Concrete elastic modulus and concrete creep and shrinkage variety at different time are reckoned in by using time increment analysis method and concrete creep and shrinkage secondary force is calculated by using effective elastic modulus . bridge stability analysis program is developed on the base of structure matrix displacement method , the program adopts visual basic language , has friendly interface and visual data input windows . the buckling safety factor of currently finished structure is given as result 为计入混凝土弹性模量的变化及混凝土徐变收缩随混凝土的龄期与外荷载加载时间不同而变化的影响，采用时间增量法对每个计算阶段根据其阶段内时步数进行循环，以计算时段内弹性应力、应变增量和徐变、收缩产生的应力应变增量，利用有效弹性模量法计算混凝土徐变收缩次内力，在此基础上，结合结构矩阵位移法的基本理论编制开发了计入混凝土时效效应的高墩大跨径桥梁稳定分析程序。
All concrete structures are exposed to volume changes caused by hydration reactions in the early age . if the volume changes are restrained , stresses is generated which will cause cracking when it overcomes the tensile strength . as the mechanical properties of early age concrete vary with time , especially the creep degree depends on the time elapsed and the time at loading , to calculate the stress of concrete structure is a complex nonlinear problem . the finite element method ( fem ) can take account of the evolution of the stiffness properties , the development of thermal strain , creep , shrinkage and so on . in this paper , a general approach for numerically simulating this type of behaviour is presented firstly . then , how to solve this problem is introduced by the general finite element software ansys using the initial stress method . finally , a detailed description of an example calculation that demonstrates the potential of the numerical simulation strategy follows 早期混凝土由于水化反应都会产生体积变化.如果体积变形受到约束就会产生应力,一旦超过混凝土的抗拉强度就会产生裂缝.由于早期混凝土的力学性能是随时间变化的,特别是徐变,它不仅与加载时间有关而且同时随龄期而变化,因此计算早期混凝土结构应力是较为复杂的问题.有限单元法不仅可以考虑混凝土刚度的变化,而且可以考虑温度、徐变、收缩等因素.本文利用初应力法对通用有限元软件ansys进行了二次开发,通过工程实例计算了高层建筑地下室侧墙早期混凝土应力的变化过程,并提出了相应的抗裂措施
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Furthermore , the supposition of galvanic couple is drawn into the procedure of corrosion fatigue crack growth of aluminum alloys , the relation of couple current vs loading time is determined with electrochemical methods . a formula in the theory is deduced which expresses the stress corrosion crack growth rate of lc4cs aluminum alloy , the results of mathematical modeling preferably correspond with examination 再将“耦合作用”的猜想，引入铝合金的腐蚀疲劳裂纹扩展过程中，用电化学的方法测定耦合电流与加载时间的关系，并从理论上导出lc4cs铝合金应力腐蚀裂纹扩展速率的数学表达式，数学模拟的结果与实验值具有较好的一致性。
