(北京科技大学土木与环境工程学院 100083)
【提要】 分析了二次受力情况下预应力混凝土叠合构件断面的受力特点，探讨了其刚度的评价方法和挠度计算方法。在正常使用状态下，由于预制断面上荷载预应力的存在，增大了断面的有效受压区面积，从而提高了叠合构件的初期抗弯刚度。给出的挠度计算方法合理地解决了二次受力叠合构件的挠度计算问题，其计算结
果与试验结果吻合较好。
【关键词】预应力混凝土 叠合构件 二次受力 荷载预应力 应变刚性 挠度
Investigation of Stiffness Evaluation and Deflection Calculation of Precast Partially Prestressed Concrete Composite(PCaPPC) Members/Shang Ziduan,Lü Zhifeng,Wang Xiuge(School of Civil and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China)
Abstract:The stress characteristic of precast partially prestressed concrete composite(PCaPPC) member section under the secondary force situation is analyzed and the stiffness evaluation and deflection calculation are discussed.Because of the existence of prestress, the compressive region is enlarged and the primary bending stiffness is developed.The deflection calculation method is presented which can solve the secondary force problem of PCaPPC members.The caculating results agree well with the test results.
Keywords:precast partially prestressed composite members;historically loaded;residual stress;strain;stiffness;deflection