混凝土长墙裂缝宽度计算方法的研究

Study on calculation method of crack width of concrete long wall

混凝土长墙的开裂现象较为普遍,裂缝控制难度大。对混凝土长墙的裂缝计算方法作进一步的研究是很有意义的。在王铁梦提出的弹性地基上的混凝土长墙模型的基础上采用约束位移方法推导裂缝宽度计算公式,并分析了混凝土长墙的开裂性与裂缝宽度的关系。通过理论分析和工程案例,对裂缝宽度计算的实际位移方法、约束位移方法进行了对比分析。分析结果表明,实际位移方法经过衰减系数修正得到的裂缝宽度计算结果可以较接近实测结果,但实际位移方法选取衰减系数存在人为因素,计算结果具有不确定性;约束位移方法符合混凝土长墙开裂性与裂缝宽度的关系的客观规律,能够直接得到较接近实测结果的裂缝宽度计算结果,更加适合在裂缝控制工程中应用。

Cracking phenomenon of a concrete long wall is common,and crack control is difficult.It is meaningful to further study the crack calculation method of the concrete long wall.On the basis of Wang Tiemeng model of the concrete long wall on elastic foundation,the calculation formula of crack width was derived by using the constrained displacement method,and the relationship between cracking and crack width of the concrete long wall was analyzed.Through theoretical analysis and engineering cases,actual displacement method and constrained displacement method for calculating crack width were compared and analyzed.The analysis results show that the crack width calculation results obtained by actual displacement method after attenuation coefficient correction can be closer to the measured results,but there are artificial factors in selecting the attenuation coefficient by actual displacement method,and the calculation results are uncertain.The constrained displacement method accords with the objective law of the relationship between the cracking and the crack width of the concrete long wall,which can directly obtain the crack width calculation results close to the measured results,which is more suitable for application in crack control engineering.