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. , Beijing 100120, China 2School of Civil Engineering, Tsinghua University, Beijing 100084, China 3School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China 4School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China acapdi.gssd@vip.163.com, bdaerduo0106@163.com, cpangyutao@126.com Keywords: long-span floor structure; structural comfort; human movement load Abstract: The structural comfort of long-span floor structure which setup stadium is studied in this paper.
The results show the vertical acceleration and natural frequency of structure are decreased approximate linearly with increasing of the slab thickness; take one engineering project for example, according to the method proposed in this paper, the different structural comfort control index should be adopted in sports field and audience stand, respectively.
Two contents about structural comfort indices are analyzed in this paper: (1) analyzing the influence parameters of comfort; (2) verifying the comfort of engineering project discussed in this paper.
In this paper case engineering, the thickness designed according to bearing capacity and stiffness can satisfy the conventional stadium load comfort demand
Take the specific engineering for example, the analysis showed that the comfort level of the engineering accorded with existing standard regulations

Energy Principle in Crack Propagation SONG Haiyan1, a, FAN Tao1, b 1 College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, China a shyivg@yahoo.com.cn, b fantao19812005@ yahoo.com.cn Keywords: energy release rate, crack propagation, energy functional, DCB speciment Abstract.
Fracture mechanics is an engineering discipline, which originated from Griffith energy-balance concept.
Introduction Fracture mechanics is an engineering discipline.
Although it is seldom made on a rigorous basis, the commonly used assumption that dynamic effects can be neglected in the arrest of rapid crack propagation in engineering structures is probably a reasonable one in most instances.

Design on a Total Precast Concrete parking Structures FAN Xin-hai1,a,MA Rong-quan1,b ,LIU Ming2,c 1 Technology Center,China Construction Eighth Engineering Division,Shanghai 200120,China 2 School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, China aemail:fanxinhai521@163.com,bemail: mrq68@163.com,cemail:liumingsy2008@163.com Keywords: precast parking structure; double tee floor; connections; precast shear wall.
The construction noise and wasted material of total precast concrete structure are reduced by factory production of components and assembled construction, green construction can be achieved．Combined with the first total precast parking structure in China, the connection modes of precast components are introduced，such as between precast columns and precast columns, between precast columns and precast inverted beams, between precast double tee slabs and precast columns or precast shear wall, which can provide a reference for the design of similar engineering.
JOURNAL OF STRUCTURAL ENGINEERING, 2013.139:15-27 [4] Effect of Spandrel Beam to Double Tee Connection Characteristic on Flexure-Controlled Precast Diaphragms.
JOURNAL OF STRUCTURAL ENGINEERING, 2012.138:247-257.

The influence of alloy elements on Mg-Al alloy and its development Prospect Jie Yan 1, a, Jun Xie 1,b, Jingshun Yuan1, c, Jingyu Zhang2,d, Tao Guo1, e 1 Hebei Institute of Architecture and Civil Engineering, Zhangjiakou, Hebei, 075000, China 2Petrochina Jilin Petrochemical Company Ethylene Glycol Factory, Jilin, Jilin, 132021, China ayanjie6253@126.com, bxiejun79@126.com, c840303919@qq.com, dhongseguoji@sina.Com, egtyuanyuan@sina.com Keywords: Mg-Al alloy; alloy element; development prospect; Domestic Research of Mg-Al alloy Abstract.
So Mg-Al alloy has wide application prospect in automobile, electron, elctrical equipment, transportation, avitation, national defense and military, known as the " twenty-first Century green engineering materials ".
So Mg-Al alloy has wide application prospect in automobile, electron, elctrical equipment, transportation, avitation, national defenseing and military, known as the " twenty-first Century green engineering materials ".
After the end of World War II, Mg-Al alloy began the development and application of in civil industry. 1936 Volkswagen "beetle" series began in the automobile crankcase engine transmission system parts, use a lot of Mg-Al alloy,it has been up to 18kg Mg alloy in "Beatles" cycling in 1946 Mg alloy g, and start setting off "magnesium era" .
The 21st century green engineering materials—Mgalloy.

