Abstract:This paper makes an analysis and comparison of the calculatingsystem for second-order effect in columns of reinforced concrete frames proposedby scholars at home and abroad,and the systems adopted by codes of manycountries.The focus is on explaining the conceptual error and deficiency in somemethods.After expounding the basic law of the second-order effect in framecolumns with different restraints,this paper suggests an improvement of thecalculating system for second-order effect in frame columns for China's DesignCode of Concrete Structures.

Abstract:本文综合指定杆长求极限承载力和确定轴向压力求构件极限承载长度这两种计算方法的优点,采用逆算单元长度法计算构件长度,通过轴力增量和端转角增量的交互控制,考虑初弯曲的影响,从而提出了一种在不等端弯矩作用下,计算速度和精度均较满意的压弯构件面内失稳极限承载力计算方法,并用之于计算双角钢截面压弯构件的极限承载力.根据所得的N/N_P-M/M_P相关曲线,验证了钢结构规范中有关规定,提出了相应的面内失稳验算式,供修订钢结构规范参考.

Abstract:本文研究了两种形式的18米跨度R,C,屋架和双跨四层刚架的前五个振动周期及相应的振型曲线,以及鞭梢效应对刚架的影响.

Abstract:本文对变量泵驱动的液压挖掘机转台回转速度图和运动规律进行了分析,导出了转台最佳转速和相应的回转循环时间的计算式,提出了双梯形速度图的判据和转台最大转速临界值的计算式,并有实例进行比较.

Abstract:By means of the method of integral equation of ring shells ininitial parameter form,the problems of S-type corrugated tubes are studied inthis paper.Two calculating examples are given,and compared with the exactsolutions.

Abstract:本文考虑了板中面的应变效应,将加肋板的内力化为作用于中面上的薄膜内力及弯曲内力,并用板中面的三个位移分量来表示这些内力.导出了关于位移分量的三个基本微分方程式,并将其化为一个仅含挠度的八阶微分方程及两个求板中面位移的积分式。文中分析了解的形式,导出了肋端简支单向加肋矩形板,具有弱抗扭开口肋时的全部位移及内力式,并给出了数值算例.

Abstract:The building cold and hot loads calculation method for design-ers is spread and used in our country.There are total 301 kinds of commonwalls and roofs,which are classified as 6 types respectively.The cold loadtemperature tables are compiled for designers.With the development of build-ing science,there will be many new types of wall construction without classi-fication.This is inconvenient for fhis new calculation method to be spread.Inthis paper,a new method of wall classification is developed according to theprinciple of fuzzy colony discernment.We have got satisfactory result in com-parison with the result gained by load calculation method.This method invo-lves only algebra calculation and comparison calculation,such as taking bigger,taking smaller etc.,so it is simple and easy for designers to use.

Abstract:In this paper,the theological model is presented,and the ba-sic principle of the viscoelastoplastic problem is worked out by the boundaryelement direct method,and the relevent formulations are derived.Several exam-ples show that the theological model and the corresponding boundary elementmethod presented in this paper are effective and reasonable.

Abstract:In this paper,a computer program for nonlinear analysis ofa special frame is developed.The frame has all columns fixed at the base and hinged at the top.By taking the frame as a whole,the behavior ofthe frame is studied from the test results of three specimens of the frame andlarge amount of results of computer program.The minimun value of total sumof vertical loads sustained by the frame is found and a new method of deter-mining the effective length of stepped columns is suggested.

Abstract:Generalized convex function is a generalization of convex func-tion,including pseudoconvex function,quasiconvex function,r-convex function,etc.The properties and operation properties of generalized convex functionplay an imporant role in generalized convex programming.Xue Jiasheng discu-sed the constructive method of pseudoconvex function;J.P.Crouzeix dicussedthe properties of quasiconvex function.This paper only discusses a class ofgeneralized convex function,r-convex functions.

Abstract:In ombination with the reconstruction of the old Wanglongmenin Cnongqing,the authors attempt to present the problem of fire control indesign of high-density and high-rise block of flats,with respect to generalplan,architectural design,equipments and the use of natural resources in mo-untainous region.It also has widespread significance in exploring the way toreconstruct old city in mountainous region.

Abstract:According to the charactor of the tonw-system layout in moun-tainous area,this paper analyses current situations and existing problems ontown-system in Leshan region,combining with the practice of the town-system planning in this region.This paper also studies how to make the town-system in the region rational layout in the light of the economic andsocial development tendency in the end of the 20th century and the beginningof the 21st century.

Abstract:This paper presents that the closure function of convex func-tion in Hilbert space is definied by affine function approximation.On the ba-sis of closure function of convex function,closure function of nonconvex func-tion is introduced by concept of convex hull function.Some properties ofclosure function of convex function and nonconvex function are discussed.

Abstract:在序拓扑向量空间中,已有许多著者对有效解的性质作了研究.在实数空间中M.Avriel和I.Zang提出了广义弧凸映射的概念.本文在抽象空间中研究了广义弧凸映射和有效解的Kuhn-Tucker条件,二阶条件以及局部-整体有效解之间的关系.