Abstract
Cable is the main element in a long span structure and is often used for special structures such as long span bridges, roofs and other structures that require a long span. The stiffness of the cable is determined by the amount of axial tensile force acting on the cable, and hence, the magnitude of the actual tensile force on the cable is an important factor to be determined and monitored. One simple method for determining the actual tensile force on a cable is to calculate the tensile force from the first natural frequency of the cable. However, it is important to ensure that the formulas used to calculate the tensile force are accurate. This research aims to determine the level of accuracy and the factors that influence the accuracy of the formula to determine the tension force of the cable from the natural frequency value of the cable. The methodology used in this research project was by applying free vibrations to the cable with given axial tensile load and measuring the acceleration that occurred with an accelerometer sensor. By using Fast Fourier Transform (FFT), the natural frequency value of the cable can be calculated and the actual tensile strength in the cable can be determined. From the experiment conducted, it was found that the length of the cable affects the accuracy of the measurement of the natural frequency and the magnitude of tensile force of the cable. The strain that occurs on the cable plays a very important role to the accuracy of the formulas used.
Highlights
Cables are elements that are often used in building structures and bridges
This research aims to determine the level of accuracy and the factors that influence the accuracy of the formula to determine the tension force of the cable from the natural frequency value of the cable
In the case of structures with cable elements, monitoring of the tensile forces in the cable needs to be done periodically, and if Revised Manuscript Received on December 30, 2019. * Correspondence Author Made Suangga*, Civil Engineering Department, Bina Nusantara
Summary
Cables are elements that are often used in building structures and bridges. Cables are widely used in the tied-arch bridges and suspension bridges as the major elements to transfer loads from the deck to the arch or pylon. The cable has a very unique characteristic where the stiffness of the cable is determined by the amount of axial tensile force acting on the cable. Monitoring the structure's condition is an activity that must be conducted to ensure that the structure is in a safe condition. The monitoring process is carried out by measuring the stiffness of the structure. In the case of structures with cable elements, monitoring of the tensile forces in the cable needs to be done periodically, and if Revised Manuscript Received on December 30, 2019. * Correspondence Author Made Suangga*, Civil Engineering Department, Bina Nusantara In the case of structures with cable elements, monitoring of the tensile forces in the cable needs to be done periodically, and if Revised Manuscript Received on December 30, 2019. * Correspondence Author Made Suangga*, Civil Engineering Department, Bina Nusantara
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