The simplest type of span is a beam bridge, consisting of a rigid beam between tow supports.
最简单的桥梁是梁桥，由钢性梁和两端的两个支柱构成。
2
The result of analysis show that there is more yield hinges on the top tow storey columns of 6-storey frame7. It means that the heavy vertical load go against to the beam hinges mechanism of frame.