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single column
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  single column
The control scheme is applied to an example reactive distillation column in which two products are produced in a single column and the reversible reaction A+B=C+D occurs.
      
A systematic method of obtaining model parameters for the SMB simulation from single column chromatography experiments was presented.
      
The possibility of applying SMB chromatography for the separation of 2,6-DMN and 2,7-DMN was investigated by numerical simulation based on the single column chromatography experimental data.
      
Differential mass balances which can extend a column model from a differential single column to an integral column and heat balances were suggested.
      
The mass transfer in a differential single column can be described by the Maxwell-Stefan equations.
      
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In this paper a method of three-dimensional structural analysis of curved elevated bridge with thin-walled section has been developed, which is based on the stiffness matrix formulation of a spatially curved, thin-walled beam element and a computational method for the equivalent space nodal forces, derived by the warping torion theory of curved thin-walled girder. The approach proposed herein can be used to calculate the internal forces and displacements of curved elevated bridges under different conditions,...

In this paper a method of three-dimensional structural analysis of curved elevated bridge with thin-walled section has been developed, which is based on the stiffness matrix formulation of a spatially curved, thin-walled beam element and a computational method for the equivalent space nodal forces, derived by the warping torion theory of curved thin-walled girder. The approach proposed herein can be used to calculate the internal forces and displacements of curved elevated bridges under different conditions, such as linear bearing of torsional restraint disposed either perpendicularly or obliquely to the ourved longitudinal axis, intermediate support with a single column of torsional unrestraint, presence of an eccentricity at a support, etc.. Numerical examples are given for a skew, curved elevated bridge. The effects of support inclination and warping stiffness on the magnitudes of the internal forces and displacements both for open and for closed sections of this bridge have been studied.

本文在根据薄壁曲线梁翘曲扭转理论推导出的薄壁断面曲线粱单元空间刚度矩阵和各类荷载作用下空间等效节点力计算方法的基础上,提出了用刚度法进行曲线高架桥的空间结构分析方法,它可以用来计算正交抗扭线性支承、斜交抗扭线性支承、独柱式点支承以及支座预偏心等不同支座条件下的曲线高架桥的内力和变形,并可考虑桥墩对梁部结构的影响。文末通过对二跨斜支承曲线高架桥的计算实例,探讨了在均布荷载(自重)作用下支座偏角及翘曲对结构变形和内力的影响。

Based on the design of Longchi Overpass Bridge near Nanjingarea, some key tecknical problems concerning the prestrssed concrete curvedbox girder design are highlighted in the paper including the XLY programdeveloped for inputing the parameters automately and efficiently; the SAP5adopted for analyzing the diaphragms and trasversive distribution factorsand the QJX program used for prestressing tendon adjustments. Single-column piers of steel pipe concrete and spherical bearing are designed to suitthe...

Based on the design of Longchi Overpass Bridge near Nanjingarea, some key tecknical problems concerning the prestrssed concrete curvedbox girder design are highlighted in the paper including the XLY programdeveloped for inputing the parameters automately and efficiently; the SAP5adopted for analyzing the diaphragms and trasversive distribution factorsand the QJX program used for prestressing tendon adjustments. Single-column piers of steel pipe concrete and spherical bearing are designed to suitthe visual field requirments of an urban overpass bridge.

本文论述位于宁连(南京—连云港)一级公路上的南京龙池镇龙池立交桥的一些关键技术问题。编制XLY程序,对各匝道曲线线型及几何参数进行高效快速计算;采用SAP5程序对弯箱梁的横向分布横隔板作用及独柱偏心影响进行分析,采用QJX综合程序进行预应力配束分析。此外将独柱设计成钢管混凝土柱并采用新型支座——球形支座,使弯桥受力合理,桥梁线型流畅,通行视野开阔。

This article, follow the example of Longchi Interchange in Nanjing on the Jingsu-Ningyang first class highway analises the forced stateand internal stress regular pa-tern about prestressecl concrete bridge with curved, slope and skew character. In accordance with the character of city's bridge, a continuous beam with four spans (21m + 2 × 35m + 21m) was designed to a single box with tow rooms prestressed curved box girder supported by single columnpier and divid -ed box girder into three I - beams and...

This article, follow the example of Longchi Interchange in Nanjing on the Jingsu-Ningyang first class highway analises the forced stateand internal stress regular pa-tern about prestressecl concrete bridge with curved, slope and skew character. In accordance with the character of city's bridge, a continuous beam with four spans (21m + 2 × 35m + 21m) was designed to a single box with tow rooms prestressed curved box girder supported by single columnpier and divid -ed box girder into three I - beams and adopted SAP5 to de-termine the Living load distribution coefficient. In order to move eccentricity position of single column, move the supporting position 5cm outward The single column adopts pipe con-crete and domestic new product the globular bearing.

本文以江苏宁扬一级公路上的南京龙池立交桥为对象,分析了具有弯、坡、斜特征的预应力混凝土桥的受力状况和内力变化规律。结合城市桥梁的特点,将其中一联四跨(21m+2×35m+21m)设计成了独柱支承的单箱双室预应力弯箱梁。将箱梁划分成三个工字梁,用SAP5确定每片工字梁的活载分配系数。为调整独柱的偏心位置以抵消较大的扭矩,将独柱支承位置向外偏离5cm。独柱采用钢管混凝土和国内科研新产品—球型支座。

 
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