scholarly journals Experimental study on five-story full size apartment house of reinforced concrete walled frames

1971 ◽  
Vol 4 (3) ◽  
pp. 377-396
Author(s):  
Yorihiko Ohsaki ◽  
Makoto Watabe ◽  
Yutaka Matsushima
Keyword(s):  
Reinforced Concrete ◽  
Structural Design ◽  
Dynamic Test ◽  
Test Results ◽  
Apartment House ◽  
Loading Test ◽  
Full Size ◽  
Building Research Institute ◽  
Housing Corporation ◽  
Static Loading Test

This report is concerned with the experiment of 5-story full size apartment house of reinforced concrete walled frames, conducted by Building Research Institute entrusted by Japan Housing Corporation. The purpose of this experiment is to examine the characteristics of this type of structure under the seismic loading and to improve its structural design. The special feature of this specimen lies in, in a word, its economic design which is considered to be close to the structural and working criteria - the thickness and the length of the wall are 15cm and 12cm/m2 over the story, respectively, which are less than the limitations given by the requirements of Architectural Institute of Japan. Tests are divided into two parts. One is the horizontal static loading test carried out until the specimen collapsed, and the other is the dynamic test to investigate vibration properties in both elastic and plastic zones. The outline and results of these tests are presented together with the analyses of the test results.

Design Forces for Drift and Damage Control: A Second Look at the Substitute Structure Approach

1994 ◽  
Vol 10 (2) ◽  
pp. 319-331 ◽  
Author(s):  
John F. Bonacci
Keyword(s):  
Reinforced Concrete ◽  
Damage Control ◽  
Dynamic Test ◽  
Frame Structures ◽  
Rc Frame ◽  
Test Results ◽  
Structure Approach ◽  
Maximum Displacement ◽  
Design Loads ◽  
Rc Frame Structures

This paper explores the development of a method that is useful for design of reinforced concrete (RC) frame structures to resist earthquakes. The substitute structure method, originally proposed in the 1970s, makes an analogy between viscously damped linear and hysteretic response for the purpose of estimating maximum displacement. The evolution of the method is retraced in order to emphasize its unique reliance on experimental results, which are needed to establish rules for assignment of substitute linear properties. Recent dynamic test results are used to extend significantly the calibration of the method, which furnishes design loads on the basis of drift and damage control.

Strengthening of reinforced concrete corbels with GFRP overlays

2011 ◽  
Vol 18 (1-2) ◽  
pp. 69-77 ◽  
Author(s):  
Sevket Ozden ◽  
Hilal Meydanli Atalay
Keyword(s):  
Reinforced Concrete ◽  
Reinforcement Ratio ◽  
Fiber Reinforced Polymer ◽  
Peak Performance ◽  
Test Results ◽  
Loading Test ◽  
Load Bearing Capacity ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Normal Strength

AbstractThe strength and post-peak performance of reinforced concrete corbels, strengthened with epoxy bonded glass fiber reinforced polymer (GFRP) overlays, were experimentally investigated. The test variables were the corbel shear span to depth ratio, corbel main reinforcement ratio, and the number and orientation of the GFRP fibers. In total, 24 normal strength concrete, one-third scale, corbel specimens, without hoop reinforcement, were tested to failure under quasi-static gravity loading. Test results revealed that GFRP overlays can easily be used for the enhancement of corbel load bearing capacity, depending on the fiber orientation. The main reinforcement ratio and the number of GFRP plies were found to be the two main variables affecting the level of strength gain in the corbel specimens.

Application of a Reinforced Self-Compacting Concrete Jacket in Damaged Reinforced Concrete Beams under Monotonic and Repeated Loading

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Constantin E. Chalioris ◽  
Constantin P. Papadopoulos ◽  
Constantin N. Pourzitidis ◽  
Dimitrios Fotis ◽  
Kosmas K. Sideris
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
Small Diameter ◽  
Structural Response ◽  
Reinforced Concrete Beams ◽  
Repeated Loading ◽  
Test Results ◽  
Self Compacting Concrete ◽  
Loading Test ◽  
Flexural Response

