本文選題：橋梁工程 + 熱應力�。� 參考：《公路交通科技》2017年12期

【摘要】：為解決環(huán)氧樹脂-混凝土疊合結構在溫度變化時因兩種材料變形不協(xié)調而造成結構破壞的問題,進行了環(huán)氧樹脂-混凝土疊合結構的熱應力研究,對結構在環(huán)氧樹脂固化階段、養(yǎng)護階段、后固化階段和使用階段進行應力分析,提出各階段環(huán)氧樹脂中存在的熱應力有收縮應力、固化應力、后固化應力和溫度應力,給出了這些應力的計算公式,并進行了有限元計算和試驗驗證,結果表明:(1)從環(huán)氧樹脂澆注到混凝土上那一刻開始,就會由于樹脂的固化反應、以及溫度的變化而在體系內部產生應力,主要包含收縮應力、固化應力、后固化應力、溫度應力;(2)較小的彈性模量能有效降低環(huán)氧樹脂-混凝土疊合結構的固化應力、后固化應力和溫度應力,但常溫下表現為低彈性模量的環(huán)氧樹脂在低溫時其彈性模量會急劇上升,有時會增加幾十倍,大大增加了低溫時的溫度應力;(3)常溫養(yǎng)護時,高溫后固化的環(huán)氧樹脂-混凝土疊合結構的內應力變化比較復雜,因高溫后固化會降低環(huán)氧樹脂的線性熱膨脹系數,增加其彈性模量以及熱變形溫度,同時也會產生固化收縮,最終應力累積的計算需要大量試驗數據;(4)環(huán)氧樹脂最大平均彈性模量為131.9 MPa(20℃至-20℃的平均彈性模量,環(huán)氧樹脂線脹系數取100×10~(-6)(m·m~(-1))/℃)時,可通過ASTM C884中相容性試驗測試。
[Abstract]:In order to solve the problem of structure failure caused by the deformation of two kinds of materials when the temperature change of epoxy resin concrete composite structure, the thermal stress of epoxy resin concrete composite structure was studied, and the structure was cured by epoxy resin. The stress analysis of curing stage, post curing stage and application stage is carried out, and the thermal stress in each stage of epoxy resin is put forward, such as shrinkage stress, solidification stress, post solidification stress and temperature stress, and the calculation formula of these stresses is given. The finite element calculation and test results show that: (1) from the moment of epoxy resin pouring to concrete, the curing reaction of resin and the change of temperature will produce stress in the system, which mainly includes shrinkage stress. Curing stress, post curing stress and temperature stress. (2) the curing stress, post curing stress and temperature stress of epoxy resin concrete composite structure can be effectively reduced by small elastic modulus. At room temperature, however, the elastic modulus of epoxy resin with low modulus of elasticity increases sharply at low temperature, and sometimes increases by dozens of times, which greatly increases the thermal stress at low temperature. (3) when curing at room temperature, The internal stress changes of epoxy resin / concrete composite structure cured after high temperature are more complicated, because curing after high temperature will reduce the linear thermal expansion coefficient of epoxy resin, increase its elastic modulus and thermal deformation temperature, at the same time, it will produce curing shrinkage. (4) when the maximum average elastic modulus of epoxy resin is 131.9 MPA (from 20 鈩，

本文編號：2092124