scholarly journals Experimental study on precast beam-column connections with continuity reinforcement for negative bending moments

2020 ◽  
Vol 13 (2) ◽  
pp. 314-347
Author(s):  
G. M. S. ALVA ◽  
M. M. S. LACERDA ◽  
T. J. SILVA
Keyword(s):  
Experimental Study ◽  
Experimental Investigation ◽  
Concrete Beams ◽  
Precast Concrete ◽  
Concrete Column ◽  
Flexural Stiffness ◽  
Bending Moments ◽  
Strength Capacity ◽  
Secant Stiffness ◽  
Negative Bending

Abstract In this paper, an experimental investigation is presented on semi-rigid interior beam-to-column connections constituted by precast concrete beams supported on precast concrete column corbels and bending continuity reinforcement bars for bending negative moments. The main purpose of this paper was to analyze the influence of vertical interface grout filling between the corbel and the beam and the position of the bending continuity reinforcement bars (crossing only the column or crossing only the slab) on the behavior of this type of connection. Tests on eight specimens were performed. It was noticed that the vertical interface grout filling contributed to increase both rotational flexural stiffness and flexural strength capacity of the connections when compared to the connections without grout filling. It was also noticed that in the specimens in which the continuity bars crossed only the column, the rotational flexural stiffness was higher. For these last ones, coefficients k and β for predicting the secant stiffness by simplified expression present in Brazilian Code NBR 9062 were evaluate from experimental results. These evaluated coefficients may be regarded as indicative values for structural designers and helpful for future researches.

Experimental Study on Flexural Performances of Concrete Beams Strengthened with Near-Surface Mounted (NSM) FRP Reinforcement

2010 ◽  
Vol 163-167 ◽  
pp. 3634-3639
Author(s):  
Li Li Sui ◽  
Tie Jun Liu ◽  
Feng Xing ◽  
Yu Xiang Fu
Keyword(s):  
Experimental Study ◽  
Concrete Beam ◽  
Concrete Beams ◽  
Flexural Stiffness ◽  
Test Results ◽  
Near Surface ◽  
Bending Performance ◽  
Bending Capacity ◽  
Frp Reinforcement ◽  
Near Surface Mounted

This paper illustrates the results of an experimental study on the bending performance of concrete beams strengthened with near-surface mounted (NSM) FRP reinforcement. The critical parameter of the embedded length of NSM-FRP plates was investigated in particularly. The test results indicated that NSM-FRP reinforcement can significantly improve the strength and crack resistance capacity of the concrete beam, reducing the size of cracks. The embedded length of the NSM-FRP plate has distinct influence on the cracking and bending capacity, the flexural stiffness, and the crack developments of the concrete beam. As the embedded length increased, the bending capacity and the flexural stiffness increased correspondingly and the crack developed more intensively.

scholarly journals EXPERIMENTAL STUDY ON BOND STRENGTH BETWEEN CERAMIC TILE AND PRECAST CONCRETE COLUMN USING 150MPa CONCRETE(Materials and Construction)

2006 ◽  
Vol 12 (24) ◽  
pp. 15-20
Author(s):  
Hiroshi KUBOTA ◽  
Hiroshi JINNAI ◽  
Shusuke KUROIWA ◽  
Satoshi WATANABE ◽  
Rieko TERAUCHI ◽  
...  
Keyword(s):  
Experimental Study ◽  
Bond Strength ◽  
Ceramic Tile ◽  
Precast Concrete ◽  
Concrete Column ◽  
Concrete Materials

scholarly journals Contribution to assessing the stiffness reduction of structural elements in the global stability analysis of precast concrete multi-storey buildings

2012 ◽  
Vol 5 (3) ◽  
pp. 316-342 ◽  
Author(s):  
M. C. Marin ◽  
M. K. El Debs
Keyword(s):  
Global Stability ◽  
Structural Model ◽  
Precast Concrete ◽  
Bending Moments ◽  
Structural Elements ◽  
Technical Literature ◽  
Stiffness Reduction ◽  
Reduction Coefficient ◽  
Negative Bending ◽  
Raphson Method

