Experimental Investigation on Anchorage Mechanisms of Self-Locked Anchor under Combined Tension and Shear

2010 ◽  
Vol 163-167 ◽  
pp. 3600-3603
Author(s):  
Ying Li ◽  
Dong Zi Pan ◽  
Lian Zhang
Keyword(s):  
Experimental Investigation ◽  
Bearing Capacity ◽  
Fracture Pattern ◽  
Ultimate Bearing Capacity ◽  
Design Codes ◽  
Design Recommendations ◽  
Experimental Parameters ◽  
Current Design ◽  
New Construction ◽  
New Type

Self-locked anchor is a new type of underreamed anchor, and which is more and more frequently used in both new construction and structural retrofitting or strengthening projects. Nevertheless, current design codes do not contain suitable design recommendations for these anchors. This study investigates the anchorage mechanisms of self-locked anchor under combined tension and shear loadings. The experimental parameters mainly include anchor diameters (Φ16 and Φ20) and loading angles (0°, 30°, 45°, and 60°). The present results indicate the characters of axial and transverse deformations, the ultimate bearing capacity, the fracture pattern of anchor, and the breakout model of concrete.

Analysis of Bearing Capacity of New-Type Formwork Support Frame

2013 ◽  
Vol 341-342 ◽  
pp. 1449-1452
Author(s):  
Qing Dun Zeng ◽  
Fang Liu
Keyword(s):  
Bearing Capacity ◽  
Structural Stability ◽  
Failure Process ◽  
Ultimate Bearing Capacity ◽  
Load Test ◽  
Solid Model ◽  
Finite Element Software ◽  
Support Frame ◽  
New Type ◽  
Security And Reliability

Various new type scaffolds have been introduced and developed in China. They are novel in structure and economic in material, but their security and reliability can not be ignored. This paper introduced a new chained formwork support frame with nine upright tubes and many cross-braced connections. Firstly, the load test of the support frame was performed in order to observe the failure process and to determine the ultimate bearing capacity. Then, the strength and stability of both single upright tube and a cross-braced rod were checked according to the existing specifications on scaffolds. Finally, a finite element software ANSYS was used to establish a solid model for the support frame. The structural stability was analyzed and the ultimate bearing capacity was calculated. The comparison between the computational and experiment results was carried out. The results show that the ultimate bearing capacity of the new chained formwork support frame is controlled by the structural stability.

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.

scholarly journals Development of a New Inflatable Controlled Anchor System and Experimental Study of pull-out Capacity

2019 ◽  
Vol 2019 ◽  
pp. 1-12
Author(s):  
Xuexiang Yang ◽  
Shanpo Jia ◽  
Caoxuan Wen ◽  
Yuanjie Liu
Keyword(s):  
Bearing Capacity ◽  
Field Tests ◽  
Ultimate Bearing Capacity ◽  
Inflation Pressure ◽  
Working Mechanism ◽  
Anchor System ◽  
System A ◽  
Pull Out ◽  
New Type ◽  
Soil Interface

Considering the deficiency of traditional anchors, we propose a new type of inflatable controlled anchor system in this paper. The working mechanism and its structural composition of newly designed inflatable controlled device are discussed in detail. To investigate the performance and pull-out capacity of this new anchor system, a series of field tests were carried out under different inflation pressure conditions. By comparing these test results with those of traditional grouting anchors, a full-process constitutive model of anchor-soil interface is proposed to depict the pull-out characteristics of the inflatable controlled anchor. The results show that the ultimate bearing capacity of the inflatable controlled anchor is greater than that of the traditional grouting anchor when the inflation pressure is greater than 0.2 MPa and the ultimate bearing capacity of this new anchor improves obviously with the increase of inflation pressure. When the inflation pressure reaches 0.4 MPa, the ultimate bearing capacity of the inflatable controlled anchor is 2.08 times that of the traditional grouting anchor. Through comparison with the experimental curves, the results of model calculation indicate that the proposed anchor-soil interface constitutive equation can describe the pull-out characteristics of the inflatable controlled anchor. The designed controlled anchor has the advantages of no grouting, recyclability, rapid formation of anchoring force, and adjustable anchoring force.

