scholarly journals Equivalent Frame Model with a Decaying Nonlinear Moment-Curvature of Steel-Reinforced Concrete Joints

2019 ◽  
Vol 9 (24) ◽  
pp. 5533 ◽  
Author(s):  
Isaac Montava ◽  
Ramón Irles ◽  
Luis Estevan ◽  
Ismael Vives
Keyword(s):  
Reinforced Concrete ◽  
Frame Analysis ◽  
3D Models ◽  
Frame Structures ◽  
Steel Reinforced Concrete ◽  
Solid Models ◽  
Equivalent Frame ◽  
Concrete Joints ◽  
Critical Phases ◽  
The Moment

A numerical model for the analysis of frame structures that is capable of reproducing the behavior of reinforced concrete (RC) members and steel-reinforced concrete (SRC) members in all steps until collapse by simulating a reduced resistance capacity is presented in this work. Taking into account the solid models obtained in previous research that have been validated by experimental results, moment-curvature graphics were obtained in all steps: elastic, plastic, and post-critical to collapse. Beam models versus 3D models considerably simplified the calculation of frame structures and correctly described both the plastic and post-critical phases. The moment-curvature graph can be used in a simplified frame analysis, from post critical behavior to collapse.

scholarly journals Simplified Time-Dependent Column Shortening Analysis in Special Reinforced Concrete Moment Frames

2017 ◽  
Vol 62 (1) ◽  
pp. 232-249 ◽  
Author(s):  
Mohammad Jalilzadeh Afshari ◽  
Ali Kheyroddin ◽  
Majid Gholhaki
Keyword(s):  
Reinforced Concrete ◽  
Frame Structures ◽  
Moment Frames ◽  
Moment Frame ◽  
High Rise ◽  
Geometrical Characteristics ◽  
Time Changes ◽  
The Moment ◽  
Long Term Behavior

Necessity for adaption of high-rise reinforced concrete structures’ design and practical steps of implementation through nonlinear staged analysis by consideration of long-term behavior of concrete have always been strongly recommended by researchers in recent years. Cumulative column shortening in conventional analyses is the most important consequence of neglecting the above issues. In this article, numerous modeling and extensive nonlinear staged analyses are carried out on structures with different geometrical characteristics and extremely simple empirical equations to estimate column shortening caused by creep, shrinkage and time changes of modulus of elasticity are provided in such a way that these relations can be independent of conventional parameters of ACI209R-92 regulations used in prediction of mentioned axial strains. Results obtained from validation of the proposed equations show high compliance of all proposed equations for up to 30 floors and also show accuracy of proposed shrinkage equation for the moment frame structures higher than the studied range.

Research on Quantified Performance Index for Steel Reinforced Concrete Frame Structures

2011 ◽  
Vol 368-373 ◽  
pp. 3353-3356
Author(s):  
Qiu Wei Wang ◽  
Qing Xuan Shi ◽  
Liu Jiu Tang
Keyword(s):  
Reinforced Concrete ◽  
Performance Index ◽  
Frame Structures ◽  
Reinforced Concrete Frame ◽  
Steel Reinforced Concrete ◽  
Concrete Frame ◽  
Performance Based Seismic Design ◽  
Reinforced Concrete Frame Structures ◽  
Relationship Of ◽  
Theoretical Results

The interstory drift of frame structures is caused by beams, columns and joints. The calculation formula of storey yield drift for reinforced concrete frame structures is obtained by adding above three kind of deformation, and the comparative analysis show that theoretical results have good consistency with experimental data. The expression formula of storey yield drift angle for steel reinforced concrete (SRC) frame structures are analyzed by using the same hypothesis and methods, and quantified performance index for SRC frames having a certain guarantee value are proposed according to relationship of four seismic performance levels. The conclusion obtained provide basic information for performance-based seismic design of SRC frame structures.

scholarly journals Experimental Studies on Seismic Performance of Precast Steel Reinforced Concrete Frame and Connections

