Abstract:In order to promote the application of angle-steel confined high-strength concrete （ACHC）columns in new construction and reinforcement projects of civil engineering, this paper took the hoop coefficient, strength grade of concrete and yield strength of steel as parameters, 15 angle-steel confined high-strength concrete（ACHC）short columns with a shear span ratio of 1.5 were designed under axial compression. Based on simplified steel constitutive model and confined concrete constitutive model considering hoop effect, the finite element simulation analysis on them was carried out, by comparing with the experimental data the rationality of finite element modeling is verified. The author investigate the influence for different hoop coefficient, different concrete strength grade and different yield strength of steel to mechanic behavior of ACHC short columns. Considering the hoop effect of batten plate to concrete, the influence factor of the slab is introduced, and the linear relationship between the influence factor and the hoop coefficient is inverted by using 1stopt software. Calculation formula of ultimate bearing capacity of ACHC short columns under axial compression is gotten and design method and design suggestion of this kind of short column is put forward. The results show that hoop coefficient for influence of bearing capacity and ductility of short column is more significantly than other parameters, which can lay a foundation for application of this kind of short columns in new construction and reconstruction projects.

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	1. Numerical Analysis and Application on Angle-steel Confined High-strength Concrete Short Columns under Axial Compression Based on ANSYS Software
	JI Jing,ZHANG Yunlei,ZHANG Wenfu,YUAN chaoqing,LIU Yungchun,WANG Shuwei,XU Songzhi
	Civil and Architectural Engineering 02 January 2016
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	Abstract:In order to promote the application of angle-steel confined high-strength concrete （ACHC）columns in new construction and reinforcement projects of civil engineering, this paper took the hoop coefficient, strength grade of concrete and yield strength of steel as parameters, 15 angle-steel confined high-strength concrete（ACHC）short columns with a shear span ratio of 1.5 were designed under axial compression. Based on simplified steel constitutive model and confined concrete constitutive model considering hoop effect, the finite element simulation analysis on them was carried out, by comparing with the experimental data the rationality of finite element modeling is verified. The author investigate the influence for different hoop coefficient, different concrete strength grade and different yield strength of steel to mechanic behavior of ACHC short columns. Considering the hoop effect of batten plate to concrete, the influence factor of the slab is introduced, and the linear relationship between the influence factor and the hoop coefficient is inverted by using 1stopt software. Calculation formula of ultimate bearing capacity of ACHC short columns under axial compression is gotten and design method and design suggestion of this kind of short column is put forward. The results show that hoop coefficient for influence of bearing capacity and ductility of short column is more significantly than other parameters, which can lay a foundation for application of this kind of short columns in new construction and reconstruction projects.
	TO cite this article:JI Jing,ZHANG Yunlei,ZHANG Wenfu, et al. Numerical Analysis and Application on Angle-steel Confined High-strength Concrete Short Columns under Axial Compression Based on ANSYS Software[OL].[ 2 January 2016] http://en.paper.edu.cn/en_releasepaper/content/4674742


	2. Design point of the first excursion problem of linear structures subjected to stochastic wind loads
	WANG Jia
	Civil and Architectural Engineering 23 December 2015
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	Abstract:In this paper the first excursion problem of linear structures subjected to stochastic wind loads is considered. In the space of random variables introduced to model the stochastic excitation, the failure domain of the problem can be expressed as a union of quadratic elementary failure domains. In this paper, the procedures using gradient projection method are proposed for obtaining the design point of the quadratic elementary failure domain, which can provide some insights into enhancing the efficiency of the previously developed simulation method for the concerned first excursion problem. An illustrative example involving an along-wind excited steel building shows the performance of the proposed procedures.
	TO cite this article:WANG Jia. Design point of the first excursion problem of linear structures subjected to stochastic wind loads[OL].[23 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4673112

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	3. A FE model for studying high frequency vibration characteristics of simply-supported box-girder
	SONG Lizhong,LI Xiaozhen,ZHANG Xun,LI Yadong
	Civil and Architectural Engineering 02 December 2015
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	Abstract:A track-bridge coupled vibration model was established based on finite element method to simulate a 32 m high-speed railway simply-supported prestressed concrete box-girder with a CRTS type II slab ballastless track system. Acceleration mobilities of track slab and box-girder's top slab in frequency band from 10 Hz to 1000 Hz was calculated using the finite element model. To validate the reliability of the model, an in-situ hammer excitation test was conducted. The test and calculated results were compared and agreed well, which indicate that the high frequency vibration characteristics of box-girder can be accurately simulated by the model.
	TO cite this article:SONG Lizhong,LI Xiaozhen,ZHANG Xun, et al. A FE model for studying high frequency vibration characteristics of simply-supported box-girder[OL].[ 2 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4668294


