scholarly journals Effective Structural System for the Affordable Housing Construction

2018 ◽  
Vol 7 (3.2) ◽  
pp. 291
Author(s):  
Andrii Pavlikov ◽  
Serhii Mykytenko ◽  
Anton Hasenko
Keyword(s):  
Reinforced Concrete ◽  
Flat Plate ◽  
Affordable Housing ◽  
Theoretical Data ◽  
Theoretical Method ◽  
Housing Construction ◽  
Structural System ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Frame Construction

This article falls within vital question in quickly builds construction – theoretical method for calculating the slabs and columns of such buildings. Calculation research of buildings with reinforced concrete frame slabs is described in the article. The features of work the collapsible flat plate ceiling in composition of reinforced concrete framework of building are analyzed. Problems in the design of framework building are considered in order to increase its reliability. The suggestions for directions of perfection the calculation of flat plate frame construction elements are proposed in the article. The novelty of this work is to get new theoretical data about bearing capacity and deformability of structural system for the affordable housing construction from reinforced concrete.  

The effect of the ratio of Λ-shaped shear connectors on the flexural behavior of a reinforced concrete frame

2020 ◽  
Vol 23 (12) ◽  
pp. 2724-2740
Author(s):  
Quy Thue Nguyen ◽  
Ramazan Livaoğlu
Keyword(s):  
Reinforced Concrete ◽  
Cross Section ◽  
Nonlinear Behavior ◽  
Flexural Behavior ◽  
Seismic Action ◽  
Structural System ◽  
Reinforced Concrete Frame ◽  
Shear Connectors ◽  
Concrete Frame ◽  
Bending Capacity

Failure in a structural system can appear because of different types of pathologies and can cause a large number of problems during seismic action. Among these pathologies are design and execution flaws, underestimation of the required capacity of cross-section or seismic demand, and use of low quality of materials. The jacketing technique for a frame element is the most common use strengthening method in the practice to remove such disadvantages in a structural system. Then, the shear stress transferability at the concrete-to-concrete interface surface is the main objective. Shear connectors application is a solution for that consideration, but the investigation in the literature focusing this point is not adequate. The effect of the ratio of steel shear connectors on the interfaces of a reinforced concrete frame constructed using reinforced concrete formworks on its flexural behavior is numerically evaluated. Initially, the same ratio of Π-shaped and Λ-shaped shear connectors, 0.312%, is applied to determine the more effective shape. It should be clear that the ratio of shear connectors on any separate surface is calculated as the fraction of the total area of the cross-section of shear connectors placed perpendicularly (Π-shaped) at the surface and the area of that surface. The same ratio is understood as after evaluating the Π-shaped shear links, each of them is replaced by a Λ-shaped link at the same location. As a result, compared to the bending capacity of the frame whose surfaces are smooth, Λ-shaped connectors enhance the bending capacity of the frame up to 9.67% while the amount of improvement brought by Π-shaped ones is modest, about 2.172%. After that, a wide variety of the ratio of Λ-shaped connectors, 9 values, are placed on concrete-to-concrete interfaces. Tremendously, due to clamping stress brought by Λ-shaped shear connectors at the concrete substrates, the nonlinear behavior is improved and the amount of enhancement rises as the number of applied connectors is augmented but not linearly. The most important observation is that the amount of improvement is insignificant after the ratio of shear connectors reaches the percentage of between 0.3% and 0.4%. On the other hand, compared with the frame whose interfaces are smooth, the displacement ductility factor of the frame strengthened using 0.4% decreases an amount of about 30%.

EXPERIMENTAL STUDIES OF A FRAGMENT OF A REINFORCED CONCRETE FRAME OF A MULTI-STOREY BUILDING UNDER COMPLEX STRESS STATE

2021 ◽  
Vol 97 (5) ◽  
pp. 62-73
Author(s):  
O.E. OSOVSKIKH ◽  
Keyword(s):  
Reinforced Concrete ◽  
Equations Of Motion ◽  
Experimental Studies ◽  
Complex Stress ◽  
Complex Stress State ◽  
Structural System ◽  
Reinforced Concrete Frame ◽  
Limit States ◽  
Concrete Frame ◽  
Storey Building

The article presents the results of experimental research and computational analysis of a reinforced concrete spatial frame - a fragment of the frame of a multi-storey building in limiting and out-of-limit states. A series of tests for design and beyond design impacts was performed at the stage of construction without cracks. The dynamic calculation of the considered structural system was carried out in the mode of direct integration of the equations of motion. The features of frame deformation before and after the beyond design basis impact, causing a sudden structural restructuring of the structural system, have been established. Satisfactory agreement of the calculation results with the test results is obtained.

scholarly journals Post-elastic seismic response of a reinforced concrete frame

1968 ◽  
Vol 1 (2) ◽  
pp. 102-112
Author(s):  
W. R. Walpole ◽  
R. Shepherd
Keyword(s):  
Reinforced Concrete ◽  
Seismic Response ◽  
Seismic Design ◽  
Structural System ◽  
Reinforced Concrete Frame ◽  
Two Phase ◽  
Concrete Frame

