Multimodal Response Spectrum Method Analysis of Integral Abutment Curved Box Girder Bridge
In order to simplify analysis of the dynamic characteristics and seismic response of the integral abutment curved box bridge(IACBB), automatic iteration of the multimode modal response spectrum(MMRS) is realized by APDL language of the structure analysis software ANSYS according to the IACBB's structural characteristics. The realization flow of iterative MMRS in Ansys were presented. and the availability and precision of the iterative MMRS were examined by the time-history analysis. The result shows that 1）the iterative MMRS is a efficient simplify method, and can be used as an estimating method of seismic analysis for the bridge. And the method provides a reference for future similar structures. 2）several conclusions of earthquake response are given. The research results are helpful for the knowledge of mechanics property of the type of the bridges.
STATE-OF-THE-ART OF INTEGRAL ABUTMENT BRIDGES: DESIGN AND PRACTICE
The superstructure for integral abutment bridges is cast integrally with abutments that are supported by a single row of piles. Thermal expansion or contraction and concrete creep and shrinkage induce bending stresses in the piles. Very limited design and construction guidelines are available and no unified design procedures exist nationwide; hence, there is a lack of enthusiasm to adopt integral abutment bridges for long spans. Current design and construction practices of integral abutment bridges have been reviewed. Important design parameters are identified with an emphasis on temperature, creep, and shrinkage effects of concrete bridge decks, varying soil strata, and the pile-soil interaction. A parametric study is described regarding the effects of a predrilled hole, the type of fill in the predrilled hole, elevation of the water table, soil type, and pile orientation. The results from the parametric study should aid in the selection and design of piles for integral abutment bridges.
Design of seismic isolated structures : from theory to practice
Development of Seismic Isolation Worldwide. Theoretical Basis of Seismic Isolation. Isolation System Components. Code Provisions for Seismic Isolation. Mechanical Characteristics and Modeling of Isolators. Buckling and Stability of Elastomeric Isolators. Design Earthquake Ground Motions. Design Examples. Computer Applications. Specifications for Design, Manufacturing, and Testing of Isolation Devices. Appendix. References. Index.