弹性固支平板钢闸门主梁的可靠度分析  

Main Girder Reliability of Plane Gate Fixed by Elastic Bearing

作　　者：王羿[1] 王正中[1,2] 孙丹霞[3] 赵延风[2] 

机构地区：[1]西北农林科技大学水利与工程建筑学院,陕西杨凌712100 [2]西北农林科技大学水工程安全与病害防治研究中心,陕西杨凌712100 [3]中国水电顾问集团西北勘测设计研究院,西安710065

出　　处：《长江科学院院报》2011年第4期54-58,79,共6页Journal of Changjiang River Scientific Research Institute

基　　金：国家"863"高技术研究与发展计划项目(2002AA62Z3191);陕西省水利科技专项计划项目(2006-01)

摘　　要：针对目前平板钢闸门结构形式存在的内力分布不均,主梁跨中弯矩大的问题,根据超静定结构承载力高于静定结构的原理,提出了弹性固定支座平板钢闸门主梁新型结构形式。以跨中截面与支座截面等安全度为原则,确定弹性固定支座截面合理转角;根据结构可靠度理论评价该结构主梁的可靠度指标,并与现行结构形式主梁的可靠度进行比较。结果表明:该新型结构可以在主梁截面不变情况下提高可靠度指标1.44,在可靠度指标不变情况下减少材料30%,可靠度沿跨长的分布均匀,为一种经济合理、安全可靠的结构形式。To solve the problems in current plane gate structures such as uneven distribution of internal forces and large bending moment in main girder mid-span,a new main girder structure of plane steel gate fixed by elastic bearing is proposed according to the theory that the bearing capacity of statically indeterminate structure is higher than that of statically determinate structure.Taking the equal safety degree between mid-span section and bearing section as a principle,the reasonable corner of the elastic fixed bearing section is determined;and based on structural reliability theory,the reliability index of the main girder is evaluated and is compared with the reliability of existing structure girder.The results show that the new structure can improve the reliability index by 1.44 under a constant main beam section;or reduce the material consumption by 30% under a constant reliability index;and the distribution of reliability along the span length is uniform.Therefore,it is an economical,safe and reliable structure.

关 键 词：平板钢闸门 主梁 弹性固支 合理转角 可靠度分析 

分 类 号：TV663.4[水利工程—水利水电工程]