Jiangsu Transportation Research Institute

Nanjing, China

Jiangsu Transportation Research Institute

Nanjing, China
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Shan B.,Hunan University | Xiao Y.,Nanjing University of Technology | Zhang W.L.,Jiangsu Transportation Research Institute | Liu B.,Hunan University
Construction and Building Materials | Year: 2017

This paper reports testing results of various connections for composite beams made of concrete slab and glue-laminated bamboo (glubam) beam. Six types of composite connectors, commonly used in timber-concrete composite (TCC) beams, were tested under direct shear condition. The shear force-slip relationships were measured and all the relevant mechanical properties such as slip moduli and shear capacities were obtained. Compared with typical TCC beam connections, the Glubam-concrete composite (BCC) systems present several different characteristics. The shear failure along the notch, typical in TCC notched connectors was not observed for BCC system, however, the delamination cracking along the lamination layers occurred in some types of BCC connections. Based on the test results and analysis, six types of connectors can be classified into two categories, one with higher strength and stiffness but low ductility, and the other with lower strength and stiffness but higher ductility. A set of regression equation with a bilinear descent segment is also provided for simulating the shear-slip behaviors of each type connector. It is found that some of the connection systems including the notched connector, steel mesh connector, screw connector and pre-tightening notched connector, are more suitable and recommended for constructing BCC structures. © 2017

Xi Z.,Nanjing Southeast University | Xi Y.,Nanjing University of Science and Technology | Xiong H.,Jiangsu Transportation Research Institute
Journal of Bridge Engineering | Year: 2014

There are different connection patterns between the bridge decks and pylons of cable-stayed bridges. This paper presents an energy method of analysis for the in-plane ultimate load capacity of cable-stayed bridges with different deck and pylon connection patterns. The potential energy of the whole bridge, including the bridge deck, stay cables, pylons, and work done by external loads, is considered in the development of the bridge energy equation. The energy of the plastic zone is introduced into the bridge energy equation. Both geometric and material nonlinearities are taken into account in the analysis. The predictions of the proposed method show good agreement with experimental and ANSYS results. © 2014 American Society of Civil Engineers.

Zhao H.,Nanjing Southeast University | Sun W.,Nanjing Southeast University | Wu X.,Jiangsu Transportation Research Institute | Gao B.,Jiangsu Transportation Research Institute
Materials and Design | Year: 2012

The aim of this paper is to assess the effect of coarse aggregate gradation (A/B ratio, size 5-10. mm coarse aggregate weight/size 10-20. mm coarse aggregate weight) on the properties of self-compacting concrete (SCC). For this purpose, four SCC mixtures with A/B ratio for 4/6, 5/5, 6/4, 7/3 were prepared, the bulk density of aggregate with various A/B ratios was investigated, the effect of A/B ratio on the fresh properties, mechanical properties, porosity and durability properties of SCC was studied. The test results indicated that aggregate with A/B ratio for 6/4 has a maximum bulk density of aggregate, with the change in A/B ratio from 4/6 to 7/3, the initial slump flow, blocking and segregation ratio are decreasing, while the wet density of fresh SCC are increasing. SCC with A/B ratio for 6/4 had a maximum mechanical properties, least porosity, carbonation depth, chloride ion diffusion coefficient. Moreover, the damage of SCC under drying-wetting cycles was evaluated, it was found that SCC with various A/B ratios has a resemble behavior on resistance damage against drying-wetting cycles. © 2012 Elsevier Ltd.

Zhao H.,Nanjing Southeast University | Sun W.,Nanjing Southeast University | Wu X.,Jiangsu Transportation Research Institute | Gao B.,Jiangsu Transportation Research Institute
Materials and Design | Year: 2012

The effect of initial water-curing period and curing condition on properties of self-compacting concrete (SCC) was studied. Six different curing regimes were applied to the specimens, the first of which the sample was stored under initial water-curing periods of 3, 7, 14. days, in the remaining three regimes, the samples were continuous full water (FW) curing condition, continuous full standard (FS) curing condition and continuous full room (FR) curing condition. The mechanical properties of SCC under different initial water-curing period and curing condition were tested, the relationship between compressive strength of concrete and curing time was analyzed by linear regression, the strength-gaining rates of SCC were calculated by using this regression equation, the durability properties of SCC, i.e. the carbonation depth, the chloride ion diffusion coefficient of SCC, were also evaluated, the relationship between 28-days compressive strength and 28-days carbonation depths of SCC under different initial water-curing period and curing condition was studied. The test results showed that it is necessary to apply water-curing to SCC for the initial 7. days period to expose the pozzolanic activity, SCC under FR curing condition has a higher compressive strength, flexural strength, a lower carbonation depth and chloride ion diffusion coefficient than SCC under FS, FW curing condition. © 2011 Elsevier Ltd.

