Method for improving comfort level of existing pedestrian bridge
A pedestrian bridge and comfort technology, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem of not really considering the randomness of the load, it is impossible to reflect the vibration status of the pedestrian bridge, and it cannot effectively reduce the pedestrian bridge. Vibration acceleration and other issues, to achieve good vibration reduction effect, high precision, and improve comfort
Inactive Publication Date: 2018-08-07
CHANGZHOU INST OF TECH
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Problems solved by technology
This assumption method has the following disadvantages: firstly, the pedestrian load is only an assumption, and the randomness of the load cannot be really considered; secondly, the footbridge is also stimulated by environmental loads such as traffic loads and wind loads
Therefore, the previous analysis methods cannot reflect the real vibration conditions of the footbridge, so they cannot effectively reduce the vibration acceleration of the footbridge, thereby improving the comfort of the footbridge
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[0020] The present invention will be described in further detail below in conjunction with accompanying drawing
[0021] The device of the present invention mainly includes a three-way accelerometer, a NI (National instrument) data acquisition module, a mass tuning damper 5, and a computer. The software includes NI (National instrument) modal analysis module, FEMtools model update module, and ANSYS software.
[0022] In the process of arranging acceleration, it is best to arrange three-way accelerometers at each node, and the more accelerometers are arranged, the better, at least five.
[0023] In the NI modal analysis module, first draw the model of the pedestrian bridge according to the structural design drawing, mainly according to the geometric position of the beam. It is required to input and collect as many acceleration time histories as possible, at least 15 acceleration time histories, each The node inputs the three-dimensional acceleration time history. Through the ...
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The invention discloses a method for improving the comfort level of an existing pedestrian bridge. Measuring point acceleration in the running process is simply measured by an accelerometer to updatea finite element model, the number, parameters and positions of tuned mass dampers are optimized on the basis, and the comfort level of the existing pedestrian bridge is improved by optimized analysisof the dampers. The method is simple to apply and good in flexibility, modal parameters can be detected in the running state of the measured pedestrian bridge, measurement of input excitation signalsis omitted, and measuring results are high in precision. On the basis, by optimization design of each TMD (tuned mass damper), damping effects are good, and the comfort level of the pedestrian bridgeis effectively improved. By the method, the comfort level of the existing pedestrian bridge can be more effectively improved.
Description
technical field [0001] The invention relates to a method for effectively improving the comfort of a pedestrian bridge, which belongs to the field of civil engineering. Background technique [0002] Pedestrian bridges with large spans and high flexibility will produce large accelerations and deformations under the action of pedestrian loads and other environmental loads (such as road traffic and wind loads). In order to improve the comfort, there are mainly two methods. One is to increase the rigidity of the structure. This method needs to increase the cross-section of the structural member, which is not economical. Another approach is the method of adding structural damping, such as viscous dampers, tuned mass dampers (TMD). Among them, the method of reducing the vibration acceleration of pedestrian bridges with tuned mass dampers is more common. The main problem is that the acceleration damping effect of the tuned mass damper on the footbridge is very sensitive to the dyn...
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IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/23G06F30/333
Inventor 栾小兵冯宁宁周军文鲁良辉齐永胜
Owner CHANGZHOU INST OF TECH