Guangzhou Municipal Group Co.

Guangzhou, China

Guangzhou Municipal Group Co.

Guangzhou, China
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Lu Y.,Guangzhou Municipal Group Co. | Lu Y.,Shanghai University | An G.,Guangzhou Municipal Group Co. | Chen J.,Shanghai University
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | Year: 2014

Large deflection may occur in the traditional prestressed concrete (PC) composite box girder with corrugated steel webs if it is under the loading action for a long time, which endangers the bridge. In order to overcome this shortcoming, a new type of PC composite box girder, is presented as an alternative solution, i.e., the improved composite box girder with corrugated steel webs. On the basis of traditional theory of mechanics, by combining the finite element method and test method, the flexural strength of the improved composite box girder is studied. The conclusion is drawn that the improved composite box girder showed better ultimate capabilities, flexural rigidity, and the anticrack than the common composite box girder with corrugated steel webs. Therefore, this solution can overcome the shortcoming of large deflection in the traditional composite box girder with corrugated steel webs to a large extent. ©, 2014, Editorial Board of Journal of HEU. All right reserved.


Liu J.-F.,Tianjin University | Liu J.-F.,Guangzhou Municipal Group Co. | Liu J.-F.,Harbour Group | Zheng G.,Tianjin University | An G.-F.,Guangzhou Municipal Group Co.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2013

Since rigid-pile composite ground of a stable embankment deforms laterally, the rigid piles in the composite ground bear bending moment and may be cracked. The flexural capacity of rigid piles should be checked for the long-term stability of the embankment treated by rigid-pile composite ground. To reduce the difficulty of checking the flexural capacity of rigid piles in the composite ground under the embankment, the studies on simple methods for calculation of the bending moment of rigid piles are needed. First of all, the relationship between the maximum settlement and the maximum lateral deformation of embankments is statistically studied based on experimental and monitoring data of many soft ground and embankment projects of highways, and an empirical equation for the maximum settlement and the maximum lateral deformation of embankments is obtained. Then a simplified model for lateral forces of rigid piles is proposed using the lateral deformation curves of composite ground and rigid piles under embankments, and the relationship between the bending moment and the maximum lateral deformation of rigid piles is derived. The bending moment of rigid piles is suggested to be calculated according to the maximum settlement of embankments. The proposed method is proven to be simple and reasonable by an actual project. It is shown that the lateral deformation of piles is nearly equal to that of the surrounding soils, and the difference of lateral deformation between the piles and the soils can be neglected. The rigid piles can be thought to be fixed at the lower surface of soft stratum if their fixed length in underlying hard stratum is 7 times larger than their diameter.


Liu J.,Guangzhou Municipal Group Co. | Liu J.,Tianjin University | Liu J.,Guangdong Province Hangsheng Construction Group Co. | An G.,Guangzhou Municipal Group Co. | Zheng G.,Tianjin University
Applied Mechanics and Materials | Year: 2012

In order to study influence of unloading of vacuum on stability of embankment whose soft ground is improved by vacuum combined with preloading, the change of effective stress of soft clay in the improved area is analyzed when vacuum is unloaded and the undrained shear strength of soft clay in the improved area after unloading of vacuum is deduced. Changes of undrained shear strength of soil and stability of embankment owing to unloading of surcharge are also analyzed for comparison. It is shown by theoretical analysis, laboratory tests and a project that the undrained shear strength of soft clay improved by vacuum combined preloading is decreased after unloading of vacuum and the stability of embankment after unloading of vacuum should be taken into account for design. Safety factor of stability of embankment increases after unloading of surcharge since decrease ratio of load of embankment is more than decrease ratio of undrained shear strength of clay. © (2012) Trans Tech Publications, Switzerland.


Lu Y.-Q.,Tongji University | Lu Y.-Q.,Guangzhou Municipal Group Co. | Lu Y.-Q.,Capital Group | An G.-F.,Guangzhou Municipal Group Co. | Cheng J.,Tongji University
Beijing Gongye Daxue Xuebao/Journal of Beijing University of Technology | Year: 2014

To master the corrosion of reinforcing steel bar in reinforced concrete bridge-structures, the steel corrosion detection technology was researched by the method of test and finite element, based on wave theory, and the corrosion steel bar was chosen as the object. Results show that the detection technology is feasible in locating and recognizing steel corrosion, the detection technology has good practicability for its relatively high measurement precision; and the detection technology can be used in the locating and recognizing steel corrosion of reinforcing steel bar in reinforced concrete bridge structures.


Ye X.,Guangzhou Municipal Group Company Ltd | Ye X.,Changsha University | An G.,Guangzhou Municipal Group Company Ltd | An G.,Changsha University | And 2 more authors.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2014

Three different modal identification methods based on ambient vibration (multiple reference DOFs stabilization diagram algorithm (M-NExT/ERA), data-driven stochastic subspace identification (SSI/Data) and enhanced frequency domain fecomposition (EFDD)) were applied to the modal parameters identifacation of the Guangzhou New TV Tower (GNTVT). Then finite element analysis model of GNTVT was modeled using ANSYS, and the identified modal parameters results were used for the model updating based on genetic algorithm of GNTVT FEA model. The results indicate that the modal identification methods used in the paper are reliable, since the identified modal parameters has acceptable accuracy; the model updating method based on genetic algorithm has better effect on the first five modes, and can satisfy the engineering demand.


Wu Q.X.,Guangzhou Municipal Group Co. | Wu Q.X.,South China University of Technology | Wu Q.X.,Jinan University | An G.F.,Guangzhou Municipal Group Co. | And 2 more authors.
Applied Mechanics and Materials | Year: 2014

By using the explicit nonlinear dynamic analysis program of LS-DYNA, three-dimension finite element model of rock breaking by disc cutter of tunnel boring machine is established, in which elastic material is adopted to describe the elastic behavior of cutter ring and Holmguist Johnson Concrete (HJC) model is adopted to describe the brittle behavior of rock. With the finite element method, the process of rock breaking by disc cutter is simulated, and then the movement characteristics, forces of disc cutter and rock fragmentation mechanism are analyzed. The results indicate that the numerical technique can contribute to gaining an understanding of rock breaking mechanism by disc cutter and improving the design of disc cutter parameters. © (2014) Trans Tech Publications, Switzerland.


Wu Q.,Guangzhou Municipal Group Co. | Wu Q.,South China University of Technology | Wu Q.,Jinan University | An G.,Guangzhou Municipal Group Co. | And 3 more authors.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2015

In view of the typical characteristics of the soft and hard complex strata of Guangzhou area, the geological section of shield tunneling is simplified as the upper soft and lower hard binary stratum. Based on the Rostami equation of calculating rock-breaking force of disc cutter, a more perfect method of cutterhead mechanics analysis is built. By this new method, the values and changes of these mechanical parameters of cutterhead can be obtained, which include effective thrust, effective torque, overturning moment and unbalanced force in shield tunneling in complex stratum. Taking the shield construction of Tianhua section of Guangzhou metro line 3 for example, the cutterhead mechanical state is calculated. Then the theoretical reasons for the difficult attitude control of shield machine, serious wear of cutterhead and tools are explained on the basis of the above mechanical results. ©, 2015, Editorial Office of China Civil Engineering Journal. All right reserved.

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