(For USM Staff/Student Only)

EngLib USM > Ω School of Civil Engineering >

Evaluation of structural pounding between adjacent buildings subjected to repeated ground motions / Mahmoud Ali Miari

Evaluation of the stiffness and strength parameters of hardening soil model for the simulation of the twin tunnels interaction in kenny hill formation residual soil_Lim Siaq Phin_A9_2017_MYMY
Kod semasa masih mempunyai beberapa kelemahan, di mana dua tenomena asas in tidak diambil kira: yang pertama ialah godaman struktur (keruntuhan antara struktur) yang berlaku jika jurang antara struktur tidak mencukupi dan Fenomena kedua ialah gempa bumi berulang, di mana tidak ada maklumat dalam kod yang berkaitan dengannya. Kajian ini menyiasat prestasi struktur antara bangunan bersebelahan yang mengalami godaman strutur opibilah dikenaksn pergerakan tanah yang berulang menggunakan analisis dinamik tambahan (IDA) dan kemudian menghasilkan graf kerapuhan untuk bangunan bersebelahan berdasarkan tahap prestasi yang berbeza. Bagi tujuan ini, sembilan model telah dianalisa. Setiap model mempunyai dua bingkai. Bangunan-bangunan ini dibahagikan kepada 3 gabungan: (1) dua bingkai teratur, (2) satu bingkai teratue dan satu bingkai tidak teratur dan (3) dua birgkai tidak teratur. Jurang (ruang antara struktur) juga dibahagikan kepada 3: 1 mm, 10 cm, dan 1 m bagi setiap gabungan. Dengan itu, kita mempunyai 3 kombinasi dan 3 jurang untuk setiap gabungan yang menjadikan jumlah semua model sebagai 9. Keputusan analisa membuktikan bahawa kerosakan struktur adalah berkadar terus dengan kekuatan pergerakan tanah dan ketidakteraturan struktur; sedangkan ia adalah berkadar songsang dengan jurang antara struktur. Oleh itu, 1 m ialah jurang yang terbaik untuk digunakan di kawan yang mingalami gempa bumi berulang untuk mengelakkan godaman struktur berbanding menggunakan jurang 10 cm and 1 mm. Selain itu, kerosakan utama bingkai berlaku dalam rasuk. Bagi bingkai teratur kerosakan utama berlaku pada tingkat bawah, manakala kerosakan bagi bingkai yang tidak teratur ialah di bahagian bawah dan di tingkat atas. Jadi, di kawasan-kawasan yang menglami gempa bumi yang kerap, kekukuhan yang lebih perlu diberikan kepada rasuk. Dalam kes ini pengukuhan, kekukuhan tambahan disyorkan untuk kedua-dua bangunan. Lokasi pengukuhan tambahan perlu ditempatkan pada rasuk yang terletak sama tinggi dengan ketinggian bangunan rendah, serta di atas dan di bawah rasuk tersebut, masing-masing. Berkenaan dengan tiang, kerosakan utama berlaku di tingkat bawah. Untuk itu, tiang yang lebih kukuh digunakan di tingkat bawah , terutama sekali pada aras tanah. _______________________________________________________________________ The current codes still have some drawbacks, where the following two basic phenomena are not taken into account: the first is structural pounding (collapse between the structures) which occurs if the gap between the structures is insufficient; and the second phenomenon is the repeated earthquakes, where there is no information in the codes related to it. This research investigates the structural performance (peak ground acceleration (PGA), drift, plastic hinges, and interstorey drift) of adjacent buildings experiencing structural pounding under the effect of moderate repeated ground motions using incremental dynamic analysis (IDA) and then develops the fragility curves for adjacent buildings based on different performance levels. For this purpose, nine models have been analyzed. Each model consists of two frames. The buildings are divided into 3 combinations: (1) two regular frames, (2) one regular frame and one irregular frame and (3) two irregular frames. The gap (space between the structures) is divided into 3 gaps: 1 mm, 10 cm, and 1 m for each combination. Thus, there are 3 combinations and 3 gaps for each combination which means a total of 9 models. Results of analysis prove that the damage of the structure is directly proportional to the intensity of the ground motion and the irregularity of the structure; whereas it is inversely proportional to the gap between the structures. Hence, 1 m is the best spacing to be used in areas that experience repeated earthquakes to avoid structural pounding in contrast with 10 cm and 1 mm. Also, the main damage of the frames is concentrated in the beams. For regular frames, the damage is concentrated in the bottom storeys, while the damage for irregular frames is concentrated at both bottom and top storeys. Therefore, in areas that experience repeated earthquakes, more stiffness should be given to the beams. In this case, the additional stiffness is recommended for both buildings. The location of the additional stiffness should be in the beams that corresponds to the height of the short building, the immediate above and the below beams, respectively. With respect to the columns, the damage is concentrated in the ground floor. For that, additional stiffness should be added to the columns in the bottom storeys, especially in the ground floor.
Contributor(s):
Mahmoud Ali Miari - Author
Primary Item Type:
Thesis
Identifiers:
Accession Number : 875008919
Language:
English
Subject Keywords:
insufficient; phenomenon; proportional
Sponsor - Description:
Pusat pengajian Kejuruteraan Awam -
First presented to the public:
6/1/2017
Original Publication Date:
10/1/2020
Previously Published By:
Universiti Sains Malaysia
Place Of Publication:
School of Civil Engineering
Citation:
Extents:
Number of Pages - 116
License Grantor / Date Granted:
  / ( View License )
Date Deposited
2020-10-01 15:23:52.29
Date Last Updated
2020-12-01 15:47:16.3
Submitter:
Mohamed Yunus Yusof

All Versions

Thumbnail Name Version Created Date
Evaluation of structural pounding between adjacent buildings subjected to repeated ground motions / Mahmoud Ali Miari1 2020-10-01 15:23:52.29