基于名义拉应力法的预应力混凝土矩形截面的裂缝控制

文章根据现行规范的裂缝宽度的计算公式,自编了计算程序,计算出了有粘结和无粘结部分预应力混凝土结构的对应于特征裂缝宽度的名义拉应力值,并考虑各种不同的参数对一定裂缝宽度下名义拉应力值的影响,归纳出了各参数的影响系数。对于综合的影响系数,可以通过将各影响系数相乘而得到,进而得到一种简便、可靠的验算方法。

The Crack Control of Prestressed Concrete Rectangular Section Based on Nominal-Tensile-Stress Method

Based on the formula of the crack width in the present code, a program was complied to calculate the nominal tensile stress corresponding to the characteristic of crack width for the bonded and unbonded partially prestressed concrete structures. In the calculation, different parameters were considered to study their in- fluence on the value of the characteristic tensile stress corresponding to a specific crack width, and the coeffi- cients of different parameters were also summerized. As a result, the overall coefficient can be obtained by multiplying the coefficients for different parameters. Then, a simple and credible computation methods was established based on the calculation of nominal tensile stress.