And the design approach of widening bridge and culvert is studied and summarized.
分别对桥梁加宽和通道、涵洞加长的设计方法进行了研究、总结，并提出了设计程序。
The design approach in new published criteria for seismic design of bridge is comparative in some aspect with abroad code, but more improvement is necessary.
新颁布的桥梁抗震设计细则设计方法与国外的桥梁抗震设计方法已经比较接近，但需要进一步改进。
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