热轧H型钢组合梁在公路桥梁中的适用性研究

GUO Bin-qiang,YU Mao-feng,DONG Jia-Lin

摘要:

热轧H型钢目前在公路桥梁中主要应用于临时结构和次要受力构件，其材料质量稳定、力学性能优异、单价低，在公路桥梁中应该有更广阔的应用前景。为了降低钢结构桥梁的造价，推广钢结构，实现快速装配施工，贯彻绿色环保理念，文章以杭绍甬高速公路（G92N杭州湾地区环线并行线）杭州至绍兴段初步设计为工程背景，研究了热轧H型钢组合梁在公路桥梁中的适用性。首先，调研了国内外目前生产和规划生产的热轧H型钢规格及供货情况；然后，将规格划分为700mm、900mm、1100mm、1172mm四类，通过ANSYS实体+板单元建模计算分析得到四种规格热轧H型钢组合梁的极限跨径分别为16m、20m、25m、35m，并进行了经济性分析。发现由于热轧H型钢的断面特征固定，导致用作热轧H型钢组合梁时用钢量偏大，提出了通过研发上、下翼缘板和腹板厚度可调节的热轧H型钢断面的建议，可作为热轧H型钢组合梁在公路桥梁中的推广应用的技术路径。

Abstract:

Hot rolled H-beam is mainly used in temporary structures and secondary load-bearing components in highway bridges. With the continuous improvement of the production capacity of hot-rolled H-beam in China, this paper studies the applicability of hot-rolled H-beam in Highway Bridges Based on the preliminary design of Hangzhou Shaoxing section of Hangzhou Shaoxing Expressway (g92n Hangzhou Bay area loop parallel line). First of all, the specifications and supply of hot-rolled H-beam produced and planned at home and abroad are investigated. Then, the specifications are divided into 700mm, 900mm, 1100mm and 1172mm. The ultimate span of four specifications of hot-rolled H-beam is 16m, 20m, 25m and 35m respectively through the modeling calculation and analysis of ANSYS solid + plate element, and the economic analysis is carried out. It is found that the section characteristics of hot-rolled H-beam are fixed, which leads to a large amount of steel used for hot-rolled H-beam composite beams. The suggestion of developing hot-rolled H-beam section with adjustable thickness of upper and lower flange plates and webs is put forward, which can be used as a technical path for the popularization and application of hot-rolled H-beam composite beams in highway bridges.