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Lu P.,Zhejiang University of Technology | Lu P.,Zhejiang University | Lu P.,Shanghai Municipal Engineering Design and Research Institute | Xie X.,Zhejiang University | Shao C.,Shanghai Municipal Engineering Design and Research Institute
Construction and Building Materials | Year: 2012

This paper presents model test and numerical finite element analysis (FEA) on mechanical behavior of a typical composite bridge. The model test with scale of 1:30 of the composite bridge was conduct to fully understand the safety and serviceability. In the experiment, stress distribution, deflection resistance ability, dynamic property, and distortion effect of the Bridge's main control cross-section were carefully measured to investigate the mechanical performance and interaction between main bridge and ramp system. On the basis of the experimental results of the typical composite mode bridge, the model bridges were modeled as three-dimensional structures using commercially available software. The results of the finite element analysis are in good agreement with those of the tests in terms of strength and stiffness. The parameters considered herein were the bearing condition, longitudinal slope of ramp, ramp curved radii, and bifurcate diaphragm plate stiffness. It was also expected that the results presented in this paper would be useful as references for the further research and the design of the typical composite bridges. © 2011 Elsevier Ltd. All rights reserved.


Yue F.,Shanghai JiaoTong University | Zhao J.,Shanghai JiaoTong University | He H.,Shanghai Municipal Engineering Design and Research Institute | Wen X.,Shanghai Municipal Engineering Design and Research Institute
Key Engineering Materials | Year: 2012

In this paper, we discuss the design and calculation methods of Circular-shaped Corrugated Steel Culvert Pipe (CCSCP) used in highway construction. With many advantages such as lightweight, environment friendly, cost-effective, rapid construction, etc., Corrugated Steel Culvert Pipe (CSCP) have been widely used in highway construction acting as the alternative of RC culvert in China in recent years. It will not crack under impact loads or vibrations due to the inherent strength of steel and the flexibility of the corrugated pipe section. The high ring compression of the pipe absorbs and transfers the load to the surrounding soil around the entire circumference. In this paper CCSCP is a kind of culvert which is fabricated to a circular shape by several pieces of corrugated steel plates jointed by high strength bolts. In this paper, a serial test is conducted on site in process of the fabricating of the CCSCP used in the construction of Shanghai North Outer Ring Line Highway in China. In addition, 3D FEM analysis is performed with the intent of contrasting with the result of the test. Some design methods are proposed in this paper, and they will be useful guidelines for safe design of CCSCP. © (2012) Trans Tech Publications.


Xu Y.,Tongji University | Duan X.,Shanghai Municipal Engineering Design and Research Institute | Li J.,Tongji University
Structural Engineering and Mechanics | Year: 2014

In this paper, we present an alternative seismic design strategy for cable stayed bridges with concrete pylons when subjected to strong ground motions. The comparison of conventional seismic design using supplemental dampers (strategy A) and the new strategy using nonlinear seismic design of pylon columns (strategy B) is exemplified by one typical medium span cable stayed bridge subjected to strong ground motions from 1999 Taiwan Chi-Chi earthquake and 2008 China Wenchuan earthquake. We first conducted the optimization of damper parameters according to strategy A in response to the distinct features that strong ground motions contain. And then we adopted strategy B to carry out seismic analysis by introducing the elastic-plastic elements that allowing plasticity development in the pylon columns. The numerical results show that via strategy A, the earthquake induced structural responses can be kept in the desired range provided with the proper damping parameters, however, the extra cost of unusual dampers will be inevitable. For strategy B, the pylon columns may not remain elastic and certain plasticity developed, but the seismic responses of the foundation will be greatly decreased, meanwhile, the displacement at the top of pylon seems to be not affected much by the yielding of pylon columns, which indicates the pylon nonlinear design can be an alternative design strategy when strong ground motions have to be considered for the bridge. Copyright © 2014 Techno-Press, Ltd.


Zou Y.,Tongji University | Yu Y.,Tongji University | Zhang Y.,Jiatai Electrical Co. | Lu J.,Shanghai Municipal Engineering Design and Research Institute
Procedia Engineering | Year: 2012

Maximum power point tracking (MPPT) is one of the key technologies in photovoltaic generation system. Incremental conductance (IncCond) method is recognized as theoretically concise and effective among existed classic tracking algorithms, but the application of which was hindered by the rigid requirements upon the precision of hardware. Aim to solve this, an improved IncCond algorithm significantly reduces these requirements was presented in this paper and related experiments have been carried out to verify its effectiveness. © 2011 Published by Elsevier Ltd.


Lu P.,Zhejiang University of Technology | Lu P.,Shanghai Municipal Engineering Design and Research Institute | Shao C.,Shanghai Municipal Engineering Design and Research Institute
Proceedings of the Institution of Civil Engineers: Bridge Engineering | Year: 2014

This paper studies the non-linear dynamic behaviour of the steel-concrete composite, curved box beam by using the finite-element method. A three-dimensional finite-element model has been developed to obtain natural frequencies and mode shapes. A parametric study was also conducted to evaluate dynamic behaviour of composite, curved box beams. The results indicate that the frequencies of the composite box beam decreases slightly with an increase in the stud spacing (pitch of shear connector), but the frequencies and mode shapes change significantly when the stud spacing exceeds the double stud spacing (two times the pitch of the full shear connection). This tendency is particularly obvious in the extend mode shapes.


