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    THẠC SĨ Seismic pounding effects in buildings

    Quy Ẩn Giang Hồ Quy Ẩn Giang Hồ Đang Ngoại tuyến (956 tài liệu)
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  6. Seismic pounding effects in buildings

    SEISMIC POUNDING EFFECTS IN BUILDINGS
    A THESIS SUBMITTED IN
    PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR
    THE DEGREE OF
    BACHELOR OF TECHNOLOGY
    IN
    CIVIL ENGINEERING
    By
    ISHAN JYOTI SHARMA
    ROLL NO-10401029
    ABSTRACT
    Major seismic events during the past decade such as those that have occurred in
    Northridge, Imperial Valley (May 18, 1940), California (1994), Kobe, Japan (1995),
    Turkey (1999), Taiwan (1999) and Bhuj, Central Western India (2001) have
    continued to demonstrate the destructive power of earthquakes, with destruction of
    engineered buildings, bridges, industrial and port facilities as well as giving rise to
    great economic losses. Among the possible structural damages, seismic induced
    pounding has been commonly observed in several earthquakes. As a result, a
    parametric study on buildings pounding response as well as proper seismic hazard
    mitigation practice for adjacent buildings is carried out. Therefore, the needs to
    improve seismic performance of the built environment through the development of
    performance-oriented procedures have been developed. To estimate the seismic
    demands, nonlinearities in the structure are to be considered when the structure enters
    into inelastic range during devastating earthquakes. Despite the increase in the
    accuracy and efficiency of the computational tools related to dynamic inelastic
    analysis, engineers tend to adopt simplified non-linear static procedures instead of
    rigorous non-linear dynamic analysis when evaluating seismic demands. This is due
    to the problems related to its complexities and suitability for practical design
    applications. The push over analysis is a static, nonlinear procedure that can be used
    to estimate the dynamic needs imposed on a structure by earthquake ground motions.
    This project entitled “Seismic Pounding Effects in Buildings.” aims at
    studying seismic gap between adjacent buildings by dynamic and pushover analysis
    in SAP2000. A parametric study is conducted to investigate the minimum seismic
    pounding gap between two adjacent structures by response Spectrum analysis for
    medium soil and Elcentro Earthquake recorded excitation are used for input in the
    dynamic analysis on different models The effect of impact is studied using linear
    and nonlinear contact force on models for different separation distances and
    compared with nominal model without pounding consideration. Pounding produces
    acceleration and shear at various story levels that are greater than those obtained
    from the no pounding case, while the peak drift depends on the input excitation
    characteristics. Also, increasing gap width is likely to be effective when the
    separation is sufficiently wide practically to eliminate contact. The results of
    pushover analysis viz. pushover curves and capacity spectrum for three different
    lateral load patterns are observed to study the effect of different lateral load pattern on
    the structural displacement to find out minimum seismic gap between buildings.

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