Time-dependent behaviour of circular steel tube confined reinforced concrete (STCRC) stub columns subjected to low axial load
TL;DR: In this article, a numerical model was proposed for calculating the long-term deformation of STCRC stub columns based on the cross-sectional analysis method and the step-by-step method, and was benchmarked against the available test results.
About: This article is published in Engineering Structures.The article was published on 2021-09-15. It has received 11 citations till now.
Citations
More filters
TL;DR: In this paper , the effects of long-term behaviour on the dynamic strength of CFST arch bridges are analyzed and discussed in detail, and a novel dynamic stability analysis method for structures subjected to any arbitrary excitations is proposed and validated.
3 citations
TL;DR: In this paper , a confined concrete creep model was determined based on the collected 56 creep tests on sealed confined concrete under multiaxial stress states, accounting for the time-dependent varying confinement effects and the influence of the non-uniform interfacial stress distribution.
3 citations
TL;DR: In this paper , an experimental program on the seismic behavior of circular tubed reinforced concrete (CTRC) columns to reinforced concrete beam frames was presented, where two half-scale two-story CTRC frames with two bays in each frame were designed and tested under quasi-static loads.
Abstract: The tubed reinforced concrete (TRC) column is a special kind of concrete‐filled tube (CFT) column where the steel tube is disconnected at the beam–column connection, thereby not directly carrying the axial load while maximizing the confinement effect. Extensive research has been conducted to study the static and seismic performances of TRC columns and their mechanical properties. However, little attention has been paid to study the whole structural system containing TRC columns. To fill this lacking information, an experimental program on the seismic behavior of circular tubed reinforced concrete (CTRC) column to reinforced concrete (RC) beam frames (CTRC frames) was presented in this study for the first time. Two half‐scale two‐story CTRC frames, with two bays in each frame, were designed and tested under quasi‐static loads. The first frame has strong columns and weak beams; while the second frame has rather weak columns and strong beams, implying that plastic hinges may form in the columns under seismic action. The test results indicate that both frames are sufficiently ductile to effectively dissipate energy. However, for the second frame, more severe damages of beams and columns in the first floor were observed, resulting in the instability of the overall frame. A fiber‐based finite‐element model is established using OpenSees; and the numerical results are generally in good agreement with the test results. Utilizing the numerical model, a parametric study is conducted and the preliminary design suggestions on TRC frames are proposed.
2 citations
TL;DR: In this article , a static and dynamic analysis of tubed reinforced concrete (CTRC) columns and steel beams was performed to study the seismic performance of TRC columns in high-rise buildings.
2 citations
TL;DR: In this paper , the behavior of CTSRC columns with high-strength concrete (HSC) was evaluated and a parametric model was established and validated for further investigating the column behavior.
1 citations
References
More filters
TL;DR: In this paper, a stress-strain model for concrete subjected to uniaxial compressive loading and confined by transverse reinforcement is developed for concrete sections with either spiral or circular hoops, or rectangular hoops with or without supplementary cross ties.
Abstract: A stress‐strain model is developed for concrete subjected to uniaxial compressive loading and confined by transverse reinforcement. The concrete section may contain any general type of confining steel: either spiral or circular hoops; or rectangular hoops with or without supplementary cross ties. These cross ties can have either equal or unequal confining stresses along each of the transverse axes. A single equation is used for the stress‐strain equation. The model allows for cyclic loading and includes the effect of strain rate. The influence of various types of confinement is taken into account by defining an effective lateral confining stress, which is dependent on the configuration of the transverse and longitudinal reinforcement. An energy balance approach is used to predict the longitudinal compressive strain in the concrete corresponding to first fracture of the transverse reinforcement by equating the strain energy capacity of the transverse reinforcement to the strain energy stored in the concret...
6,261 citations
Book•
01 Jun 1985
TL;DR: In this paper, the authors present a review of elementary mechanics of materials and their application in the field of energy engineering, including failure and failure criteria, stress, principal stresses, and strain energy.
Abstract: 1. Orientation, Review of Elementary Mechanics of Materials. 2. Stress, Principal Stresses, Strain Energy. 3. Failure and Failure Criteria. 4. Applications of Energy Methods. 5. Beams on an Elastic Foundation. 6. Curved Beams. 7. Elements of Theory of Elasticity. 8. Pressurized Cylinders and Spinning Disks. 9. Torsion. 10. Unsymmetric Bending and Shear Center. 11. Plasticity in Structural Members. Collapse Analysis. 12. Plate Bending. 13. Shells of Revolution with Axisymmetric Loads. 14. Buckling and Instability. References. Index.
1,200 citations
Book•
01 Jan 1983
TL;DR: The creep of plain and structural concrete as mentioned in this paper, a.k.a., the "deformation of concrete", is a metaphor for the "creep of plain concrete" and "decrease of structural concrete".
