Improved Model of Metro Segment Liner Endogenetic Forces

2013 ◽  
Vol 438-439 ◽  
pp. 1028-1031
Author(s):  
Yue Yang ◽  
Xiao Guo Chen
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structure ◽  
Research Result ◽  
Shield Tunnel ◽  
Reinforced Concrete Structure ◽  
New Model ◽  
Metro Tunnel ◽  
Improved Model ◽  
Design And Construction

Harbin metro, the first engineering is in the process of being built. Metro tunnel is supported by reinforced concrete structure. Commonly used model is used in design of shield tunnel liner. In this paper, the habitual model is improved. The joint of model of the habitual model is improved and the endogenetic force formulas for the new model are derived. At last, the derived formulas and the existing formulas are validated by Harbin first metro. According to the research result, we can know the formulas derived in the paper are credible and they have academic practical meaning for design and construction of the subway liner.

Analysis on Setting Joints Technology in the Concrete Structure Buildings

2014 ◽  
Vol 971-973 ◽  
pp. 2052-2056
Author(s):  
Yan E Hao ◽  
Yong Qiang Lan
Keyword(s):  
Reinforced Concrete ◽  
Service Life ◽  
Concrete Structure ◽  
Reinforced Concrete Structure ◽  
Engineering Construction ◽  
Structural Integrality ◽  
Design And Construction

If reasonable joint is set in the design and construction of concrete structure buildings in advance as required, it can not only avoid or alleviate structural cracking and guarantee the quality of engineering construction, but also be good to improve the structural integrality and durability and lengthen service life of the buildings. This paper states the main types and functions of joints in the design and construction of reinforced concrete structure buildings. Then the major forms of setting joint technology are analyzed and discussed so as to provide references for relevant engineering technicians.

Reinforced Concrete Structure of the Puppet Theatre in Ostrava

2015 ◽  
Vol 744-746 ◽  
pp. 217-221 ◽  
Author(s):  
Radim Čajka ◽  
Kamil Burkovič ◽  
Pavlina Matečková ◽  
David Sekanina ◽  
Marie Stara ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structure ◽  
Reinforced Concrete Structure ◽  
Underground Part ◽  
Puppet Theatre ◽  
Monolithic Structure ◽  
Interesting Structure ◽  
Ground Part ◽  
Design And Construction

The annex building for the alternative scene in the Puppet Theatre of Ostrava was designed and constructed as an interesting structure from raw face concrete. The size of the annex building is not so big. It is, however, distinct in terms of the shape and complexity. The annex building consists of the above-ground and underground parts and the outside amphitheatre. The above-ground part consists of a reinforced concrete monolithic structure with five floors. The façade is made from raw face concrete. The underground part comprises two underground floors and an inside amphitheatre which is connected to the outside amphitheatre. The paper describes the process and bottlenecks in the design and construction of the building which is interesting in terms of architecture and construction.

Study on the Improved Model of the Internal Force of the Shield Tunnel Segment

2010 ◽  
Vol 168-170 ◽  
pp. 2488-2492
Author(s):  
Yue Yang ◽  
Xiao Guo Chen
Keyword(s):  
Comparative Analysis ◽  
Internal Force ◽  
Calculation Model ◽  
Theory And Practice ◽  
Shield Tunnel ◽  
New Model ◽  
Study Results ◽  
Improved Model ◽  
Design And Construction

The design of the shiled tunnel segment is one of key and difficult problems in design of subway. The soil round the segments and the joint among them are tow factors must be considerd on the establishment of the calculation model of the segment. Simplification of joint in the calculation model of segment is improved,then a new model is built with the stratum-structure method. Taking Harbin Metro Line No.1 for example, a comparative analysis between the improved model and existing routine model is made. Then some conclusions are got from different deduction ratio of stiffness of joint.The study results show that the new model is tolerable,and significant to design and construction of tunnel segment in theory and practice.

