行人扶梯荷载作用下悬挑楼盖的振动测试与舒适度评价

针对搭接扶梯的悬挑楼盖在行人扶梯荷载作用下容易产生铅垂向振动，以某商业夹层中的悬挑楼盖为对象，通过现场振动测试，研究扶梯运行、行人数量、行走方向及行人运动状态对悬挑楼盖振动响应的影响，依据测试数据，评价悬挑楼盖振动的舒适度及人员感知度。研究结果表明：行人步频是影响悬挑楼盖振动的主要因素，而扶梯运行与否则是次要因素；多人在扶梯上以同一步频双向行走时，对悬挑楼盖产生的振动响应较单向行走时有明显削弱的现象；采用峰值加速度对悬挑楼盖进行舒适度评价，当行人在扶梯上跑动时，悬挑楼盖的振动响应易超出舒适度限值；采用KB（Konstant Beurteilungswerte）值对悬挑楼盖进行感知度评价，当行人相对扶梯静止时，悬挑楼盖的振动不会超出感知度容许值，当行人相对扶梯走动或跑动时，悬挑楼盖的振动则会超出感知度容许值。

Vibration test and comfort evaluation of cantilever floor under pedestrian-escalator load

Vertical vibration would be incurred easily under the pedestrian-elevator load in the cantilevered floor with erecting escalators. The cantilevered floor in a commercial interlayer is used as an example to study the vertical vibration response considering the influence from the escalator operation, the number of pedestrians and the walking direction.Based on the test data, we evaluate the comfort of the cantilevered floor and the perception of personnel. Results show that the pedestrian frequency is the primary factor affecting the vibration of the cantilevered floor, while the operation of escalator is a secondary factor. It is also found that compared with the unidirectional walking, the vibration response of the cantilevered floor becomes to be weakened obviously when people are walking on the escalator in two-way by the same step. The peak acceleration is used to evaluate the comfort of the cantilevered floor. It is revealed that when the pedestrian runs on the escalator, the vibration response of the cantilevered floor is easy to exceed the comfort limit. And we use the KB (Konstant Beurteilungswerte) value to evaluate the comfort of cantilevered floor. When the pedestrian is stationary relative to the escalator, the vibration of the cantilevered floor does not exceed the perceptibility allowable value. However, when the pedestrian walks or moves relative to the escalator, the vibration of the cantilevered floor will exceed the threshold value.