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首页> 外文期刊>HBRC Journal >Assessment of vehicular live load and load factors for design of short-span bridges according to the new Egyptian Code
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Assessment of vehicular live load and load factors for design of short-span bridges according to the new Egyptian Code

机译：根据新的埃及法规评估短跨度桥梁的车辆活载和载重系数

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The new Egyptian Code (ECP-201:2012) introduces new vehicular live loads (VLL) and new load combinations for the design of roadway bridges. The new VLL and load combinations introduced in ECP-201:2012 are fundamentally different than those presented in previous versions of the code. The impact of these new loads and load combinations on the design of new bridges or the structural safety of the existing bridges that have been designed according to ECP-201:2003 or ECP-201:1993 has not been fully addressed for the different bridge deck systems. Three different bridge deck systems, i.e. concrete I-shaped girders, composite steel plate girders, and concrete box-girders with different spans were numerically modeled using two-dimensional grillage analogy. The bridge decks were analyzed under main gravity loads using VLL according to ECP-201:2012 and ECP-201:2003. The internal forces of individual load cases, total un-factored load combination, and total factored load combination of ECP-201:2012 and ECP-201:2003 were compared. The study shows that concrete box-girders designed according to ECP-201:2012 and ECP-201:2003 using the ultimate limit state method yield almost the same demand. Despite the increase in the VLL of ECP-201:2012, and consequently the live load forces, concrete I-shaped girder bridges will be subjected to less total factored internal forces in comparison to ECP-201:2003 This is attributed to the interaction between the live to dead loads ratio and the load combinations. Design of composite steel plate girder bridges according to ECP-201:2012 using the allowable stress design method yields over designed sections.
机译：新的埃及法规（ECP-201：2012）引入了新的车辆活荷载（VLL）和用于道路桥梁设计的新荷载组合。 ECP-201：2012中引入的新VLL和负载组合与以前版本的代码中存在的根本不同。这些新的荷载和荷载组合对新桥的设计或根据ECP-201：2003或ECP-201：1993设计的现有桥梁的结构安全性的影响尚未针对不同的桥面板得到充分解决系统。使用二维格栅类比，对三种不同的桥面系统，即混凝土工字形梁，复合钢板梁和跨距不同的混凝土箱形梁进行了数值建模。根据ECP-201：2012和ECP-201：2003，使用VLL在主重力载荷下对桥面板进行了分析。比较了个别情况，ECP-201：2012和ECP-201：2003的总非因式荷载组合以及总因式荷载组合的内力。研究表明，根据ECP-201：2012和ECP-201：2003使用极限极限状态方法设计的混凝土箱梁产生的需求几乎相同。尽管ECP-201：2012的VLL有所增加，因此活载力有所提高，但与ECP-201：2003相比，混凝土I形大梁桥所承受的总分形内力要小一些。活载与静载之比和荷载组合。根据允许应力设计方法，根据ECP-201：2012进行的复合钢板梁桥设计在设计截面上产生。

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