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Cai J.-G.,Nanjing Southeast University | Yu L.-Z.,Wenzhou Architectural Design and Research Institute | Wang F.,Nanjing Southeast University | Feng J.,Nanjing Southeast University | Zhang C.-S.,Nanjing Design Institute of Civil Architectural
Tumu Jianzhu yu Huanjing Gongcheng/Journal of Civil, Architectural and Environmental Engineering | Year: 2010

Based on the discussion of the simulation for the cable prestress, the rigidity theory was used to identify the geometrical dimensions of semi-rigid structures in zero state. When the structural geometry in initial state is given, the geometrical dimension in zero state is determined by the initial prestress distribution. The contribution-matrix method is firstly applied to get the initial lack of fit. However, the influencing factor of initial lack of fit on the displacement of control point is linear superposition, that is, the structural response is linear, and it is irreconcilable with the geometry nonlinear of semi-rigid structure. In order to reduce the error of nonlinear structural response, the influencing factor in the contribution-matrix method is revised, and modified contribution-matrix method is put forward. Programs by ANSYS parameter design language APDL are worked out for the form-finding analysis of beam-string structure of a practical project. The numerical results show that the modified contribution-matrix method reduces the errors of the assumption of structural linear response. And it can be applied to the form-finding of semi-rigid structures with small stiffness.


Ye Q.,Wenzhou Architectural Design and Research Institute | Wang J.,Wenzhou University | Sun Q.,Zhejiang University | Yang F.,Wenzhou University | Hu X.,Wenzhou Architectural Design and Research Institute
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2013

At present, few in-situ experiments have been conducted on thin-wall tubular piles about load transfer properties, and few studies have been reported about thin-wall tubular piles in tidal soil foundation treatment. Hence, based on the region #1 of the first-period peninsula in Wenzhou tidal land, in-situ static load tests were performed on thin-wall tubular piles. According to test data, load transfer properties were analyzed. The results indicate that about 75% of the load at pile head is shared by the outer frictional resistance, and the long piles work as end-bearing frictional piles under the maximum load while the short piles work as pure frictional piles. In order to increase bearing capacity, thin-wall tubular pile can be lengthened and widened appropriately. Industrial workshops within 5 floors can be built in this area. The axial force decreases with the increasing depth, and the outer frictional resistances of upper and lower soils work asynchronously. With the increase of load, side resistance softening happens when the frictional resistance of upper soil is up to the ultimate value. The inner frictional resistance is generated from the end of pile and it is about 20%-25% of the outer frictional resistance. When the thin-wall tubular piles are applied to reinforcement of tidal soil foundation, the contribution of inner frictional resistance of soil to bearing capacity should be taken into account.


Cai F.,Nanjing University of Technology | Cai F.,Wenzhou Architectural Design and Research Institute | He L.,Nanchang Hangkong University | Zhou X.,Nanjing University of Technology | And 2 more authors.
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2013

Based on the finite element analysis of software ABAQUS, the one-dimensional subroutine of continuous drainage boundaries was developed. Results comparison among the classic Terzaghi's one-dimensional consolidation theory, the analytical solutions of Terzaghi's one-dimensional consolidation equation with continuous drainage boundaries and the analytical solutions of one-dimensional consolidation for a double-layered ground to verify the correctness. According to the layered ground of practical engineering, one-dimensional consolidation problem with continuous drainage boundaries in layered ground was investigated by using changes in different elastic moduli, permeability coefficients and poisson's ratios with the finite element analysis. The results show that continuous drainage boundaries can simulate the practical engineering commendably.


Wu Q.-L.,Nanjing University of Aeronautics and Astronautics | Wu Q.-L.,Wenzhou Architectural Design and Research Institute | Yu H.-F.,Nanjing University of Aeronautics and Astronautics | Chen X.-X.,Wenzhou Medical College
ICCTP 2010: Integrated Transportation Systems: Green, Intelligent, Reliable - Proceedings of the 10th International Conference of Chinese Transportation Professionals | Year: 2010

Based on the damage failure criterion of concretes, the mass loss rate is introduced as a damage variable to describe the concrete damage. The mass loss characteristics and evolutional law of concretes subjected to corrosion or freezing-thawing conditions are investigated. The results show that mass loss of concretes can be represented by either a single-segment loss mode or a double-segment loss mode, and the typical mass loss curves include a straight line, a parabolic line and the combination of straight and parabolic lines. On this basis, a mass loss mathematics model, which can be universally applied, is established. Two new concepts, namely, mass loss velocity and mass loss acceleration, are brought forward for the first time. The physical meaning of these parameters are also theoretically clarified. Furthermore, the results of model prediction show that there is good agreement between measured data and predicted data, which indicates that the model behaves well to predict the service life of concretes. It provides a new method for service life prediction of concretes. © 2010 ASCE.


