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Zhang Y.,Nanjing Forestry University | Zhang Y.,Nagoya University | Bai S.,Hunan Provincial Communications Planning Survey and Design Institute | Zhang Q.,Changsha University of Science and Technology | And 2 more authors.
Construction and Building Materials | Year: 2015

This paper presented a experimental investigation into the advantage of RC member with shear strengthening using strain hardening cementitious composites (SHCC), focused on the crack pattern of SHCC strengthening layer and its obvious advantage for increasing the shear load carrying capacity of the strengthened RC member. Especially, the shear failed SHCC member was also adopted to reflect the reduced multiple fine crack distribution in SHCC strengthening layer. Moreover, the contributions of matrix and reinforcing fiber for shear load carrying capacity of SHCC strengthening layer were also calibrated respectively, and the shear load carrying capacity of SHCC strengthening layer was assumed as the sum of load carried by matrix and reinforcing fiber. This work provided experimental foundations for RC member with shear strengthening using SHCC. © 2015 Elsevier Ltd.


Zhang Y.,Nanjing Forestry University | Zhang Y.,Changsha University of Science and Technology | Bai S.,Hunan Provincial Communications Planning Survey and Design Institute | Yang Y.,Hunan Architecture Senior Technical School | Zhang X.,Central South University
Advances in Cement Research | Year: 2016

This paper presents a scheme of double-plane shear testing to investigate the shear transmission mechanism of strain-hardening cementitious composite (SHCC) after crack opening; the focus is on the shear stress transfer behaviour on the crack surface of the SHCC, contributed by both the contact effect of the matrix and the fibre bridging effect on the crack surface. The experimental results demonstrate that the transferred shear stress on the crack surface of the SHCC is contributed by both the contact effect of the matrix and the fibre bridging effect on the crack surface until peak shear stress, whereas after the separation of the crack surfaces, it is influenced solely by the fibre bridging effect. It is confirmed that the fibre bridging effect on the crack surface of SHCC has considerable influence in the shear fracture behaviour of SHCC. © 2016, ICE Publishing. All rights reserved.


Zhang Y.,Nanjing Southeast University | Zhang Y.,Nanjing Forestry University | Zhang Y.,Changsha University | Bai S.,Hunan Provincial Communications Planning Survey and Design Institute | Zhang Q.,Changsha University
Advances in Cement Research | Year: 2016

Strain-hardening cementitious composites (SHCCs) are an attractive construction material, due to their obvious advantage of large tensile strain capacity with pseudo strain-hardening, whereas this advantage is obviously reduced when SHCC is used for RC strengthening. This study investigated, experimentally and numerically, the localised behaviour of SHCCs for RC strengthening, with a focus on crack elongation performance and the ductility reduction of SHCC for RC strengthening. The numerical investigation was implemented using a proposed scheme that considers the localised behaviour of SHCCs for strengthening RC structures with cracks. The effectiveness of the numerical scheme was confirmed through a comparison of experimental and numerical results. © 2016, ICE Publishing. All rights reserved.


Huang X.-J.,Hunan Provincial Communications Planning Survey and Design Institute | Xu G.-L.,China Power Engineering Consulting Group Corporation | Peng L.,Hunan Provincial Communications Planning Survey and Design Institute
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | Year: 2011

In order to put forward the failure surface and bearing capacity formula of combined reinforced gabion retaining wall composed of the reinforced gabion retaining wall and green reinforced gabion retaining wall, the field test monitoring on a new type of reinforced support structure in the actual slope protection engineering of the 12 th contract section of Xiangtan-Hengyang West Line Expressway in Hunan Province was carried out. The strain distribution laws of the tied-reinforcement in different layers were obtained. Based on the new broken line potential failure surface whose kickpoint of the simplified failure surface is H/3 (H is the height of the retaining wall), the calculated formula of bearing capacity of the top surface of retaining wall under two failure modes of the broken line failure surface was deduced. Using the limit equilibrium method, the formula of ultimate bearing capacity under the condition of tensile failure was thoroughly discussed and this formula unifies the bearing capacity formula of the 0.3H simplified failure surface and that of the Rankine failure surface. The new broken line failure surface was compared with four typical failure surfaces. Results show that it is safer to calculate the failure mode by the broken line simplified failure surface than by the highway specification and BS8006, and it is more economic than the railway specifications. The failure mode of the reinforced earth retaining wall with double-twisted hexagonal steel wire mesh is the tensile failure mode. Test results agree well with calculated results.


