EXPERIMENT ON SHEAR OF POST-TENSIONED CONNECTION BETWEEN CONCRETE AND CAST IRON PLATE HAVING SHEAR-KEY

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Kiyoka Kinoshita ◽  
Yusuke Maida ◽  
Hiroyasu Sakata ◽  
Kazushi Shimazaki ◽  
Eiichiro Saeki ◽  
...  
Keyword(s):  
Cast Iron ◽  
Tensile Force ◽  
Frictional Resistance ◽  
Rc Beam ◽  
Iron Plate ◽  
Friction Resistance ◽  
Shear Key ◽  
Post Tensioned

In this paper, post-tensioned connection between concrete and cast iron plate having shear-key was adopted. Frictional resistance acts when there is no displacement between concrete and cast iron plate, shear-key also act to transmit stress to RC beam at the same time as the frictional resistance when the displacement occurs. Each specimen consists of RC beam and plate simulating post-tensioned connection. Ten specimens were tested. The parameter are type of plate, with or without the shear-key, the height of the shear-key, amount of the shear-key, difference between the post-tensioned force and whether or not applying vertical tensile force. In conclusion, it was needless to think their displacement by post-tensioned connection. And the strength of specimens with shear-key is presented by the sum of friction resistance and bearing resistance by using anamnestic formula.

scholarly journals SHEAR STRENGTH EVALUATION OF POST-TENSIONED CONNECTION BETWEEN DUCTILE CAST IRON PLATE WITH SHEAR-KEY AND CONCRETE

2017 ◽  
Vol 82 (739) ◽  
pp. 1425-1435 ◽  
Author(s):  
Yusuke MAIDA ◽  
Kiyoka KINOSHITA ◽  
Hiroyasu SAKATA ◽  
Kazushi SHIMAZAKI ◽  
Nobuyuki IZUMI ◽  
...  
Keyword(s):  
Shear Strength ◽  
Cast Iron ◽  
Ductile Cast Iron ◽  
Strength Evaluation ◽  
Iron Plate ◽  
Shear Key ◽  
Post Tensioned

scholarly journals PENGARUH DIAMETER TIANG TERHADAP TAHANAN GESEK TIANG DALAM TANAH LEMPUNG

2019 ◽  
Vol 1 (3) ◽  
pp. 219-224
Author(s):  
Andikanoza Pradiptiya ◽  
A’isyah Salimah
Keyword(s):  
Pile Foundation ◽  
Structural Damage ◽  
Tensile Load ◽  
Frictional Resistance ◽  
Test Method ◽  
Scale Model ◽  
Friction Resistance ◽  
Average Value ◽  
Constant Rate ◽  
Pile Model

AbstractSome buildings impose limits on the foundation displacement that occur with relatively small values so as not to cause structural damage. The test method used was to make a model test box as a testing medium by simulating the actual model into the form of a scale model. The study was conducted using a single pile foundation with reduced scale, made of concrete with a diameter of 0.02 m, 0.03 m, 0.04 m and the length of each pile was 0.4 m. The pile model was mounted by pressing into the clay that had been compacted in the test box and then given a tensile load which refers to ASTM D3689-07 procedure E (Constant Rate of Uplift Test). Mobilization of pile friction resistance at critical displacement determined the frictional resistance of the ultimate pile units. The test results showed that the greater the diameter of the pile, the frictional resistance of the ultimate pile units would increase. The increase in frictional resistance of the ultimate pile units showed an average value of around 17.1%.Keywords : Pile foundation, Pile diameter, Friction resistance.AbstrakMeningkatnya pembangunan hunian mengakibatkan naiknya permintaan akan batako, hal ini tentunya Beberapa konstruksi bangunan memberikan batasan kepada perpindahan tiang yang terjadi dengan nilai yang relatif kecil supaya tidak menyebabkan kerusakan struktur. Metode uji yang dipakai adalah membuat box uji model sebagai media pengujian, dengan mensimulasikan model yang sebenarnya ke dalam bentuk model skala. Penelitian dilakukan menggunakan model pondasi tiang tunggal penampang lingkaran lingkaran skala tereduksi yang terbuat dari beton dengan diameter 0,02 m, 0,03 m, 0,04 m dan panjang  masing-masing tiang adalah 0,4 m. Model tiang dipasang dengan cara ditekan pada tanah lempung yang sudah dipadatkan dalam box uji kemudian diberikan beban tarik yang mengacu pada ASTM D3689-07 prosedur E (Constant Rate of Uplift Test). Mobilisasi tahanan gesek tiang pada perpindahan tiang kritis menetukan tahanan gesek satuan ultimit. Hasil uji memperlihatkan bahwa semakin besar diameter tiang, tahanan gesek satuan ultimit tiang akan bertambah. Peningkatan tahanan gesek satuan ultimit tiang menunjukkan rata-rata sekitar 17,1 %.Kata kunci : Pondasi Tiang, Diameter Tiang, Tahanan Gesek Tiang.

