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Home > Study of Energy Dissipation Capacity of Rc Bridge Columns under Seismic Demand

Study of Energy Dissipation Capacity of Rc Bridge Columns under Seismic Demand

Thesis Info

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Author

Syed Mohammad Ali

Program

PhD

Institute

University of Engineering and Technology

City

Peshawar

Province

KPK

Country

Pakistan

Thesis Completing Year

2009

Thesis Completion Status

Completed

Subject

Civil engineering

Language

English

Link

http://prr.hec.gov.pk/jspui/handle/123456789/171

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676727840465

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Field studies were carried out to investigate various parameters of bridges found in northern part of Pakistan. After the large Kashmir earthquake of M w7.6 in 2005, detailed field investigations to study the seismic performance of bridges was also undertaken. A mathematical function to define the functionality of bridges was developed which is helpful for quantifying the seismic resilience of bridges. Criterion for minimum required functionality for different bridges and limit states were defined for extremely large rare earthquake and for moderate occasional earthquakes. From the field data, typical parameters of reinforced concrete bridges were established. A series of experimental studies were undertaken in the laboratory on four scaled models of a typical bridge that consists of pier having single column. The pier column was of low strength concrete with solid circular cross section. The objective of the study was to experimentally determine the energy dissipation capacity of low strength concrete piers. Two types of tests were done on the four bridge piers: quasi-static cyclic tests and free vibration tests before, during and after the quasi-static tests. From the experimental results on four scaled low strength bridge piers damping was seen to decrease with increase in damage, natural period of piers doubled near failure, energy degradation was seen to be more in low strength piers. Energy based strength degradation and pinching is predominant in low strength concrete piers along with large permanent deformations. Response modification (R) factors based on natural period of bridge are found to better represent the energy dissipation and are accordingly proposed. The values of R-factor calculated for low strength concrete piers are lower than AASHTO LRFD 2007 thus more conservative. The fragility curves plotted for the bridge columns indicate that for peak ground accelerations (PGA) of seismic Zone 3 and above of the seismic hazard map of Pakistan (for 475-years return period) pushes the bridge in to damage state that is allowed for large earthquakes only (with return period of 2,500 years). Mathematical function for the quantification of seismic resilience of bridges is proposed for the first time. It is demonstrated that using the general guidelines of AASHTO LRFD 2007 quantification of seismic resilience is possible.
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۔حکیم محمد صادق سیالکوٹی ؒکی اردو سیرت ’’جمالِ مصطفیؐ‘‘کا تعارف وجائزہ

حکیم محمد صادق سیالکوٹی ؒکی اردو سیرت ’’جمالِ مصطفی‘‘کا تعارف وجائزہ

ڈاکٹر محمد انصر جاوید گھمن

 اردو سیرت  کی کتاب "جمالِ مصطفیﷺ"مولاناحکیم محمدصاد ق سیالکوٹی رحمہ اللہ کی ایک مشہور تصنیف ہے ۔ یہ کتاب نعمانی کتب خانہ حق سٹریٹ اردوبازار، لاہورسے چھپی ہے ۔اس کتاب کا  سرورق بہت زیادہ خوبصورتی سے مزین کیاگیاہے، جس کی ابتدااللہ تعالیٰ کے ارشادِ پاک "اور ہم نے آپﷺ کو سب جہانوں کے لیے رحمت بناکربھیجاہے۔"کے ساتھ درج ذیل شعر سے کی گئی ہے:

سیلاب رنگ و نور طلوع سحر میں ہے                تابندہ کہکشاں تیر گر سفر میں ہے

 حکیم صاحب اپنی کتاب کا تعارف  ان الفاظ میں کرواتے ہیں:

"اس کتاب میں آرامِ جاں، سکون ایمان، کاشفِ سرکن فکان، دلدارِ مسکان، غم خوارِ عاصیاں، ممدوحِ قُدْسَیاں، سرخیلِ نوریاں، رحمتِ عالمیاں، سید الکونین، سید الثقلین، حبیبِ خدا، اشرف الانبیاء، شافعِ روزِ جزاء، حضرت محمد مصطفیﷺکا حسن صحیح معنوں میں اپنی راعنائیوں کے ساتھ جلوہ بار ہے۔"

 مولانا حکیم محمد صادق سیالکوٹی رحمہ اللہ نے حسنِ صورت بھی بیان کیاہے اور حسنِ سیرت بھی بیان کیاہے۔ حکیم صاحب نے مندرجہ بالا القابات جو بیان کیے ہیں در حقیقت یہ رسول اللہﷺ کی سیرت کے مختلف پہلو ہیں جو حکیم صاحب نے بڑے حکیمانہ انداز میں بیان فرمائے ہیں۔ پھرحکیم صاحب نبیﷺ کی سیرت کو اشعارکی صورت میں بیان کرتےہیں اور آفتابِ نبوت میں آفتابِ کردار کو نمایاں کرتے ہیں۔جن میں سے چند حسب ذیل ہیں:

نگاہ برق نہیں چہرہ آفتاب نہیں

وہ آدمی ہے مگر دیکھنے کی تاب نہیں

کہکشاں ہے تیرے اہرار مقدس کا غبار

تیرے نقش پا ہیں فردوس بریں کے لالہ زار

 حکیم صاحب...

