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Lightweight aggregate concrete has light weight, good thermal performance, and many other advantages of new building materials, it has been widely used in foreign countries, and achieved good economic and technical benefits. In our country, as the research and application of the structural is also relatively backward. This experiment adopts LC20 LC30 and the strength of the two kinds of test beam, respectively, respectively, in accordance with 15%, 20%, 25% of the amplitude modulation coefficient to calculate reinforcement. Use two span continuous beam, such as grading load and concentrated load mode, through the determination of bearing reaction force, deflection and stress of reinforced concrete strain of the section, and the main draw the following conclusions: 1, ceramsite concrete continuous beam can achieve full internal force redistribution of the amplitude modulation coefficient to determine the main controlling crack width limit conditions, the upper limit amplitude modulation coefficient is 20%. 2, ceramsite concrete in front of the crack material performance conforms to the law of elasticity, according to the elastic theory analysis and practical results better.
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