A Modified Chezy Formula for One-Dimensional Unsteady Frictional Resistance in Open Channel Flow

2021 ◽  
Vol 143 (5) ◽  
Author(s):  
Junwei Zhou ◽  
Weimin Bao ◽  
Geoffrey R. Tick ◽  
Hamed Moftakhari ◽  
Yu Li ◽  
...  
Keyword(s):  
Unsteady Flow ◽  
Frictional Resistance ◽  
Mitigation Strategies ◽  
Flood Routing ◽  
Flood Events ◽  
Complex Flow ◽  
Cross Sectional ◽  
Friction Resistance ◽  
Flow Unsteadiness ◽  
Better Than

Abstract It has been observed in literature that for unsteady flow conditions the one-to-one relationships between flow depth, cross-sectional averaged velocity, and frictional resistance as determined from steady uniform flow cases may not be appropriate for these more complex flow systems. Thus, a general friction resistance formula needs to be modified through the addition of new descriptive terms to account for flow unsteadiness, in order to eliminate errors due to uniform and steady-flow assumptions. An extended Chezy formula incorporating both time and space partial derivatives of hydraulic parameters was developed using dimensional analysis to investigate the relationship between flow unsteadiness and friction resistance. Results show that the proposed formula performs better than the traditional Chezy formula for simulating real hydrograph cases whereby both formula coefficients are individually identified for each flood event and coefficients are predetermined using other flood events as calibration cases. Although the extended Chezy formula as well as the original Chezy formula perform worse with the increasing degree of flow unsteadiness, its results are less dramatically affected by unsteadiness intensity, thereby improving estimations of flood routing. As a result, it tends to perform much better than traditional Chezy formula for severe flood events. Under more complex conditions whereby peak flooding events may occur predominantly under unsteady flow, the extended Chezy model may provide as a valuable tool for researchers, practitioners, and water managers for assessing and predicting impacts for flooding and for the development of more appropriate mitigation strategies and more accurate risk assessments.

Forming of Brittle Nodular Cast Iron Plate by Laser Thermal Stress

2008 ◽  
Vol 35 (6) ◽  
pp. 937-942
Author(s):  
周益军 Zhou Yijun ◽  
张永康 Zhang Yongkang ◽  
游文明 You Wenming ◽  
尹晨 Yin Chen
Keyword(s):  
Cast Iron ◽  
Thermal Stress ◽  
Nodular Cast Iron ◽  
Iron Plate

scholarly journals Analysis of trimaran-pentamaran side hull location based on clearance and staggers with stern form variations

2018 ◽  
Vol 67 ◽  
pp. 04003
Author(s):  
Yanuar ◽  
Wiwin Sulistyawati ◽  
R. Joshua Yones ◽  
Samodero Mahardika
Keyword(s):  
Surface Area ◽  
Optimum Design ◽  
High Speed ◽  
Frictional Resistance ◽  
Experimental Tests ◽  
Hull Form ◽  
Negative Interference ◽  
Friction Resistance ◽  
Resistance Reduction ◽  
Wetted Surface Area

An optimum design of ship is to achieve the required speed with minimum power requirements. On multihull, sidehull position against to mainhull influences the friction resistance and its stability. Frictional resistance of multi-hull increases due to the addition of wetted surface area of hull, but wave making resistance can be lowered by a slender hull form. This research are experimental tests of trimaran with five Wigley hulls on a combination transom and without transom. The test varied on stagger, clearance and trim at several speeds. A ship with formation arrow tri-hull on forward was given to prove the resistance reduction due to cancellation wave which was indicated by negative interference. The influence diverse position of sidehull has shown that model non-transom (NT) stern moreover give beneficial resistance than model with transom (WT) at high speed. Similarly, in the trim conditions that NT more favorable on trim specifically for high speed depending on the position of the sidehull to the mainhull.