Ning Q.C.,Hohai University | Yang X.,Hohai University | Shi Y.,Hohai University | Li L.,Hunan Provincial Communications Planning Survey and Design Institute
Applied Mechanics and Materials | Year: 2014

In the design and construction code for gravity quay, the inner floor of multi-ribbed buttressed quays generally is divided into two parts to calculate. The part within 1.5 times the rib spacing is as a three fixed edges and one simply-supported slab. The restriction effect of the three fixed edges is the same. However, because of the difference in thickness between vertical plate and rib with the change in the vertical direction of the flow, the effect of them is not the same. It will lead to the result deviating. Sometimes, there will be a phenomenon that the maximum bending moment of inner floor is smaller than the mid-span moment. Finite element software ANSYS was used to make a 3D numerical simulation on a buttressed quay in this paper. Shortcomings in the current code are addressed by comparing the calculation results. This can provide references for engineering design. © (2014) Trans Tech Publications, Switzerland.


Huang X.,Central South University | Huang X.,Hunan Provincial Communications Planning Survey and Design Institute | Xu G.,Central South University | Xu G.,Henan Institute of Engineering | Chen R.,Maccaferri Enviro Technology Co.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2010

According to the first expressway reinforced gabion retaining structure in China(reinforced earth engineering of Daqing-Guangzhou expressway section of Lanxi interchange AK0+939.38-AK1+079.71, BK0+296.55-366.18 in Hubei Province), the stability of steep reinforced gabion slope is evaluated by using strength reduction finite element method(FEM) on the platform of the finite element software Phase2 V6.0. Based on the results of limit equilibrium slice method, the effect of selected element on the results of strength reduction method is analyzed. A new method to determine the internal failure surface of reinforced earth structure by using FEM to calculate tension distribution of reinforcements is proposed. The influences of cohesion, internal friction angle, tension, earthquake force, gravity density and vehicle load on factor of safety are discussed. Thus, it can be effectively used to guide the specific engineering designs.


Kang M.-H.,Beijing Jiaotong University | Xie H.-H.,Beijing Jiaotong University | Qi Y.,Hunan provincial communications planning survey and design institute
Applied Mechanics and Materials | Year: 2014

According to the input and out put of the marshalling station's operating work, the thesis establishes the evaluation index system of the operation efficiency of the marshalling station, then it use the fuzzy DEA model to evaluate the efficiency of marshalling station's operation. At last, the thesis chooses 3 kinds of marshalling stations to calculate their operation efficiency, then compare and analysis them to prove the reasonable method. © (2014) Trans Tech Publications, Switzerland.


Jiang Z.,Hunan Provincial Communications Planning Survey and Design Institute | Zhang P.,Hunan Provincial Communications Planning Survey and Design Institute | Yi Z.,Hunan Provincial Communications Planning Survey and Design Institute
Modern Tunnelling Technology | Year: 2013

It is a challenge for tunnel builders to keep a tunnel portal stable in a shallow buried section with bias pressure, which directly relates to construction and operation safety. In order to address this issue, a new composite arching structure with an umbrella and piles was adopted. This utilized the supporting property of the piles to reduce the cutting height of the side slope. It also improved the bearing capacity of the arching structure in order to prevent the portal and portal slope from subsiding and slipping, ensuring safe construction and operation of the tunnel in the section of bias pressure and fractured soft rock. This paper introduces the new composite arching structure and its construction method, and a mechanical analysis is carried out.


Huang X.,Central South University | Huang X.,Hunan Provincial Communications Planning Survey and Design Institute | Jiang J.,Hunan City University
2010 International Conference on Intelligent Computation Technology and Automation, ICICTA 2010 | Year: 2010

Red-sandstone reinforced with hexagonal wire mesh is a new concept of composite reinforced soil. In order to study the mechanical properties of this composite reinforced soil, a series of laboratory triaxial compression tests on specimens reinforced with hexagonal wire mesh were carried out. 3D finite element method was introduced to simulate the triaxial tests. The macro stress-strain relation of the red-sandstone specimens reinforced with hexagonal wire mesh inclusions was reproduced and verified by 3D finite element model. The results indicate: finite element method is a ideal technique to study the mechanical characteristics of composite reinforced materials. The peak strength of red-sandstone are increased by hexagonal wire mesh reinforcements, and the peak shear strength arrives at a larger shear displacement than the plain red-sandstone specimen. © 2010 IEEE.


Yin P.-B.,Changsha University of Science and Technology | Yin P.-B.,Changsha University | He W.,Changsha University of Science and Technology | Cheng Y.,Hunan Provincial Communications Planning Survey and Design Institute | And 2 more authors.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2015

The displacement and the relevant reliability of a pile beneath column-supported bridge are investigated. Firstly, the bearing characteristics of the bridge pile in mountainous area are analyzed, and its differential equations are established and solved, by which the internal force and displacement along the pile shaft are obtained. Secondly, the main influence factors for the horizontal displacement are analyzed. Based on the displacement distribution solved by the limit state equations, the reliability index and failure probability indexes are solved by the checking point method. Finally, an real case of a bridge pile is analyzed by the proposed method, and the results agree well with those of the improved response surface method and Monte Carlo method. ©, 2015, Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering. All right reserved.

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