一、前言近年来施工的一些钢筋混凝土工程出现了一些温度裂缝,这种裂缝大致可分为二类。一类裂缝间距很小,一般30cm左右,缝宽较小似不贯通,如三元立交桥的主梁裂缝,北窑桥的引桥T梁裂缝。另一类裂缝间距较大,一般3～4m以上,缝宽较大贯通,这类裂缝过去多见如矩形水池侧墙裂缝,盖板河侧墙裂缝等,近期有马甸立交桥桥台裂缝, I. INTRODUCTION Some of the reinforced concrete projects under construction in recent years have experienced some temperature cracks. Such cracks can be roughly classified into two categories. One kind of crack spacing is very small, generally about 30cm, the seam width is smaller like does not penetrate, such as the three-way overpass main beam cracks, the Beiyaoqiao bridge T-beam cracks. Another type of crack has a large gap, generally 3 to 4m or more, and the slit width is relatively large. Such cracks have been seen in the past, such as the cracks in the side walls of rectangular pools, and cracks in the side walls of covered rivers, etc. Recently, there are cracks in the overpasses of Madian overpasses.