scholarly journals Bending Performance of Prestressed Continuous Glulam Beams

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Nan Guo ◽  
Mingtao Wu ◽  
Ling Li ◽  
Guodong Li ◽  
Yan Zhao
Keyword(s):  
Bearing Capacity ◽  
Failure Modes ◽  
Joint Stiffness ◽  
Reinforcement Ratio ◽  
Bending Performance ◽  
Simply Supported ◽  
Prestressing Force ◽  
Continuous Beams ◽  
Steel Bars ◽  
The Impact

The limited transferring moment capability of Glulam (glued laminated wood) joints results in insufficient joint stiffness. Therefore, most of the connections are hinged joints. Based on the previous studies, one novel end-connection device was proposed to form prestressed continuous Glulam beams. The prestressed beams were composed of prestressed low-relaxation steel bars, the deviator block, the anchorage device, and the novel end-connection apparatus. These prestressed steel bars were tensioned by the deviator block to exert prestress. Then, 18 prestressed continuous beams and two prestressed simply supported beams were subject to the bending tests to explore the impact of reinforcement ratio and prestress on the prestressed Glulam beams from aspects such as failure modes, bearing capacity, load-deflection relationship, and load-strain relationship. The results show that, given the same prestress level, compared with beams with a reinforcement ratio of 1.92%, the bearing capacity of beams with a reinforcement ratio of 3.84% and 5.76% is increased by 20.3%–29.4% and 30.51%–36.36%, respectively. Given the same reinforcement ratios, compared with beams without prestressing, the bearing capacity of beams with a prestressing force of 7 kN and 14 kN is increased by 2.39%–10.14% and 6.49%–13.26%, respectively. In addition, compared with simply supported beams, the bearing capacity of continuous beams is increased by 40%, and the deformation is reduced by 13%. Therefore, as a novel prestressed beam, the bending performance of Glulam beams can be improved effectively.

scholarly journals Experimental Study on SSRC under Eccentric Compression

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Qingfu Li ◽  
Tianjing Zhang ◽  
Yaqian Yan ◽  
Qunhua Xiang
Keyword(s):  
Stainless Steel ◽  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Building Materials ◽  
Performance Test ◽  
Failure Modes ◽  
Mechanical Performance ◽  
Reinforcement Ratio ◽  
Eccentric Compression ◽  
Steel Bars

The use of stainless steel bars can improve the durability and sustainability of building materials. Through the static performance test, this research analyzes the failure pattern and bearing performance of bias stainless steel reinforced concrete (SSRC) column. The influence of reinforcement ratio of longitudinal bars and eccentricity on the mechanical performance of specimens was studied. Different constitutive models of stainless steel bars were used to calculate the ultimate bearing capacity of the section of the column under eccentric compression column. Based on the experimental results, a method to modify the expression of the design specification is proposed. And, the results were compared with the test results. The results showed that the damage patterns and failure modes of SSRC columns are essentially the same as those of traditional reinforced concrete columns. The bearing capacity of SSRC columns rises with the increase in the longitudinal reinforcement ratio, and the ductility of the specimens is enhanced. The ultimate load of the specimen decreases with the rise in eccentricity but the deflection increases gradually. The strain distribution of the mid-span section of the SSRC column conforms to the plane section assumption. The bearing capacity of the specimen can be analyzed by referring to the calculation method of the specification, and some parameters in the calculation formula of the specification are modified to adapt to the design and calculation of the SSRC column.

Experimental Study on Properties of Side Joint between Superimposed Slabs with Lattice Steel Bars

2014 ◽  
Vol 638-640 ◽  
pp. 109-114
Author(s):  
Xian Guo Ye ◽  
Kai Nan Yang ◽  
Xun Chong ◽  
Qing Jiang
Keyword(s):  
Bearing Capacity ◽  
Cross Section ◽  
Static Loading ◽  
Failure Modes ◽  
Service Condition ◽  
Shear Capacity ◽  
Test Results ◽  
Bending Performance ◽  
Remarkable Effect ◽  
Steel Bars

