توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱THE ANALYSIS OF FLEXIBLE CONCRETE FOUNDATIONS ON COARSE ALLUVIUM OF TEHRAN
نویسنده(ها): ،
اطلاعات انتشار: سومین کنفرانس بین المللی بتن و توسعه، سال
تعداد صفحات: ۱۰
Regarding the increasing expansion of construction in Tehran, the design and construction of raft or grid concrete foundations are very common for tall buildings. Winckler springs are often used by professionals to model soils in the design of flexible concrete foundation. However, it presents a substantial problem because the Winckler springs are not coupled. Such a subgrade reaction theory is too simplified, i.e. it considers a fixed constant value for the stiffness of Winckler springs which leads to an incorrect design. Continuum mechanics theory and numerical simulation tools are available to be used for soil modeling but they are time consuming and most engineers prefer to use Winckler springs to model the soil. In the presented research, a computer program was firstly developed based on
finite elements method. It could model a flexible foundation on springs but the springs are coupled by considering stress distribution within soil mass. The used method is very similar to Winckler springs model and tries to modify it. The method is employed for different geological formations in Tehran to show the effects of the properties of coarse alluvium of Tehran on the analysis of concrete foundations.<\div>

۲IMPROVEMENT OF SEISMIC PERFORMANCE OF WHARVES INCLUDING BATTER PILES
نویسنده(ها): ، ،
اطلاعات انتشار: ششمین کنفرانس بین المللی زلزله شناسی و مهندسی زلزله، سال
تعداد صفحات: ۸
Pile supported deck systems are prevalent structural system for wharves and piers. Pile groups are often required to support loads applied perpendicular to their longitudinal axes. Lateral load resistance is independent of axial effects. However, high axial compression and lateral displacements may interact with together and increase lateral displacements, bending moments and shear forces. In seismically active regions, batter piles are installed to support the horizontal loads by a component of the axial pile–soil resistance in addition to the lateral resistance ofpiles. Several case studies show that batter piles head connections may be overstressed if the pile group is not designed using an appropriate method. Batter piles tend to attract significantly larger earthquake loads than vertical piles. Therefore, specific considerations are required for the design of batter piles. Based upon a nonlinear soil–structure interaction analysis, the presented paper discusses the role of batter piles in the seismic performance of wharves. Because the earthquake loads transmitted to the batter piles could be very large, a structural fuse is introduced. The fuse allows plastic yielding of the batter pile head connection to be transmitted to it. In this scheme, damages due to earthquake are concentrated in this replaceable member and amendment difficulties are minimized. Finally, a sample wharf with batter piles and the introduced structural fuse is examined. A nonlinear static analysis is applied and the performance of this structural fuse against earthquake loads is evaluated. The presented paper concludes the introduced structural fuses could improve the seismic performance of batter piles in wharves.<\div>
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