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2014 2nd International Forum on Mechanical and Material engineering, IFMME 2014

作者： Chen, Mu Xue, Jiang Hong Department of Mechanics and Civil Engineering Jinan University/Key Lab of Disaster Forecast and Control in Engineering Ministry of Education Guangzhou 510632 China

ISBN: (纸本)9783038350798

In order to study the bridge of a rail transit line in Guangzhou city, we use the finite element program Midas/FEA. Combining with the structure characteristics of the bridge, we establish space finite element model of piers. The linear and nonlinear analysis have been done respectively. In view of the nonlinear analysis, we analyze the left and right bearing under the most unfavorable load and dead load. The results show that as the ordinary reinforced concrete structure, bridge piers are bending crack under the design load. The width of crack controlled by force is less than the design value, so the bridge piers are in a safe state and it does not affect the normal operation. We noticed that the crack in piers appear a feature that width of crack become narrow in points under force controlling, but in other areas the crack in piers appear a feature that width of crack become wide. We have a preliminary judgment that the cause of this phenomenon may be the construction quality such as the actual reinforced protective layer are excessive, cooling measures in the process of the construction of the pier head of mass concrete did not reach the designated position, maintenance measures were in place and so on. The construction quality cause combined effects of mass concrete shrinkage crack and the structure of normal stress fracture. © (2014) Trans Tech Publications, Switzerland.

关键词： Finite element method

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Finite element analysis on the redistribution of reaction at support

Finite element analysis on the redistribution of reaction at...

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2nd International Conference on Precision Mechanical Instruments and Measurement Technology, ICPMIMT 2014

作者： Chen, Mu Xue, Jiang Hong Gan, Neng Department of Mechanics and Civil Engineering Jinan University Key Lab of Disaster Forecast and Control in Engineering Ministry of Education Guangzhou 510632 China

ISBN: (纸本)9783038351948

We use the finite element software Midas FEA to set up space entity model, and discuss various factors including the stiffness of bearing, counteracting force of adjacent beam, the influence of the stiffness of bridge pier on reaction at support. In the practical engineering. Coupling of shear lag, stiffness of beam, bending-torsional coupling and partial load can also affect the redistribution of reaction at support. Through the simulation of the finite element software, we check the support of a railway bridge in Guangzhou city. In the end we found that the stiffness of beam can make the middle support have a tendency to increase. If we take all the factors into account, the force of the middle support will be greater than on the both ends of bearing and the force on the both ends of bearing will be approximately equal. © (2014) Trans Tech Publications, Switzerland.

关键词： Finite element method

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Entity analysis of shear lag about grooved beam

Entity analysis of shear lag about grooved beam

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2nd International Conference on Precision Mechanical Instruments and Measurement Technology, ICPMIMT 2014

作者： Chen, Mu Xue, Jiang Hong Gan, Neng Department of Mechanics and Civil Engineering Jinan University/Key Lab of Disaster Forecast and Control in Engineering Ministry of Education Guangzhou 510632 China

ISBN: (纸本)9783038351948

We establish the entity model of groove beams in Midas FEA. Then we compare and analysis the shear lag effect of prestressed reinforcement caused in different locations. It can provide some suggestions for prestressed rib of groove beams. The result shows that when the prestressed steel beam is located in the middle of small beam, the effect of shear lag is maximum and the shear lag effects of prestressed in two ends are similar, Prestressed reinforcement can be arrangement refer to the results. © (2014) Trans Tech Publications, Switzerland.

关键词： Reinforcement

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Experimental study on cementitious reactivity of MSTP sludge incineration ash

Experimental study on cementitious reactivity of MSTP sludge...

