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In the expression of bridge span terminology (16×20m) ×3 refers to the bridge has three standard joints, each with 16 spans, and the net span of each span is 20m, which expresses the total span of the bridge, reflecting the flood discharge capacity of the bridge, where the joint refers to the beam span structure between the adjacent two expansion joints of the bridge, and there is also a word in the road, which refers to the number of road lanes divided by the separation zone, these two words often appear in the background of the case, which is very important for us to understand the case and must be understood thoroughly. As for the middle beam and the side beam, it is understood literally, the side beam refers to the beam plate on both sides of each hole, and the middle beam is of course the beam plate other than the beam plate on both sides, this concept textbook does not, we add here by the way, the basic knowledge involved in the case background is explained clearly in the course of the analysis of the past questions, and the corners and corners are cleaned