Cyclic Fracture Analysis of Semi-Natural Cast Iron Plate with Metallurgical Defects Layer

2010 ◽  
Vol 165 ◽  
pp. 61-65
Author(s):  
Marius Gutauskas ◽  
Jonas Bacevičius ◽  
Mindaugas Kazimieras Leonavičius
Keyword(s):  
Cast Iron ◽  
Cyclic Load ◽  
Fracture Process ◽  
Crack Formation ◽  
Fracture Analysis ◽  
Electronic Microscopy ◽  
Pure Bending ◽  
Iron Plate ◽  
Metallurgical Defects ◽  
Total Fracture

Fatigue fracture of the semi-natural cast iron plate with dross and carbon float defects was analyzed. Crack formation and propagation were traced under the programmable cyclic load of the pure bending. The focuses of the crack and their consistent pattern up to the total fracture were determined. Fracture analysis was performed by using optical and electronic microscopy methods. High-cycle fracture mechanism was established when the number of the cycles exceeded 108. The influence of the microstructure upon fracture process was investigated.

Mechanism Analysis of Emulsified Asphalt Cold Recycled Mixture

2013 ◽  
Vol 405-408 ◽  
pp. 1761-1766 ◽  
Author(s):  
He Jiang
Keyword(s):  
Asphalt Mixture ◽  
Frictional Resistance ◽  
High Strength ◽  
Hydration Reaction ◽  
Mechanism Analysis ◽  
Compact Structure ◽  
Mineral Aggregate ◽  
Friction Resistance ◽  
A Charge ◽  
Emulsified Asphalt

In this paper, the electrical analysis of emulsified asphalt and aggregate explains the reaction mechanism of the emulsified asphalt and aggregate. When emulsified asphalt and wet mineral aggregate contact each other, asphalt particles with a charge have chemical adsorption with aggregate at the surface of mineral aggregate, and asphalt particles are arranged on the surface of later quickly. Subsequently, asphalt of recycled mixture can be more cohesive after a series of process between emulsion and aggregate, such as demulsification and drying by distillation. A compact structure is formed by asphalt wrapping aggregate to make recycled mixture high strength. The mole - coulomb theory analyzes formation principle of emulsified asphalt cold recycled mixture strength. The strength of the recycled mixture mainly depends on the cohesion and internal friction among materials. In early stages, asphalt can not bonding because of water, which reduce the friction resistance of recycled mixture, and lead to the early strength of recycled mixture is small. After curing, the recycled mixture has the similar structure like hot asphalt mixture, which the cohesion and frictional resistance of recycled mixture became strong and the strength increased greatly. Besides, this paper expounds the dual role of cement that hydration reaction and of being active mineral powder in the process of emulsified asphalt cold recycled mixture strength formation.

scholarly journals XIV. On the temporary magnetic effect induced in iron bodies by rotation. In a letter to J. F. W. Herschel, Esq. Sec. R. S. by Peter Barlow, F. R. S. Communicated April 14th, 1825

1825 ◽  
Vol 115 ◽  
pp. 317-327 ◽  
Keyword(s):  
Cast Iron ◽  
Magnetic State ◽  
Magnetic Effect ◽  
Rapid Rotation ◽  
Iron Plate ◽  
Permanent Change ◽  
The Subject ◽  
Simple Inversion ◽  
Magnetic Poles

Dear Sir, It is more than two years since, in a conversation I had with you on subjects connected with magnetism, you enquired what effect I thought might result from giving to an iron ball a rapid rotation? The subject however dropped, and it did not occur to me again, till in some speculative views in which I was lately engaged, as to the cause of the rotation of the earth's magnetic poles, the apparent irregularity of the terrestrial directive powers, &c. I was led to consider that, probably, rotation might have a certain influence. We know that iron is rendered magnetic by various processes, as drilling, hammering, &c. and it was possible also by rotation; your query now occurred to my mind; and knowing at the same time that Mr. Christie had found a permanent change in the magnetic state of an iron plate by a mere change of position on its axis, it seemed highly probable this change, due only to a simple inversion, would be increased by a rapid rotation. In this respect, however, I was deceived; for I found afterwards, that all the effect that was produced was merely temporary; and if any permanent change did take place, it was too small in my cast iron shell to be observed with the small compass I employed in these experiments. Being however thus urged to the inquiry, as well by my own speculative views as by your query, and encouraged by Mr. Christie’s results, I resolved to put the idea to the test of experiment, and to attempt it at once upon a scale that should decide the question in the first instance.

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