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多孔简支梁虽有施工方便,架设迅速,可以标准化预制等优点,但由于有许多伸缩缝存在,乃致行车不舒适,养路工作困难。若改成连续梁体系,则施工较难,加之超静定结构不仅对地基沉降敏感,而且混凝土徐变与日照温差的影响都很大,计算复杂,配筋增多。因此近十余年来国外改用连接板,即将各孔简支梁的桥面板或者铺装层连在一起(如图1),而不让它发生连续梁的支点负弯矩,使其成为“桥面连续简支梁”体系,从而兼收双方优点,避免双方缺点,颇受使用者与养路者的欢迎。
Although the porous simply supported beam has the advantages of convenient construction, rapid erection and standardization of prefabrication, it is difficult to maintain the road because of the many inconveniences caused by the existence of many expansion joints. If the continuous beam system is changed, the construction is more difficult. In addition, the statically indeterminate structure is not only sensitive to foundation settlement, but also the influence of concrete creep and sunshine temperature difference is very large. Computational complexity and reinforcement increase. Therefore, over the past ten years, the switch to the connecting plate abroad, that is, the hole simply supported beam bridge deck or pavement layer together (Figure 1), without allowing it to occur continuous beam negative pivot moments, making it “Deck of continuous simply supported beam” system, which combines the advantages of both sides, to avoid the shortcomings of both parties, popular users and road-keeping welcome.