School;
of;
Transportation;
Science;
and;
Engineering,;
Harbin;
Institute;
of;
Technology,;
Harbin;
150090,;
China;
Transportation;
College,;
Southeast;
University,;
Nanjing;
210096,;
China;
等效抗弯刚度; 弯梁桥; 简支; 变截面; 等效转动惯量; 预弯梁; 力学特性; 杨氏模量;