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ITS » Master Theses » Teknik Struktur S2
Posted by dewi007 at 14/11/2008 11:46:36  •  11490 Views


EFEKTIFITAS PENGEKANGAN FINE MESH PADA KOLOM BULAT BETON BERTULANG

CONFINEMENT EFFECTIVENESS WITH FINE MESH ON CIRCULAR REINFORCED CONCRETE COLUMN

Author :
Manaha, Yosimson Petrus 




ABSTRAK

Keruntuhan bangunan yang terjadi banyak disebabkan oleh kegagalan struktur memikul beban gempa terutama elemen struktur kolom. Faktor yang mengakibatkan kegagalan kolom antara lain perancangan kolom yang tidak memperhitungkan daktilitas atau pengekangan detailing kolom yang kurang baik sehingga kinerja kolom tersebut menurun dari yang direncanakan selain itu perencana masih mengabaikan konsep Strong Columns Weak Beams. Salah satu cara untuk meningkatkan daktilitas kolom pada struktur gedung lama adalah meretrofit kolom tersebut dengan cara meliliti kolom menggunakan tulangan transversal yang berfungsi sebagai tulangan pengekang. Namun pada penelitian ini akan dikaji apakah fungsi tulangan transversal sebagai tulangan pengekang mungkin digantikan oleh Fine Mesh FM. Parameter kunci yang diteliti dalam penelitian ini adalah f cc cc dan cu . Permasalahan yang perlu diteliti adalah kedua parameter itu dibutuhkan untuk mempertahankan kinerja kolom terhadap beban siklik gempa yang lebih besar dari beban gempa nominal. Untuk memverifikasi peningkatan efektifitas seperti yang diprediksi melalui pendekatan analisis maka dilakukan uji eksperimental . Pengujian eksperimental tersebut memakai benda uji kolom bulat diameter 250 mm dengan empat tipe kolom yaitu kolom beton polos CCP kolom beton terkekang fine mesh CCFM kolom beton terkekang tulangan spiral BJTP CCS dan kolom beton terkekang tulangan spiral BJTP yang dibungkus fine mesh CCFMS. Hasil penelitian yang diperoleh dibandingkan dengan hasil analisis teoritis berdasarkan hubungan tegangan-regangan beton terkekang yang dikembangkan oleh Mander dkk. dapat disimpulkan bahwa fine mesh cukup efektif bilamana digunakan sebagai tulangan pengekang pada kolom beton dalam arti meningkatkan daktilitas beton. Ini dibuktikan fine mesh pada kolom beton terkekang tulangan spiral yang dibungkus lagi oleh fine mesh CCFMS memberi efektifitas pengekangan yang setara dengan kolom beton terkekang tulangan spiral BJTP CCS dengan perbedaa n rasio tulangan transversal s 1323 kuat tekan cc f berbeda 594 regangan beton terkekang cc berbeda 335 dan regangan beton ultimit cu berbeda 268 . Sebaiknya kolom beton yang belum dirancang memikul beban gempa dapat diretrofit menggunakan fine mesh agar dapat meningkatkan daktilitas dari kolom tersebut.


ABSTRACT

Many of building collapse due to the structural failure in resisting the earthquake loading paticularly in column members. Factors that resulting failure of column i.e. design of column that does not consider the ductility or confinement unfavourable column detailing. These may cause column performance decreased beside many designers still do not the Strong Columns Weak Beams concept. One way to increase column ductility in the building is by retrofitting the existing column with around the column using transversal bars which is functioning as confinement bars. This research investigated will be discussed is the possibility fine mesh as confinement bars replacing the conventional transversal reinforcement bars. Key parameters this research are f cc cc and cu . This key parameters is required that need to be observed is both parameters required to maintain column performance to earthquake under cyclic loading larger than nominal design earthquake loading. To verify the effectiveness stress-strain increase as predicted through analytical approach experimental test is conducted. The test compressive uses circular column with diameter 250 mm and high 800 mm. The four column specimens types are plain concrete column CCP confined concrete column with fine mesh CCFM confined concrete column with smooth spiral bars CCS and confined concrete column with smooth spiral bars and wrapped by fine mesh CCFMS. The result of research obtained is then compared with the theoritical analytical result based on stress-strain confined concrete developed by Mander and et.al. it is concluded that fine mesh is sufficiently effective when used as confinement concrete column is can increase the ductility of the column. From the investigation it is shown that column CCFMS s 002027 provided confinement effectiveness equivalent to column CCS s 002328. The difference for both column in compressive strength fcc is 5.94 confined concrete strain cc is 3.35 and ultimate concrete strain cu is 2.68 . For concrete column is not designed considering earthquake loading can be retrofitted using fine mesh because fine mesh can increase ductility of the column.



KeywordsTulangan transversal; daktilitas; fine mesh; kolom beton bertulang; kuat tekan beton; pengekangan; regangan beton
 
Subject:  beton bertulang
Contributor
  1. Prof. Ir. Rachmat Purwono, M.Sc
    Tavio, ST, MT., PhD
Date Create: 14/11/2008
Type: Text
Format: pdf.
Language: Indonesian
Identifier: ITS-Master-3100008031403
Collection ID: 3100008031403
Call Number: RTS 624.183 41 Man e


Source
Master Theses, SUB DEPARTMENT OF STRUCTURE DEPARTMENT OF CIVIL ENGINEEERING, RTS 624.183 41 Man e, 2008

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