几何参数对预应力波纹钢腹板箱梁桥受力性能的影响分析

对实际工程中某三跨波纹钢腹板体外预应力连续箱梁桥建立有限元模型,通过改变腹板参数,探讨几何参数对桥梁整体受力性能的影响.分析表明,随着波纹钢腹板折叠角的增大,波纹钢板的抗弯刚度逐渐减小,当折角在10°～40°范围内变化时,波纹钢板的抗弯刚度变化最为明显; 波纹钢腹板水平面板宽度b增大会提高箱梁的抗弯刚度,但b值太大会影响波纹钢腹板的整体受力性能; 增加波纹板的厚度能显著提高箱梁的抗剪性能,并在一定程度上能够提高箱梁的抗弯刚度,但板厚增加到20 mm时,其对提高箱梁的抗剪性能和抗弯性能的贡献逐渐趋小; 波纹钢腹板的倾角不宜太大,宜小于25°.

Effects of geometric parameters on mechanical characters of pre-stressed box-girder bridge with corrugated web

The finite element model of three-span pre-stressed box-girder continuous bridge with corrugated web are built to respectively analyze the effects of geometric parameters on mechanical characters by changing the parameters of pre-stressed box-girder bridge with corrugated web. The results show that the increment of the angle of the corrugated plate can reduce the vertical stiffness of bridge, stiffness of bridge changes obviously within the range of 10°-40°; if the value of the horizontal fold of the corrugated plate b is too large, it will weaken the corrugated plate’s whole property under the load; increasing the thickness of the corrugated web can significantly improve the shear performance and add to the stiffness of the box-girders within certain range, but when it reached to 20 mm, the effect will be weaken; the angle of the web would be within 25°.