	4. Mechanical Properties of Grouting Materials for Heavy Metal Contaminated Soil in Acid Conditions
	YANG Yuyou,LI Xiangqian,DOU Haijun
	Civil and Architectural Engineering 01 December 2015
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	Abstract:Fast anti-seepage and anti-corrosion are two difficult problems to be solved in an acid environment having abundant water and high content heavy metal. In this study, new grouting material with acid corrosion resistance was formed by adding slag and fly ash to cement-water glass two-shot grouting material. It is noted that the rapid setting of two-shot grout was maintained. Setting time and fluidity were tested and both satisfied the requirements of actual engineering. Scanning electron microscope (SEM), Uniaxial compressive strength test, and X-ray diffraction (XRD) were used to test the microstructure of grout gels, mechanical properties, and components, respectively. Before and after corrosion, uniaxial compressive strength of new grouting material was 16.8MPa before the corrosion and the strength was 10.6MPa after the corrosion signifying the corrosion resistance.Test results of XRD and SEM indicated that hydration products dissolution and microstructure destruction are the main reasons which decreases the grout gel strength due to acid corrosion.
	TO cite this article:YANG Yuyou,LI Xiangqian,DOU Haijun. Mechanical Properties of Grouting Materials for Heavy Metal Contaminated Soil in Acid Conditions[OL].[ 1 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4662199


	5. Failure Behavior of Jointed Rock Mass under Shear Test
	LI Yong,ZHOU Hao,ZHU Weishen,LI Shucai,LIU Jian
	Civil and Architectural Engineering 28 November 2015
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	Abstract:Large amounts of faults, joints and fissures were existed in rock mass. These structural planes, to some extent, remarkably reduce the strengths of rock mass, including the shear behavior. In this paper, the authors report a physical model test on jointed rock mass under direct shear stress state and also adopt a numerical method, Discontinuous Deformation Analysis for Rock Failure (DDARF), to simulate the shear failure process, the variation of stresses and displacements of some key monitoring points. The comparative analysis demonstrates that the numerical results are favorable with those obtained in the physical model test. Therefore, it is concluded that the method of DDARF could effectively simulate the shear behavior of jointed rock mass.
	TO cite this article:LI Yong,ZHOU Hao,ZHU Weishen, et al. Failure Behavior of Jointed Rock Mass under Shear Test[OL].[28 November 2015] http://en.paper.edu.cn/en_releasepaper/content/4665176


	6. Research on Jointed Rock Masses Influenced by Fissure Water Presure
	LI Yong,ZHOU Hao,ZHU Weishen,LI Shucai,LIU Jian
	Civil and Architectural Engineering 23 November 2015
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	Abstract:Large numbers of cracks were included in rock masses. The initiation, extension, coalescence evolution behaviors of cracks in rock mass, and even fissure water pressure have significant impacts on the strength and stability of fractured rock mass in engineering projects. In this paper, we propose an elasto-brittle constitutive model considering fissure water pressure based on the computer code FLAC3D (Three dimensional Fast Lagrangian Analysis of Continua). This constitutive model is initially validated through a pre-cracked rock-like-material specimen in the laboratory experiments and then proved to actually simulate the initiation, extension and coalescence characteristics of cracks considering fissure water pressure in brittle fractured rock mass. It is concluded that fissure water pressure has obvious and significant effect on the strength and stability of fractured rock mass.
	TO cite this article:LI Yong,ZHOU Hao,ZHU Weishen, et al. Research on Jointed Rock Masses Influenced by Fissure Water Presure[OL].[23 November 2015] http://en.paper.edu.cn/en_releasepaper/content/4665179


	7. Mechanical Properties and Microstructure Characterization of Heavy Metal Contaminated Mine Soils Solidified by Cement and Phosphate-based Binder
	YANG Yuyou,WU Haoliang,DU Yanjun,YI Yucheng
	Civil and Architectural Engineering 16 November 2015
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	Abstract:Mine soil restoration is very important for ecological environment and residents life. This paper presents a study on mine soils, from the Baoshan, Hunan province, China, contaminated with heavy metals and stabilized by using a new phosphate-based binder (KMP) and ordinary portland cement (OPC). Aiming to explore the effects of binder type, binder content (%) and curing age of contaminated soils on environmental safety and strength properties of the soils contaminated with heavy metals in the mining area, toxicity characteristic leaching procedure (TCLP), acid-neutralizing capacity (ANC) test, sequential extraction procedure (BCR), unconfined compression test (UCT), X-ray diffraction (XRD) and scanning electron microscopic (SEM) procedures were carried out. Test results showed that as the curing age was increased from 0 d to 28 d, KMP and OPC stabilized contaminated soil underwent several changes: leaching of Zn and Pb gradually reduced, ANC (β) increased, exchangeable Zn and Pb decreased, residual contents increased and strength improved. When the binder content increases from 4% to 8% at the curing age of 28 d, the concentrations of leached Zn and Pb of KMP stabilized contaminated soil decreased by 64.2% and 60.05%, respectively; its ANC (β) increased by 2.97%; its residual Zn and Pb increased by 1.41 and 3.04 times, respectively; and its strength increased by 12.28%. Meanwhile, the concentrations of leached Zn and Pb of OPC stabilized contaminated soil decreased by 67.01% and 84.03%; its ANC (β) increased by 12.97%; its residual Zn and Pb increased by 1.84 and 1.25 times respectively and its strength increased by 24.05%. At the same curing conditions and binder content, KMP stabilized contaminated soil showed a lower leached Zn and Pb content than that by OPC, a higher ANC (β) by 1.65, more residual Zn and Pb by 41.5% and 89.01% respectively and an enhanced strength by 3.48-10.21%. (10 Points, Times New Roman)
	TO cite this article:YANG Yuyou,WU Haoliang,DU Yanjun, et al. Mechanical Properties and Microstructure Characterization of Heavy Metal Contaminated Mine Soils Solidified by Cement and Phosphate-based Binder[OL].[16 November 2015] http://en.paper.edu.cn/en_releasepaper/content/4662202