Mechanical properties of joint between superimposed slabs have a remarkable effect on the bending performance of the whole slab. To study the bending performance of superimposed slabs with different forms of joint, six superimposed slabs were designed and produced. Based on the static loading experiment, load was concentrated on two three-equal-division points, bearing capacity, deformation, cracks of specimens were obtained. Whether there were lattice steel bars in the precast slab or not and different reinforcement in the joint were considered to study the bending performance. The test results show that the failure mode of slab without lattice steel bars is brittle while others are ductile. Lattice steel bars can control the development of cracks along the superposed surface, increasing the shear capacity and improving the ductility of specimens. The bearing capacity of the whole superimposed slab depends on the joint cross section. The joint would not generate a difference to the deflection curves in service condition. When reinforcement in the joint is strengthened, failure modes of slabs will be effectively improved.

scholarly journals Flexural Behavior of Simply Supported Beams Consisting of Gradient Concrete and GFRP Bars

2021 ◽  
Vol 8 ◽  
Author(s):  
Jing Ji ◽  
Runbao Zhang ◽  
Chenyu Yu ◽  
Lingjie He ◽  
Hongguo Ren ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Constitutive Models ◽  
Reinforcement Ratio ◽  
Parameter Analysis ◽  
Flexural Behavior ◽  
Statistical Regression ◽  
Simply Supported ◽  
Gfrp Bars ◽  
Flexural Bearing Capacity ◽  
Gfrp Reinforcement

In order to study the flexural behavior of simply supported beams consisting of gradient concrete and GFRP bars, 28 simply supported beams were designed. The main parameters included the strength grades of high-strength concrete (HSC), GFRP reinforcement ratio, and sectional height of HSC. Based on nonlinear constitutive models of materials, meanwhile, considering the bond slip between concrete and GFRP bars, five simply supported beams with gradient concrete and five simply supported beams with GFRP bars were simulated, respectively. Then the mid-span load–displacement curves of beams were obtained. By comparing with the experimental data, the rationality of material constitutive models and finite element modeling was verified. Based on this, the parameter analysis of the beams with GFRP bars and gradient concrete was carried out, and the failure modes of the beams were obtained through investigation. The results show that the failure process of the beams can be divided into two stages: elastic stage and working stage with cracks. With the increase of GFRP reinforcement ratio, the flexural bearing capacity of the beams does not change significantly, while their stiffness increases gradually. The flexural bearing capacity of the beams can be significantly improved by appropriately increasing the strength and sectional height of HSC. The ultimate bearing capacity of the beams is 40% higher than that of the GFRP concrete beams. Finally, based on the plane-section assumption, the calculation formula of normal-section flexural bearing capacity of this kind of beams is proposed through statistical regression method.

Experimental Investigation on Steel H-Beam Prestressed with Externally High Strength Steel Bars

2014 ◽  
Vol 578-579 ◽  
pp. 155-159 ◽  
Author(s):  
Peng Cheng Zhu ◽  
Ming Kang Gou ◽  
Yin Zhi Zhou
Keyword(s):  
Experimental Investigation ◽  
Bearing Capacity ◽  
High Strength Steel ◽  
High Strength ◽  
Ultimate Bearing Capacity ◽  
Prestressing Force ◽  
Steel Bars ◽  
Post Tensioning ◽  
H Beam ◽  
Externally Prestressing

The external post-tensioning technique has been commonly used in the construction field because it facilitates the analysis of structures and is widely applicable for many types of structures. In this research, 12 steel H-beams were built and tested in terms of the amount of tendon or prestressing force. The results show that the externally prestressing method can increase ultimate bearing capacity of the beams. The prestressing force is the significant factor that influence the strengthening of steel H-beams. However, the amount of deviators cannot significantly influence the bearing capacity.

