预测列车引起拟建建筑物的振动

Predicting train-induced vibration of building in planning

针对行驶列车引起拟建建筑物的振动无法通过现场测试这一问题,将拟建场地的实测地面振动作为输入,在频域计算拟建建筑物的振动响应,从而预测列车引起的拟建建筑物振动情况.提出了3种预测方法:套用规范的方法、模拟规范的模糊数学方法和纯模糊数学的方法.通过一个算例,分析比较了3种方法的预测效果.结果表明,套用规范的方法没有考虑不确定性的影响,可能导致错误的预测;模拟规范的方法,虽然考虑了不确定性的影响,但预测结果的可靠性仍难以保证;纯模糊数学方法考虑了不确定性的影响,并在预测结果中完整地反映了拟建建筑物的可能振动情况.

It is impossible to measure the train-induced vibrations of building in planning in situ. B considering the ground vibration measured in the site as an input, the vibration responds of building were computed in frequency domain for predicting the train-induced vibrations of the building in planning. Three predicting approaches were proposed, which are the approach according to the code, the fuzzy math approach simulating the code, and the pure fuzzy math approach. The feasibilities of these approaches were analyzed in an example. The results show that incorrect prediction may be conducted by the approach according to the code because of neglecting the uncertainty, and the prediction reliability of the fuzzy math approach simulating the code is also not guaranteed, while the possible vibration of the building in planning and the influence of the uncertainty can be well predicted by the pure fuzzy math approach.