- 摘 要
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（中國建筑技術集團有限公司， 北京 100013）
［摘要］西寧海湖新區(qū)財富天街項目商業(yè)C3段地上結構平面尺寸大于規(guī)范規(guī)定的現(xiàn)澆鋼筋混凝土框架結構設置伸縮縫的最大間距，通過計算以及裂縫控制措施來分析商業(yè)C3段結構超長不設縫是可行的。采用PMSAP軟件，進行升溫30℃和降溫30℃兩種工況的應力分析，控制混凝土X向與Y向的平均拉應力均不超過混凝土抗拉強度標準值；根據(jù)應力分析結果，對樓板進行加厚、雙層雙向拉通配筋、提高樓板配筋率；適當提高梁的縱筋配筋率，所有梁的腰筋直徑加大一級，保證梁受拉不開裂。采用粉煤灰混凝土，嚴格控制水灰比在0.50以下，減少水泥用量和用水量，降低水化熱和收縮變形；在普通混凝土內滲入水泥用量10％～12％的UEA、HEA等類似膨脹劑，減輕混凝土的開裂。要求施工單位認真做好混凝土的養(yǎng)護，采取有效措施，確?；炷猎跐駶櫟臈l件下硬化；加強澆水養(yǎng)護，澆水養(yǎng)護時間宜在14d以上。
［關鍵詞］平面結構超長； 溫差效應； 裂縫控制
中圖分類號： TU318 文獻標識碼： A文章編號： 1002-848X(2016)S2-0107-04
Design and research on C3 building of Xining Haihu New District Fortune Plaza Project
plane overlength structure
Li Wenhua, Gong Xin
(China Building Technique Group Co., Ltd., Beijing 100013, China)
Abstract: Xining Haihu New District Fortune Plaza Project commercial C3 building was an overlong concrete structure. The structural plane dimension exceeded the maximum size of code requirement, which the plane dimension of cast-in-situ reinforced concrete frame structure should set expansion and contraction joint. Commercial C3 building without the joint is feasible by calculation analysis and crack control measures. A brief description is given on design of overlength structure measure. PMSAP software was adopted to make stress analysis of two operating condition on heating 30℃ and cooling 30℃, average tensile stress of concrete in X and Y direction were controlled not to exceed the value of characteristic value of concrete tensile strength. According to the result, pointed thickening of slab, spreading reinforcement in both two layers and two ways and increasing ratio of reinforcement should be made in slab. In order to ensure no cracks when tension force act on the beam, ratio of longitudinal reinforcement of beam should be increased and diameter of side bar of all the beam be add a level. Fly ash concrete is adopted, water/cement ratio is strictly controlled not to exceed 0.5, decrease cement and water content, and reduce heat of hydration and shrinkage deformation. In order to reduce cracking, expansive admixture as UEA, HEA with a dosage of 10%~12% of cement content. Construction units are requested to do a well concrete maintenance, effective measures should be adopted for concrete hardening under humid conditions; strengthen water curing and time of water curing should be above 14 days.
Keywords: plane overlength structure; temperature variation effect; crack control
作者簡介：李文華，工程師，Email:aituzi125@163.com。