This paper presents the findings of an experimental study on the application of a reinforced self-compacting concrete jacketing technique in damaged reinforced concrete beams. Test results of 12 specimens subjected to monotonic loading up to failure or under repeated loading steps prior to total failure are included. First, 6 beams were designed to be shear dominated, constructed by commonly used concrete, were initially tested, damaged, and failed in a brittle manner. Afterwards, the shear-damaged beams were retrofitted using a self-compacting concrete U-formed jacket that consisted of small diameter steel bars and U-formed stirrups in order to increase their shear resistance and potentially to alter their initially observed shear response to a more ductile one. The jacketed beams were retested under the same loading. Test results indicated that the application of reinforced self-compacting concrete jacketing in damaged reinforced concrete beams is a promising rehabilitation technique. All the jacketed beams showed enhanced overall structural response and 35% to 50% increased load bearing capacities. The ultimate shear load of the jacketed beams varied from 39.7 to 42.0 kN, whereas the capacity of the original beams was approximately 30% lower. Further, all the retrofitted specimens exhibited typical flexural response with high values of deflection ductility.

scholarly journals Local Behavior of Lap-Spliced Deformed Rebars in Reinforced Concrete Beams

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7186
Author(s):  
Agha Syed Muhammad Gillani ◽  
Seung-Geon Lee ◽  
Soo-Hyung Lee ◽  
Hyerin Lee ◽  
Kee-Jeung Hong
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
American Concrete Institute ◽  
Reinforced Concrete Beams ◽  
Local Behavior ◽  
Test Results ◽  
Loading Test ◽  
Lap Splices ◽  
Lap Splice ◽  
Ductile Behavior

Twelve full-scale reinforced concrete beams with two tension lap splices were constructed and tested under a four-point loading test. Half of these beams had shorter lap splices than that recommended by American Concrete Institute Building Code ACI 318-19; they failed by bond loss between steel and concrete at the lap splice region before rebar yielding. The other half of the beams were designed with a lap splice length slightly exceeding that recommended by ACI 318-19; they failed by rebar yielding and exhibited a ductile behavior. Several strain gauges were attached to the longitudinal bars in the lap splice region to study the local behavior of deformed bars during loading. The strain in a rebar was maximum at the loaded end of the lap splice and progressively decreased toward the unloaded end because the rebar at this end could not sustain any load. Stress flow discontinuity occurred at the loaded end and caused stress concentration. The effect of this concentration was investigated based on test results. The comparison of bond strengths calculated by existing equations and those of tested specimens indicated that the results agreed well.

scholarly journals Experimental verification of punching shear resistance of flat slab fragments

2021 ◽  
Vol 30 (4) ◽  
Author(s):  
Simona Šarvaicová ◽  
Viktor Borzovič
Keyword(s):  
Reinforced Concrete ◽  
Experimental Verification ◽  
Shear Resistance ◽  
Linear Analysis ◽  
Punching Shear ◽  
Test Results ◽  
Loading Test ◽  
Design Models ◽  
Flat Slab ◽  
Standard Design

The paper deals with the loading test results of an experimental reinforced concrete flat slab fragment, which was supported by an elongated rectangular column. The slab specimens were 200 mm thick and were designed without any shear reinforcement. By experimentally obtained punching shear resistance, the accuracy of the standard design models for prediction punching resistance was compared. The results of the experiments were also compared with the results of a numerical non-linear analysis performed in the Atena program.

A Field Experimental Study of Composite Foundation with Rammed Soil-Cement Pile in Collapsible Loess Area

2014 ◽  
Vol 1030-1032 ◽  
pp. 969-973 ◽  
Author(s):  
Hai Jian Sun ◽  
Shi You Zhang
Keyword(s):  
Composite Foundation ◽  
Engineering Properties ◽  
Test Results ◽  
Loading Test ◽  
Foundation Soil ◽  
Loess Area ◽  
Soil Cement ◽  
Static Loading Test ◽  
Natural Foundation ◽  
Field Static

Natural foundation in loess areas is collapsible; however, composite foundation with rammed soil-cement pile can be used to meet the load requirements of the building. Immersion-compression test and field static loading test were carried out to measure the treatment effect. The test results showed that: the collapsible of loess foundation can be eliminated by treatment with rammed soil-cement pile when the loading pressure is between 200 to 500 kPa. Engineering properties of the foundation soil between piles are improved. The parameters improve more obvious with the pile spacing getting smaller. The bearing capacity of composite foundation increased to 291 kPa, compared with natural loess foundation. The research results can be applied to design and construction of compacted soil cement pile composite foundation in loess area.

