Center for Engineering Research Test and Appraisal

Haidian District, China

Center for Engineering Research Test and Appraisal

Haidian District, China

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Tan J.,Center for Engineering Research Test and Appraisal | Wang J.,Center for Engineering Research Test and Appraisal | Zhai C.,Center for Engineering Research Test and Appraisal | Zhao Y.,West Corporation
ICPTT 2013: Trenchless Technology - The Best Choice for Underground Pipeline Construction and Renewal, Proceedings of the International Conference on Pipelines and Trenchless Technology | Year: 2013

The basic research method for this paper is the stratigraphic structure method, carrying out finite element analysis for the stress, strain and deformation of the subway shield tunnel lining segment, the segment joint and segment layup rubber cushion layer, based on considering three basic factors of subway shield tunnel buried depth, segment layup rubber material and ground heap load. The finite element analysis of this paper uses the three-dimensional entity finite element model(Koyama Y., Konishi S., Arai Y. and Okano N. (1997)), which includes lining segment, segment layup rubber layer and the surrounding soil. The research combines with the geological conditions of the Beijing subway, and takes into account of the tunnel lining design, rubber layer of material anticipates, the tunnel buried depth and many other factors. The results of the study show that the stress, strain and deformation of the whole subway shield tunnel lining segment and rubber layer is relatively homogeneous; the segment joints appear discontinuous displacement, which increases along with the tunnel buried depth increases ,with rubber layer elastic model decreases; the segment joints exist obvious tension stress concentration phenomenon, when tunnel buried depth exceeds 75 meters, the concentrated tensile stress is beyond the limit of reinforced concrete segments tensile stress. The study has a certain theoretical and practical value on the subway shield tunnel lining segment design. © ASCE 2013.


Zhai C.M.,Center for Engineering Research Test and Appraisal | Xie Q.,Center for Engineering Research Test and Appraisal | Bai W.L.,Center for Engineering Research Test and Appraisal | Lu Y.,Tianjin University | Liu Y.,Center for Engineering Research Test and Appraisal
Electronic Journal of Geotechnical Engineering | Year: 2015

In order to investigate the temperature effect of thermal power tunnel in the city under long-term high temperature load , in this paper, a 2D finite element model of thermal power tunnel and surrounding soil was established using ANSYS. Thermal-structure coupling effect was incorporated in the finite element model. The influence of different factors such as the buried depth, the air temperature inside the tunnel and the soil properties on the temperature and thermal stress distribution in the thermal power tunnel and surrounding soil was compared. Effective data were provided to benefit engineers in reinforcement and reconstruction of lining structure of thermal tunnel. © 2015 ejge.


Liu L.,China Academy of Building Research | Wang J.,Center for Engineering Research Test and Appraisal | Han J.,China Academy of Building Research | Zhang G.,China Academy of Building Research | Wu X.,China Academy of Building Research
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2013

In order to study the strut-and-tie model's influence parameters including concrete strength, shear span-to-depth ratio and reinforcement ratio, etc, eight concrete deep beams were tested. The specimens experienced elastic, elasto-plastic, and damage stages. The diagonal cracks occurred between bearing and the loading point. Failure models were mainly shear and bending shear failure. The smaller reinforcement ratio specimen exhibited bending failure, and ductile characteristics. The research results show that with reinforcement ratio (less than 1.5%) increased and shear span-to-depth ratio reduced, the specimen failure becomes shear failure, and strut strength is improved obviously. If reinforcement ratio (horizontal and vertical reinforcement ratio) is less than 1.5%, maximum principal stress angle is similar to the arc tangent angle of shear span-to-depth ratio, and a maximum principal stress angle of 54-degree is suggested. Based on research results and considering the horizontal, vertical reinforcement ratio, concrete strength and shear-span ratios, suggested strut-and-tie model formulas of concrete deep beams was deduced. The calculation results are in good agreement with experimental data.


Zhai C.,Tianjin University | Zhai C.,Center for Engineering Research Test and Appraisal | Han Q.,Tianjin University | Lu Y.,Tianjin University | Jin R.,Zhejiang Construction Engineering Group Co.
Applied Mechanics and Materials | Year: 2012

According to inspection and assessment technology and method for the ground masonry structure, this paper presents the inspection method and results for an electric cable tunnel with masonry structure. The contents of the inspection include masonry bricks strength grading, masonry mortars strength grading, concrete strength for crest slab, reinforcement of crest slab and appearance of masonry structure. And the technologies for identification are introduced. Therefore, the key problems for safety inspection of electric cable tunnel with masonry structure are solved. The inspection items, process and identification technologies presented in this paper are effective and applicable for electric cable tunnel with masonry structure. © (2012) Trans Tech Publications, Switzerland.


