深孔钢闸门面板参与主梁弯曲的有效宽度分析  

Effective width analysis of a panel involved in the main beam bending of a steel arc gate in deep outlet

作　　者：申永康[1,2] 王正中[1] 刘计良[1] 

机构地区：[1]西北农林科技大学水利水电工程研究所,陕西杨凌712100 [2]杨凌职业技术学院建筑工程学院,陕西杨凌712100

出　　处：《水力发电学报》2011年第4期161-167,共7页Journal of Hydroelectric Engineering

基　　金：国家"863"计划(2002AA62Z3191);陕西省自然科学基金项目(907C1)

摘　　要：深孔钢闸门主梁弯应力非线性分布导致面板参与主梁弯曲的有效宽度不仅与面板长宽比有关,而且与主梁的高跨比、翼缘与腹板的面积比等因素有关,现行规范SL74-95对此问题缺乏考虑;本文根据弹性力学建立面板参与主梁弯曲的应力分析模型,考虑深孔钢闸门主梁的弯剪耦合作用及面板对主梁剪切系数影响,利用最小势能原理提出了深孔钢闸门面板参与主梁弯曲的有效宽度系数的计算公式;分析主梁高跨比r、面板长宽比l0/b、主梁剪切系数λs及翼缘腹板面积比β等参数对面板有效宽度的影响;结果表明:随着主梁剪切系数λs、高跨比r、翼缘腹板面积比β增大,面板有效宽度系数明显增大,主梁剪切系数及高跨比对窄翼缘主梁面板的有效宽度影响较大,最大相差超过48%,不容忽视;现行规范结果对简支主梁偏危险,而对双悬臂主梁或连续主梁偏保守。Under the distributed nonlinear bending stress in the main beam of a steel arc gate in deep outlets,the effective width of an arc gate panel involved in the beam bending depends on the panel length-width ratio,the beam height-span ratio and area ratio and the other factors.This issue is not considered by the current standard SL74-95.By the theory of elastic mechanics,a stress analysis model was developed for the effects of the moment-shear force coupling stress of the beam and the beam-panel coupling function.The effective panel width was calculated by the minimum potential energy principle,and formulas were put forward to calculate its influencing factors such as height-span ratio r,beam shear coefficient λs,length-width ratio l0/b,ratio β of section area.The results show that the effective width coefficient ξ significantly increases with λs,r and β,and that particularly in the case of a narrow flange beam the first two factors of more importance may cause a difference of over 48% that is obviously not negligible.The result obtained by the current standard would be biased towards dangerous for simply-supported main beam and towards conservative for double-cantilevered or continuous main beam.

关 键 词：水工结构 有效宽度 最小势能原理 深孔钢闸门 

分 类 号：TV663.2[水利工程—水利水电工程] TV663.4