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Control of a Spring Pendulum with Single-Frequency Excitation Han Xiao1,a Jia-shi Tang2,b Wei Yan1,c 1Faculty of Architectural Civil Engineering and Environment, Ningbo University, Ningbo 315211 China 2College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082 China 3Faculty of Architectural Civil Engineering and Environment, Ningbo University, Ningbo 315211 China axiaohan@nbu.edu.cn, btangjiashi@hnu.cn, cyanwei@nbu.edu.cn Keywords: Excitation, Spring Pendulum, Saddle-node Bifurcation, Amplitude, Feedback control.
Due to some nonlinear factors, saddle-node bifurcation occurs in certain engineering projects, which would leads to appearance of kinetic behavior that brings great hazard to structures [4,5].
Research on saddle-node bifurcation, especially on control of saddle-node bifurcation, is of great importance in related nonlinearity fields, and also a push to practical engineering.

Multiple Stepwise Regression Analysis Crack Open Degree Data in Gravity Dam Weiwen Shen1, a *, Jianmin Ren2,b 1 School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou, China 2 School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou, China a1106550209@qq.com, brjmin4148@sina.com Keywords: Gravity dam; Crack open degree; Multiple Stepwise Regression Analysis Abstract.
However, there may not be thermometer (as used here in engineering examples).
Fig.1 Regression standardized residuals histogram Fig.2 Actual and predicted values ​​comparison Conclusion This research took the Yellow River Water Conservancy pier a crack observation data as an engineering example.
Domestic and foreign water conservancy and hydropower engineering Concrete Crack and Prevention Research[C].

Numerical Analysis of the 2-Dimensional Diffusion Models of Chloride Ions Based on the FDM with Alternating Direction Implicit Schemes Hou Fei1, a*, Bai Yu 1, b and Dong Jun1, c 1 Beijing Research Center for Engineering Structures and New Materials, Beijing University of Civil Engineering and Architecture, Beijing, 100044, P.R.China ahoufeiben@163.com, bbaiyu@bucea.edu.cn, cjdongcg@bucea.edu.cn * corresponding author Keywords: Diffuse Equations, Coefficient of Diffusion, Temperature, Actual Conditions Abstract.
Therefore, since the advent of Portland cement, Reinforced concrete structure which has been the preferred form of engineering structure design is widely used in civil, water conservancy, ports, Bridges, and other fields.
Two-dimensional concrete chloride ion diffusion model and engineering verification[J], Hydraulic Engineering.2009（6），35-39，Chong Qing [2] DaiWeizhong.

Creep Prediction Model for Concrete Made of Crushed Clay Bricks as Coarse Aggregate Syed Ishtiaq Ahmad1, a and Sushanta Roy1, b 1Department of Civil Engineering, Bangladesh University of Engineering and Technology, Dhaka 1000, Bangladesh asiahmad@ce.buet.ac.bd, bsushanta@mcsconsultancy.com Keywords: Brick, Aggregate, Creep, Time Dependence, Prediction Models Abstract.
Therefore, an appropriate creep prediction model for concrete made of crushed clay bricks as coarse aggregate will be helpful for both design engineers and researcher engaging concrete made of crushed clay bricks as coarse aggregate.
To achieve this, a creep testing scheme is first carried out at Bangladesh University of Engineering and Technology, Dhaka for concrete made of crushed clay bricks as coarse aggregate having strength in the range of 18.9 up to 24.0 N/mm2.
Roy: Creep Behavior and its Prediction for Normal Strength Concrete made of Crushed Clay Bricks as Coarse Aggregate, J. of Mate. in Civil Eng., ASCE, Vol.24(3), pp.308-314
Ross: Shape, Size and Shrinkage, Concrete and Constructional Engineering, pp.193-199 (London, 1944).

Based on the minimal stress method for the determination of the reasonable completed bridge cable force Shaoxia Gao1, a, Baochu Yu1,b, Chao Gao1,c zhen zhen wang1,d 1Dept. of Ocean and Civil Engineering, Dalian Ocean University, Dalian, Liaoning, 116023, China aGsx685@163.com, bbaochuyu@dlou.edu.cn, cgc@dlou.edu.cn, dzhen zhen wang@dlou.edu.cn Key Words:cable-stayed bridg,cable force optimization of the completed bridge,the minimal stress method with constrains Abstract.
Reasonable bridge state is a state that through the cable force adjustment, the structure meet the minimum stress under the requirements of premise ,and each section needs the leatest prestressed rebar ,in other words in this state engineering materials reach the leatest amount and the project cost minimum[1].
Therefore, with using the universal finite element program MIDAS/CIVIL,we build the spatial FEM model, which is composed by several plane bar units that integrated and connected by joints[5].
On the other hand, this method give the result that the tensile stress appears small on the cross section,this can reduce the number of the prestressed steel,and then reduced the total engineering cost.Therefore, the cable force optimization method which was used in this article was feasible, reasonable and has higher engineering application value.
References [1] GengdongCHENG.Engineering structure optimization design basis .Beijing: Water conservancy electronic publishing department,1983