2015 ◽  
pp. 349-357
Author(s):  
Xiang Hu ◽  
Weichen Xue ◽  
Yanbo Sun ◽  
Chenguang Li
Keyword(s):  
Reinforced Concrete ◽  
Energy Dissipation ◽  
Cyclic Loading ◽  
Seismic Performance ◽  
Experimental Studies ◽  
Frame Structures ◽  
Seismic Zone ◽  
Reversed Cyclic Loading ◽  
Steel Reinforced Concrete ◽  
Reversed Cyclic

A new type of precast steel reinforced concrete (PSRC) frame, which were composed of composite steel reinforced concrete (CSRC) beam, PSRC column and cast-in-situ (CIS) joint, were proposed in this paper. The assemble technique used in the ordinary steel structures were adopted in PSRC frames to improve the construction efficiency. The seismic performance of PSRC frame structures was investigated based on the test results of connections and frame. Firstly, full-scale internal connection specimens, including a CIS connection specimen RCJ-1 and a PSRC connection specimen PCJ-1, were tested under low reversed cyclic loading. Results revealed that both the specimens RCJ-1 and PCJ-1 exhibited similar performance in terms of loading capacity, stiffness degradation and energy dissipation. The ductility of specimen PCJ-1 was about 3.81, which was a little lower than the specimen RCJ-1. Then, a 1/3-scale PSRC frame structure specimen, namely PCF-1, was tested under low reversed cyclic loading. Results showed that the PSRC frame specimen PCF-1 was failed in mixed failure mechanism, which provide good energy dissipation capacity. The ductility coefficient of PCF-1 was about 3.45 indicating that the PCF-1 behaved in ductility manner. The results of this investigation could enrich the data available documenting the behavior of PSRC frame, and contribute to enlarge the application of PSRC frame structures in seismic zone.

scholarly journals Numerical Simulation of Steel Reinforced Concrete (SRC) Joints

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 131 ◽  
Author(s):  
Isaac Montava ◽  
Ramon Irles ◽  
Jorge Segura ◽  
Jose Gadea ◽  
Ernesto Juliá
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Finite Element Model ◽  
Numerical Models ◽  
Experimental Tests ◽  
Element Model ◽  
Reinforced Concrete Beams ◽  
Plastic Behavior ◽  
Steel Reinforced Concrete ◽  
Concrete Joints

This paper presents a three-dimensional finite element model to confirm experimental tests carried out on steel reinforced concrete joints. The nonlinear behavior of this concrete is simulated, along with its reduced capability to resist large displacements in compression. The aim was to obtain the plastic behavior of reinforced concrete beams with a numerical model in the same way as obtained experimentally, in which the reduction of strength in the post-critical stage was considered to simulate behavior until structures collapsed. To do this, a nonlinear calculation was necessary to simulate the behavior of each material. Three numerical models provide a moment–curvature graph of the cross-section until collapse. Simulation of the structural elements is a powerful tool that avoids having to carry out expensive experimental tests. From the experimental results a finite element model is simulated for the non-linear analysis of steel reinforced concrete joints. It is possible to simulate the decreasing stress behavior of the concrete until reaching considerable displacement. A new procedure is discussed to capture the moment-curvature diagram. This diagram can be used in a simplified frame analysis, considering post-critical behavior for future research.

scholarly journals Experimental Study on Behavior of Shear Connectors Embedded in Steel-Reinforced Concrete Joints

2018 ◽  
Author(s):  
Riko Nakamori ◽  
Yuki Kageyama ◽  
Nozomu Baba
Keyword(s):  
Experimental Study ◽  
Reinforced Concrete ◽  
Bond Strength ◽  
Concrete Member ◽  
Steel Reinforced Concrete ◽  
Shear Connectors ◽  
Reinforced Concrete Member ◽  
Average Maximum ◽  
Concrete Joints ◽  
Concrete Interface