Experimental Research on Seismic Response of Heat-Insulating Perforated Brick Full-Scale Walls with Openings

2013 ◽  
Vol 353-356 ◽  
pp. 1896-1900
Author(s):  
Chuan Qing Liu ◽  
Ming Hai Li ◽  
Guang Chun Zhou ◽  
Zuo Yun Mei
Keyword(s):  
Bearing Capacity ◽  
Seismic Response ◽  
Axial Force ◽  
Masonry Wall ◽  
Ultimate Bearing Capacity ◽  
Full Scale ◽  
Window Opening ◽  
New Type ◽  
The One ◽  
Ultimate Displacement

Heat-insulating perforated brick is a new type energy-saving masonry material. In order to investigate seismic response of masonry wall with this new-type brick, a set of quasi-static full-scale cyclic tests are performed. The test results show that this brick owns a good cooperative work system between bearing layer and insulation layer, and vertical axial force is an obvious factor which affects seismic response of heat-insulating perforated brick walls. With the increase of vertical axial force, ultimate bearing capacity increases, however, ultimate displacement can be decreased. In the case of the same axial force, ultimate bearing capacity of the specimen wall with door opening is less than the one with window opening, and the ultimate displacement also is less than the one with window opening.

Experimental investigation of shell foundations on dry sand

1998 ◽  
Vol 35 (5) ◽  
pp. 847-857 ◽  
Author(s):  
Adel Hanna ◽  
Mohamed Abdel-Rahman
Keyword(s):  
Experimental Investigation ◽  
World War Ii ◽  
Bearing Capacity ◽  
Axial Loading ◽  
Ultimate Bearing Capacity ◽  
Embedment Depth ◽  
Foundation Engineering ◽  
Dense Sand ◽  
Geotechnical Design ◽  
Shell Foundations

Shells are usually used as structural elements in buildings. In Germany they showed remarkable resistance to the effects of bombing during World War II. About 1 decade later, the possibility of employing shells in foundation engineering was explored. Surveys of the literature indicate that shell foundations have been employed effectively in different parts of the world and were proven to provide an overall economical alternative to the conventional flat foundations. However, the geotechnical design of these footings remained the same as for their respective flat ones. Accordingly, the advantages of shell geometry in foundation engineering has not yet been explored in the design of these footings. The objective of the present study is to examine the overall geotechnical behavior of three types of shell foundations resting on sand under axial loading conditions, namely, triangular, conical, and pyramidal shells. Furthermore, the resulting bearing capacities and settlements will be compared with conventional strip, circular, and square flat foundations. The present paper presents an experimental study on nine foundation models tested on loose, medium, and dense sand states. The influence of shell configuration and embedment depth on the ultimate bearing capacity and settlement will be presented. The results of the present experimental investigation have shown the admirable performance of shell foundations with respect to ultimate bearing capacity and settlement characteristics. Shell foundations provide higher resistance to lateral loading as compared with flat ones, and thus they will perform better in earthquake regions.Key words: shell foundation, experimental investigation, bearing capacity, settlement, sand, geotechnical engineering.

Experimental Investigation of Seismic Behavior of a New Type Masonry Walls

2013 ◽  
Vol 639-640 ◽  
pp. 732-739
Author(s):  
Wei Chen ◽  
Fang Bo Wu ◽  
Xu Hong Zhou ◽  
Hai Lin Huang
Keyword(s):  
Experimental Investigation ◽  
Reinforced Concrete ◽  
Seismic Behavior ◽  
Seismic Resistance ◽  
Width Ratio ◽  
Masonry Walls ◽  
Reinforced Concrete Frame ◽  
Conventional Concrete ◽  
Experimental Parameters ◽  
New Type

Conventional concrete hollow blocks have vertical single or multiple holes and they have been extensively used in masonry structures and as infill walls in reinforced concrete frame structures. However, most masonry walls using conventional concrete hollow blocks have the shortcoming of poor seismic resistance. A new type concrete hollow block with horizontal-holes has been developed and it could significantly improve the seismic resistance of a masonry wall as well as simplify the construction processes. The new hollow blocks are very easy to build a wall in a construction site and, in particular, they enable a convenient construction of reinforced concrete (RC) horizontal strips in their horizontal cavities and such RC strips can be readily connected to the adjacent RC columns. This provides an innovative seismic resistant measure to enhance the seismic resistance of masonry walls. In order to evaluate the seismic behavior of the new type masonry walls, an experimental investigation was carried out and seven full scale wall specimens were tested under in-plane cyclic loading. The experimental parameters include the number of horizontal RC strips, strength of the hollow blocks, height/width ratio of a wall and, with or without a window opening in the wall. In this paper, the details of the experimental investigation and the main test results are presented and, the characteristics of the seismic behavior of these wall specimens are discussed in relation to the influence of the experimental parameters.

NUMERICAL AND EXPERIMENTAL INVESTIGATION ON A NEW TYPE ELECTRICAL HEAT STORAGE BASED ON FLAT MICRO HEAT PIPE

2018 ◽  
Author(s):  
Zeyu Wang ◽  
Yanhua Diao ◽  
Yaohua Zhao ◽  
Chuanqi Chen ◽  
Lin Liang ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Heat Pipe ◽  
Heat Storage ◽  
Micro Heat Pipe ◽  
New Type
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