内力

Applying theories of Vector geometry and differential calculus, this paper aims to infer the internal force and geometry equations for curved beam, whose axis curve is parabola and being distributing-load.

目的 对形心轴线为二次抛物线形曲线梁的内力、几何方程进行理论分析与公式推导。

The analysis considering temporary supports indicates that the real response of structure can be shown more veraciously . Besides , the amplitude of force for some particular component varies a lot , and it's indispensable to check the intensity and stiffness of structure in construction .

研究表明：考虑临时支撑对弦支穹顶结构的影响可以更贴切地体现结构施工过程中的实际响应，随着预应力张拉的进行，个别构件内力变化幅度非常大，对结构进行施工阶段的强度，刚度等验算显得尤为重要。

The analysis considering temporary supports indicates that the real response of structure can be shown more veraciously. Because of the temporary supports' effects, the components' internal forces and displacements of non-supports structure are different from the ones of structure considering supports. Besides, the amplitude of force for some particular component varies a lot, and it's indispensable to check the intensity and stiffness of structure in construction.

研究表明：考虑临时支撑对弦支穹顶结构的影响可以更贴切地体现结构施工过程中的实际响应，随着预应力张拉的进行，个别构件内力变化幅度非常大，对结构进行施工阶段的强度、刚度等验算显得尤为重要。

Also, the conversion between counteracting force and deflection of the bridge is achieved. The study analyzes on the characteristics of the beams" stress and deformation and gets the beams" vertical fiexture stress and deflection, their rigidity rotation stress and lateral inner force caused by the beams distribution of load.

通过实测结果，得到了桥梁的支反力与挠度，箱梁桥的受力特点：包括纵向弯曲产生的竖向变位，畸变角及由畸变产生的隔板横向弯曲应力，纵向弯曲应力及箱形梁的剪力滞现象及影响因素，箱梁桥刚性转动效应和截面的歪扭情况，箱形梁在局部荷载作用的横向内力，桥面板的有效工作宽度，荷载的横向分配分析。

In this paper, a finite element model for the analysis of the pipeline suspension bridge was set up with considering the initial internal force and verticality of the staying cable.

本文建立了悬索管桥分析的有限元模型，并考虑了悬索管桥恒载产生的初始内力、拉索垂度等几何非线性因素。

3 The difficulties if the curriculum: internal force calculation of combined structures; virtual work principle and displacement calculation ; displacement method; analysis of structural matrix analysis; dynamic calculation.

本课程难点：静定组合结构的内力计算，虚功原理和结构位移计算，力法，位移法，结构矩阵分析，结构的动力计算。

Continuum topology optimization method for arch axis design of arciform aqueducts;2. The effects of deformation and internal forces produced by transverse bias of arch axis are analyzed by simulative computing.

针对某上承式钢筋砼箱板拱桥建成后的拱轴线与设计拱轴线发生横桥向偏离，通过计算仿真分析探讨拱轴线偏离对主拱内力和变形的影响，提出了几种改善主拱受力状态的措施，为同类拱桥的施工偏差和加固维修提供借鉴。

However, in designing the beamless slabs with equivalent frame method, the stress is an average values along the depth of section, which varies with the normal service state. Compared with the results by finite element method, the results gained by equivalent frame method cannot satisfy the requirement under the normal service state. Therefore, the tendons of beamless slabs should be designed and arranged based on the results of FEM taking account into vertical load and prestressed load.

本文通过分析，认为采用等代框架法进行无梁板设计时，其内力是基于截面平均的结果，在正常使用状态与实际受力状态有很大的不同，通过对比等代框架法和有限元计算的正常使用极限状态应力可知，按等代框架法设计的预应力布置并不能保证其正常使用极限状态的要求，据此提出了应根据无梁板在竖向荷载和预应力共同作用下弹性有限元分析结果进行预应力筋布置的建议。

2The static behavior of one prestressed spatial truss string structure is analyzed systematically in this paper. The change of the structural internal forces and displacements with the rise-to-span ratio, sag ratio, prestress and the number of brace struts is studied and the influence of these parameters on the mechanical behavior is discussed compressively in detail.

2对一张弦立体桁架结构的静力性能做了系统分析，研究了结构的内力和位移在矢跨比、垂跨比、预应力和撑杆数不同参数下的变化情况，全面详细的探讨了结构的主要参数对结构静力性能的影响。

Fourthly, I have discussed the method to adjust torsion through presetting decentration of support abutment, and analyzed the influence on the superstructure of it.

再次，讨论了预应力曲线梁桥预设支座偏心调整扭矩的方法，分析了支座预偏心对上部结构内力的影响。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。