Li J.,Zhejiang University | Xie X.,Zhejiang University | Zhang Q.,Wenzhou Architectural Design and Research Institute | Fang P.,Zhejiang University | Wang W.,Zhejiang University
Journal of Performance of Constructed Facilities | Year: 2014

A high-rise building with pile-raft foundation suddenly experienced extraordinary settlements and seriously tilted after 6 years of use in Wenzhou, a city in southeastern China. Some investigations were conducted and several potential causal factors were analyzed to determine the cause of the distress. The results indicated that the inadequate bearing capacity of the pile foundation was the reason for the extraordinary settlement. Inappropriate structure type selection and structural arrangement made the building sensitive to earthquake-triggered loading and prone to tilt. Remedial measures were applied to address the causal factors identified. Because of the low bearing capacity of the pile foundation, unloading was first performed and then the pile foundation was strengthened using steel pipe piles driven by anchor bolts. To address the inappropriate structure type and arrangement, the building was retrofitted to resist earthquakes. Observation results showed that the remedial measures took effect and the settlement (and tilt) of the building was completely controlled. © 2014 American Society of Civil Engineers.


Ye Q.,Wenzhou Architectural Design and Research Institute | Wu Q.-L.,Wenzhou Architectural Design and Research Institute
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2010

Based on monitoring of a deep foundation pit, analysis on the horizontal displacement, deep horizontal displacement, building settlement, column settlement and axial force is carried out, and deformation characteristics of horizontal displacement are investigated deeply. The monitoring results show that horizontal displacements develop with the process of construction time in a subsection parabolic. Building settlement increases with the increase of time, and the increasing velocity changes slowly and after quickly. The size and distribution of deep horizontal displacement is related to excavation depth, supporting structure stiffness, brace rigidity, geological conditions as well as ground overload. The results of the monitoring confirm the deformation control design of the supporting structure, which meet the requirements of both design and environment. The designing is both reasonable and effective.


Yan C.,Zhejiang University | Wu Q.,Wenzhou Architectural Design and Research Institute
WIT Transactions on the Built Environment | Year: 2013

In order to determine the relative dynamic modulus of elasticity and mass loss rate of concrete subjected to salt spray corrosion and seawater attack, a nondestructive detection method was adopted and a condition of marine salt spray and underwater area was simulated in this test. It is to investigate the damage evolutional law, characters and damage degree of concrete, and to compare the deterioration of concrete in the two kinds of environment. Based on the concept of damage degree, the influences of slag content and concrete strength on concrete damage degree were discussed in depth. The results show that the change tendency of the relative dynamic modulus of elasticity exhibits 4 stages, while mass loss change represents 2 stages. The deterioration of salt spray corrosion is more serious than that of seawater attack, the damage degree of concrete enlarges with the increasing of slag content and is greatly influenced by the concrete strength. © 2013 WIT Press.


Wu Q.-L.,Nanjing University of Aeronautics and Astronautics | Wu Q.-L.,Wenzhou Architectural Design and Research Institute | Yu H.-F.,Nanjing University of Aeronautics and Astronautics | Liang L.-M.,Nanjing University of Aeronautics and Astronautics
Sichuan Daxue Xuebao (Gongcheng Kexue Ban)/Journal of Sichuan University (Engineering Science Edition) | Year: 2010

An exposure experiment of concrete was carried out in marine atmospheric environment, the total chloride ion and free chloride ion contents of concrete were determined. The characteristics of free chloride ion and bound chloride ion contents changing along with time were investigated in the process of chloride ion diffusion. Meanwhile, chloride ion binding capacity was calculated at each different exposure time and diffusion depth, and the effect of exposure time and diffusion depth on chloride ion binding capacity of concrete were discussed by regression analysis. The results showed that the chloride ion binding capacity is the power function of exposure time and meets cubic polynomial function with diffusion depth. The fitted values agree well with the measured values and it indicate that the functions are efficient.

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