使成平面
2.The practicality space analysis method is suggested according to structure endure force character of large rectangle aqueduct with multi-longitudinal beams, thus making the complicated space structure calculation decompose into two related plane problems.
3.2. The method of preparing BLM was improved . The BLMs,including the conventional planer BLM,the s-BLM and the Agr-BLM,were more easier to be formed, and more stable in the mechanics.