Performance Deterioration Behavior of Existing Reinforced Concrete Bridges

2009 ◽  
Vol 79-82 ◽  
pp. 1367-1370
Author(s):  
Xin Zheng An ◽  
Cheng Yi ◽  
Rui Xue Du
Keyword(s):  
Reinforced Concrete ◽  
Concrete Bridges ◽  
Stiffness Degradation ◽  
Loading Test ◽  
Reinforced Concrete Bridge ◽  
Concrete Deterioration ◽  
Reinforced Concrete Bridges ◽  
Static Loading Test ◽  
Performance Deterioration ◽  
Rebar Corrosion

The analyses of concrete from a bridge in Handan district shows that most bridges concrete should have cracked. The study of the technical measures against the performance deterioration of existing reinforced concrete bridges will undoubtedly become an imperative issue. In recent years, lots of bridges have been built in Handan. We choose a reinforced concrete bridge to investigate the effect of the effective member stiffness degradation and durability degradation induced by vehicle overload, vehicle overflow, rebar corrosion, and concrete deterioration on highway reinforced concrete bridges. And Static loading test was conducted at its middle span. Based on the test data in different circumstances, the seriousness of vehicle overload is discussed. In consequence, the performance of highway reinforced concrete bridges on stiffness degradation and durability degradation is more serious compared with the bridge under the condition of non-overloading. The results show that the process of rebar corrosion in highway reinforced concrete bridges is sped up under the condition of vehicle overload and vehicle overflow on the highway reinforced concrete bridges, which decreases the durability of the bridge structure, and the speed of the durability degradation increases as time goes on. The paper conclusion is instructive for the construction and maintenance of bridge.

Experimental Study Characterizing Retrofitting Method for Shear Walls at Nuclear Plant

2016 ◽  
Vol 11 (2) ◽  
pp. 354-361
Author(s):  
Shin-ichi Takezaki ◽  
◽  
Hideo Ono ◽  
Yoko Yasutomi ◽  
Seiya Katayama ◽  
...  
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Shear Walls ◽  
Test Results ◽  
Loading Test ◽  
Plane Shear ◽  
Cast Specimen ◽  
Out Of Plane ◽  
Static Loading Test ◽  
Monolithic Structure

One method of improving the earthquake resistance of shear walls protecting existing nuclear power plants is to retrofit the wall by installing additional rebars with concrete to produce a monolithic structure. We conducted a static loading test to confirm the structural performance of the walls when in-plane and out-of-plane shear forces act on the concrete joint faces produced by this retrofitting method. The test specimens consisted of those in which the concrete joint face was treated differently and a monolithically cast specimen for comparative purposes. The test results showed that the different treatments of the concrete joint face had very little effect on the strength or deformation performance, which were confirmed to be the same as those of the monolithically cast specimen.

Experimental Study on Shock Absorption Effect of Mechanical Device Utilizing Wedge and Rubber

2011 ◽  
Vol 82 ◽  
pp. 589-593
Author(s):  
Kazuyoshi Ishibashi ◽  
Satoshi Katsuki ◽  
Akinori Hirose ◽  
Kenji Tanaka
Keyword(s):  
Experimental Study ◽  
Impact Loading ◽  
Impact Load ◽  
Test Results ◽  
Mechanical Device ◽  
Loading Test ◽  
Absorption Effect ◽  
Static Loading Test ◽  
The Impact ◽  
Impact Absorption

This paper presents an experimental study on the impact absorption effect of the device which utilizes both shear deformation ductility of rubbers and a wedge mechanical system. Two types of experiments, i.e., static and impact loading, are carried out. Rate effect on resistance of the device is checked by comparison between static loading test results. The impact absorption effect is discussed by comparisons of the impact loading test between the impact load and the transmitting load. The other some impact absorption effects are discussed on the impact loading test.

Pile Bearing Capacity Improvement by Post-Grouting on Tip and Side

2011 ◽  
Vol 261-263 ◽  
pp. 1313-1318 ◽  
Author(s):  
Ji Feng Liu ◽  
Xiu Qin Cui
Keyword(s):  
Bearing Capacity ◽  
Static Loading ◽  
High Strain ◽  
Dynamic Test ◽  
Differential Settlement ◽  
Loading Test ◽  
Static Loading Test ◽  
Capacity Improvement ◽  
Post Grouting

For verifying pile bearing capacity improvement by post-grouting on tip and side and the decrease of building settlement, 10 tip and side post-grouting and 2 unpost-grouting piles are tested by low strain dynamic test, static loading test, stess distribution monitoring and high strain dynamic test, and the building settlement is monitored. It is indicated that all piles length and integrity are meeting the challenge, the post-grouting piles bearing capacity are at least 70% improved than that of unpost-grouting piles, designing pile bearing capacity as 8800kN is safer, the building maximal settlement and the differential settlement is satifying. The preliminary designed 904 piles are reduced to 531 by adopting post-grouting technique and about 20% cost of pile engineering is saved, the proper grouting stata choosing, the accurate grounting volume and pressure controlling in the post-grouting constrution process are needed.

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