The Finite Element Analysis for Mechanical Properties of Reinforced FRP Pipe Concrete under Axial Compression - Discussing the Impact of Reinforcement Ratio, Concrete Strength

2013 ◽  
Vol 457-458 ◽  
pp. 1517-1522
Author(s):  
Wen Li ◽  
Hai Nan Yan ◽  
Peng Wang ◽  
Xiao Gang Chen ◽  
Li Na Yao
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Bearing Capacity ◽  
Axial Compression ◽  
Constitutive Relations ◽  
Concrete Strength ◽  
Ultimate Bearing Capacity ◽  
Reinforcement Ratio ◽  
Finite Element Software ◽  
The Impact

According to the basic idea of the finite element method, using the finite element software ANSYS to establish the finite element model of the reinforcement FRP pipe concrete under axial compression, introducing the unit selection in the process of building model ,based on the principle of meshing boundary conditions and constitutive relations selected; The significant degree of the model verified by compare with the test results. Analyzed by finite element reinforcement ratio, concrete strength and other factors on the mechanical properties of concrete under axial compression reinforcement FRP pipe, the analysis of the results shows: The increase of reinforcement ratio to improve the point load of the specimens and improve the composite column ultimate bearing capacity, but the reinforcement ratio increase will reduce the binding effect of the FRP pipe; The whole component be improved the strength of concrete can improve the ultimate bearing capacity, but it reduces the mechanical properties of the specimens.

scholarly journals Experimental study on damage evaluation of stainless steel–reinforced concrete piers under lateral impact

2020 ◽  
Vol 12 (5) ◽  
pp. 168781402092488
Author(s):  
Bo Wu ◽  
Shixiang Xu
Keyword(s):  
Stainless Steel ◽  
Reinforced Concrete ◽  
Impact Damage ◽  
Test System ◽  
Reinforcement Ratio ◽  
Test Results ◽  
Lateral Impact ◽  
Steel Reinforced Concrete ◽  
Steel Bars ◽  
The Impact

Horizontal impact tests of stainless steel–reinforced concrete piers with different reinforcement ratios at different impact velocities were carried out by using the ultra-high drop weight impact test system. Degree of piers damage after impact was comprehensively analyzed by measuring the acceleration of the impact body, the displacement of the top of the pier specimens, the strain of the steel bars, the rotation of the pier bottom, and the crack development of concrete. The test results showed that under the same impact velocity, with the decrease in reinforcement ratio, the peak acceleration of the impact body, the displacement of the top of pier specimens, the strain of steel bars, and the pier bottom rotation all increase. To a certain extent, increasing the reinforcement ratio of bridge piers can effectively reduce impact damage.

Experimental Study on Flexural Bearing Capacity of Reinforced Ceramsite Concrete Beam

2011 ◽  
Vol 366 ◽  
pp. 253-257
Author(s):  
Wei Jun Yang ◽  
Zheng Bo Pi ◽  
Zhen Lin Mo
Keyword(s):  
Bearing Capacity ◽  
Concrete Beam ◽  
Failure Modes ◽  
Concrete Beams ◽  
Cement Mortar ◽  
Reinforced Concrete Beams ◽  
Ordinary Concrete ◽  
Steel Bar ◽  
Steel Bars ◽  
Flexural Bearing Capacity

In order to investigate the flexural bearing capacity of reinforced ceramic concrete beams, static loading experiments were carried out. 10 ceramic reinforced concrete beams and 2 non-reinforced ceramic concrete with different steel ratios, cover thicknesses and bar diameters were fabricated. The gauges of concrete was arraged on the surfaces of section in mid-span and and steel gauges was arraged on the surfaces of steel bars. The loading device was consisted of a 200kN hydraulic jack, a distributive girder and reaction frame while the dial indicators was arraged in supports and mid-span. The strain of concrete and steel bar in different loading along with the crack,yield and utimate of load were recorded .It found that the stress-strain law, crack extension regularity , failure modes of specimens was similar to the ordinary concrete beams and the current procedures formulas about flexural bearing capacity is reliability. It also found that both ceramic aggregate and cement mortar were crushed for the perfectly bonding of the interface and the strength of aggregate was to be fully utilized.

