论文部分内容阅读
对于大跨度钢结构而言,太阳辐射下的非均匀温度场会引起显著的热变形和热应力,加大了结构设计的难度.为了减小太阳辐射作用下钢管的温度,本文提出了四种遮挡构造,并通过试验研究了四种构造降低钢管温度的效果,具体结论如下:(1)夏季太阳辐射作用下,无遮挡措施的试件和腹板开洞试件的最高温度分别为65.1,℃和54.5,℃,采用开孔遮阳板、无开孔遮阳板和带保温层遮阳板防护的钢管温度均在45,℃左右;(2)太阳辐射作用下钢管温度常超出周围环境气温30,℃左右,使得室外大跨度钢结构产生较大的热变形和热应力;(3)腹板开洞对降低太阳辐射下钢管温度效果不明显,而采用开孔遮阳板、无开孔遮阳板和带保温层遮阳板等构造措施能显著降低太阳辐射下钢管温度.采用开孔钢板遮挡构造一般造价低、风荷载小,因此建议今后在工程中采用.
For large-span steel structures, the non-uniform temperature field under solar radiation can cause significant thermal deformation and thermal stress, which increases the difficulty of structural design.In order to reduce the temperature of steel pipe under solar radiation, four kinds of The main conclusions are as follows: (1) Under summer solar radiation, the maximum temperatures of specimens without unobstructed measures and those with web openings were 65.1, ℃ and 54.5 ℃, the use of open-hole sun visor, non-perforated sun visor and insulation with sun visor protection of steel pipe temperature are around 45 ℃; (2) under the influence of solar radiation temperature exceeds the ambient temperature of 30, ℃, so that the outdoor long-span steel structure has a greater thermal deformation and thermal stress; (3) web openings to reduce the solar radiation under the pipe temperature effect is not obvious, and the use of open-hole sun visor, Structural measures such as insulation with sun visors can significantly reduce the temperature of the steel tube under solar radiation. The use of perforated steel sheet construction generally low cost, wind load is small, it is proposed that the future use of the project.