	8. Analytical behaviour of concrete-encased CFST columns under cyclic lateral loading
	Qian Wei-Wu,Li Wei,Han Lin-Hai,Zhao Xiao-Ling
	Civil and Architectural Engineering 04 April 2015
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	Abstract:The analytical behaviour of concrete-encased CFST (concrete-filled steel tube) columns under cyclic lateral loading is reported in this paper. A finite element analysis (FEA) model is developed to investigate the cyclic behaviour of such composite column. Comparisons are made between measured and predicted results on failure modes, load versus displacement relationships and ultimate strength. It is found that the proposed FEA model can reproduce the experimental results with a good accuracy. The full-range load-displacement relationships, the contact stress between steel tube and concrete and the axial load distribution among different components are analyzed using the verified FEA model. The cyclic behaviour of concrete-encased CFST is compared with that of conventional CFST and reinforced concrete (RC) columns. The parametric analysis is conducted to investigate influences of various parameters on moment-curvature (M-φ) envelope curves, including the material strength, steel ratio of inner CFST, longitudinal reinforcement ratio, stirrup characteristic value, tube diameter to cross-sectional width ratio (D/B) and axial load level. Finally, a hysteretic model for the M-φ relationship of concrete-encased CFST column is proposed.???
	TO cite this article:Qian Wei-Wu,Li Wei,Han Lin-Hai, et al. Analytical behaviour of concrete-encased CFST columns under cyclic lateral loading[J].


	9. EXPERIMENTAL STUDIES OF THE MECHANISM OF PARTICLE DAMPERS BASED ON A SDOF SYSTEM UNDER HARMONIC EXCITATION
	Yan Weiming,Wang Jin,Xu Weibing
	Civil and Architectural Engineering 04 February 2015
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	Abstract:Particle damping technology is a new vibration passive control approach. It has a lot of advantages, such as flexibility of layout, the distributed damping it provided, the notable effect of vibration absorption, even at a wide frequency bandwidth. Hence, it is widely researched in aeronautics and mechanical engineering, however, is still in the immature period in civil engineering. In this paper, the single degree of freedom (SDOF) steel frame was designed and manufactured, and was taken as a study project. Compared the response of the original structure and the structure attached with particles under harmonic excitation, the influence of the parameters on the effectiveness of the seismic control such as the filled mass of the particle, the size of the particle, the friction coefficient at the bottom of the container, the intensity and the frequency of the excitation have been researched. The results showed that, with the increase of the particle mass, the effectiveness of the seismic control increased at the beginning and then decreased; the smaller particle showed better effect than the bigger one; under harmonic excitation, the friction coefficient had little effect on the performance of particle damping. In this paper, with the increase of the excitation intensity, the performance maintained at a certain level at first and then became worse. When the frequency of the excitation was smaller, the response of the structure with particles was likely to be higher than the structure without particles, on the contrary, when the frequency of the excitation was larger than or equal to the natural frequency of the primary structure, the response of the structure decreased greatly. All of this indicated that particle damping technology had a good effect in reducing the vibration of single-degree freedom structure; it had a wide prospect in civil engineering.
	TO cite this article:Yan Weiming,Wang Jin,Xu Weibing. EXPERIMENTAL STUDIES OF THE MECHANISM OF PARTICLE DAMPERS BASED ON A SDOF SYSTEM UNDER HARMONIC EXCITATION[OL].[ 4 February 2015] http://en.paper.edu.cn/en_releasepaper/content/4631385


	10. MONTE CARLO SIMULATION WITH PIECEWISE RESPONSE SURFACE OF DEFLECTIONS OF REINFORCED CONCRETE BEAMS
	Tengfei XU
	Civil and Architectural Engineering 15 December 2014
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	Abstract:Based on the nonlinear Finite Element model with degenerated beam element, combing Monte Carlo method with piecewise response surface, a hybrid stochastic deflection method of reinforced concrete beam is developed to give consideration to efficiency and accuracy. Piecewise response surface are adopted to avoid the errors between a single response surface and real unsmooth response function, due to the cracking of concrete. Variability of deflection of a set of test beams is evaluated by present model. The results demonstrate the capacity of the present model in computing the stochastic deflection of nonlinear reinforced concrete beams.?????
	TO cite this article:Tengfei XU. MONTE CARLO SIMULATION WITH PIECEWISE RESPONSE SURFACE OF DEFLECTIONS OF REINFORCED CONCRETE BEAMS[OL].[15 December 2014] http://en.paper.edu.cn/en_releasepaper/content/4623190

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