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2nd Global Conference on Civil, Structural and Environmental engineering (GCCSEE 2013)

作者： OuYang, Dong Lu, Liulei Wen, Xilian Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Jinan 510632 Guangdong Peoples R China

ISBN: (纸本)9783037859261

One of the main objectives of this study was to activate the pozzolanic activity of sludge, produced by municipal sewage treatment plants (MSTP), which makes it become an admixture to replace a part of cement in cement-based materials. Nowadays, a significant quantity of MSTP sludge is obtained in China, and the disposal of sludge presents a rising challenge for the environment, which is the reason why this paper examines the possibility of adding this waste product to cement-based materials. MSTP sludge was activated by thermal (Incineration) and mechanical (Grinding) treatment. Meanwhile, the changes in the crystalline structure of MSTP sludge incineration ash (MSA) were evaluated using X-Ray Diffraction (XRD), and mortar strength tests were carried out on the mortars containing MSA to investigate the reactivity of the produced materials. The obtained results revealed that the optimal activation conditions of MSA were as follows: incinerated at 800 C for 2.5 hours followed by fast cooling in air and then ground until 60 minutes. Moreover, we have observed that MSA has an appreciable effect on the increase in compressive strength of the mortars and using of 20% MSA as a replacement of part of cement could be considered the optimum content. More importantly, the tests showed that extract toxicity of heavy metals in MSA were much lower than the national standard though some heavy metals existed in MSA. These results demonstrate the feasibility of recycling MSTP sludge has become an admixture in cement-based materials for construction engineering.

关键词： MSTP sludge Cementitious reactivity Mortar Compressive strength

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Analysis of adhesively bonded pipe joints under torsion by finite element method

Analysis of adhesively bonded pipe joints under torsion by f...

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2014 Annual Congress on Advanced engineering and Technology, CAET 2014

作者： Wu, J.Y. Yuan, H. Han, J. MOE Key Laboratory of Disaster Forecast and Control in Engineering Institute of Applied Mechanics Jinan University Guangzhou China

ISBN: (纸本)9781138026360

Adhesively bonded pipe are extensively used in pipe system and pipeline failure under torsional loading is one of the most common failure modes. Owing to the complication of theoretical analysis, development of numerical method for optimized design and stress analysis of a strong joint remains a pressing issue. In this paper, a realistic bilinear local bond-slip law is employed for analyzing the behavior of adhesively bonded pipe joints under torsion, based on a parameters study by ANSYS finite element software. Several parameters (i.e. the shear modulus of pipe coupler) are considered for assessing shear stress distribution in the adhesive and load-displacement relationship of the interface. Finally, the factors influencing the interfacial behavior is analyzed. © 2014 Taylor & Francis Group.

关键词： Torsional stress

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Optimal sensor placement based on Tabu search algorithms

Optimal sensor placement based on Tabu search algorithms

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4th International Conference on Civil engineering, Architecture and Building Materials, CEABM 2014

作者： Zhan, Jie Zi Yu, Ling Department of Mechanics and Civil Engineering Jinan University Guangzhou 510632 China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou 510632 China

ISBN: (纸本)9783038351641

In this study, the Tabu search (TS) algorithm is introduced into the optimal sensor placement (OSP) problem in the field of the structural health monitoring and moving force identification. A TS-based OSP procedure is proposed and further evaluated by some numerical simulations on a 2D planar truss model. The mean values of off-diagonal elements in a modal assurance criterion (MAC) matrix are used as the optimization objective function. Based on the criteria of MAC, determinant of fisher matrix, matrix condition number, and the least mean square error, the TS-based OSP procedure is evaluated through comparing with ones due to both of the energy coefficient-effective independence (ECEFI) and the effective independence (EFI) algorithms. The results show that the proposed TS-based OSP procedure is feasible with a higher accuracy. © (2014) Trans Tech Publications, Switzerland.

关键词： Structural health monitoring

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A two step damage prognosis method for beam-like truss structures

A two step damage prognosis method for beam-like truss struc...

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4th International Conference on Civil engineering, Architecture and Building Materials, CEABM 2014

作者： Jia, Hao Kai Yu, Ling Department of Mechanics and Civil Engineering Jinan University Guangzhou 510632 China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou 510632 China

ISBN: (纸本)9783038351641

In this study, a two step damage prognosis method is proposed for beam-like truss structures via combining modal curvature change (MCC) with modal strain energy change ratio (MSECR). Changes in the modal curvature and the elemental strain energy are selected as the indicator of damage prognosis. Different damage elements with different damage degrees are simulated. In the first step, the finite element method is used to model a beam-like truss structure and the displacement modes are got. The damage region is estimated by the MCC of top and bottom chords of a beam-like truss structure. In the second step, the elemental MSECR in the damage region is calculated and the maximum MSECR element is deemed as the damage element. The simulation results show that this method can accurately locate the damage in the beam-like truss structure. © (2014) Trans Tech Publications, Switzerland.

