纸桥过车〞比赛实验报告制作者:人大附中 初二11班 赵锦煦竞赛号: 11C 设计原那么：充分利用20张A4纸，搭建拱形纸桥，使其承重最大最初的设计方案 结构特点： 双桥墩设计，桥墩稳定，粘接处牢固 拱形桥面，承重能力强 斜拉纸条受拉力，与桥墩、纸筒构成三角形使桥更稳固结果： 用纸20张，制作简单 经试验承重高达2公斤 后来得知该桥墩不符合设计规那么，故放弃这个方案最初的设计方案 —如何使桥承重更多ü结实的桥墩ü筒形的横梁ü平整、稳定的桥面ü第二重保险——斜拉ü结论ü借鉴与学习ü体会、感悟最终的设计方案 最终的设计方案 结实的桥墩ü桥墩的制作方式是先将两个长45厘米〔1.5张纸〕的纸筒在下方固定；上方在适当位置折叠，保证上方宽度约15厘米；最后在中间插一根30厘米长的纸筒即可 结实的桥墩这种桥墩的好处：桥墩上宽下窄，底面符合“小于5厘米〞的规那么上端宽度很大，便于固定横梁和桥面稳定性好、承重量大用纸4张 筒形的横梁ü横梁由两根纸筒构成，运用了纸筒形状受力大的特点，并且两端运用了巧妙的连接方法：将纸筒压扁，沿折痕剪开〔四边〕，便出现“分叉〞的现象，将它们粘在两筒上，便能结实、牢固地固定桥梁了。
ü用纸11张〔含两端用纸共２张〕 平整、稳定的桥面ü桥面其实只是用单层张纸构成，纸的两端粘在纸筒上，保证小车能顺利通过ü用纸3张 第二重保险——斜拉ü斜拉构成三角形，由于三角形的稳定性，当桥面弯折的时候，斜拉便可以起到稳定桥面的作用ü用纸1张 结论ü总计用纸19张ü通过实验测试，该纸桥承重量最终为1270克，承重比约为12.1 借鉴与学习比赛中发现以下结构较好：上下双拱形结构中间增加支撑梁〔下层为单层纸〕倒梯形结构斜拉桥结构 体会、感悟ü“纸桥承重〞的实验工程一直是一个流行的课题，虽看似容易、道理看似浅显易懂，但在实践探究的过程中仍会遇到很多问题，克服了这一道道难关，对在理解与实践之间的过程才会有更深一层的感悟ü通过亲自动手，学到了一定的知识 最后，感谢此次大赛组委会付出的劳动，祝愿今后人大附中科技节越办越好！ 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