论文部分内容阅读
为研究由单根C形和U形冷弯薄壁型钢拼合而成的箱形截面梁的受弯性能,对5组共计15个试件进行了静载试验。考察了梁跨高比、翼缘宽厚比、截面高宽比,以及连接螺钉间距对双肢拼合箱形截面梁破坏模式和受弯承载力的影响,并采用ANSYS有限元软件对双肢拼合箱形截面梁进行数值模拟与影响因素分析。结果表明:试件的破坏模式为跨中受压翼缘和腹板发生局部屈曲,屈曲半波长均为连接螺钉的间距。改变翼缘宽厚比和截面高宽比对双肢拼合箱形截面梁的受弯承载力影响较大,而改变连接螺钉间距(150~600 mm范围内)和梁跨高比对其受弯承载力影响较小。在有限元参数分析的基础上,提出了用于计算双肢拼合冷弯薄壁型钢箱形截面梁受弯承载力的抗弯模量折减法和计算式,并由试验数据验证了该简化计算方法的适用性。
In order to study the flexural behavior of box-section beams made of single C-shaped and U-shaped cold-formed thin-wall steel, a total of 15 specimens in 5 groups were subjected to static load test. The effects of beam span ratio, flange aspect ratio, aspect ratio, and the distance between connecting screws on the failure mode and flexural capacity of two-legged box girder were investigated. ANSYS finite element software Numerical Simulation of Beams with Cross Section and Analysis of Influence Factors. The results show that the failure mode of the specimen is local buckling of the compression flange and web in the mid-span, and the buckling half-wave length is the spacing of the connecting screws. Changing the aspect ratio and the aspect ratio of the flange have a great influence on the flexural capacity of the two-leg split box girder, while changing the ratio of the connecting screw spacing (within the range of 150-600 mm) and the beam span ratio to the flexural bearing Force less affected. On the basis of the finite element analysis, the bending moment modulus and the formula for calculating the flexural capacity of cold-formed thin-walled steel box girders with two legs are put forward. The simplified calculation The applicability of the method.