- 摘 要
-
（中國建筑第八工程局有限公司工程研究院， 上海 200122）
［摘要］通過600MPa級熱軋帶肋高強鋼筋混凝土受彎構件試驗，對GB 50010—2010中關于混凝土受彎構件裂縫寬度計算的相關參數(shù)提出修正建議。經(jīng)分析，建議短期裂縫寬度的擴大系數(shù)τs取為1.58，反映裂縫間混凝土伸長對裂縫寬度影響的系數(shù)αc取為0.73，在計算受彎構件裂縫間縱向受拉鋼筋應變不均勻系數(shù)時，參數(shù)ω1取為1。根據(jù)試驗結果提出了裂縫寬度的修正建議，修正后的裂縫寬度計算公式不僅具有95%保證率，且與實測值的吻合度優(yōu)于中、美、歐規(guī)范中的裂縫寬度計算公式。
［關鍵詞］高強鋼筋； 受彎構件； 裂縫寬度計算參數(shù)
中圖分類號：TU375文獻標識碼：A文章編號：1002-848X(2020)13-0018-06
Parameter analysis and experimental study on crack width of flexural members with high-strength steel bars
XIONG Hao, GE Jie
(Engineering Research Institute, China Construction Eighth Engineering Division Co., Ltd., Shanghai 200122, China)
Abstract:Based on the test of 600MPa hot rolled ribbed high-strength reinforced concrete flexural members, some correction suggestions were put forward for the relevant parameters in GB 50010—2010 on the calculation of crack width of concrete flexural members. After analysis, it is suggested that the expansion coefficient τs of short-term crack width is 1-58, the coefficient αc reflecting the influence of concrete elongation between cracks on crack width is 0.73, and the parameter ω1 is 1 when calculating the strain nonuniformity coefficient of longitudinal tensile reinforcement between cracks of flexural members. According to the test results, the crack width formula was modified. The modified crack width formula not only has 95% assurance rate, but also has better agreement with the measured value than the crack width formula in Chinese, American and European codes.
Keywords:high-strength steel bar; flexural member; calculation parameter of crack-width
作者簡介：熊浩，碩士，工程師，一級建造師，Email:tj_xionghao@163.com。
