Effects of elastic supports and flexural cracking on low and high order modal properties of a reinforced concrete girder

2019 ◽  
Vol 178 ◽  
pp. 573-585 ◽  
Author(s):  
Ali Hafiz ◽  
Thomas Schumacher
Keyword(s):  
Reinforced Concrete ◽  
High Order ◽  
Elastic Supports ◽  
Modal Properties ◽  
Concrete Girder

Experimental Study on Specimens of Steel Secondary Beam Embedded in Reinforced Concrete Girder of Frame Structure

2011 ◽  
Vol 243-249 ◽  
pp. 1072-1084 ◽  
Author(s):  
Qiong Yu ◽  
Zhou Dao Lu ◽  
Jiang Tao Yu ◽  
Xing Zhuang Zhao ◽  
Jin Dai
Keyword(s):  
Reinforced Concrete ◽  
Cantilever Beam ◽  
Concrete Beam ◽  
Concrete Slab ◽  
Frame Structure ◽  
Secondary Beam ◽  
Steel Beam ◽  
Rotational Angle ◽  
Pullout Failure ◽  
Concrete Girder

Test of two specimens (four different joints) of steel secondary beam embedded in reinforced concrete girder in frame structure and one specimen with steel cantilever beam embedded in reinforced concrete girder under static load were conducted. The steel beam up-flange was pulled out because of the concrete cracks caused by the moment, shear and torsion at the upper zone of the concrete beam near the steel beam end. Shear failure of the concrete beam and the top flange pullout failure are the most hazardous failure modes. Lacking restraint of concrete and the reinforcement of steel bar in the concrete slab and catenary action of restraint steel beam, the capacity of steel cantilever beam is much smaller than other beams. Load-slip curve of top flange of steel beam, load-rotation curve of the steel beam end are obtained through experiment. Primary calculation method of joints flexural capacity related to section size of composite steel beam, embedded depth of steel beam, flange width of steel beam embedded end, height of frame girder, is put up with. Analytical results of ABAQUS are shown as follows. Top flange pullout failure of steel beam is caused by the detachment of concrete and steel beam end, and the warp of the concrete slab near the support plays an unfavorable action on the performance of the steel beam. The end rotational angle of the steel beam with anchor bar is smaller than that without. The steel beam with shear connectors develops a smaller rotational angle and a higher load capacity.

In-Plane Force Effect of Reinforced Concrete Beam with Elastic Supports

2011 ◽  
Vol 287-290 ◽  
pp. 1896-1901
Author(s):  
Zhi Kun Guo ◽  
Wan Xiang Chen ◽  
Qi Fan Wang ◽  
Yu Huang ◽  
Chao Pu Li ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Beams ◽  
Nonlinear Characteristics ◽  
Elastic Supports ◽  
Calculation Results ◽  
Basic Equations ◽  
First Time ◽  
Good Agreement

The bearing capacities of one-way reinforced concrete beams with elastic supports are investigated in this paper. According to the nonlinear characteristics of the beams, the basic equations based on plastic theory of concrete are derived by considering the in-plane force effects that aroused by the constraints of supports when the beams deforming. It is indicated that the calculation results are in good agreement with experimental datum, and the influences of different supports on the bearing capacities of the beams are quantitatively given for the first time.

Hybrid simulation of a carbon fibre–reinforced polymer-strengthened continuous reinforced concrete girder bridge

2017 ◽  
Vol 20 (11) ◽  
pp. 1658-1670 ◽  
Author(s):  
Shizhu Tian ◽  
Hongxing Jia ◽  
Yuanzheng Lin
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fibre ◽  
Hybrid Simulation ◽  
Simulation System ◽  
Reinforced Polymer ◽  
Carbon Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Girder Bridge ◽  
Concrete Girder ◽  
Hybrid Simulations