关键词： Strain energy

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The Economic Performance of Ground-Source Heat Pumps

The Economic Performance of Ground-Source Heat Pumps

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4th International Conference on Structures and Building Materials (ICSBM)

作者： Gong, Peng Tang, Jian Jinan Univ Minist Educ Peoples Republ China Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China

ISBN: (纸本)9783038350859

Ground-Source Heat Pump(PSHP) was verified by US Environmental Protection Agency (EPA) as one of the most efficient air conditioning systems on present market. It has a higher efficiency than other heating systems from 50% to 70%, and a higher efficiency than other cooling systems from 30% to 50%. The working principle of PSHP determines its low operating costs. By comparing the total energy efficiency, the existing groundwater heat pump total energy efficiency is the highest, about 115%. The total energy efficiency for soil-source heat pump is up to 100%. But traditional air conditioning is far less than the level. Articles present a research on Ground-Source Heat Pump system and its cost with a scientific and objective principles. Ground-source heat pump is a new central air conditioning system of Low-carbon energy saving. Due to the high technical content, function requirement, and installation difficulty, the average initial investment of ground-source heat pump is much higher than traditional central air conditioning. Taking into account the added costs of heating systems based on traditional central air-conditioning, such as boilers, it will not deviate too much from it.

关键词： Buildings-air conditioning Ground-source heat pump Energy saving Energy consumption

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Finite-element analysis of buckle propagation in offshore pipelines

Finite-element analysis of buckle propagation in offshore pi...

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International Conference on Advanced engineering Materials and Architecture Science (ICAEMAS 2014)

作者： Lin Yizhou Xue Jianghong Tang Mingqiao Jinan Univ Dept Mech & Civil Engn Key Lab Disaster Forecast & Control Engn Minist Educ Guangzhou 510632 Guangdong Peoples R China

ISBN: (纸本)9783037859766

The buckle propagation phenomenon in offshore pipelines is an important subject of ocean engineering. The local buckling will easily propagate along the pipeline if the external hydrostatic pressure is high enough. The buckle propagation will seriously hinder the transmission of the oil. This paper focuses on the numerical calculation of buckle propagation pressure using ABAQUS software.

关键词： Finite-element Analysis Buckle Propagation Offshore Pipelines non-linear analysis

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Time-dependent behaviour of interactive marine and terrestrial deposit clay

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GEOMECHANICS AND engineering 2014年第3期7卷 279-295页

作者： Chen, Xiaoping Luo, Qingzi Zhou, Qiujuan Jinan Univ Coll Sci & Engn MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China Guangdong Tech Coll Water Resources & Elect Engn Guangzhou 510635 Guangdong Peoples R China

A series of one-dimensional consolidation tests and triaxial creep tests were performed on Nansha clays, which are interactive marine and terrestrial deposits, to investigate their time-dependent behaviour. Based on experimental observations of oedometer tests, normally consolidated soils exhibit larger secondary compression than overconsolidated soils;the secondary consolidation coefficient (C-a) generally gets the maximum value as load approaches the preconsolidation pressure. The postsurcharge secondary consolidation coefficient (C-a') is significantly less than C-a. The observed secondary compression behaviour is consistent with the C-a/C-c concept, regardless of surcharging. The C-a/C-c ratio is a constant that is applicable to the recompression and compression ranges. Compared with the stage-loading test, the single-loading oedometer test can evaluate the entire process of secondary compression;C-a varies significantly with time and is larger than the C-a obtained from the stage-loading test. Based on experimental observations of triaxial creep tests, the creep for the drained state differs from the creep for the undrained state. The behaviour can be predicted by a characteristic relationship among axial strain rate, deviator stress level and time.

关键词： secondary consolidation coefficient creep time-dependent interactive marine and terrestrial deposit clay laboratory

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