Dan D.,Tongji University | Xiao R.,Shanghai Municipal Engineering Design and Research Institute | Bai W.,Shanghai Municipal Engineering Design and Research Institute | Wen X.,Tongji University
International Journal of Distributed Sensor Networks | Year: 2015

A Fiber Bragg Grating (FBG) based wind pressure sensor (WPS) for structural surfaces is introduced, and wind pressure-strain conversion model as well as temperature compensation method is established. By using finite element analysis, the design of the wind-bearing carrier of the WPS is optimized such that the nominal measured values by the FBGs are maximized under the action of fundamental wind pressures suggested in codes. Furthermore, sensing characteristics of the WPS, as well as its static wind safety, pressure stability, and dynamic stability during operation, are investigated. Results demonstrate that the design scheme for the WPS, which is of good object sensing properties and working performance, is technically feasible. The final prototype of WPS is developed according to the proposed optimized design scheme. © 2015 Danhui Dan et al.


Lu P.,Zhejiang University of Technology | Lu P.,Zhejiang University | Shao C.,Shanghai Municipal Engineering Design and Research Institute
Proceedings of the Institution of Civil Engineers: Engineering and Computational Mechanics | Year: 2014

A theoretical formulation for the deflection of composite beams with consideration of interface slip is derived. The exact closed-form characteristic equations for composite beams with interlayer slip are derived for the boundary conditions. The equations also consider deflections and slips in the cross-section, leading to determinations of internal forces in the cross-section. Based on the research, practical applications are compared with the corresponding transformed section method. The results show that the theory is correct and convenient for solving problems of the analysis of steel- concrete composite box girders. Arbitrary cross-internal forces of the steel-concrete composite box girders are also obtained. The results provide a theoretical basis for the safe design of steel-concrete composite box girders.


Wang Y.,Shanghai Normal University | Liu J.,Shanghai Normal University | Wang C.,Shanghai Municipal Engineering Design and Research Institute
Advanced Materials Research | Year: 2011

A structure model of three-span continuous rigid frame bridge was constructed based on the finite element method. At first, the modal analysis was performed to get the natural frequencies and periods. The dynamic characteristics of the bridge structure were summarized, and some improvement measures are suggested to overcome the shortcoming for the bridge structure. Then, seismic response analysis was carried out based on the EL-Centro wave. The input excitations adopted the combination of vertical wave plus longitudinal wave, or vertical wave plus lateral wave. Based on the two excitation cases, some useful results were obtained, which include internal forces, displacements, accelerations time-history curves of the critical sections for the bridge structure. And some commentates about the time-history curves are given. At last, some helpful conclusions are drawn based on the calculation and analysis above. The calculation methods and results in this paper can provide some referenced information for the engineering design. © (2011) Trans Tech Publications.


Yue F.,Shanghai JiaoTong University | Wen X.,Shanghai Municipal Engineering Design and Research Institute
Applied Mechanics and Materials | Year: 2011

In this paper, we discuss the design and calculation methods of elliptical-shaped corrugated steel culvert pipe (ECSCP) used in highway construction. With many advantages such as lightweight, environment friendly, cost-effective, rapid construction, etc., corrugated steel culvert pipe (CSCP) have been widely used in highway construction acting as the alternative of RC culvert in China in recent years. The ECSCP in this paper is a kind of culvert which is fabricated to an elliptical shape with several pieces of corrugated steel plates which are jointed by high strength bolts. This study is conducted on the basis of the ECSCP used in the construction of Shanghai North Outer Ring Line Highway in China. 3D FEM analysis is performed considering several parameters such as modulus of elasticity of the surrounding backfill soil, length of major and minor axis of elliptical-shaped section, eccentricity of vehicles. Some design methods are proposed in this paper, and they will be useful guidelines for safe design of ECSCP. © (2011) Trans Tech Publications.


Zhan X.-J.,Zhejiang University | Lin W.-A.,Zhejiang University | Zhan L.-T.,Zhejiang University | Luo X.-Y.,Shanghai Municipal Engineering Design and Research Institute | Chen Y.-M.,Zhejiang University
Yantu Lixue/Rock and Soil Mechanics | Year: 2013

Before technical guideline of sludge treatment and disposal for municipal wastewater treatment plant [1]was implemented, tons of sewage sludge was directly poured into sludge lagoon in landfill, which took up designed landfill capacity of municipal solid waste. In order to restore storage capacity of landfill, treatment of sludge lagoon was undertaken. To investigate the feasibility of using vacuum preloading technique on sludge, two model tests were conducted. The experimental results showed that after vacuum preloading water content of sludge decreased sharply and its shear strength increased to 2-4 kPa. The consolidation coefficient of sludge displayed a nonlinear behavior in preloading process. Permeability and water content of sludge around prefabricated vertical drain decreased quickly in early stage, hindering consolidation of sludge away from prefabricated vertical drain. Therefore reducing spacing of prefabricated vertical drain could enhance treatment effect significantly. Pore pressure dissipation of sludge in preloading was different from that in soft clay, especially of the sludge distant from prefabricated vertical drain, which may reveal that pore pressure dissipation in sludge could not be explained by consolidation theory of Terzaghi. In vacuum preloading of sludge, intermittent inlet of boosted air could accelerate drainage rate in early stage; but overall its improvement was limited. Vacuum preloading method can be used as a technique of sludge reduction; but for the requirements of subsequent filling of municipal solid waste on the sludge lagoon, other in situ ground improvement methods should be adopted further to increase its shear strength.

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