Local buckling capacity of steel composite beam subjected to combined bending , shear and patch loading is one of key problem in steel structures design . the computational formula for local stability of web was based on the assumption of infinite - elastic perfect plates in the steel structures design code ( gbj17 - 88 ) . but in the revised code ( gb50017 - 2003 ) , this formula was made big change with reference to british code ( bs5950 , partl ) and australian code ( as4100 ) , the related research result of our country was included as well . in the modified formula , influence of early geometric imperfection and elastic - plastic buckling stage were considered , which is compatible with both actual circumstance of engineering and the strength formula of beams under bending stresses ( considering partial plasticity of the section ) . in this paper , the preceding problem is deeply analyzed and studied , considering the effects of various geometric parameters and stress combinations on buckling critical stress of web , the revised local buckling correlative formula for transverse and longituded stiffened web panels under combined stresses is analyzed and verified by finite element method 组合钢梁腹板在弯、剪及局压复合应力作用下的局部屈曲承载能力是钢结构设计中需考虑的问题，新的《钢结构设计规范》 ( gb50017 ? 2003 )对此部分内容作了较大改动，原规范中关于腹板局部稳定的计算公式是基于无限弹性的完善板假定；新的规范则参考了英国规范( bs5950 part1 )及澳大利亚规范( as4100 )并结合我国相关研究成果，考虑了屈曲进入弹塑性阶段以及初始几何缺陷的影响。这不仅与工程实际情况相符，而且也与钢梁在弯曲应力作用下允许截面部分进入塑性的计算公式相协调。
When the elastic design method is used , the paper proposes the recommendation that designer can not consider second - order effect on structural internal force , but must consider the effect on drift computing , and also gives a simplification method for calculating the second - order drift . base on above research achievements and referencing current design codes and research documents , this text has done overall discussions on the elastic design method , the chief works includin 基于前面的研究成果，参考现有各国钢结构设计规范和已有的研究文献，本文首次对钢结构错列析架体系的弹性设计方法作了全面的探讨，主要工作包括材料的选用、构件截面形式、构件弹性设计方法、连接节点设计和构造详图、组合楼盖的设计、栓钉剪力连接件的设计。
Code for design of steel structure gb50017 - 2003 , the being employed code in china , has codified the basic theory about second - order analysis , but there is no criteria about second - order drift , and the drift limits in the code can be only used in first - order lateral displacements analysis . therefore , it is urgently that researches are needed on second - order drift analysis and on how to establish the new limits for second - order drift . it ’ s a practical problem that researching how to establish second - order drift limits , and some conditions relative practical engineering are required to be taken into account 我国现行规范《钢结构设计规范》 ( gb50017 - 2003 )已经将二阶分析的原理列入其中,但规范中尚未涉及二阶侧移计算的有关内容,规范中规定的侧移限值也仅限于对一阶侧移的约束,这就迫切需要对二阶侧移计算方法进行研究,以及确立考虑二阶效应后钢框架结构的侧移限值。
The bearing capacity of normal section of the composite panels may be calculated according to the assumed limit state based on the modified normal sections while the deformation of the composite panels may be corrected according to the calculations made in line with the prevailing steel structure design codes and by taking into consideration the influence of the interfacial slipping motions 组合板的正截面承载力可按基于修正平截面假定的极限状态计算；组合板的变形，可在按现行钢结构设计规范计算的基础上，加上考虑界面滑移影响的附加变形值予以修正。
In the actual ( ( code for steel structure design } ) ( gbj 17 - 88 ) and for the ( ( technical specification for steel structure of light - weight buildings with gabled frames ) ) ( cecs 102 : 98 ) , the calculation method for the stability of the members is : obtaining the axial force through the analysis of the linear - elastic inner force of the whole structrue , then checking the stability inside and outside the plane respectively on the foundation of the yielding rule of the edge 我国现行《钢结构设计规范》 ( gbj17 - 88 )和《门式刚架轻型房屋钢结构技术规程》 ( cecs102 : 98 )对构件的稳定计算方法是：先对构件进行整体线弹性内力分析，得到构件的轴力和弯矩；再根据边缘屈服准则对构件分别进行平面内和平面外稳定验算。
On the basis of calculation results , the paper still analyzed several defects about end - plate connection calculation model existing in our country ' s current design criteria , furthermore , it proposed so me improvements about end - plate connection calculation model according to bolt force distribution 在计算分析的基础上，本文还分析了我国现行钢结构设计规范在端板连接受力计算模型方面存在的不足，并根据节点受力分析得到的螺栓拉力分布规律，提出了节点计算模型的改进意见。
