A calculation method of ultimate bending capacity of reinforced severe damage beam with fiber reinforced polymer
A calculation method and bearing capacity technology, applied in calculation, special data processing applications, instruments, etc., can solve problems such as less research
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[0117] The following are specific examples using the technical solutions disclosed in the present invention:
[0118] Now take the B0-yl-1 beam as an example to apply the calculation formula. Severely damaged reinforced concrete beams have a concrete strength grade of C40, and the average cubic compressive strength is 42.8MPa. According to the specification, take f ck = 26.8MPa, b = 200mm, h = 300mm, h 0 =269mm, E B = 105GPa, A B =1×190mm×0.115mm=21.85mm 2 , F y = 426.7MPa, A s =340mm 2 , A s =31mm, l 0 = 2.1m. The specific calculation process is as follows:
[0119] (1) Incorporating the above parameters into formula (9) to calculate the values of a, b and c, a=309508258.1N·mm, b=-36639892.2N·mm, c=-2271307.5N·mm.
[0120] Put the values of a, b and c into formula (8), and calculate ξ n =0.1633, then the height of the compression zone x n =ξ n h 0 = 43.93mm.
[0121] (2) According to Figure 4 It can be seen that the cracks have already extended to the height of the compression...
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