CAJ | 학술논문

由于超限超载车辆迅速增长，梁底开裂已成为板梁桥营运中的首要病害。以往所使用的粘贴钢板加固，钢材使用率低，加固效果并不理想。根据提高主梁抗弯刚度可减小主梁挠度及内力，并最终抑制梁底开裂的原理，首次提出π型钢板加固法。现利用 ANSYS 程序进行空间非线性有限元仿真计算。对π型钢板与粘贴钢板加固后主梁进行对比分析，得出π型钢板加固对提高主梁极限承载力、防止主梁底板开裂，效果优于粘贴钢板加固；对比分析使用不同腹板高度与钢板厚度的π型钢板加固后的主梁极限承载力，得出π型钢板腹板高度对提升加固效果的影响较钢板厚度大；进一步对比分析π型钢板应用于不同跨径板梁的稳定性问题，提出不同跨径板梁对π型钢板截面尺寸的具体要求。
유우초한초재차량신속증장，량저개렬이성위판량교영운중적수요병해。이왕소사용적점첩강판가고，강재사용솔저，가고효과병불이상。근거제고주량항만강도가감소주량뇨도급내력，병최종억제량저개렬적원리，수차제출π형강판가고법。현이용 ANSYS 정서진행공간비선성유한원방진계산。대π형강판여점첩강판가고후주량진행대비분석，득출π형강판가고대제고주량겁한승재력、방지주량저판개렬，효과우우점첩강판가고；대비분석사용불동복판고도여강판후도적π형강판가고후적주량겁한승재력，득출π형강판복판고도대제승가고효과적영향교강판후도대；진일보대비분석π형강판응용우불동과경판량적은정성문제，제출불동과경판량대π형강판절면척촌적구체요구。
Due to the factors of vehicles overloading, cracking on plate beam bottom has become one of the primary problems in plate-beam bridge operations. In sticking steel slab technology, steel products utilization rate is low, so the reinforcement effect is not ideal. According to the principle that the increase of the primary beam flexural stiffness can decrease the maximum vertical deflection and internal forces of the primary beam under the same load, and eventually reduce the beam bottom cracks, the author first proposed the π-type steel strengthening technology. And by utilizing ANSYS program to carry out the space nonlinear finite element simulation calculation, the author compared the effect of primary beam bottom crack prevention by changingπ-type steel height and ribbed slab thickness with sticking steel slab technology, Following are the conclusions drawn by the authors:the resisting force and the ability to resist deformation of the plate beam in the limit state of the former case improved a lot more than the latter one, and the effect of improving capacity and preventing primary beam bottom crack is better by usingπ-type steel technology than sticking steel slab technology. The author also further compared and analyzed the stability problem of π-type steel used for plate beam with different lengths and optimized theπ-type steel cross section dimensions.