Developing a Computer Program for the Methods of Radius-Estimating Techniques for Horizontal Curves | Science Publications

American Journal of Engineering and Applied Sciences

Fatin Janan¹  Asma T. Ibraheem¹ 

关键词: Geometric design;    horizontal alignment;    surveying;    transportation;    Global Positioning System (GPS);    horizontal curves;    spiral;    chord length;    plan sheet;    compass;    visual basic language;    lateral acceleration;    radius;   

DOI  :  10.3844/ajeassp.2011.276.287

学科分类：工程和技术（综合）

来源: Science Publications

【 摘 要 】

Problem statement: This study discusses the development of computer software of twophases. First phase contains the calculations of all curve elements of the four types of the horizontalcurve and second phase contains the modeling of the ten methods of estimating the radius of thehorizontal curve. Approach: The program is named as HCRET, which stands for Horizontal Curvesand Radius Estimating Techniques. The program is written in Visual Basic-Version 6 language. Thedeveloped program deals with the calculation of all elements of the horizontal curve of the four typesof the horizontal curves, which consists of simple, compound, reverse and transition. Results: Theprogram also used for modeling of the ten methods of radius-estimating of horizontal curve, whichconsist of Ball Bank Indicator, Chord Length, Compass, Lateral Acceleration, Plan Sheet, AdvisorySpeed Plate, Modified Yaw Rate, Field Survey, and Global Positioning System for the calculation ofestimated-radius. The program output is comprehensive and easy to understand, while the programinput is used friendly and provided with many graphical objects to facilitate ease of use. A case studyof three examples presented to evaluate the modeled software of three horizontal curves. Two curveswere located in university of Baghdad and a third curve was designed and includes also theexperimental work of radius-estimating methods of horizontal curves as follow field survey, plansheet, compass, Global Positioning System (GPS). Conclusion/Recommendations: The results thatobtained of the three curves by using the radius-estimating methods include the true and estimatedradius of each method. The field survey and the plan sheet method provided the most accurate result0.8002 and 0.8660 respectively. The plan sheet method and GPS method is preferred, because plansheets are easily accessible to these users and GPS is the accurate field method. While the compassmethod is not the accurate, it is easy to use, and has a low cost.

【 授权许可】

Unknown