Experimental Study on Strengthened Bridge Structures with Carbon Fiber Plate

2011 ◽  
Vol 284-286 ◽  
pp. 997-1000
Author(s):  
Lan Lin Zou ◽  
Xing Lin Zhou
Keyword(s):  
Experimental Study ◽  
Carbon Fiber ◽  
Bearing Capacity ◽  
Ultimate Bearing Capacity ◽  
Reinforcement Ratio ◽  
Shear Span ◽  
Anchor Length ◽  
Bridge Structures ◽  
The Impact ◽  
Fiber Plate

In order to analyze the impact of anchor length, ends anchorage measures, strength of concrete, shear-span ratio, reinforcement ratio and the amount of carbon fiber plate on the bearing capacity of strengthened bridge structures with carbon fiber plate, 11 pieces of rectangle beams are fabricated for flexural experimental study. The experimental results show that the ultimate bearing capacity of the specimens increase different degree as different strengthened schemes: the bearing capacity of rectangle beams with plate end anchorage has increased remarkably; The beams have greater bearing capacity with more anchorage length in contrast to those without any anchorage measure; The ultimate bearing capacity enhanced more prominent for those specimens with low shear-span ratio and low reinforcement ratio.

Load Bearing Capacity of Super-Carburized Gears

2003 ◽  
Author(s):  
Takao Koide ◽  
Koji Tsubokura ◽  
Satoshi Oda ◽  
Chiaki Namba
Keyword(s):  
Bearing Capacity ◽  
Failure Modes ◽  
Contact Fatigue ◽  
Case Depth ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Bending Fatigue ◽  
Surface Durability ◽  
Carburized Gear ◽  
The Impact

This paper describes a study on the load bearing capacity of super-carburized gears. Test gears and rollers of MAC14 and SCM415 steels were super or eutectoid-carburized under different carburizing conditions. The impact and bending fatigue tests for test gears and the contact fatigue test for test rollers were carried out. The effects of case depths on the impact and bending fatigue strengths of gears and the surface durability of rollers were determined. The impact breaking limit energy of super-carburized gears was found to be larger by about 15% than that of eutectoid-carburized gears irrespective of case depth. The bending fatigue strength of the super-carburized gear was found to be almost equal to that of the eutectoid-carburized gear. The surface durability of the super-carburized roller becomes larger with an increase of case depth and is larger than that of eutectoid-carburized rollers in the case of larger case depth. The surface failure modes for super and eutectoid-carburized rollers were spalling. The load bearing capacity of super and eutectoid-carburized gears was found to become larger by shot-peening.

scholarly journals Performance of High-Strength Concrete One-Way Slabs with Embedded BFRP Bar Reinforcement

2018 ◽  
Vol 1 (1) ◽  
pp. p25
Author(s):  
Qasim M. Shakir
Keyword(s):  
Reinforced Concrete ◽  
Load Capacity ◽  
High Strength ◽  
Continuity Condition ◽  
Reinforcement Ratio ◽  
Simply Supported ◽  
Frp Composites ◽  
Steel Bars ◽  
Element Approach ◽  
Monotonic Loads

Since the invention of reinforced concrete, steel bars had been used as tension device to resist tensile stresses.   Recently, several experimental and theoretical studies have been achieved to verify that FRP composites bars (CFRP and GFRP) may be a good competitive alternatives due to strength ,durability and weight aspects. Few studies have been published about the performance of BFRP bars in reinforced concrete simply supported or continuous slabs. Thus, In the present work, a theoretical study based of the finite element approach is achieved utilizing ANSYS-15 package to investigate the performance of the reinforced concrete one-way slabs with embedded basalt (BFRP) bars under monotonic loads. Six slabs have been considered, two were simply supported and four were continuous each with two-span. Several parameter have been studied such as continuity condition, reinforcement ratio, position of reinforcement and the effect of replacement basalt bars by steel bars. It is concluded that slabs reinforced with BFRP bars have lower performance if compared with that reinforced with steel bar reinforcement. Also, it is found that the steel is more effective in bottom face within the midspan zone and basalt bars are inactive in top compression zone. It is found with an efficient distribution of bars that for slab with reinforcement ratio of 0.7%, the load capacity is improved by 12.5% and a reduction in max. deflection 46%. while the load capacity is improved by 61% when adopting a ratio of 1% while the max. deflection is reduced by 56%.

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