Damage Identification for Truss Structures Using Eigenvectors Weimin Jina, Qiuwei Yangb, Xue Shenc, Fangjun Lud Department of Civil Engineering, Shaoxing University, Shaoxing, 312000, China ajwm6401@sohu. com, byqwqaz@yahoo.com.cn, c 674987264@qq.com, d398959702@qq.com Keywords: damage identification; truss structures; generalized energy; eigenvector sensitivity.
Introduction Structural damage detection using measured dynamic data has emerged as a new research area in civil, mechanical and aerospace engineering communities in recent years[1-5].
Communications in Numerical Methods in Engineering, Vol. 25 (2009), p.381-389
Engineering Structures, Vol. 29 (2007), p.519-528
International Journal for Numerical Methods in Engineering, Vol. 78 (2009), p.444-459

Long time testing of temperature parameters in selected windows Ďurica Pavol1, a *, Ďuriníková Mária2,b, Rybárik Ján3,c , Štaffenová Daniela4,d 1,2,3,4 University of Žilina, Faculty of Civil Engineering, Department of Building Engineering and Urban Planning, Univerzitná 8215/1, 010 26 Žilina a pavol.durica@fstav.uniza.sk, b maria.durinikova@fstav.uniza.sk, c jan.rybarik@fstav.uniza.sk, d daniela.staffenova@fstav.uniza.sk Keywords: long time testing measurements, wooden and plastic windows, minimal surface temperature, condensation of water vapor Abstract.
Introduction The window constructions evaluated in this article are built in the testing laboratory of the Department of Building Engineering and Urban Planning, Faculty of Civil Engineering, University of Žilina.
Fig.1 Window constructions built in the climatic chamber of pavilion type Climatic chamber description The climatic chamber is situated on the second floor of the Laboratory center of Department of Building Engineering and Urban Planning.

The results had been validated in practical engineering.
Geology of typical regional Engineering geology.
Civil soda was used to take place of sodium carbonate.
Validation of engineering quality.
Deterioration of Laterite Engineering by Chloride Ion[J].

URBAN-INCERC, Timișoara Branch, 2 Traian Lalescu Street, RO 300223, Timișoara Romania 2“Politehnica” University of Timișoara, Faculty of Management in Production and Transportation, Remus, no. 14, RO 300191, Timișoara, România 3“Politehnica” University of Timișoara, Faculty of Civil Engineering, Traian Lalescu, no. 2, RO 300223, Timișoara, România 4N.I.R.D.
Li, Engineered Cementitious Composites (ECC) Material, Structural, and Durability Performance Concrete, Concrete Construction Engineering Handbook, Chapter 24, Ed.
Baeră, Self-Healing capacity of Advanced Engineered Cementitious Composites, PhD.
Lăzărescu, Engineered Cementitious Composites (ECCs): evaluation of direct field of application in romanian present infrastructure (road and civil), Constructii, 19(1/2), (2018) 11-18 [29] A.C.
In IOP Conference Series: Materials Science and Engineering 877(1) (2020) 012028 [33] A.S.

THE MECHANICAL PROPERTIES THAT NANO-SIO2 AFFECT EPS LIGHT-AGGREGATE CONCRETE CUI Jian1,a 1Jilin Architectural and Civil Engineering Institute, Changchun 130118) acuijian100@sina.com Keywords: nano-SiO2; EPS light-aggregate concrete; mechanical properties Abstract.
EPS light-aggregate concrete is a new kind of light aggregate concrete and is paid more attention by engineers in the field for superior thermal technology performance and prominent economic benefits, in which the Nano-SiO2 can not only fill the lacuna of concrete to improve the performance of concrete but also can improve the mechanics performance and the strength of concrete obviously.
It is very significant to research the effect of nano-materials on EPS light-aggregate concrete performance, and its application in construction industry will bring great value to practical engineering and social economic benefits to our society.
Foundation item: The Jilin province science and technology development project scientific research fund for young (201201103) and The Jilin Institute of Architecture and Civil Engineering research fund for young (J20091101) Reference: [1] V.Ducman,A.Mladenovic, J.S.Suput, Lightweight Aggregate Based on Waste Glass and Its Alkalisia Reactivity[J], Cement and Concrete Research, 2002, 14(2): 116-121