This study deals with the reduction of the stiffness in precast concrete structural elements of multi-storey buildings to analyze global stability. Having reviewed the technical literature, this paper present indications of stiffness reduction in different codes, standards, and recommendations and compare these to the values found in the present study. The structural model analyzed in this study was constructed with finite elements using ANSYS® software. Physical Non-Linearity (PNL) was considered in relation to the diagrams M x N x 1/r, and Geometric Non-Linearity (GNL) was calculated following the Newton-Raphson method. Using a typical precast concrete structure with multiple floors and a semi-rigid beam-to-column connection, expressions for a stiffness reduction coefficient are presented. The main conclusions of the study are as follows: the reduction coefficients obtained from the diagram M x N x 1/r differ from standards that use a simplified consideration of PNL; the stiffness reduction coefficient for columns in the arrangements analyzed were approximately 0.5 to 0.6; and the variation of values found for stiffness reduction coefficient in concrete beams, which were subjected to the effects of creep with linear coefficients from 0 to 3, ranged from 0.45 to 0.2 for positive bending moments and 0.3 to 0.2 for negative bending moments.

Analysis on Flexural Stiffness of GFRP-concrete Hybrid Beams

2017 ◽  
Vol 11 (1) ◽  
pp. 940-945
Author(s):  
Fei Zhao ◽  
Chaohe Chen ◽  
Haihao Guo
Keyword(s):  
Experimental Study ◽  
Reinforced Concrete ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Flexural Stiffness ◽  
Rc Beam ◽  
Short Term ◽  
Change Characteristics ◽  
Hybrid Beams ◽  
The Moment

Background: Deferent types of reinforced concrete beams wrapped with GFRP pultruded profiles and a control RC beam are tested under three points loading. Objective: The moment-curvature curves of all tested beams are obtained based on the experimental study. The change characteristics of flexural stiffness for tested beams are analyzed, and the short-term flexural stiffness formula is derived. Results: Finally the computed values of midspan deflection for tested beams are achieved.

scholarly journals Experimental study of RC beams strengthened for bending by reinforced grout layer and connectors

2018 ◽  
Vol 11 (4) ◽  
pp. 810-833
Author(s):  
J. H. CANAVAL ◽  
T. J. DA SILVA ◽  
A. C. SANTOS
Keyword(s):  
Experimental Study ◽  
Experimental Investigation ◽  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Concrete Beams ◽  
Point Load ◽  
Reinforced Concrete Beams ◽  
Bending Test ◽  
Experimental Program ◽  
Rc Beams

Abstract This work is based on an experimental investigation of reinforced concrete beams strengthened to flexure for wrapping applying a type of metallic connector in the bond substrate/groute. The experimental program consisted of 5 beams used for reference (without strengthening), 5 beams reinforced with surface brushed texture substrate and 5 beams with metal connectors bonded to the substrate. The beams were submitted to four-point load bending test. Initially with a partial loading, executed the strengthening and were finally tested until the break. The strengthening was made up by the increase by graute, on the sides and bottom of the beam and reinforcing. The applied force, the displacement, deformations in steel and in concrete were measured. The reference beams failure by flexing with the calculated charges. The bending strengthening proved efficient, increasing the bearing capacity in 44% and the failure was by shear in the stretch without strengthening. Beams with connectors the increase was higher.

Performance of Precast Concrete Moment Frames Subjected to Column Removal: Part 1, Experimental Study

PCI Journal ◽  
2017 ◽  
Vol 62 (5) ◽  
Author(s):  
H. S. Lew ◽  
Joseph A. Main ◽  
Yihai Bao ◽  
Fahim Sadek ◽  
Vincent P. Chiarito ◽  
...  
Keyword(s):  
Experimental Study ◽  
Precast Concrete ◽  
Moment Frames ◽  
Column Removal
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