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小跨高比混凝土简支箱梁静力性能试验研究
引用本文:陈朝晖,黄景华,李观宇,马东升. 小跨高比混凝土简支箱梁静力性能试验研究[J]. 土木建筑与环境工程, 2011, 33(4): 13-19
作者姓名:陈朝晖  黄景华  李观宇  马东升
作者单位:重庆大学 土木工程学院;山地城镇建设与新技术教育部重点实验室,重庆 400045;;重庆大学 土木工程学院;山地城镇建设与新技术教育部重点实验室,重庆 400045;;云南省电力设计院,昆明 650051;;华北电力设计院工程有限公司,北京 100120
基金项目:国家重大科技专项“水体污染控制与治理科技重大专项”资助项目(2008ZX07315-001-1)
摘    要:山地城市排水干管埋地箱涵由于滑坡导致地基塌陷而成为简支箱涵,支承方式的改变导致管道结构存在破坏风险.为此,文章对简支下小跨高比埋地箱梁进行了模型静力加载试验,分析了小跨高比埋地箱涵在简支条件下的破坏形式、抗剪性能以及剪力滞效应,讨论了现行有关设计规范对于箱涵抗剪承载力计算之不足.研究表明,竖向均布荷载作用下,小跨高比箱...

关 键 词:钢筋混凝土  简支箱梁  抗剪性能  小跨高比  剪力滞  平截面假定
收稿时间:2011-01-17

Experimental Analysis on Static Behaviors of Simple-supportedReinforced Concrete Box Girder with Small Depth-to-span Ratio
CHEN Zhao-hui,HUANG Jing-hu,LI Guan-yu and Mao Dong-sheng. Experimental Analysis on Static Behaviors of Simple-supportedReinforced Concrete Box Girder with Small Depth-to-span Ratio[J]. Journal of Civil,Architectrual & Environment Engineering, 2011, 33(4): 13-19
Authors:CHEN Zhao-hui  HUANG Jing-hu  LI Guan-yu  Mao Dong-sheng
Affiliation:School of Civil Engineering;Key Laboratory of New Technology for Construction of Cities in Mountain Area,Ministry of Education,Chongqing 400045,P.R.China;;School of Civil Engineering;Key Laboratory of New Technology for Construction of Cities in Mountain Area,Ministry of Education,Chongqing 400045,P.R.China;;Yunnan Electric Power Design Institute,Kunming 650011,P.R.China;;North China Power Engineering CO.,LTD,Beijing 100120,P.R.China;
Abstract:The buried box girders in the mountain city sewage pipeline system would be turned into simple-supported girders because of the removal of the foundation caused by landslide.This change of supporting would result in the failure risk of pipeline structure.The static properties of the buried box girders with small depth-to-span ratio in simple-supported condition are experimentally analyzed.The failure pattern,shear behavior and shear lag effect of the buried box girders in simple-supported condition are studied.The shortages in the present design codes for the calculation of shear capacities of the box girders are also discussed.It is shown that under the vertical uniformly distributed load,the crack distribution of the box girders is uniform,and no major critical diagonal crack is formed,and the box girders lose the bearing capacity in the form of concrete diagonal rod crushing.As the main shear-bearing components,the stirrups devote much to shear capacity of the box girder after concrete cracking.The strains of the longitudinal rebars are affected by those factors such as the redistribution of internal force and cracks,so only few areas of the box girders show the shear lag effect.The change of supporting form leads to the premature cracking of concrete and affects the serviceability of the sewage pipeline.
Keywords:reinforced concrete  simple-supported box girder  shear behavior  small depth-to-span ratio  shear lag effect  assumption of plane section
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