PENDIDIKAN AGAMA ISLAM (PAI) MULTIKULTURAL PERSPEKTIF PEMBELAJARAN INTEGRATIF

Tulisan ini mengkaji tentang PAI multikultural sebagai model pembelajaran integratif yang memadukan antara ilmu pengetahuan dan agama. Dari aspek konten, multikulturalisme mengkaji keragaman bangsa, suku, warna kulit, bahasa, agama dan keragaman lain yang terbentang dalam realitas sosial kehidupan manusia sebagai ayat-ayat Allah yang bersifat kauniyah. Sedangkan PAI mempelajari normativitas ajaran Islam dan dimensi historis yang banyak termuat dalam al-Qur’an sebagai ayat-ayat Allah yang bersifat qauliyah. Pembelajaran kedua bidang keilmuan tersebut sama-sama sebagai proses pencarian kebenaran yang merujuk kepada Allah sebagai episentrum kebenaran Hakiki dan sumber ilmu pengetahuan. Dari konsep pembelajaran integratif yang dikemukakan pemikir Islam dan Barat, PAI multikultural berada pada pola relasi antardispliner, yaitu integrasi antara ilmu umum dan ilmu agama. PAI multikultural sebagai pembelajaran integratif tergambar pada aspek: tujuan, materi, metode, media dan sumber belajar dan penilaian yang saling terintegrasi dalam membentuk kompetensi beragama peserta didik secara integral, yaitu: keterpaduan antara unsur duniawi dan ukhrawi, antara dimensi spritual dan intelektual, antara ranah personal dan sosial dalam konteks membangun harmoni kehidupan warga sekolah, masyarakat dan bangsa Indonesia yang pluralistik dari segala aspeknya.

Performance Evaluation of Rc Structures under Earthquake Loading

Existing seismic risk in Pakistan, especially in its Northern Areas, emphasis for a detailed and careful design of RC structures to withstand expected earthquake loads. The seismic performance of RC multistory structures is a complex process. An accurate assessment of seismic behavior of RC structures requires an analysis carried out under time history or parameters of time history of real time recorded earthquakes. In Pakistan, a large data bank of strong motion recorders exists in analog form, and its use in performance assessment of structures is very difficult without digitizing it. The response of a multistory RC building is greatly dependant on performance of its columns especially in inelastic range, which can be improved by providing sufficient confinement. Post earthquake surveys revealed that most of the RC buildings collapsed due to insufficient performance of their columns, which were found deficient in confinement. A limited work has been carried out in Pakistan to study the performance of RC columns under axial and lateral loading. Internationally, the efforts are continued to enhance the performance of RC columns subjected to seismic loads. The objective of this research has three main parts. The first part is to collect, segregate and digitize available analog form of earthquake data, which has been recorded in Pakistan. The second part is to device and test a technique which could enhance strength, ductility and stiffness of RC columns subjected to seismic loads and result in lesser residual deformations. The third part is to carry out seismic analysis of a RC multistory frame, using material behavior studied experimentally, under application of ground motion data of Pakistan. A novel digitizing technique is developed in this study that extracts the trace of recorded acceleration as a whole by saving all points required to draw digitized ground acceleration. The proposed digitizing approach has been compared with the available techniques to assess its efficiency. The confinement technique for RC columns developed in this study utilizes specialized rings of steel strips applied as transverse reinforcement in hinge zone. Eight large scale specimens have been cast and tested to study the performance of proposed technique. The experimental results indicated that proposed confining reinforcement, although with lesser volumetric ratio, improved the performance of RC columns by enhancing their shear resistance, ductility, energy dissipation capacity and reducing residual deformations. iiThe columns confined by proposed technique have been named as Steel Strip Confined (SSC) columns. The observed column behavior has been modeled in Response-2000 and DRAIN-3DX. RC frames are modeled in DRAIN-3DX using material properties calibrated with experimental data. The frames are analyzed under north-south component of El Centro ground motion and east-west component of Kashmir earthquake recorded at Abbottabad. The frames, modeled with properties of SSC columns, showed better performance by reducing the damage. The analysis indicates that Kashmir earthquake is more damaging in nature than El Centro ground motion.