Zhai C.,Center for Engineering Research Test and Appraisal | Guo Y.,Center for Engineering Research Test and Appraisal | Lou Y.,CAS Institute of Electronics | Lu Y.,Tianjin University
Concrete Solutions - Proceedings of Concrete Solutions, 5th International Conference on Concrete Repair | Year: 2014

Structural fire design and fire prevention management face new challenges as more high-rise buildings are constructed. The evaluation of fire damage to such structures can help formulate efficient structural fire design and fire prevention management. The procedure for evaluating fire damage to concrete structures was discussed using a burnt high-rise building as an example. Such procedures included an emergency investigation of the fire site, an estimation of fire temperature, the initial division of floors and areas based on the visual damage they showed and the inspection of burnt structural members. The concrete structures were evaluated according to the degree of fire damage they received as well as their characteristics. Lastly, rehabilitation. measures for the concrete structures were proposed based on fire damage grades. © 2014 Taylor & Francis Group.


Han Q.,Tianjin University | Lu Y.,Tianjin University | Xu Y.,Tianjin University | Zhai C.,Tianjin University | Zhai C.,Center for Engineering Research Test and Appraisal
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2015

User defined constitutive model of steel was adopted to analyze the collapse mechanism of spatial latticed steel arches considering the impact of member buckling by IDA (Incremental Dynamic Analysis) method. The weak positions and the collapse ultimate displacements of spatial latticed arch were identified. The results show that the 95% fractiles of the collapse ultimate vertical displacement ranges from 1/154 to 1/104 of the structural span under vertical ground motion records. The middle of main truss is most weak. And under horizontal ground motion records, the 95% fractiles of the collapse ultimate horizontal displacement ranges from 1/40 to 1/28 of the column height. In such case, the weak position is at the column of main truss. When considering member buckling, the webs at the one-quarter point of the main truss will buckle due to large slenderness ratio. The numerical results based on IDA method are agree well with those by shaking table tests, which can provide reference for the collapse-resistant design of spatial latticed steel arches. ©, 2015, Editorial Office of China Civil Engineering Journal. All right reserved.


Tan J.,Center for Engineering Research Test and Appraisal | Wang J.,Center for Engineering Research Test and Appraisal | Zhai C.,Center for Engineering Research Test and Appraisal
ICPTT 2013: Trenchless Technology - The Best Choice for Underground Pipeline Construction and Renewal, Proceedings of the International Conference on Pipelines and Trenchless Technology | Year: 2013

A method of fuzzy clustering analysis was proposed to evaluate the structural safety. Based on the study of the municipal tunnel behavior, this paper used the numerical simulation method toanalyze the present condition of the tunnel, so as to obtain the present behavior and the influence law of the municipal tunnel .Four key factors were considered during the course of analysis, such as the reinforcement corrosion, the concrete crack, the tunnel water leakage and the soil liquid-plastic state. Then, used the fuzzy clustering analysis method to evaluate the safety of the tunnel. Moreover, take a typical electric power tunnel as an example, used the fuzzy clustering analysis to synthetically evaluate the safety grade, the results showed that the four factors above had different impact to the safety of the tunnel, through the results, we established a tunnel evaluation theory system to evaluate the structural reliability. The theory and method had important practical value to the tunnel engineering. © ASCE 2013.


Wang J.,Center for Engineering Research Test and Appraisal | Tan J.,Center for Engineering Research Test and Appraisal | Zhai C.,Center for Engineering Research Test and Appraisal | Wang L.,Center for Engineering Research Test and Appraisal
ICPTT 2013: Trenchless Technology - The Best Choice for Underground Pipeline Construction and Renewal, Proceedings of the International Conference on Pipelines and Trenchless Technology | Year: 2013

This paper used the numerical method to analyze the present conditions of the pipelines. Here considered the pipelines of three different diameters and materials to study the pipeline behavior when the nearby tunnel excavated, during the analysis, five key factors were discussed respectively when the tunnel excavates, including the horizontal distance and the vertical distance between the pipeline and the tunnel, the cross angle, the tunnel excavating procedure, the underground water table, then found the influence law of the pipelines when the tunnel constructed. Numerical simulation results showed that these factors above had different level effecting on the present conditions of the pipelines, the horizontal distance and vertical distance between the pipeline and the tunnel are the most influential factors, we must avoid the subway and pipeline parallel during the construction because the pipelines displacement will be very large, the impact the underground water table can not be neglected. 10 meters horizontal distance and 10 meters vertical distance near the concrete pipeline should not allowed doing the construction, that would result in grave consequences of the pipelines. © ASCE 2013.


He C.K.,Center for Engineering Research Test and Appraisal | Li H.Y.,Center for Engineering Research Test and Appraisal | Lv X.Z.,Beijing CEEDI Engineering Technology Company
Applied Mechanics and Materials | Year: 2014

This study proposes three structural support schemes for a forestage lighting gallery in a steel truss structure transformed into a lecture hall. The advantages and disadvantages of these schemes are analyzed and compared in terms of structural safety, disturbance implications, and professional cooperation on architectural decoration. A separate light steel frame supporting the forestage lighting gallery has more advantages than only the original truss components and is thus more suitable for the project. The three schemes are compared for the reference of designers confronting similar problems. © (2014) Trans Tech Publications, Switzerland.

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