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钢-高强混凝土组合梁收缩的计算分析 被引量:2
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作者 章胜平 陈旭 +2 位作者 楚秀娟 彭祖强 马江鸿 《公路工程》 北大核心 2020年第2期34-39,共6页
对简支和连续组合梁,按照全截面法基于有效模量比计算收缩徐变所退化的混凝土翼板面积和惯性矩,推导了各种收缩效应的计算公式。对比欧洲混凝土模式规范的新旧模型,结果表明:在简支梁的收缩自应力和挠度上,高强和普通混凝土几乎相同;在... 对简支和连续组合梁,按照全截面法基于有效模量比计算收缩徐变所退化的混凝土翼板面积和惯性矩,推导了各种收缩效应的计算公式。对比欧洲混凝土模式规范的新旧模型,结果表明:在简支梁的收缩自应力和挠度上,高强和普通混凝土几乎相同;在连续梁的收缩次弯矩上,高强略小于普通混凝土;按照MC1990收缩徐变模型将显著低估这些收缩效应,由此低估钢筋用量将可能引起混凝土开裂等结构的使用和安全问题。 展开更多
关键词 桥梁工程 全截面法 收缩效应 应力 挠度 次弯矩
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Total Cross Sections for Electron Scattering on Polyatomic Molecules (CH4, CO2,NO2, and N2O) at 10~3000 eV
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作者 SUNJin-Feng XUBin +1 位作者 LIUYu-Fang SHIDe-Heng 《Communications in Theoretical Physics》 SCIE CAS CSCD 2005年第5期895-899,共5页
A new modified formulation of the Additivity Rule (AR) was proposed to calculate the total electron scattering cross sections for CH4, CO2, NO2, and N2O, considering the overlapping between atoms in molecules and the ... A new modified formulation of the Additivity Rule (AR) was proposed to calculate the total electron scattering cross sections for CH4, CO2, NO2, and N2O, considering the overlapping between atoms in molecules and the not fully transparency of the molecules. The present calculation covers the range of impact energy from 10 to 3000 eV. The results are compared with experimental data and other theories where available. The atoms are presented by spherical complex optical potential, which is composed of static, exchange, polarization, and absorption terms. 展开更多
关键词 total cross section additivity rule optical potential model
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