Abstract : in this paper , based on a lot of testing and analyzing results at home and abroad , working principle and failure mechanism of concrete and reinforced concrete are put forward , strength theory - wedge cleaving theory of local pressure of concrete and reinforced concrete are set up , and calculation formula and simplified calculation method of local pressure strength are developed according to extreme balance principle 文摘:本文根据大量试验和国内外资料分析结果，提出混凝土及钢筋混凝土局部承压工作机理和破坏机构；建立混凝土及钢筋混凝土局部承压的强度理论? ?楔劈理论；并根据极限平衡原理导出局部承压理论承载力计算公式和实用计算方法。
Through a lot of test pile material , this essay concludes the vertical bearing capacity calculation formula of man - made pile with bulb shaped base by strength theory and relative deformation as control criterion . the method of defining pedestal pile foundation deformation modulus is especially discussed in this article , and it takes the mindlin solution as the starting point using mathematics method to get the poisson ' s ratio ( u ) which is the factor influencing foundation soil deformation modulus , and a deformation modulus calculating equation is finally determined 本文通过大量试桩资料和有限元计算分析，给出了以强度理论和相对变形为控制标准的人工挖孔扩底桩竖向承载力计算公式。其中特别论述了扩底桩地基变形模量的确定方法，并从mindlin解出发利用数学方法得出了影响地基土变形模量大小的因素?泊松比，初步确定了比较完善的变形模量计算公式。
In this paper , the strength theory is adopted to analyze the stress of the pressure component of boiler , and the calculation method of metal fatigue and creep is adopted to estimate the life loss of the boiler . meanwhile , the short - cut calculation method is put forward which can meet the requirement of on - line monitoring . on the basis of above , the on - line monitoring and management system of boiler life is developed 本文采用强度理论和疲劳、蠕变寿命计算方法，分别对电站锅炉的炉外、炉内主要承压部件进行了应力分析和寿命计算，并提出满足在线监测要求的简化计算方法，在此基础上，开发了锅炉承压部件的寿命在线监测和管理系统。
Simultaneity , through contrast analysis validate that antiseimic capacity of expansion web is better than that of steel web . therefore , based on the experiences summed up by precedence , the formulation for calculating the crack load and limit load of brick masonry house reinforced by expansion web is advanced , which provides project reference . based on the analysis and studies of masonry shearing strength , test of prestressed single brick masonry wall , and test of prestressed brick masonry house models , and ect , the article has carried through several aspect research as below : 1 . a series of experiment on material capability of expansion web , including intensity of single thread and expansion web , ect ; 2 . research on influence of loading and destroy of masonry brick building reinforced by expansion web under lowcyclic loading ; 3 . study of impact of expansion web on ductility , energy dissipation , intensity , ect under the same situation as above ; 4 . put forward computation formulation of masonry brick building reinforced by expansion web 本着以上的研究目的，本文在分析和借鉴前人砌体抗剪强度理论、预应力单片墙试验研究、预应力模型抗震性能试验研究等基础上，进行了以下几方面的研究工作: 1 .作为一种新型结构材料扩张网，进行了一系列的材性试验（单丝强度、网片强度和在砂浆中被约束条件下的网片强度及其相应的弹性模量） ； 2 .研究了水平荷载往复作用（低周交变）下，普通钢丝网和扩张网砂浆对砌体结构抗裂及承载能力和破坏形态的影响，并将这两种材料的加固效果进行了对比； 3 .上述状态下，两种网片水泥砂浆对砌体结构变形、延性、耗能、刚度退化等抗震性能的影响及其影响效果的比较； 4 .提出扩张网水泥砂浆加固砌体结构的抗剪强度计算建议公式。
The main innovations and contributions in the paper are as below : 1 ) the third and forth strengthen theories were analyzed and compared particularly . the reason that according extent of every theory was closed the fact to a extent was analyzed and discussed on theory integrally . the strengthen theories fitted to super - high pressure vessels was perfected further 本论文的主要创新点和贡献如下: 1 )对最大剪应力理论和最大应变能理论进行了详细的对比分析,对各理论与实际的符合程度的原因进行了较完整的理论定性分析论述,从而进一步完善了适合于超高压容器设计的强度理论。
On basis of ship strength theory , mathematical model and solvable method of limited deflections of ships are established , and deflection criterion to check the demands of longitudinal strength of intact ships or damaged ships is proposed . it is convenient for the preliminary ship design 根据船体梁强度理论，建立船舶极限挠度数学模型与求解方法，提出利用船舶挠度检验船体总纵强度的新方法，可以较方便地对正常或破损船舶总纵剩余强度进行检验，便于初步设计。
In this paper , torsional - flexural buckling of single - angle members is researched deeply and systematically by ultimate strength theory and general fem analysis software ansys , and is contrasted with some codes , as a result the simple and practical formulas for stability coefficient are recommended for design purpose 本文采用极限强度理论和通用有限元分析软件ansys ，系统深入地研究了单角钢轴心受压构件的弯扭失稳，并与多本规范进行了对比分析；在此基础上提出简单实用的稳定系数计算公式，以便工程设计参考。
According to unsaturated soil strength theory presented by fredlund , we have taken lead in establishing a formula of soil strength in beijing area ' s layers taking into consideration matric suction and the relationship between water content and matric suction . the change of water content is also a kind of disturbance from board angles 在国内，针对北京地区粉质砂土，根据fredlund提出的非饱和土强度理论，率先建立了考虑基质吸力影响的土的强度公式；吸力与含水量密切相关，从广义扰动角度来说，含水量的变化也是对土的扰动。
The aim of this paper is to relate structural inherent characteristic with exterior excitation , to wield experimental mode analysis technique and structure intension theory in order to separate structural leading mode under practical work state on base of spectrum analysis of exterior excitation and identification each rank mode parameter of structure . sequentially , the issue of space complex stress state in effect of static and dynamic coupling transforms into the issue of simple stress state ( under mode form ) in reciprocal effect of each rank mode in order to analyze structural dynamical intensity 将结构本身的固有特性和外部激励联系在一起，运用实验模态分析技术和结构强度理论，在对外部激励进行谱分析和识别出结构各阶模态参数的基础上，分离出实际工作状态下结构的主导模态，从而将一静动耦合力作用下的空间复杂应力状态问题转化为各阶模态相互作用下的简单应力状态(模态形态下)问题进行结构动强度分析。
In the theoretical description of grazing emission fluorescence , the mode of fluorescence intensity emitted from layered materials dependence of grazing angle is established by applying asymptotic approximations to double fourier integrals , and the theoretic calculation formula of fluorescence intensity from a thin layer is derived . by the derived expressions , the theoretic simulation curves of several thin layers on si substrate are calculated . in the experimental setup , the requirement of construction of the setup and some important parameters are brought forward 最后，利用平稳位相方法建立了掠出射情况下薄层样品产生的荧光强度和掠出射角的对应关系数学模型，推导了薄层样品荧光强度理论计算公式，并以此为依据模拟计算得出了cr 、 fe 、 ti和ni等几种以si作基底的单层薄膜样品的荧光强度随掠出射角变化的理论曲线。
