Time filter

Source Type

Tian W.,Chongqing University | Saeed A.T.,T.Y. Lin. International Engineering Consulting China CO. | Yang J.,House and Urban Bureau of Lixian
Journal of Convergence Information Technology | Year: 2012

The cantilever construction method with non-framework cable hoisting erection for arch bridge is gaining popularity in recent years. The final stresses and deformations in a finished arch bridge are strongly dependent on the sequence of events during the construction and the erection procedure being used. Therefore, calculation of cable tension is an important step in any analysis of the performance of the bridge at the actual construction sequence. In this paper a method for calculation of tension in cables for construction of arch bridge using perturbation is presented, and it is applied in the construction of Daninghe Bridge to ensure that the arch rib is constructed to line and level. Interestingly, the proposed method is more accurate and shows faster convergence than the common cyclic method.

Meng J.,T.Y. Lin. International Engineering Consulting China CO. | Liu Z.,Nanjing Southeast University
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2013

Considering the irregular geometry, stiffness and mass distribution, the critical angle of seismic incidence for curved bridges was investigated. The yield condition for concrete structure under axial compression and bi-axial flexural moments were well depicted with Bresler Yield Surface, the most vulnerable direction for piers was therefore defined as the critical angle of seismic incidence. Based on obtaining the seismic responses in two orthotropic directions with the response spectrum analysis, a new algorithm was proposed considering multicomponent ground motion and the correlation of natural vibration modes. Furthermore, procedures for time history analysis were developed. Finally, an example of a closed circular ramp was given to illustrate the validity of the method.

Wu W.,CAS Wuhan Institute of Rock and Soil Mechanics | Wu W.,T.Y. Lin. International Engineering Consulting China CO. | Feng X.,CAS Wuhan Institute of Rock and Soil Mechanics | Zhang C.,CAS Wuhan Institute of Rock and Soil Mechanics | Qiu S.,CAS Wuhan Institute of Rock and Soil Mechanics
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2011

According to the geological conditions, field test, numerical analysis and the entire process of supporting design and construction of tunnels in Jinping II hydropower station, a classification method for failure modes of surrounding rock of deep tunnel in hard rock is established. All of failure phenomena are divided into 3 categories and 9 typical failure modes by the proposed method respectively based on demands of supporting and controlling factors. Furthermore, failure mechanisms and manifestations are analyzed;and controlling measures are provided. Specially, the mechanisms and corresponding controlling measures of rockbursts are discussed. The classification method is applied to identify and analyze various kinds of failure modes, all of which are revealed during excavation of tunnels in Jinping II hydropower station. The recommended controlling measures are adopted referring to the failure modes. The engineering practice indicates that the classification method is comprehensive and practical, which provides an effective way for on-site designers, geologists and constructors to optimize excavation and supporting design of deep tunnel in hard rock.

Yang M.-G.,Central South University | Li C.-Y.,T.Y. Lin. International Engineering Consulting China CO. | Chen Z.-Q.,Hunan University
Engineering Structures | Year: 2013

Non-linear hysteresis is a complicated mechanical characteristic for magneto-rheological (MR) damper. In this paper, a new simple non-linear hysteretic model for MR damper is proposed to represent the hysteretic behavior. First, the force-displacement and force-velocity loops under a range of currents, amplitudes and frequencies are obtained by mechanical behavior test of a RD1097 type MR damper. Then the model's parameters are identified by the non-linear least square method from test data and fitted by the polynomials as functions of the supplied current. Finally, the accuracy and the effectiveness of the model are demonstrated by the RMS errors comparison between the reconstructed hysteretic curves and the experimental ones, and further are verified by seismic response reduction experiment under three excitations including the sinusoidal wave, the Pingsheng Bridge earthquake wave and the El-Centro wave. The results show that the proposed model has higher accuracy than some of existing models with explicit functions and is easier to be identified than those models with non-linear differential equations. Therefore, the proposed model can be effectively applied to simulation analysis in engineering control subjected to frequency-fixed or random excitations. © 2013 Elsevier Ltd.

Meng J.,T.Y. Lin. International Engineering Consulting China CO. | Liu Z.,Nanjing Southeast University | Zhang J.-D.,Jiangsu Transportation Research Institute
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2014

The devastating Wenchuan earthquake caused substantial flexural failure of Huilan flyover located in Mianzhu City of Sichuan Province, China. Based on the investigation of the bridge damage, a three-dimensional mathematical model for eigenvalue analysis and non-linear time-history dynamic analysis was established. In nonlinear time-history analysis, the effects of elasto-plastic feature of material, boundary pounding and slippage of bearings on the seismic response of the flyover were studied with sensitivity analysis. Finally, based on the conclusions of qualitative and quantitative analysis, the seismic failure causes of Huilan flyover were obtained.

Discover hidden collaborations