Research on Influencing Factors of Drainage Performance in Engineering Xushu Sun1,2, a, Jianlin Li2,b, Xiaoliang Xu2,c, Jianrong Li2,d, Fei Liu3,e 1 College of Water Resources and Hydroelectric Engineering, Wuhan University, Wuhan, Hubei 430072, China 2College of Civil Engineering and Architecture, China Three Gorges University, Yichang, Hubei 443002, China 3Yumen Oil Field Hydroelectric Power Plant Electric Power Hydraulic Eng.
The study is useful for drainage design and construction in engineering.
[In Chinese] [4] Bin Li, Junxia Zhang: Journal of Hydraulic Engineering, (1996), p. 51-56.
[In Chinese] [7] Yueming Zhu, Liaojun Zhang: Chinese Journal of Geotechnical Engineering, Vol. 19(1997), p. 69-76.
[In Chinese] [8] Jianyu Chen: Chinese Journal of Rock Mechanics and Engineering, Vol. 23(2004), p. 2027-2031.

Effects of transverse prestressed tendons (TPTS) on the mechanical performance of hollow slab bridge Liang Dong1, 2, a, Li Pengfei1, b 1School of Civil Engineering, Hebei University of Technology, Tianjin, 300401, China 2Civil Engineering Technology Research Center of Hebei Province, Tianjin, 300401, China aldhebut@gmail.com, b 514343083@qq.com Keywords: bridge engineering, hollow slab bridge, transverse prestressed tendons, mechanical performance, 3D FEM model Abstract.

Estimation of Scale of Fluctuation of Soil Properties Indexes YAN Shuwang1,a, GUO Linping2,b 1,2School of Civil Engineering, Tianjin University, Tianjin, China ayanshuwang@tju.edu.cn, bguolinping1986@163.com Keywords: random field, scale of fluctuation, sampling distance, Bayes Theory Abstract: By summarizing and comparison of methods for evaluating the scale of fluctuation, suitable and convenient method to calculate correlation distance is obtained.
The space averaged method is employed to analyze the scale of fluctuation of soil in the vertical direction of Tianjin combining geology data, and regional representative values are obtained, which is of high application value on risk assessment and reliability analysis in geotechnical engineering.
While engineering characteristics of soil depends not on properties of some points but on space average properties.
(3) Bayes theory provides an approach to employ existing similar engineering experience, which is of highly importance to summarize regional data of correlation distance.
Journal of the Geotechnical Engineering Division,ASCE,1977,103(GT11):1227 -1246

Jilin university mechanical science and engineering college 2.
Changchun mechanical science research institute co., LTD a435562852@qq.com Key words: Stiffness Fatigue; Testing Machine, The Mechanical Model Abstract: Aiming at the problem that complex systems mechanical model is difficult to set up and analyze accurately, a certain type of electromagnetic high frequency fatigue tester as engineering background, setting up its mechanical model and carrying on the reasonable simplified.
Hydromechatronics Engineering, 2004,7(45):78-81
Engineering Vibration Foundation[M].
Journal of Shenyang Architectural and Civil Engineering Institute, 2002,34(04):38-42

Soil stabilization is the alteration of one or more geotechnical properties to create an improved soil material possessing the desired engineering properties.
Soil stabilization can be explained as the alteration of the soil properties by chemical or physical means in order to enhance the engineering quality of the soil [1].
Numerous kinds of stabilizer were used as soil stabilizers were used as soil additives to improve its engineering properties.
Obienusi, Evaluating the causes of the road failure of Onitsha_enugu Expressway, Southeastern Nigeria, Civil and Eng.
(2016) [22] Usman, N., Masirin, M.I.M., Ahmad, K.A., Ali, A.s.B.: Application of Recycled polyethylene terephthalate fiber in Asphaltic mix for fatigue life improvement: Lecture Notes in Civil Engineering: (2019)

Therefore, it has important engineering significance in guiding structural design.
Load case 2 According to engineering practice, we reconsidered the diffusion effect of A380F aircraft wheel load.
Those conclusions will have a good reference on engineering design.
[2] Qiu Dong-shun, Frequently Asked Questions on Midas Civil the Software Solution in Bridge Engineering.