The behaviour of bridge columns strengthened using carbon fibre–reinforced polymer composites has been studied extensively. However, few investigations have been conducted regarding the influence of carbon fibre–reinforced polymer-strengthened columns on the seismic behaviour of reinforced concrete continuous girder bridges. This article details the hybrid simulations of a continuous reinforced concrete girder bridge whose columns are strengthened by carbon fibre–reinforced polymer jackets. In the hybrid simulations, one ductile column is selected as the experimental element, which is represented by a 1/2.5-scale specimen, and the remaining bridge parts are simultaneously modelled in OpenSees (the Open System for Earthquake Engineering Simulation). After combining the experimental element and the numerical substructure, the hybrid analysis model is developed with the established hybrid simulation system. The displacements of the bridge and the lateral force–displacement response of the experimental element in hybrid simulation are obtained. Compared with the results of numerical simulation, the stability and accuracy of the established hybrid simulation system are demonstrated. Meanwhile, the comparative hybrid simulation results of the as-built bridge and the carbon fibre–reinforced polymer-strengthened bridge also prove the effectiveness of the carbon fibre–reinforced polymer jackets’ confinement in the continuous reinforced concrete girder bridge.

Determination of stresses and dynamic coefficients when testing railway overpasses

2021 ◽  
Vol 2 (80) ◽  
pp. 229-237
Author(s):  
M.Ya. Kvashnin ◽  
◽  
I.S. Bondar ◽  
S.S. Khasenov ◽  
G.S. Bikhozhaeva ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Dynamic Coefficients ◽  
The Republic ◽  
Concrete Girder

This paper presents some results of instrumental measurements of dynamic coefficients and fiber stresses of reinforced concrete girder spans of railway overpasses under mobile load. The results obtained can be used for further monitoring of similar structures on the main railway lines of the Republic of Kazakhstan, to identify damage in the structures of bridges.

scholarly journals Tests of reinforced concrete flight structure of the bridge through the r.Suhoy Torec in Barvenkovo

2020 ◽  
pp. 104-111
Author(s):  
Valerii Shmukler ◽  
Roman Kaplin ◽  
Yurii Krul
Keyword(s):  
Reinforced Concrete ◽  
Potential Energy ◽  
Rational Design ◽  
Direct Method ◽  
Deformation Energy ◽  
Forced Oscillations ◽  
Actual Distribution ◽  
Complete Replacement ◽  
Constant Pitch ◽  
Concrete Girder

The article considers the overhaul of the reinforced concrete bridge in Barvinkove with the complete replacement of the girder structures. Beam structures were installed on existing supports, the distance between the axes of which is 14.06 m (non-standard beam). Thus, new beams must be performed on a special (individual) project. Equally important is the issue of reducing the weight of the structure, which will have a positive effect on existing foundations, reducing the pressure on the ground and, if possible, unloading the foundation of the structure. As a new girder structure, an effective construction of a reinforced concrete girder structure is presented, using perforated metal elements of box section and an effective reinforced concrete slab of the carriageway. When designing metal blocks, a direct method of forming the parameters of the structure based on energy principles was used, namely: minimization of potential deformation energy and density distribution of potential deformation energy. The parameters of the holes in the perforated elements at a constant pitch and the angles of inclination of the inclined lines of the beams were taken as parameters. Thus, a rational design of the blocks was obtained, which corresponded to the lowest value of potential energy, which, in turn, corresponds to the lowest material consumption, and a more uniform distribution of potential energy density with decreasing stress concentration in the corners of the holes. Upon completion of all works, scientific and acceptance tests of the building were carried out. The test program provides for static and dynamic tests of the bridge. The aim of the study was to assess the stress-strain state metal block of reinforced concrete girder structure. During the test, the deflections of the structure were obtained, the actual distribution of deformations and stresses was revealed, the frequencies, periods and amplitudes of the natural and forced oscillations of the structure were obtained. A theoretical model of the girder structure was built, on the basis of which the VAT components were obtained and compared with the results obtained during the test.

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