The two-phase philosophy of structural seismic design involves the choice of a structural system which will remain elastic under small or medium earthquakes and which will deform inelastically, but not catastrophically, in a major seismic disturbance.

scholarly journals Determination of dynamic durabilities and dynamic strength of armature in the elements of the constructive system at its flash structural restructuring

2018 ◽  
Vol 251 ◽  
pp. 02009
Author(s):  
Nataliya Fedorova
Keyword(s):  
Reinforced Concrete ◽  
Dynamic Strength ◽  
Structural System ◽  
Reinforced Concrete Frame ◽  
Structural Reorganization ◽  
Concrete Frame ◽  
Half Wave ◽  
Rod System ◽  
Emergency Actions

The results of modeling and computational analysis of the static-dynamic deformation of the reinforced concrete frame-and-rod system are presented for special emergency actions caused by the sudden removal of one of the supporting elements. On the basis of energy, without the apparatus of the dynamics of structures, analytical dependences are constructed to determine the increments of the dynamic extensions in the stretched armature and the dynamic strength of the reinforcement in the sections of the frame elements under the indicated effects on the first half-wave of the structure's oscillations. Verification of the proposed analytical dependencies is performed by comparing the theoretical values of the calculated parameters with the experimental data. It is shown that the constructed analytical dependencies allow to determine quite strictly the investigated dynamic parameters of deformation of the loaded reinforced concrete framed structural systems of buildings and structures under their dynamic overloading by special emergency action associated with sudden structural reorganization of the structural system.

Experimental Study on Hybrid Masonry Structure with RC Frame under Lateral Reversed Cyclic Loading

2018 ◽  
Author(s):  
Fei Zhang ◽  
Jianxun Ma
Keyword(s):  
Experimental Study ◽  
Reinforced Concrete ◽  
Cyclic Loading ◽  
Masonry Structure ◽  
Rc Frame ◽  
Structural System ◽  
Reinforced Concrete Frame ◽  
Displacement Ductility ◽  
Concrete Frame ◽  
Reversed Cyclic

<p>As a new type of structural system, hybrid masonry (HM) structure with reinforced concrete (RC) frame is constructed of reinforced block masonry wall and reinforced concrete frame. This structural system combines the advantages of reinforced concrete frame structure and reinforced concrete block masonry structure, also overcomes some limitations of them. In order to study the seismic performance of the structural system, the lateral reversed cyclic loading experiment on the HM structure with RC frame was conducted. In the experiment, two specimens that were constructed with different connecting type were designed and tested, in one of them the masonry blocks was separated from the RC frame and only connected with steel keys at the top part of the specimen, while in the other there was no spacing between the RC frame and the masonry blocks. According to the data of the experiment, the paper analyzed the failure process and patterns, hysteretic characteristic, skeleton curve, stiffness degradation and displacement ductility of the structural system, and compared the results of the two specimens. The experimental study indicated that the HM structure with RC frame showed extraordinary good seismic performance during testing, and this form of construction had fairly good displacement ductility and energy dissipation, which would provide a basis for further theoretical analysis and design method.</p>

scholarly journals Shear Behavior of a Reinforced Concrete Frame Retrofitted with a Hinged Steel Damping System

2020 ◽  
Vol 12 (24) ◽  
pp. 10360
Author(s):  
Hyun-Do Yun ◽  
Sun-Woong Kim ◽  
Wan-Shin Park ◽  
Sun-Woo Kim
Keyword(s):  
Reinforced Concrete ◽  
Shear Behavior ◽  
Seismic Retrofitting ◽  
Reinforced Concrete Frame ◽  
Main Research ◽  
Torsion Spring ◽  
Concrete Frame ◽  
Energy Dissipation Capacity ◽  
Research Questions ◽  
Torsion Springs

The purpose of this study was to experimentally evaluate the effect of a hinged steel damping system on the shear behavior of a nonductile reinforced concrete frame with an opening. For the experimental test, a total of three full-scale reinforced concrete frame specimens were planned, based on the “no retrofitting” (NR) specimens with non-seismic details. The main research questions were whether the hinged steel damping system is reinforced and whether torsion springs are installed in the hinged steel damping system. From the results of the experiment, the hinged steel damping system (DR specimen) was found to be effective in seismic retrofitting, while isolating the opening of the reinforced concrete (RC) frame, and the torsion spring installed at the hinged connection (DSR specimen) was evaluated to be effective in controlling the amount of deformation of the upper and lower dampers. The strength, stiffness, and energy dissipation capacity of the DSR specimen were slightly improved compared to the DR specimen, and it was confirmed that stress redistribution was induced by the rotational stiffness of the torsion spring installed in the hinge connection between the upper and lower frames.

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