Comparative Study On Design Specification Of Steel Structure Between China And Europe

Specification is the core of engineering design,studying and mastering the foreign standards as a system is the key step to the overseas market for enterprise,but also the key of enhancing the international competitiveness.At the same time,for the revision and perfection of the current specification,we must absorb the advanced experience of the international standard.Eurocode is a standard of building and civil engineering design for construction,which is composed by the European Standardization Committee.Eurocode is the crystallization of experience and research of the member states of the European Union,and on behalf of the structure design of world-class standards.In this paper,by the study of steel structure design code of Europe,EN1993,combined with the steel structure design code in China,the difference between these codes in steel structure material,design principles,design theory,design method,design parameters were carried on the contrast analysis.the main research contents of this paper are as follows:(1)Comprehensive interpretation and translation of structure design code of Europe were carried out,then we study the Eurocode as a system and research to clarify the reference relationship between various special specifications(2)Probability-based limit state design method and design method of multiple partial coefficient were both carried by Chinese code and Eurocode.EN1993 uses half a probability limit method,but in China there are different codes of different partments,for example,in railway bridge girder steel structure design codes there are large numbers of safety coefficient method,however,in Steel structure design specification,full probability limit method,probability limit method and safety coefficient method are coexistence.Structural safety level is divided in three levels based on damage severity consequences,the difference is that the Eurocode at the same time give the concept of the reliability level,and clear that reliability level and safety level are not the same concept,only when both associated,they have the same meaning.(3)Based on the constitutive relation of steel structure,the differences of the mechanical properties of the steel are compared,including the constitutive relation curve,the classification of steel,and the other requirement of steel.There are 5 stress-strain curves in the Eurocode,while the deformation of the strain hardening and tensile yield stress of the material is considered.The strength of the jionts in eurocode are all bigger than that in Chinese code.For other material requires of properties in Chinese,they rules and regulations more detailed,more in line with the production practice in our country,such as in steel ductility requirements we take considering of the strain of steel structure,in characteristic thickness we specified sulfur limits.With the improvement of the level of steel production in our country,the European standard has a big value of reference.(4)We study the aspects of structural modeling and second-order effect.In eurocode structural analysis we can use elastic analysis,elastic-plastic analysis,plastic analysis,and in Chinese code mainly use elastic analysis.In the same framework,Chinese and European code are almost both consider second-order effect or not.Calculation of the second-order effect,the Chinese code and Eurocode both use the method of enlarging bending moment to calculate,however,in addition to the structure of the Eurocode they take the p-? effect into considering,but also the p-? effect,the Eurocode bending moment is larger than the Chinese specification by 5%~10%.(5)Structural seismic.Eurocode use 2 fortification level to design,roughly equivalent to small earthquakes and middle earthquake of the three level in our specification;response spectrum are both divided into four stages and have similar shape;earthquake action calculation method in Chinese code and Eurocode are the bottom shear method and mode decomposition response spectrum method,the Chinese code also provides the time history analysis method,considering the torsion of the structure;Chinese code use additional concentrated seismic force on vertex to calculate,and the reduction factor is introduced,while Eurocode is not.The bottom shear method Chinese code to calculate earthquake effect and interlayer shear force is bigger than the European standard.(6)The stability of the structure,both Chinese code and Eurocode are use Compressive bar stability theory and stability theory of sheet to design.The Eurocode considers composition section boundary constraints of clamp,ratio of width to thickness,yield strength of steel and the stress distribution in order to divided sections of steel members into four categories;according to the experimental data and mathematical deduction,and considering geometric defects and residual stress components,Chinese code and Eurocode provides more stability coefficient curve.The overall stability analysis: compression member calculation,Eurocode divides sections of members into four categories,and influence of effective section area are considered,calculation results are not significant between Chinese code and Eurocode;bending calculation,are divided into and out of plane to design respectively in both codes,the stability coefficient of China is greater;Calculation of bending member,for the section modulus and the compressive strength design value of steel are different,integral stability coefficient in eurocode is less than that of Chinese code.Under lateral loads,the overall stability of the eurocode cross-section rolling bears capacity of 2%~7% more than that of ours,with end bending moments,welded cross section is smaller than that of our code by 24%~32%.When the the bending moment of the element end works,in the Eurocode the overall stability of the carrying capacity is smaller than ours by 9%~26%.Local stability,the limit values of flange width thickness ratio we didn't consider the distribution of stress distribution,high thickness ratio of the web thickness in the Chinese code take difference between the maximum and the minimum stress into considering,while the Eurocode consider the stress distribution;example shows that,in same steel strength,the limit value of the flange width thickness ratio of the Eurocode axial compression member is smaller than that of Chinese,bending and compression members,with the end compression zone and tensile area increased,the flange width thickness ratio limit of the Eurocode is greater in the first,then smaller than the code of Chinese.(7)The classification,calculation method for the design of resistance theory,connection failure mechanism was analyzed.Chinese code and Eurocode have a different classification in bolts,according to the damage form of bolt stress state and limit state,the bolt joints are classified in eurocode.According to the strength of the material specifications of steel structures in our country divides bolt connections into ordinary bolt connection and high strength bolt connection,according to force high strength bolt connection is divided into two kinds,friction type and bearing type.In calculation of resistance,in Chinese code and Eurocode there are differences in understanding of the destruction,Eurocode make the sheet support wall damage equal to the bolt connection failure,criterion of our country takes the small value of the shear and anti-support pressure.In the calculation of the load carrying capacity of the combination of tension and shear,Eurocode use the linear equation,and the standard of our country is quadratic equation.