二氧化碳管道输送过程管径设计分析

以洞口尺寸、形状和净距为参数，对28根开孔梁和2根实腹梁的力学性能进行了试验研究与对比分析，研究其破坏形态及破坏机理等，并与未开孔梁的试验结果进行对比.提出了基于费氏空腹桁架理论的开孔梁承载力计算公式.结果表明，开孔梁内的应力分布、挠度变化不再完全符合传统弯曲理论.随着径腹比的加大，开孔梁的承载力和刚度呈显著下降趋势.方孔梁的承载力略大于外接圆孔，以外接圆孔代替方孔梁的承载力偏于安全.对于径腹比为0.5的多洞口梁而言，当方洞和圆洞净距分别大于2倍和2.5倍孔长时，可忽略洞口间的相互影响.通过对比分析，理论结果与实验结果的误差平均值为15%左右，从而验证了修正后的空腹桁架理论计算公式的准确性和可靠性.

Pipe Diameter Design and Analysis of Carbon Dioxide Pipeline Transportation Process

The effect of parameters, such as the size, shape and clear distance of holes, on the mechanical performance of the joists was analyzed experimentally. Compared with 2 joists with no web holes, a total of 28 OSB webbed bamboo joists were tested to failure to investigate their failure modes and failure mechanism. Based on the Vierendeel truss theory, the design formula of the composite joists was presented. It was found that the holes changed the stress distribution in the webs and the deflection did not conform to the traditional bending theory. With the increase of the ratio of height to web height, the load carrying capacity and stiffness of the joists with holes decreased significantly. A web hole with sharp corners had a bigger negative impact on strength than a circular hole of similar size. The results from the tests on I shaped joists with two circular and two square web holes with a size of 50 percent web depth showed that the critical clear distance was about 2 times and 2.5 of the web hole size respectively. The comparison showed that the error between the theoretical results and the experimental results was about 15%, verifying the accuracy and reliability of the revised formula of Vierendeel truss theory.