education intervention on dietary intakes and GI-related knowledge among adults with T2D. Methods Participants were randomized to a control group (n = 34) that received standard printed copies of Canada's Food Guide and Diabetes Canada's GI resources or an intervention group (n = 33) that rec

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19

Balanova, Yu A., S. A. Shalnova, V. A. Kutsenko, et al. "Contribution of hypertension and other risk factors to survival and mortality in the Russian population." Cardiovascular Therapy and Prevention 20, no. 5 (2021): 3003. http://dx.doi.org/10.15829/1728-8800-2021-3003.

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Aim. To study the contribution of hypertension (HTN) to survival and mortality in the Russian population.Material and methods. This prospective observational cohort included representative samples from 11 Russian regions (men and women aged 25-64 years, n=18251) examined in 2012-2014 as part of the Epidemiology of Cardiovascular Diseases and their Risk Factors in Regions of Russian Federation (ESSE-RF) study. The examination included a questionnaire (12 modules), anthropometric and blood pressure (BP) measurements, as well as biochemical blood tests. HTN was considered aa a systolic BP ≥140 mm

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20

El Morr, Christo, Paul Ritvo, Farah Ahmad, and Rahim Moineddin. "Effectiveness of an 8-Week Web-Based Mindfulness Virtual Community Intervention for University Students on Symptoms of Stress, Anxiety, and Depression: Randomized Controlled Trial." JMIR Mental Health 7, no. 7 (2020): e18595. http://dx.doi.org/10.2196/18595.

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Background A student mental health crisis is increasingly acknowledged and will only intensify with the COVID-19 crisis. Given accessibility of methods with demonstrated efficacy in reducing depression and anxiety (eg, mindfulness meditation and cognitive behavioral therapy [CBT]) and limitations imposed by geographic obstructions and localized expertise, web-based alternatives have become vehicles for scaled-up delivery of benefits at modest cost. Mindfulness Virtual Community (MVC), a web-based program informed by CBT constructs and featuring online videos, discussion forums, and videoconfer

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21

Hess, Viviane, Astrid Grossert, Judith Alder, et al. "Web-based stress management for newly diagnosed cancer patients (STREAM): A randomized, wait-list controlled intervention study." Journal of Clinical Oncology 35, no. 18_suppl (2017): LBA10002. http://dx.doi.org/10.1200/jco.2017.35.18_suppl.lba10002.

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LBA10002 Background: Being diagnosed with cancer causes major distress, yet the majority of newly diagnosed cancer patients (pts) lack psychological support. Internet interventions overcome many barriers for seeking support. We assess efficacy and feasibility of a web-based minimal-contact stress management intervention (STREAM) for newly diagnosed cancer pts. Methods: In a prospective, wait-list controlled trial, newly diagnosed cancer pts were randomized within 12 weeks of starting anti-cancer treatment to an immediate or delayed (control group) 8-week, web-based intervention. The interventi

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22

Bringhen, Sara, Luděk Pour, Reuben Benjamin, et al. "Progression-Free Survival (PFS) Benefit Demonstrated and Quality of Life (QoL) Maintained across Age and Frailty Subgroups with the Oral Proteasome Inhibitor (PI) Ixazomib Vs Placebo As Post-Induction Maintenance Therapy in Non-Transplant Newly Diagnosed Multiple Myeloma (NDMM) Patients (Pts): Analysis of the TOURMALINE-MM4 Phase 3 Trial." Blood 136, Supplement 1 (2020): 30–31. http://dx.doi.org/10.1182/blood-2020-136293.

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Background Maintenance therapy improves PFS in NDMM pts. Additional active, well-tolerated treatment options that are suitable for long-term administration are required. The international, multicenter, double-blind, placebo-controlled, phase 3 TOURMALINE-MM4 trial (NCT02312258) of the oral PI ixazomib as maintenance therapy post-induction in non-transplant NDMM pts met its primary endpoint of PFS. Ixazomib demonstrated a significant and clinically meaningful benefit vs placebo, with a manageable and well-tolerated toxicity profile. Feasible, tolerable options for long-term therapy are particul

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23

Lobban, Fiona, Nadia Akers, Duncan Appelbe, et al. "A web-based, peer-supported self-management intervention to reduce distress in relatives of people with psychosis or bipolar disorder: the REACT RCT." Health Technology Assessment 24, no. 32 (2020): 1–142. http://dx.doi.org/10.3310/hta24320.

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Background Relatives caring for people with severe mental health problems find information and emotional support hard to access. Online support for self-management offers a potential solution. Objective The objective was to determine the clinical effectiveness and cost-effectiveness of an online supported self-management tool for relatives: the Relatives’ Education And Coping Toolkit (REACT). Design and setting This was a primarily online (UK), single-blind, randomised controlled trial, comparing REACT plus a resource directory and treatment as usual with the resource directory and treatment a

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