Abstract: Creep of plain and structural concrete , Creep of plain and structural concrete , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
418 citations
Book•
15 Sep 2010
TL;DR: Time-dependent deformation background Creep of concrete Shrinkage of concrete Time-Analysis - The Basic Problem Material Properties Concrete Steep Reinforcement References Design for Serviceability - Deflection and Crack Control Introduction Design Objectives and Criteria Design Actions Design Criteria for Servicability Maximum Span-to-Depth Ration Minimum Thickness Deflection Control by Simplified Calculation Crack Control References Uncracked Sections - Axial Loading Preamble The Effective Modulus Method The Principle of Superposition - Step-by-Step Method The Age-Adjusted Effect Modulus method (
Abstract: Time-Dependent Deformation Background Creep of Concrete Shrinkage of Concrete Time-Analysis - The Basic Problem Material Properties Concrete Steep Reinforcement References Design for Serviceability - Deflection and Crack Control Introduction Design Objectives and Criteria Design Actions Design Criteria for Servicability Maximum Span-to-Depth Ration Minimum Thickness Deflection Control by Simplified Calculation Crack Control References Uncracked Sections - Axial Loading Preamble The Effective Modulus Method The Principle of Superposition - Step-by-Step Method The Age-Adjusted Effect Modulus Method (AEMM) The Rate of Creep Method (RCM) Comparison of Methods of Analysis Uncracked Sections - Axial Force and Uniaxial Bending Uncracked Sections - Axial Force and Biaxial Bending Introductory Remarks Overview of Cross-Sectional Analysis Short-Term Analysis of Reinforced or Prestressed Concrete Cross Sections Long-Term Analysis of Reinforced or Prestressed Concrete Cross Sections Using the Age Adjusted Effective Modulus Long-Term Analysis of Reinforced Prestressed Concrete Cross Section Using the Step-by-Step Procedure Composite Steel-Concrete Cross Sections References Cracked Sections Introductory Remarks Short-Term Analysis Time-Dependent Analysis (AEMM) Short- and Long-Term Analysis Using the Step-by-Step Method References Members and Structures Introductory Remarks Deflection of Statically Determinate Beams Statically Indeterminate Beams and Slabs Two-Way Slab Systems Slender Reinforced Concrete Columns Temperature Effects Concluding Remarks References Stiffness Method and Finite Element Modelling Introduction Overview of the Stiffness Method Member Loads Time Analysis Using AEMM Time Analysis Using SSM Time Analysis Using the Finite Element Method Analysis of Cracked Members References Appendix: Analytical Formulations - Euler-Bernoulli Beam Model
211 citations
TL;DR: In this paper, a reinforced concrete beam finite element with continuous slip is proposed to account for the slip between the reinforcing bars and the surrounding concrete, and the model applies to any cross-sectional shape under biaxial bending and both monotonic and cyclic loads.
Abstract: This paper presents a new reinforced concrete beam finite element that explicitly accounts for the slip between the reinforcing bars and the surrounding concrete. The element formulation combines the fiber- section model with the finite-element model of a reinforcing bar with continuous slip. The section model retains the plane-section assumption, but the steel fiber strains are computed as the sum of two contributions, the rebar deformation and the anchorage slip. The model applies to any cross-sectional shape under biaxial bending and both monotonic and cyclic loads. The model theoretical framework is presented first. A sensitivity study on the monotonic and cyclic response of a reinforcing bar shows how the model traces the bar's reduced initial stiffness, bond degradation, and anchorage loss for insufficient anchorage length. Finally, comparison with an experimental test on a circular column shows that the prediction with the new model is in good agreement with the test, whereas the original fiber model with perfect bond overestimates the hysteretic energy dissipated during the loading cycles. element to the analysis of RC structures, the introduction of the mechanics of bond-slip of the reinforcing bars appears to be a necessary enhancement toward a realistic description of the cyclic and ultimate behavior of RC structures. Rubiano- Benavides (1998) proposed the use of rotational springs at the element ends to account for the added flexibility due to bond- slip. This approach is more suitable for lumped plasticity mod- els and requires particular care in the selection of the rotational spring's mechanical properties. The framework of the pro- posed model is that of the fiber model, where the rebar re- sponse is modified to account for the effects of bond-slip. The basic idea is to merge the formulation of the reinforcing bar with bond-slip proposed by Monti et al. (1997a,b) into the force-based fiber element proposed by Spacone et al. (1996a). The framework of the fiber-section state determination is re- tained, and a new approach is proposed to compute the rebar stress and stiffness that includes the effects of slip. In the new model, the steel fiber accounts not only for the response of the rebar inside the beam, but also for its anchor- age outside the element, in either a structural joint or a footing. The steel fiber strain is given by the sum of the effects of the rebar deformation and the anchorage slip. The response is still computed in terms of fiber stress and stiffness, which are needed for the fiber-section state determination. An attractive feature of this formulation is the possibility of tracing the response of each bar within a section, which is particularly important when each rebar undergoes a different load history. Therefore, the model is suitable for sections of general shape, including circular ones, and for sections under biaxial loading. The theoretical framework of the new model is presented first, followed by a series of parametric studies on the perfor- mance of the new model. Finally, the results from an experi- mental test are compared with the prediction obtained with the proposed model.
163 citations