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| 对影响线正负号问题的探讨 | |
| 引用本文： | 于玲玲,汪海峰,唐仁忠,张健. 对影响线正负号问题的探讨[J]. 建筑科学与工程学报, 2001, 18(3): 13-16 |
| 作者姓名： | 于玲玲 汪海峰 唐仁忠 张健 |
| 作者单位： | 1. 烟台大学土木系 2. 烟台市环卫处 3. 烟台市福山财政局 |
| 摘 要： | 对力学中影响线正负号的规定进行了研究,通过对几个例子的分析,指出了规定中的局限性所在,并得出了新的结论(1)影响线的正负号仅表示实际的内力(或反力)与假设的方向是否一致;(2)为避免静力法和机动法作图有时可能出现的矛盾,提出作影响线时需再建立一个y坐标,并以与P=1指向相反的方向作为y轴的正向.最后,用算例全面验证了结论的正确性. |
| 关 键 词： | 影响线静力法 机动法 正负号 |
| 文章编号： | 1001-7569(2001)03-0013-04 |
| 修稿时间： | 2001-06-05 |
Discussion on the positive and negative sign for influence line |
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| YU Ling ling ,WANG Hai feng ,TANG Ren zhong ,ZHANG Jian. Discussion on the positive and negative sign for influence line[J]. Journal of Architecture and Civil Engineering, 2001, 18(3): 13-16 | |
| Authors: | YU Ling ling WANG Hai feng TANG Ren zhong ZHANG Jian |
| Affiliation: | YU Ling ling 1,WANG Hai feng 2,TANG Ren zhong 3,ZHANG Jian 2 |
| Abstract: | In view of the limitations in the stipulations to the positive and negative sign for the influence line,the problem by some examples is analyzed and some new conclusions are drawn:(1)the positive and negative sign for the influence line simply indicates if the direction of the actual internal force is consistent with the hypothesis;(2)a y axial coordinate which directs the negative direction of the unit load was needed to avoid the occasional contradictions result obtained by the static method and kinematic method.Finally,an example was given to verify the correctness of the conclusions all round. |
| Keywords: | influence line static method kinematic method positive and negative sign |
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