Method for identifying weights of cars based on dynamic strain of bridges
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A technology of vehicle weight and dynamic strain, which is applied to weighing equipment, weighing and measuring devices using elastically deformable components, can solve problems such as high price and damage to road structure, and achieve the effect of low cost of measuring equipment
Inactive Publication Date: 2014-06-04
GUANGXI UNIV +1
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However, conventional weighbridge weighing equipment is expensive, and the cheapest one for a single lane costs more than 100,000 yuan, and the original road surface structure needs to be destroyed during installation; conventional weighing scales need to be manually or with the help of camera equipment to determine the number of vehicles and axles; and Conventional weighbridges are installed on the road outside the main structure of the bridge. It is difficult to use conventional weighbridges for multi-lane bridges to make statistics on the impact of vehicles traveling on the bridge on the bridge.
Even if the conventional weighing scales are not suitable for measuring the weight of vehicles on bridges, there is an urgent need for a method or device suitable for measuring the weight of vehicles driving on bridges.
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Embodiment 1
[0034] as attached figure 1 and 2 As shown, a high-pier long-span continuous rigid-frame bridge on an expressway has a span combination of 12600cm+24000cm+12600cm and a clear lane width of 1100cm. The layout of the bridge facade is shown in figure 1 As shown, two dynamic strain test sections are arranged at the main span L / 4 and 3L / 4, the section spacing is 12000cm, and the layout of the section measuring points is shown in figure 2, one resistive dynamic strain measuring point is arranged in the middle and both sides of the bottom plate (web centerline); 150kN, 200kN, 250kN, 300kN, 350kN, 400kN, 450kN, 500kN and 550kN vehicles are used in the three lanes and different vehicle combinations are used. Car test at 60km / h, 65km / h, 70km / h, 75km / h, 80km / h, 90km / h, 95km / h, 100km / h on the roadway, and the high-speed collector automatically collects the traffic generated by the bridge when the vehicle passes The dynamic strain value ε; and the data is directly transmitted to the on-...
Embodiment 2
[0037] as attached image 3 and 4 As shown, a single-span suspension bridge on an expressway has a span of 61600cm and a clear lane width of 2×1450cm. The layout of the bridge facade is shown in image 3 As shown in , two strain test sections are arranged at 3L / 8 and 5L / 8 of the main span, and the distance between the sections is 15400cm. For the arrangement of section measuring points, see Figure 4 , 5 electromagnetic dynamic strain sensors are arranged in the bottom box of the steel box girder; 150kN, 200kN, 250kN, 300kN, 350kN, 400kN, 450kN, 500kN and 550kN vehicles are used in 6 lanes and different vehicle combinations are used, and 60km / h, 65km / h , 70km / h, 75km / h, 80km / h, 90km / h, 95km / h, 100km / h, 105km / h, 110km / h, 115km / h and 120km / h speed in the roadway sports car test, collected by high-speed The device and memory automatically collect and record the dynamic strain value ε generated by the bridge when the vehicle passes by; use wireless communication to directly tran...
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Abstract
The invention relates to a method for identifying weights of cars based on dynamic strain of bridges, comprising the following steps of: arranging the dynamic strain measurement devices on the vertical symmetrical section of a bridge; implementing a dynamic car test on a traffic lane of the bridge on which the dynamic strain measurement devices are installed, collecting the data at the same time, and transmitting the data to a computer; adopting the limited simulation to compute the theoretical dynamic strain, extracting dynamic strain time-history curve formed by the dynamic strain results, and comparing the curve with the real measurement value and analyzing to obtain the relational expression T=f(nu,epsilon) or the curve among the running speed, the peak value of the dynamic strain and the weight of the car; automatically computing the running speed through a piece of software according to the time difference and section distance when the dynamic strain of each section reaches the peak value; obtaining the average value of the peak value of each measurement point of the same section; and putting the average value in the relational expression T=f(nu,epsilon) or the curve to compute or compare, and then obtaining the weight of the car passing through the section. The method is suitable for identifying the weights of the cars on the bridge; and the cost of the measurement equipment is low, so that the method is easy to realize.
Description
technical field [0001] The invention belongs to the field of vehicle weight measurement methods, and in particular relates to a method for identifying the weight of vehicles passing through a bridge at the same time based on bridge dynamic strain, which is mainly used in the field of bridge health monitoring, and can realize the statistics of bridge traffic flow and vehicle load spectrum Automatic statistical work, judging whether other physical parameters of the bridge health monitoring are abnormal, and monitoring the damage and aging of the bridge structure. Background technique [0002] As an integral part of the transportation system, bridges have played an important role in the development and evolution of human civilization. With the development of modern technology and the continuous growth of transportation demand, more and more large bridges (such as cross-sea bridges, long-span bridges, etc.) are appearing in people's field of vision. It has important strategic s...
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