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1·Study on the vertical prestress loss of the prestress concrete box girder bridge web;

对混凝土箱梁腹板竖向预应力进行研究。

2·By test, we will know more about prestressed concrete semi-rigid frame continuous box girder bridge.

通过试验，使我们对于预应力混凝土半刚构-连续梁桥有了进一步的认识。

3·To some extent, the conclusions in this paper have a reference value on the box girder bridge design and construction.

本文所得出的结论在一定程度上对箱梁桥的设计和施工有参考意义。

4·The temperature field in box girder bridge will change constantly because of the effects of sunshine and atmospheric temperature difference.

主桥箱梁内部温度场由于受到气温、日照等因素变化的影响而不断发生变化。

5·On the basis of the mechanical behavior of box girders, the stress design method is brought forward against the PC box girder bridge cracking.

根据箱梁结构的受力特点，提出采用应力设计方法解决预应力混凝土箱梁的受力开裂问题。

6·In recent years, concrete continuous box girder bridge has been widely used at home and abroad, which has Attractive appearance, safe and reliable.

近年来，混凝土连续箱梁桥在国内为得到了广泛运用，造型美观，安全可靠。

7·However, box girder cracking and long-term midspan deflection are the defects which commonly exist in the long-span prestressed concrete box girder bridge.

但箱梁开裂与跨中下挠是目前大跨预应力混凝土箱梁桥中普遍存在的病害。

8·On basis of a prestressed concrete T-type rigid frame box girder bridge, the paper compares the advantages and disadvantages of different reinforcement options.

以某预应力混凝土T型刚构箱梁桥为背景，对采用不同加固方案的优缺点进行比选，最后从技术可行性和经济角度推荐采用碳纤维CFRP加固方案。

9·The essay deduces the formula of the high finite strip method analysis of the thin-walled curved box girder bridge and its program, then proves their correctness;

推导弯曲薄壁箱梁桥高阶有限条法分析的公式及程序，并验证其正确性。

10·Cracking is quite common in prestressed concrete continuous box girder bridge, which influences appearance of component, life span of using, and even safety of structure,.

预应力混凝土连续箱梁桥的开裂可以说是“多发病”，影响着构件的外观、使用寿命，甚至结构安全。