PENGEMBANGAN SPEKTRA RESPONS DARI GEMPA RIWAYAT WAKTU PALU 2018

Abstract

Indonesia is at the summit of three world plates – the Indonesian plate – Australia, the Eurasian plate, and the Pacific plate, so the earthquake activity that occurs in Indonesia is quite high. On Friday, September 28, 2018, at 18:02 WITA there was an earthquake that shook Palu M 7.4 and a depth of 10 km.

This study aims to build a response spectrum from the 2018 Timeline Earthquake. The maximum spectral values of the vibration are obtained at each vibration period value of the T structure and then imploted into such a vibration spectrum, indicating that the beginning of the production of the response spectrum begins with the calculation of the angular velocities and periods of vibration of w_i and T_i on the information of the behavior of k_i and m_i masses. The numerical method of the Central Difference uses an approach to the derivative value of a time function or a derivative of the time movement, both for velocity parameters and acceleration parameters. The SDOF response consists of a two-dimensional structure analysis by inserting the parameters of the Palu Response Spectrum 2018 with the help of a program to determine how the SDOF Response is.

Development of the displacement response spectrum HNE 160,60 cm T2,98 sec, HNN 230,09 cm T4,69 sec, and HNZ 94.43 cm T4,97 sec. Velocity HNE maximum 335,79 cm/d T2,98 seconds, HNN 307.30 cm/de T4,69 sec, and HNZ 143,98 cm/sec T2,11 sec. Acceleration HNE 1480 cm/det² T0,23 seconds; 1850 cm/det² T 0,38 sec and HNZ 3773 cm/sec² 0,12 sec.