Wang H.-L.,Hohai University | Chu W.-J.,Hydrochina Huadong Engineering Corporation | He M.,Jiangsu Transportation Research Institute
Journal of Hydrodynamics | Year: 2012

The rock permeability is an important parameter in the studies of seepage and stress coupling. The micro-cracks and pores can initiate and grow on a small scale and coalesce to form large-scale fractures and faults under compressive stresses, which would change the hydraulic conductivity of the rock, and therefore, the rock permeability. The rock permeability is, therefore, closely related with the micro-cracking growing, coalescence, and macro new fracture formation. This article proposes a conceptual model of rock permeability evolution and a micro kinematics mechanism of micro-cracking on the basis of the basic theory of micromechanics. The applicability of the established model is verified through numerical simulations of in situ tests and laboratory tests. The simulation results show that the model can accurately forecast the peak permeability evolution of brittle rock, and can well describe the macro-experimental phenomenon before the peak permeability evolution of brittle rock on a macro-scale. © 2012 Publishing House for Journal of Hydrodynamics.

Chen Z.-J.,Hohai University | Zhang N.-N.,Hohai University | Zhang X.-W.,Jiangsu Transportation Research Institute
Journal of Central South University of Technology (English Edition) | Year: 2011

In order to realize information construction on settlement of pile-group foundation of Sutong Bridge, the monitoring instruments of high-precision micro-pressure sensor and hydrostatic leveling and settlement profiler were integrated synthetically. A set of practical multi-scale monitoring system on settlement of super-large pile-group foundation in deep water was put forward. The reliable settlement results are obtained by means of multi-sensor data fusion. Finite element model of pile-group foundation is established. By analysis of finite element simulated calculation of pile-group foundation, rules of settlement and uneven settlement obtained by monitoring and calculation results are coincident and the absolute error of settlement between them is 4.7 mm. The research shows that it is reasonable and feasible to monitor settlement of pile-group foundation with the system, and it can provide a method for the same type pile-group foundation in deep water. © 2011 Central South University Press and Springer-Verlag Berlin Heidelberg.

Yuan Y.,Jiangsu Transportation Research Institute
Modern Tunnelling Technology | Year: 2014

In light of psychological and physiological behaviors of drivers, this paper discusses design issues regarding tunnel portal shape and ambient landscape with the purpose of reducing risks to drivers entering a tunnel. The results show that the portal shape and ambient environment should be integrated, and it is recommended that the landscape be monotonous and unified. It is necessary to: conceal the surrounding engineering facilities as much as possible to reduce visual distractions, avoid the engraving of tunnel names, decrease the brightness around the tunnel portal, prohibit excessive embellishment, and restrict the use of symbolic portals.

Huang H.,Hydraulic Engineering Quality Supervision Station of Jiangsu Province | Shen J.,Jiangsu Transportation Research Institute
Advances in Science and Technology of Water Resources | Year: 2013

This paper introduces the correlative rules of the technical pre-acceptance work of hydraulic engineering, and summarizes the progress and the existing problems of the work. The strengthening and improving approaches of the technical pre-acceptance work, which include enhancing the understanding of the importance of the pre-acceptance work, paying more attention to the intermediate acceptance work, improving the correlative rules of the technical pre-acceptance work, trying the third-party commission method, and exerting the effect of technical pre-acceptance work, were proposed.

Tu S.,Jiangsu Transportation Research Institute
2010 2nd Conference on Environmental Science and Information Application Technology, ESIAT 2010 | Year: 2010

As an important stage of the whole traffic management, Road traffic safety evaluation is an effective method which is adopted to distinguish hidden accident, decrease the accident rate and the severity degree of accident. Combining with the road traffic saftty management of our country, the paper establishes an evaluation index system of the road traffic safety, analyzes the advantage and necessity of building road safety evaluation using geographic information system (GIS), and the function , design method of road safety evaluation system based on GIS are probed into. The road safety evaluation based on GIS can constitute the corresponding safety strategies, advance the traffic safety management level of our country ,prevent the accident effectively. ©2010 IEEE.

Jiangsu Transportation Research Institute | Date: 2012-07-26

A shear connector for corrugated sheet steel and concrete, comprises a flange plate welded at an upper end portion of the corrugated sheet steel, with more than one U-shaped steel channel welded in the longitudinal direction at an upper edge of the flange plate, the channel walls of each U-shaped steel channel being provided with two longitudinal sides, the left and right sides of the front and rear channel walls being respectively provided with corresponding holes or grooves, the left and right sides of the front and rear channel walls being respectively provided with corresponding holes or grooves, which penetrates and connects each of the steel channels; in the holes or grooves on the left and right sides of each U-shaped steel channel respectively, a vertically bent steel bar is provided, a bottom steel bar of each of the vertically bent steel bars penetrating the holes or grooves on the left or the right side in a longitudinal direction, both ends of the bottom steel bar being respectively bent upwards and extending to form a vertical steel bar.

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