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中文3700字，英文2600词
文件组成及目录
近年来，我国交通基础建设得到迅猛发展，各地兴建了大量的混凝土桥梁。在桥梁建造和使用过程中，有关因出现裂缝而影响工程质量甚至导桥梁垮塌的报道屡见不鲜。混凝土开裂可以说是“常发病”和“多发病”，经常困扰着桥梁工程技术人员。其实，如果采取一定的设计和施工措施，很多裂缝是可以克服和控制的。为了进一步加强对混凝土桥梁裂缝的认识，尽量避免工程中出现危害较大的裂缝，本文尽可能对混凝土桥梁裂缝的种类和产生的原因作较全面的分析、总结，以方便设计、施工找出控制裂缝的可行办法，达到防范于未然的作用。
实际上，混凝土结构裂缝的成因复杂而繁多，甚至多种因素相互影响，但每一条裂缝均有其产生的一种或几种主要原因。混凝土桥梁裂缝的种类，就其产生的原因，大致可划分如下几种：
In recent years, our country transportation infrastructure obtained the swift and violent development, each place has constructed the massive concrete bridge. In the bridge construction and the use process, concerns because of appears the crack but to affect the project quality even to lead the report common occurence which the bridge breaks down collapses. The concrete dehiscence may say is "often is taken bad" and "frequently-occurring disease", is puzzling the bridge building technical personnel frequently. Actually, if adopts the certain design and the construction measure, very many cracks are may overcome and control. In order to further strengthens to the concrete bridge crack understanding, avoids in the project appearing the harm big crack as far as possible, this article the reason which and produces to the concrete bridge crack type makes the comprehensive analysis, the summary as far as possible, by facilitates the design, the construction discovers the control crack the feasible means, achieves the guard in not however function .
L concrete bridge crack type, origin
In fact, the concrete structural cracks origin is complex and there are many kinds of factors, even they affect it mutually, but each crack has it to have one kind of or several kind of main reasons. The concrete bridge crack type,as the reason it produced, may pide the following several kinds approximately:
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