The originality of the thesis lies in : ( 1 ) establishment of analysis model for different design phases of multi - ribbed slab in accordance with the slab ' s grading and multimode failure mode , by felicitously assumption and affecting factor ' s evaluation , the computational model corresponding to codes " requirement is proposed ( 6 ) .实用设计方法的建立和完善通过中高层密肋壁板结构房屋的工程设计，结合其他结构体系的相关研究成果，初次建立了中高层密肋壁板结构房屋的概念设计原则和抗震计算方法。
Fem can simulate the actual situation of the existing bridges , and may be used into the internal force computation widely . the internal force analysis may provide the basis to choose the responsible strengthening scheme , which could be taken as reference by other existing construction . also , the planting reinforce bar technique could be applied to the strengthening structures 并认为：有限元分析方法能有效地模拟旧桥的实际情况，可广泛地用于危旧拱桥的内力计算；内力分析的结果可为确定合理的加固方案提供依据，二者结合对其他结构的加固有一定的参考价值；植筋技术可较好地应用于桥梁结构的维修加固工程中。