Study on Harbin Metro Shield Tunnel Segment and the Deformation of Tunnel Rock

2013 ◽  
Vol 405-408 ◽  
pp. 1297-1300
Author(s):  
Yue Yang ◽  
Xiao Guo Chen
Keyword(s):  
Research Result ◽  
Calculation Model ◽  
Shield Tunnel ◽  
Resistance Force ◽  
New Model ◽  
Difficult Question ◽  
The Earth ◽  
Design And Construction

Deformation of segment and rock is one difficult question of the subway design. When building the calculation model of the liner we mainly think about the effect on the liner of the joint and the resistance force of the earth. In this paper the joint of the model of the used model is improved and the inner force formulas for the new model are derived. At last, the derived formulas and the existing formulas are validated by Harbin Metro Line 1. According to the research result, we can know the formulas derived in the paper are credible and they have academic practical meaning for design and construction of the subway liner.

Test and Study on Impact of Corrosion on Bond Force between Steel and Concrete

2010 ◽  
Vol 36 ◽  
pp. 176-181
Author(s):  
Xian Feng He ◽  
Shou Gang Zhao ◽  
Yuan Bao Leng
Keyword(s):  
Reinforced Concrete ◽  
Corrosion Rate ◽  
Concrete Structure ◽  
Steel Corrosion ◽  
Reinforced Concrete Structure ◽  
Bond Force ◽  
Steel Bars ◽  
Protection Layer ◽  
Corrosion Of Steel ◽  
The Impact

The corrosion of steel will have a bad impact on the safety of reinforced concrete structure. In severe cases, it may even be disastrous. In order to understand the impact of steel corrosion on the structure, tests are carried out to study corrosion and expansion rules of steel bars as well as the impact rules of corrosion on bond force between steel and concrete. The results show that wet and salty environment will result in steel corrosion; relatively minor corrosion will not cause expansion cracks of protection layers; when steel rust to a certain extent, it will cause cracks along the protection layer; when there exists minor corrosion in steel and the protection layer does not have expansion cracks, the bond force is still large and rapidly decreases as the corrosion rate increases.

Assessment of the aftertreatment quality of concrete

2021 ◽  
Author(s):  
Lisa Ptacek ◽  
Alfred Strauss ◽  
Clémence Bos ◽  
Martin Peyerl
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structure ◽  
Test Methods ◽  
Reinforced Concrete Structure ◽  
Process Step ◽  
Simple Tool ◽  
Lack Of Control ◽  
Complex Construction

<p>The curing of concrete is extremely important for the durability of a reinforced concrete structure. In practice, due to the complex construction processes, the very limited phases and the lack of control, aftertreatment is often neglected by executing companies. Hence infrastructure operators are therefore very interested in having a robust, simple tool that enables aftertreatment to be easily checked and, as a result, to convey the importance of this process step to the client. In the project presented here, classic and novel test methods are presented and discussed, as well as their suitability for the detection of the aftertreatment quality on laboratory samples and subsequently on some real structures.</p>

scholarly journals Numerical Analysis of a Moderate Fire inside a Segment of a Subway Station

2018 ◽  
Vol 8 (11) ◽  
pp. 2116 ◽  
Author(s):  
Rodrigo Díaz ◽  
Hui Wang ◽  
Herbert Mang ◽  
Yong Yuan ◽  
Bernhard Pichler
Keyword(s):  
Reinforced Concrete ◽  
Surface Temperature ◽  
Concrete Structure ◽  
Fire Test ◽  
Material Behavior ◽  
Sensitivity Analyses ◽  
Subway Station ◽  
Elastic Model ◽  
Reinforced Concrete Structure ◽  
Actual Distribution

A 1:4 scaled fire test of a segment of a subway station is analyzed by means of three-dimensional Finite Element simulations. The first 30 min of the test are considered to be representative of a moderate fire. Numerical sensitivity analyses are performed. As regards the thermal boundary conditions, a spatially uniform surface temperature history and three different piecewise uniform surface temperature histories are used. As regards the material behavior of concrete, a temperature-independent linear-elastic model and a temperature-dependent elasto-plastic model are used. Heat transfer within the reinforced concrete structure is simulated first. The computed temperature evolutions serve as input for thermomechanical simulations of the fire test. Numerical results are compared with experimental measurements. It is concluded that three sources of uncertainties render the numerical simulation of fire tests challenging: possible damage of the structure prior to testing, the actual distribution of the surface temperature during the test and the time-dependent high-temperature behavior of concrete. In addition, the simulations underline that even a moderate fire represents a severe load case, threatening the integrity of the reinforced concrete structure. Tensile cracking is likely to happen at the inaccessible outer surface of the underground structure. Thus, careful inspection is recommended even after non-catastrophic fires.

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