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預(yù)應(yīng)力混凝土疊合受彎構(gòu)件剛度評(píng)價(jià)及撓度計(jì)算
尚自端 呂志鋒 王秀格
摘 要

(北京科技大學(xué)土木與環(huán)境工程學(xué)院 100083)
【提要】 分析了二次受力情況下預(yù)應(yīng)力混凝土疊合構(gòu)件斷面的受力特點(diǎn),探討了其剛度的評(píng)價(jià)方法和撓度計(jì)算方法。在正常使用狀態(tài)下,由于預(yù)制斷面上荷載預(yù)應(yīng)力的存在,增大了斷面的有效受壓區(qū)面積,從而提高了疊合構(gòu)件的初期抗彎剛度。給出的撓度計(jì)算方法合理地解決了二次受力疊合構(gòu)件的撓度計(jì)算問題,其計(jì)算結(jié)
果與試驗(yàn)結(jié)果吻合較好。
【關(guān)鍵詞】預(yù)應(yīng)力混凝土 疊合構(gòu)件 二次受力 荷載預(yù)應(yīng)力 應(yīng)變剛性 撓度
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

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