This paper presents an experimental study on the behavior of shear connectors embedded in steel-reinforced concrete joints. In steel-reinforced concrete joints, the shear connectors are commonly used to transfer longitudinal shear forces across the steel-concrete interface. Further, in Japan, some studies in recently have also been undertaken to apply perfobond rib shear connector (PBL), which is a type of shear connectors developed in civil engineering, to the steel-reinforced concrete joints in building structures. To clarify the influence of the arrangement methods of headed studs and PBLs to reinforced concrete member on the joints, T-shaped subassembrages were tested under the monotonic tensil loading.This experiment is constituted of the following; Exp. I: Bond strength across the steel-concrete interface. Exp. II: Arrangement methods of these shear connectors to reinforced concrete member. The following can be drawn from the test results 1) The experimental values of the average maximum and residual bond strength are 0.230-0.280 and 0.15-0.18 N/mm2, respectively. 2) When the distance of between the upper surface of the reinforced concrete member from the first layer for headed studs are small, the failure mode of the specimens is similar to a concrete-cone type failure. 3) In case that the total number of headed studs or the hole provided to PBL is the same, the maximum load of the specimen with the parallel arrangement is larger than that of when shear connecters are vertically arranged. 4) The shear strength of headed studs in the joints embedded the steel member in the reinforced concrete member is estimated by superposing the average residual bond strength across the steel-concrete interface. 

scholarly journals Experimental Study of Steel Reinforced Concrete (SRC) Joints

2019 ◽  
Vol 9 (8) ◽  
pp. 1528 ◽  
Author(s):  
Montava ◽  
Irles ◽  
Pomares ◽  
Gonzalez
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structures ◽  
Superposition Method ◽  
Reinforced Concrete Structures ◽  
Seismic Loads ◽  
Cyclic Loads ◽  
Large Displacements ◽  
Steel Reinforced Concrete ◽  
Steel Sections ◽  
Concrete Joints

This research analyzes the solution of reinforced concrete joints reinforced with steel sections, known as steel reinforced concrete (SRC). The aim is to verify the improvement of the ductile characteristics of steel reinforced concrete structures compared to conventional reinforced concrete structures. Another objective is to better understand the experimental behavior and thus be able to perform numerical simulations adjusted with the experimental ones. In addition, the behavior of reinforced concrete structures in all the bars with steel sections is compared with others in which only the joints are reinforced to obtain more efficient and economical structures. All these objectives have the main purpose of improving the behavior of structures against seismic loads. Five specimens of concrete joints with reinforced with steel were tested with cyclic loads to analyze their behavior. The strength superposition method can predict the shear strength. The results obtained confirm the greater capacity of absorption of energy of the structures with sections of steel embedded compared with the structures of conventional reinforced concrete, with greater ductility when facing large displacements.

Fire Performance of CFST, SRC and RC Frames

2011 ◽  
Vol 99-100 ◽  
pp. 300-303
Author(s):  
Guang Yong Wang ◽  
Xing Qiang Wang ◽  
Guang Wei Liu ◽  
Xiao Yang Liu ◽  
Da Fang Ma
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Failure Mechanism ◽  
Fire Resistance ◽  
Room Temperature ◽  
Steel Tube ◽  
Frame Structures ◽  
Fire Performance ◽  
Steel Reinforced Concrete ◽  
Rc Frames

Failure mechanism and fire resistance comparison of concrete-filled steel tube (CFST) frames, reinforced concrete (RC) frames and steel reinforced concrete (SRC) fames are proposed in this paper when their bearing capacity and rigidity at room temperature are similar. The result shows that the failure mode and failure mechanism of the 3 frame structures are much different, and the SRC frames have the maximum fire resistance.

Steel-reinforced concrete joints under reversal cyclic load

2003 ◽  
Vol 55 (6) ◽  
pp. 525-535 ◽  
Author(s):  
S. Swaddiwudhipong ◽  
D. Jiang ◽  
W. Cheng
Keyword(s):  
Reinforced Concrete ◽  
Cyclic Load ◽  
Steel Reinforced Concrete ◽  
Concrete Joints
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