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目前,既有结构承载力计算中遇到的最大问题是设计荷载与实际荷载存在偏差,这种偏差可能来源于施工阶段,也有可能来源于后期使用阶段一些不确定因素的影响。使用三维激光扫描技术可以获取钢梁真实的挠度曲线,然后利用挠曲线近似微分方程求出钢梁现状下的等效荷载,将等效荷载作用下梁的响应作为既有钢梁在现状下的受力状态。在此基础上对其进行结构承载力计算更具有实际意义。
At present, the biggest problem encountered in the calculation of existing structural bearing capacity is the deviation between the designed load and the actual load. Such deviation may come from the construction stage and may also come from the influence of some uncertainties in the later stage of use. The real deflection curve of the steel beam can be obtained by using the 3D laser scanning technology. Then the equivalent load of the steel beam can be obtained by using the approximate differential equation of the deflection curve. The response of the beam under the equivalent load is taken as the existing steel beam Force state. On this basis, it is more practical to calculate the bearing capacity of the structure.