Based upon finite element simulation analysis, load tests and long-term observation, a detection and evaluation system for old steel bridge safety was developed in this thesis.

本文以桥梁仿真分析技术为主线，以整治效果为目标，以荷载试验和长期观测为检验手段，建立了既有钢桥裂纹安全检测评估系统。

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The simulated ultimate load formula and double-control design method of slender eccentrically compressed reinforced concrete member were proposed by nonlinear finite element simulation analysis.

并通过非线性有限元模拟分析，给出了细长钢筋混凝土压杆的极限承载力表达式以及由此确定的双控设计法。

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